ilkay KOZAK
V148
Fork of
RadioHead-148
by 
David Rimer
Diff: RH_RF22.h
- Revision:
- 0:ab4e012489ef
diff -r 000000000000 -r ab4e012489ef RH_RF22.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/RH_RF22.h Thu Oct 15 01:27:00 2015 +0000
@@ -0,0 +1,1269 @@
+// RH_RF22.h
+// Author: Mike McCauley (mikem@airspayce.com)
+// Copyright (C) 2011 Mike McCauley
+// $Id: RH_RF22.h,v 1.27 2015/05/17 00:11:26 mikem Exp $
+//
+
+#ifndef RH_RF22_h
+#define RH_RF22_h
+
+#include <RHGenericSPI.h>
+#include <RHSPIDriver.h>
+
+// This is the maximum number of interrupts the library can support
+// Most Arduinos can handle 2, Megas can handle more
+#define RH_RF22_NUM_INTERRUPTS 3
+
+// This is the bit in the SPI address that marks it as a write
+#define RH_RF22_SPI_WRITE_MASK 0x80
+
+// This is the maximum message length that can be supported by this library. Limited by
+// the single message length octet in the header.
+// Yes, 255 is correct even though the FIFO size in the RF22 is only
+// 64 octets. We use interrupts to refill the Tx FIFO during transmission and to empty the
+// Rx FIFO during reception
+// Can be pre-defined to a smaller size (to save SRAM) prior to including this header
+#ifndef RH_RF22_MAX_MESSAGE_LEN
+//#define RH_RF22_MAX_MESSAGE_LEN 255
+#define RH_RF22_MAX_MESSAGE_LEN 50
+#endif
+
+// Max number of octets the RF22 Rx and Tx FIFOs can hold
+#define RH_RF22_FIFO_SIZE 64
+
+// These values we set for FIFO thresholds (4, 55) are actually the same as the POR values
+#define RH_RF22_TXFFAEM_THRESHOLD 4
+#define RH_RF22_RXFFAFULL_THRESHOLD 55
+
+// Number of registers to be passed to setModemConfig(). Obsolete.
+#define RH_RF22_NUM_MODEM_CONFIG_REGS 18
+
+// Register names
+#define RH_RF22_REG_00_DEVICE_TYPE 0x00
+#define RH_RF22_REG_01_VERSION_CODE 0x01
+#define RH_RF22_REG_02_DEVICE_STATUS 0x02
+#define RH_RF22_REG_03_INTERRUPT_STATUS1 0x03
+#define RH_RF22_REG_04_INTERRUPT_STATUS2 0x04
+#define RH_RF22_REG_05_INTERRUPT_ENABLE1 0x05
+#define RH_RF22_REG_06_INTERRUPT_ENABLE2 0x06
+#define RH_RF22_REG_07_OPERATING_MODE1 0x07
+#define RH_RF22_REG_08_OPERATING_MODE2 0x08
+#define RH_RF22_REG_09_OSCILLATOR_LOAD_CAPACITANCE 0x09
+#define RH_RF22_REG_0A_UC_OUTPUT_CLOCK 0x0a
+#define RH_RF22_REG_0B_GPIO_CONFIGURATION0 0x0b
+#define RH_RF22_REG_0C_GPIO_CONFIGURATION1 0x0c
+#define RH_RF22_REG_0D_GPIO_CONFIGURATION2 0x0d
+#define RH_RF22_REG_0E_IO_PORT_CONFIGURATION 0x0e
+#define RH_RF22_REG_0F_ADC_CONFIGURATION 0x0f
+#define RH_RF22_REG_10_ADC_SENSOR_AMP_OFFSET 0x10
+#define RH_RF22_REG_11_ADC_VALUE 0x11
+#define RH_RF22_REG_12_TEMPERATURE_SENSOR_CALIBRATION 0x12
+#define RH_RF22_REG_13_TEMPERATURE_VALUE_OFFSET 0x13
+#define RH_RF22_REG_14_WAKEUP_TIMER_PERIOD1 0x14
+#define RH_RF22_REG_15_WAKEUP_TIMER_PERIOD2 0x15
+#define RH_RF22_REG_16_WAKEUP_TIMER_PERIOD3 0x16
+#define RH_RF22_REG_17_WAKEUP_TIMER_VALUE1 0x17
+#define RH_RF22_REG_18_WAKEUP_TIMER_VALUE2 0x18
+#define RH_RF22_REG_19_LDC_MODE_DURATION 0x19
+#define RH_RF22_REG_1A_LOW_BATTERY_DETECTOR_THRESHOLD 0x1a
+#define RH_RF22_REG_1B_BATTERY_VOLTAGE_LEVEL 0x1b
+#define RH_RF22_REG_1C_IF_FILTER_BANDWIDTH 0x1c
+#define RH_RF22_REG_1D_AFC_LOOP_GEARSHIFT_OVERRIDE 0x1d
+#define RH_RF22_REG_1E_AFC_TIMING_CONTROL 0x1e
+#define RH_RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE 0x1f
+#define RH_RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE 0x20
+#define RH_RF22_REG_21_CLOCK_RECOVERY_OFFSET2 0x21
+#define RH_RF22_REG_22_CLOCK_RECOVERY_OFFSET1 0x22
+#define RH_RF22_REG_23_CLOCK_RECOVERY_OFFSET0 0x23
+#define RH_RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1 0x24
+#define RH_RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0 0x25
+#define RH_RF22_REG_26_RSSI 0x26
+#define RH_RF22_REG_27_RSSI_THRESHOLD 0x27
+#define RH_RF22_REG_28_ANTENNA_DIVERSITY1 0x28
+#define RH_RF22_REG_29_ANTENNA_DIVERSITY2 0x29
+#define RH_RF22_REG_2A_AFC_LIMITER 0x2a
+#define RH_RF22_REG_2B_AFC_CORRECTION_READ 0x2b
+#define RH_RF22_REG_2C_OOK_COUNTER_VALUE_1 0x2c
+#define RH_RF22_REG_2D_OOK_COUNTER_VALUE_2 0x2d
+#define RH_RF22_REG_2E_SLICER_PEAK_HOLD 0x2e
+#define RH_RF22_REG_30_DATA_ACCESS_CONTROL 0x30
+#define RH_RF22_REG_31_EZMAC_STATUS 0x31
+#define RH_RF22_REG_32_HEADER_CONTROL1 0x32
+#define RH_RF22_REG_33_HEADER_CONTROL2 0x33
+#define RH_RF22_REG_34_PREAMBLE_LENGTH 0x34
+#define RH_RF22_REG_35_PREAMBLE_DETECTION_CONTROL1 0x35
+#define RH_RF22_REG_36_SYNC_WORD3 0x36
+#define RH_RF22_REG_37_SYNC_WORD2 0x37
+#define RH_RF22_REG_38_SYNC_WORD1 0x38
+#define RH_RF22_REG_39_SYNC_WORD0 0x39
+#define RH_RF22_REG_3A_TRANSMIT_HEADER3 0x3a
+#define RH_RF22_REG_3B_TRANSMIT_HEADER2 0x3b
+#define RH_RF22_REG_3C_TRANSMIT_HEADER1 0x3c
+#define RH_RF22_REG_3D_TRANSMIT_HEADER0 0x3d
+#define RH_RF22_REG_3E_PACKET_LENGTH 0x3e
+#define RH_RF22_REG_3F_CHECK_HEADER3 0x3f
+#define RH_RF22_REG_40_CHECK_HEADER2 0x40
+#define RH_RF22_REG_41_CHECK_HEADER1 0x41
+#define RH_RF22_REG_42_CHECK_HEADER0 0x42
+#define RH_RF22_REG_43_HEADER_ENABLE3 0x43
+#define RH_RF22_REG_44_HEADER_ENABLE2 0x44
+#define RH_RF22_REG_45_HEADER_ENABLE1 0x45
+#define RH_RF22_REG_46_HEADER_ENABLE0 0x46
+#define RH_RF22_REG_47_RECEIVED_HEADER3 0x47
+#define RH_RF22_REG_48_RECEIVED_HEADER2 0x48
+#define RH_RF22_REG_49_RECEIVED_HEADER1 0x49
+#define RH_RF22_REG_4A_RECEIVED_HEADER0 0x4a
+#define RH_RF22_REG_4B_RECEIVED_PACKET_LENGTH 0x4b
+#define RH_RF22_REG_50_ANALOG_TEST_BUS_SELECT 0x50
+#define RH_RF22_REG_51_DIGITAL_TEST_BUS_SELECT 0x51
+#define RH_RF22_REG_52_TX_RAMP_CONTROL 0x52
+#define RH_RF22_REG_53_PLL_TUNE_TIME 0x53
+#define RH_RF22_REG_55_CALIBRATION_CONTROL 0x55
+#define RH_RF22_REG_56_MODEM_TEST 0x56
+#define RH_RF22_REG_57_CHARGE_PUMP_TEST 0x57
+#define RH_RF22_REG_58_CHARGE_PUMP_CURRENT_TRIMMING 0x58
+#define RH_RF22_REG_59_DIVIDER_CURRENT_TRIMMING 0x59
+#define RH_RF22_REG_5A_VCO_CURRENT_TRIMMING 0x5a
+#define RH_RF22_REG_5B_VCO_CALIBRATION 0x5b
+#define RH_RF22_REG_5C_SYNTHESIZER_TEST 0x5c
+#define RH_RF22_REG_5D_BLOCK_ENABLE_OVERRIDE1 0x5d
+#define RH_RF22_REG_5E_BLOCK_ENABLE_OVERRIDE2 0x5e
+#define RH_RF22_REG_5F_BLOCK_ENABLE_OVERRIDE3 0x5f
+#define RH_RF22_REG_60_CHANNEL_FILTER_COEFFICIENT_ADDRESS 0x60
+#define RH_RF22_REG_61_CHANNEL_FILTER_COEFFICIENT_VALUE 0x61
+#define RH_RF22_REG_62_CRYSTAL_OSCILLATOR_POR_CONTROL 0x62
+#define RH_RF22_REG_63_RC_OSCILLATOR_COARSE_CALIBRATION 0x63
+#define RH_RF22_REG_64_RC_OSCILLATOR_FINE_CALIBRATION 0x64
+#define RH_RF22_REG_65_LDO_CONTROL_OVERRIDE 0x65
+#define RH_RF22_REG_66_LDO_LEVEL_SETTINGS 0x66
+#define RH_RF22_REG_67_DELTA_SIGMA_ADC_TUNING1 0x67
+#define RH_RF22_REG_68_DELTA_SIGMA_ADC_TUNING2 0x68
+#define RH_RF22_REG_69_AGC_OVERRIDE1 0x69
+#define RH_RF22_REG_6A_AGC_OVERRIDE2 0x6a
+#define RH_RF22_REG_6B_GFSK_FIR_FILTER_COEFFICIENT_ADDRESS 0x6b
+#define RH_RF22_REG_6C_GFSK_FIR_FILTER_COEFFICIENT_VALUE 0x6c
+#define RH_RF22_REG_6D_TX_POWER 0x6d
+#define RH_RF22_REG_6E_TX_DATA_RATE1 0x6e
+#define RH_RF22_REG_6F_TX_DATA_RATE0 0x6f
+#define RH_RF22_REG_70_MODULATION_CONTROL1 0x70
+#define RH_RF22_REG_71_MODULATION_CONTROL2 0x71
+#define RH_RF22_REG_72_FREQUENCY_DEVIATION 0x72
+#define RH_RF22_REG_73_FREQUENCY_OFFSET1 0x73
+#define RH_RF22_REG_74_FREQUENCY_OFFSET2 0x74
+#define RH_RF22_REG_75_FREQUENCY_BAND_SELECT 0x75
+#define RH_RF22_REG_76_NOMINAL_CARRIER_FREQUENCY1 0x76
+#define RH_RF22_REG_77_NOMINAL_CARRIER_FREQUENCY0 0x77
+#define RH_RF22_REG_79_FREQUENCY_HOPPING_CHANNEL_SELECT 0x79
+#define RH_RF22_REG_7A_FREQUENCY_HOPPING_STEP_SIZE 0x7a
+#define RH_RF22_REG_7C_TX_FIFO_CONTROL1 0x7c
+#define RH_RF22_REG_7D_TX_FIFO_CONTROL2 0x7d
+#define RH_RF22_REG_7E_RX_FIFO_CONTROL 0x7e
+#define RH_RF22_REG_7F_FIFO_ACCESS 0x7f
+
+// These register masks etc are named wherever possible
+// corresponding to the bit and field names in the RF-22 Manual
+// RH_RF22_REG_00_DEVICE_TYPE 0x00
+#define RH_RF22_DEVICE_TYPE_RX_TRX 0x08
+#define RH_RF22_DEVICE_TYPE_TX 0x07
+
+// RH_RF22_REG_02_DEVICE_STATUS 0x02
+#define RH_RF22_FFOVL 0x80
+#define RH_RF22_FFUNFL 0x40
+#define RH_RF22_RXFFEM 0x20
+#define RH_RF22_HEADERR 0x10
+#define RH_RF22_FREQERR 0x08
+#define RH_RF22_LOCKDET 0x04
+#define RH_RF22_CPS 0x03
+#define RH_RF22_CPS_IDLE 0x00
+#define RH_RF22_CPS_RX 0x01
+#define RH_RF22_CPS_TX 0x10
+
+// RH_RF22_REG_03_INTERRUPT_STATUS1 0x03
+#define RH_RF22_IFFERROR 0x80
+#define RH_RF22_ITXFFAFULL 0x40
+#define RH_RF22_ITXFFAEM 0x20
+#define RH_RF22_IRXFFAFULL 0x10
+#define RH_RF22_IEXT 0x08
+#define RH_RF22_IPKSENT 0x04
+#define RH_RF22_IPKVALID 0x02
+#define RH_RF22_ICRCERROR 0x01
+
+// RH_RF22_REG_04_INTERRUPT_STATUS2 0x04
+#define RH_RF22_ISWDET 0x80
+#define RH_RF22_IPREAVAL 0x40
+#define RH_RF22_IPREAINVAL 0x20
+#define RH_RF22_IRSSI 0x10
+#define RH_RF22_IWUT 0x08
+#define RH_RF22_ILBD 0x04
+#define RH_RF22_ICHIPRDY 0x02
+#define RH_RF22_IPOR 0x01
+
+// RH_RF22_REG_05_INTERRUPT_ENABLE1 0x05
+#define RH_RF22_ENFFERR 0x80
+#define RH_RF22_ENTXFFAFULL 0x40
+#define RH_RF22_ENTXFFAEM 0x20
+#define RH_RF22_ENRXFFAFULL 0x10
+#define RH_RF22_ENEXT 0x08
+#define RH_RF22_ENPKSENT 0x04
+#define RH_RF22_ENPKVALID 0x02
+#define RH_RF22_ENCRCERROR 0x01
+
+// RH_RF22_REG_06_INTERRUPT_ENABLE2 0x06
+#define RH_RF22_ENSWDET 0x80
+#define RH_RF22_ENPREAVAL 0x40
+#define RH_RF22_ENPREAINVAL 0x20
+#define RH_RF22_ENRSSI 0x10
+#define RH_RF22_ENWUT 0x08
+#define RH_RF22_ENLBDI 0x04
+#define RH_RF22_ENCHIPRDY 0x02
+#define RH_RF22_ENPOR 0x01
+
+// RH_RF22_REG_07_OPERATING_MODE 0x07
+#define RH_RF22_SWRES 0x80
+#define RH_RF22_ENLBD 0x40
+#define RH_RF22_ENWT 0x20
+#define RH_RF22_X32KSEL 0x10
+#define RH_RF22_TXON 0x08
+#define RH_RF22_RXON 0x04
+#define RH_RF22_PLLON 0x02
+#define RH_RF22_XTON 0x01
+
+// RH_RF22_REG_08_OPERATING_MODE2 0x08
+#define RH_RF22_ANTDIV 0xc0
+#define RH_RF22_RXMPK 0x10
+#define RH_RF22_AUTOTX 0x08
+#define RH_RF22_ENLDM 0x04
+#define RH_RF22_FFCLRRX 0x02
+#define RH_RF22_FFCLRTX 0x01
+
+// RH_RF22_REG_0F_ADC_CONFIGURATION 0x0f
+#define RH_RF22_ADCSTART 0x80
+#define RH_RF22_ADCDONE 0x80
+#define RH_RF22_ADCSEL 0x70
+#define RH_RF22_ADCSEL_INTERNAL_TEMPERATURE_SENSOR 0x00
+#define RH_RF22_ADCSEL_GPIO0_SINGLE_ENDED 0x10
+#define RH_RF22_ADCSEL_GPIO1_SINGLE_ENDED 0x20
+#define RH_RF22_ADCSEL_GPIO2_SINGLE_ENDED 0x30
+#define RH_RF22_ADCSEL_GPIO0_GPIO1_DIFFERENTIAL 0x40
+#define RH_RF22_ADCSEL_GPIO1_GPIO2_DIFFERENTIAL 0x50
+#define RH_RF22_ADCSEL_GPIO0_GPIO2_DIFFERENTIAL 0x60
+#define RH_RF22_ADCSEL_GND 0x70
+#define RH_RF22_ADCREF 0x0c
+#define RH_RF22_ADCREF_BANDGAP_VOLTAGE 0x00
+#define RH_RF22_ADCREF_VDD_ON_3 0x08
+#define RH_RF22_ADCREF_VDD_ON_2 0x0c
+#define RH_RF22_ADCGAIN 0x03
+
+// RH_RF22_REG_10_ADC_SENSOR_AMP_OFFSET 0x10
+#define RH_RF22_ADCOFFS 0x0f
+
+// RH_RF22_REG_12_TEMPERATURE_SENSOR_CALIBRATION 0x12
+#define RH_RF22_TSRANGE 0xc0
+#define RH_RF22_TSRANGE_M64_64C 0x00
+#define RH_RF22_TSRANGE_M64_192C 0x40
+#define RH_RF22_TSRANGE_0_128C 0x80
+#define RH_RF22_TSRANGE_M40_216F 0xc0
+#define RH_RF22_ENTSOFFS 0x20
+#define RH_RF22_ENTSTRIM 0x10
+#define RH_RF22_TSTRIM 0x0f
+
+// RH_RF22_REG_14_WAKEUP_TIMER_PERIOD1 0x14
+#define RH_RF22_WTR 0x3c
+#define RH_RF22_WTD 0x03
+
+// RH_RF22_REG_1D_AFC_LOOP_GEARSHIFT_OVERRIDE 0x1d
+#define RH_RF22_AFBCD 0x80
+#define RH_RF22_ENAFC 0x40
+#define RH_RF22_AFCGEARH 0x38
+#define RH_RF22_AFCGEARL 0x07
+
+// RH_RF22_REG_1E_AFC_TIMING_CONTROL 0x1e
+#define RH_RF22_SWAIT_TIMER 0xc0
+#define RH_RF22_SHWAIT 0x38
+#define RH_RF22_ANWAIT 0x07
+
+// RH_RF22_REG_30_DATA_ACCESS_CONTROL 0x30
+#define RH_RF22_ENPACRX 0x80
+#define RH_RF22_MSBFRST 0x00
+#define RH_RF22_LSBFRST 0x40
+#define RH_RF22_CRCHDRS 0x00
+#define RH_RF22_CRCDONLY 0x20
+#define RH_RF22_SKIP2PH 0x10
+#define RH_RF22_ENPACTX 0x08
+#define RH_RF22_ENCRC 0x04
+#define RH_RF22_CRC 0x03
+#define RH_RF22_CRC_CCITT 0x00
+#define RH_RF22_CRC_CRC_16_IBM 0x01
+#define RH_RF22_CRC_IEC_16 0x02
+#define RH_RF22_CRC_BIACHEVA 0x03
+
+// RH_RF22_REG_32_HEADER_CONTROL1 0x32
+#define RH_RF22_BCEN 0xf0
+#define RH_RF22_BCEN_NONE 0x00
+#define RH_RF22_BCEN_HEADER0 0x10
+#define RH_RF22_BCEN_HEADER1 0x20
+#define RH_RF22_BCEN_HEADER2 0x40
+#define RH_RF22_BCEN_HEADER3 0x80
+#define RH_RF22_HDCH 0x0f
+#define RH_RF22_HDCH_NONE 0x00
+#define RH_RF22_HDCH_HEADER0 0x01
+#define RH_RF22_HDCH_HEADER1 0x02
+#define RH_RF22_HDCH_HEADER2 0x04
+#define RH_RF22_HDCH_HEADER3 0x08
+
+// RH_RF22_REG_33_HEADER_CONTROL2 0x33
+#define RH_RF22_HDLEN 0x70
+#define RH_RF22_HDLEN_0 0x00
+#define RH_RF22_HDLEN_1 0x10
+#define RH_RF22_HDLEN_2 0x20
+#define RH_RF22_HDLEN_3 0x30
+#define RH_RF22_HDLEN_4 0x40
+#define RH_RF22_VARPKLEN 0x00
+#define RH_RF22_FIXPKLEN 0x08
+#define RH_RF22_SYNCLEN 0x06
+#define RH_RF22_SYNCLEN_1 0x00
+#define RH_RF22_SYNCLEN_2 0x02
+#define RH_RF22_SYNCLEN_3 0x04
+#define RH_RF22_SYNCLEN_4 0x06
+#define RH_RF22_PREALEN8 0x01
+
+// RH_RF22_REG_6D_TX_POWER 0x6d
+// https://www.sparkfun.com/datasheets/Wireless/General/RFM22B.pdf
+#define RH_RF22_PAPEAKVAL 0x80
+#define RH_RF22_PAPEAKEN 0x40
+#define RH_RF22_PAPEAKLVL 0x30
+#define RH_RF22_PAPEAKLVL6_5 0x00
+#define RH_RF22_PAPEAKLVL7 0x10
+#define RH_RF22_PAPEAKLVL7_5 0x20
+#define RH_RF22_PAPEAKLVL8 0x30
+#define RH_RF22_LNA_SW 0x08
+#define RH_RF22_TXPOW 0x07
+#define RH_RF22_TXPOW_4X31 0x08 // Not used in RFM22B
+// For RFM22B:
+#define RH_RF22_TXPOW_1DBM 0x00
+#define RH_RF22_TXPOW_2DBM 0x01
+#define RH_RF22_TXPOW_5DBM 0x02
+#define RH_RF22_TXPOW_8DBM 0x03
+#define RH_RF22_TXPOW_11DBM 0x04
+#define RH_RF22_TXPOW_14DBM 0x05
+#define RH_RF22_TXPOW_17DBM 0x06
+#define RH_RF22_TXPOW_20DBM 0x07
+// RFM23B only:
+#define RH_RF22_RF23B_TXPOW_M8DBM 0x00 // -8dBm
+#define RH_RF22_RF23B_TXPOW_M5DBM 0x01 // -5dBm
+#define RH_RF22_RF23B_TXPOW_M2DBM 0x02 // -2dBm
+#define RH_RF22_RF23B_TXPOW_1DBM 0x03 // 1dBm
+#define RH_RF22_RF23B_TXPOW_4DBM 0x04 // 4dBm
+#define RH_RF22_RF23B_TXPOW_7DBM 0x05 // 7dBm
+#define RH_RF22_RF23B_TXPOW_10DBM 0x06 // 10dBm
+#define RH_RF22_RF23B_TXPOW_13DBM 0x07 // 13dBm
+// RFM23BP only:
+#define RH_RF22_RF23BP_TXPOW_28DBM 0x05 // 28dBm
+#define RH_RF22_RF23BP_TXPOW_29DBM 0x06 // 29dBm
+#define RH_RF22_RF23BP_TXPOW_30DBM 0x07 // 30dBm
+
+// RH_RF22_REG_71_MODULATION_CONTROL2 0x71
+#define RH_RF22_TRCLK 0xc0
+#define RH_RF22_TRCLK_NONE 0x00
+#define RH_RF22_TRCLK_GPIO 0x40
+#define RH_RF22_TRCLK_SDO 0x80
+#define RH_RF22_TRCLK_NIRQ 0xc0
+#define RH_RF22_DTMOD 0x30
+#define RH_RF22_DTMOD_DIRECT_GPIO 0x00
+#define RH_RF22_DTMOD_DIRECT_SDI 0x10
+#define RH_RF22_DTMOD_FIFO 0x20
+#define RH_RF22_DTMOD_PN9 0x30
+#define RH_RF22_ENINV 0x08
+#define RH_RF22_FD8 0x04
+#define RH_RF22_MODTYP 0x30
+#define RH_RF22_MODTYP_UNMODULATED 0x00
+#define RH_RF22_MODTYP_OOK 0x01
+#define RH_RF22_MODTYP_FSK 0x02
+#define RH_RF22_MODTYP_GFSK 0x03
+
+
+// RH_RF22_REG_75_FREQUENCY_BAND_SELECT 0x75
+#define RH_RF22_SBSEL 0x40
+#define RH_RF22_HBSEL 0x20
+#define RH_RF22_FB 0x1f
+
+// Define this to include Serial printing in diagnostic routines
+#define RH_RF22_HAVE_SERIAL
+
+/////////////////////////////////////////////////////////////////////
+/// \class RH_RF22 RH_RF22.h <RH_RF22.h>
+/// \brief Driver to send and receive unaddressed, unreliable datagrams via an RF22 and compatible radio transceiver.
+///
+/// Works with RF22, RF23 based radio modules, and compatible chips and modules, including:
+/// - RF22 bare module: http://www.sparkfun.com/products/10153
+/// (Caution, that is a 3.3V part, and requires a 3.3V CPU such as Teensy etc or level shifters)
+/// - RF22 shield: http://www.sparkfun.com/products/11018
+/// - RF22 integrated board http://www.anarduino.com/miniwireless
+/// - RFM23BP bare module: http://www.anarduino.com/details.jsp?pid=130
+/// - Silicon Labs Si4430/31/32 based modules. S4432 is equivalent to RF22. Si4431/30 is equivalent to RF23.
+///
+/// Data based on https://www.sparkfun.com/datasheets/Wireless/General/RFM22B.pdf
+///
+/// \par Overview
+///
+/// This base class provides basic functions for sending and receiving unaddressed,
+/// unreliable datagrams of arbitrary length to 255 octets per packet.
+///
+/// Manager classes may use this class to implement reliable, addressed datagrams and streams,
+/// mesh routers, repeaters, translators etc.
+///
+/// On transmission, the TO and FROM addresses default to 0x00, unless changed by a subclass.
+/// On reception the TO addressed is checked against the node address (defaults to 0x00) or the
+/// broadcast address (which is 0xff). The ID and FLAGS are set to 0, and not checked by this class.
+/// This permits use of the this base RH_RF22 class as an
+/// unaddressed, unreliable datagram service without the use of one the RadioHead Manager classes.
+///
+/// Naturally, for any 2 radios to communicate that must be configured to use the same frequency and
+/// modulation scheme.
+///
+/// \par Details
+///
+/// This Driver provides an object-oriented interface for sending and receiving data messages with Hope-RF
+/// RF22 and RF23 based radio modules, and compatible chips and modules,
+/// including the RFM22B transceiver module such as
+/// this bare module: http://www.sparkfun.com/products/10153
+/// and this shield: http://www.sparkfun.com/products/11018
+/// and this module: http://www.hoperfusa.com/details.jsp?pid=131
+/// and this integrated board: http://www.anarduino.com/miniwireless
+/// and RF23BP modules such as this http://www.anarduino.com/details.jsp?pid=130
+///
+/// The Hope-RF (http://www.hoperf.com) RFM22B (http://www.hoperf.com/rf_fsk/fsk/RFM22B.htm)
+/// is a low-cost ISM transceiver module. It supports FSK, GFSK, OOK over a wide
+/// range of frequencies and programmable data rates.
+/// Manual can be found at https://www.sparkfun.com/datasheets/Wireless/General/RFM22.PDF
+///
+/// This library provides functions for sending and receiving messages of up to 255 octets on any
+/// frequency supported by the RF22B, in a range of predefined data rates and frequency deviations.
+/// Frequency can be set with 312Hz precision to any frequency from 240.0MHz to 960.0MHz.
+///
+/// Up to 3 RF22B modules can be connected to an Arduino, permitting the construction of translators
+/// and frequency changers, etc.
+///
+/// The following modulation types are suppported with a range of modem configurations for
+/// common data rates and frequency deviations:
+/// - GFSK Gaussian Frequency Shift Keying
+/// - FSK Frequency Shift Keying
+/// - OOK On-Off Keying
+///
+/// Support for other RF22B features such as on-chip temperature measurement, analog-digital
+/// converter, transmitter power control etc is also provided.
+///
+/// Tested on Arduino Diecimila, Uno and Mega with arduino-0021, 1.0.5
+/// on OpenSuSE 13.1 and avr-libc-1.6.1-1.15,
+/// cross-avr-binutils-2.19-9.1, cross-avr-gcc-4.1.3_20080612-26.5.
+/// With HopeRF RFM22 modules that appear to have RF22B chips on board:
+/// - Device Type Code = 0x08 (RX/TRX)
+/// - Version Code = 0x06
+/// Works on Duo. Works with Sparkfun RFM22 Wireless shields. Works with RFM22 modules from http://www.hoperfusa.com/
+/// Works with Arduino 1.0 to at least 1.0.5. Works on Maple, Flymaple, Uno32.
+///
+/// \par Packet Format
+///
+/// All messages sent and received by this Driver must conform to this packet format:
+///
+/// - 8 nibbles (4 octets) PREAMBLE
+/// - 2 octets SYNC 0x2d, 0xd4
+/// - 4 octets HEADER: (TO, FROM, ID, FLAGS)
+/// - 1 octet LENGTH (0 to 255), number of octets in DATA
+/// - 0 to 255 octets DATA
+/// - 2 octets CRC computed with CRC16(IBM), computed on HEADER, LENGTH and DATA
+///
+/// For technical reasons, the message format is not protocol compatible with the
+/// 'HopeRF Radio Transceiver Message Library for Arduino' http://www.airspayce.com/mikem/arduino/HopeRF from the same author. Nor is it compatible with
+/// 'Virtual Wire' http://www.airspayce.com/mikem/arduino/VirtualWire.pdf also from the same author.
+///
+/// \par Connecting RFM-22 to Arduino
+///
+/// If you have the Sparkfun RFM22 Shield (https://www.sparkfun.com/products/11018)
+/// the connections described below are done for you on the shield, no changes required,
+/// just add headers and plug it in to an Arduino (but not and Arduino Mega, see below)
+///
+/// The physical connection between the RF22B and the Arduino requires 3.3V,
+/// the 3 x SPI pins (SCK, SDI, SDO), a Slave Select pin and an interrupt pin.
+///
+/// Note also that on the RFM22B (but not the RFM23B), it is required to control the TX_ANT and
+/// RX_ANT pins of the RFM22 in order to control the antenna connection properly. The RH_RF22
+/// driver is configured by default so that GPIO0 and GPIO1 outputs can
+/// control TX_ANT and RX_ANT input pins respectively automatically. On RFM22,
+/// you must connect GPIO0
+/// to TX_ANT and GPIO1 to RX_ANT for this automatic antenna switching to
+/// occur. See setGpioReversed() for more details. These connections are not required on RFM23B.
+///
+/// If you are using the Sparkfun RF22 shield, it will work with any 5V arduino without modification.
+/// Connect the RFM-22 module to most Arduino's like this (Caution, Arduino Mega has different pins for SPI,
+/// see below).
+/// \code
+/// Arduino RFM-22B
+/// GND----------GND-\ (ground in)
+/// SDN-/ (shutdown in)
+/// 3V3----------VCC (3.3V in)
+/// interrupt 0 pin D2-----------NIRQ (interrupt request out)
+/// SS pin D10----------NSEL (chip select in)
+/// SCK pin D13----------SCK (SPI clock in)
+/// MOSI pin D11----------SDI (SPI Data in)
+/// MISO pin D12----------SDO (SPI data out)
+/// /--GPIO0 (GPIO0 out to control transmitter antenna TX_ANT)
+/// \--TX_ANT (TX antenna control in) RFM22B only
+/// /--GPIO1 (GPIO1 out to control receiver antenna RX_ANT)
+/// \--RX_ANT (RX antenna control in) RFM22B only
+/// \endcode
+/// For an Arduino Mega:
+/// \code
+/// Mega RFM-22B
+/// GND----------GND-\ (ground in)
+/// SDN-/ (shutdown in)
+/// 3V3----------VCC (3.3V in)
+/// interrupt 0 pin D2-----------NIRQ (interrupt request out)
+/// SS pin D53----------NSEL (chip select in)
+/// SCK pin D52----------SCK (SPI clock in)
+/// MOSI pin D51----------SDI (SPI Data in)
+/// MISO pin D50----------SDO (SPI data out)
+/// /--GPIO0 (GPIO0 out to control transmitter antenna TX_ANT)
+/// \--TX_ANT (TX antenna control in) RFM22B only
+/// /--GPIO1 (GPIO1 out to control receiver antenna RX_ANT)
+/// \--RX_ANT (RX antenna control in) RFM22B only
+/// \endcode
+/// For Chipkit Uno32. Caution: you must also ensure jumper JP4 on the Uno32 is set to RD4
+/// \code
+/// Arduino RFM-22B
+/// GND----------GND-\ (ground in)
+/// SDN-/ (shutdown in)
+/// 3V3----------VCC (3.3V in)
+/// interrupt 0 pin D38----------NIRQ (interrupt request out)
+/// SS pin D10----------NSEL (chip select in)
+/// SCK pin D13----------SCK (SPI clock in)
+/// MOSI pin D11----------SDI (SPI Data in)
+/// MISO pin D12----------SDO (SPI data out)
+/// /--GPIO0 (GPIO0 out to control transmitter antenna TX_ANT)
+/// \--TX_ANT (TX antenna control in) RFM22B only
+/// /--GPIO1 (GPIO1 out to control receiver antenna RX_ANT)
+/// \--RX_ANT (RX antenna control in) RFM22B only
+/// \endcode
+/// For Teensy 3.1
+/// \code
+/// Teensy RFM-22B
+/// GND----------GND-\ (ground in)
+/// SDN-/ (shutdown in)
+/// 3V3----------VCC (3.3V in)
+/// interrupt 2 pin D2-----------NIRQ (interrupt request out)
+/// SS pin D10----------NSEL (chip select in)
+/// SCK pin D13----------SCK (SPI clock in)
+/// MOSI pin D11----------SDI (SPI Data in)
+/// MISO pin D12----------SDO (SPI data out)
+/// /--GPIO0 (GPIO0 out to control transmitter antenna TX_ANT)
+/// \--TX_ANT (TX antenna control in) RFM22B only
+/// /--GPIO1 (GPIO1 out to control receiver antenna RX_ANT)
+/// \--RX_ANT (RX antenna control in) RFM22B only
+/// \endcode
+/// For connecting an Arduino to an RFM23BP module. Note that the antenna control pins are reversed
+/// compared to the RF22.
+/// \code
+/// Arduino RFM-23BP
+/// GND----------GND-\ (ground in)
+/// SDN-/ (shutdown in)
+/// 5V-----------VCC (5V in)
+/// interrupt 0 pin D2-----------NIRQ (interrupt request out)
+/// SS pin D10----------NSEL (chip select in)
+/// SCK pin D13----------SCK (SPI clock in)
+/// MOSI pin D11----------SDI (SPI Data in)
+/// MISO pin D12----------SDO (SPI data out)
+/// /--GPIO0 (GPIO0 out to control receiver antenna RXON)
+/// \--RXON (RX antenna control in)
+/// /--GPIO1 (GPIO1 out to control transmitter antenna TXON)
+/// \--TXON (TX antenna control in)
+/// \endcode
+///
+/// and you can then use the default constructor RH_RF22().
+/// You can override the default settings for the SS pin and the interrupt
+/// in the RH_RF22 constructor if you wish to connect the slave select SS to other than the normal one for your
+/// Arduino (D10 for Diecimila, Uno etc and D53 for Mega)
+/// or the interrupt request to other than pin D2 (Caution, different processors have different constraints as to the
+/// pins available for interrupts).
+///
+/// It is possible to have 2 radios connected to one Arduino, provided each radio has its own
+/// SS and interrupt line (SCK, SDI and SDO are common to both radios)
+///
+/// Caution: on some Arduinos such as the Mega 2560, if you set the slave select pin to be other than the usual SS
+/// pin (D53 on Mega 2560), you may need to set the usual SS pin to be an output to force the Arduino into SPI
+/// master mode.
+///
+/// Caution: Power supply requirements of the RF22 module may be relevant in some circumstances:
+/// RF22 modules are capable of pulling 80mA+ at full power, where Arduino's 3.3V line can
+/// give 50mA. You may need to make provision for alternate power supply for
+/// the RF22, especially if you wish to use full transmit power, and/or you have
+/// other shields demanding power. Inadequate power for the RF22 is reported to cause symptoms such as:
+/// - reset's/bootups terminate with "init failed" messages
+/// -random termination of communication after 5-30 packets sent/received
+/// -"fake ok" state, where initialization passes fluently, but communication doesn't happen
+/// -shields hang Arduino boards, especially during the flashing
+///
+/// Caution: some RF22 breakout boards (such as the HAB-RFM22B-BOA HAB-RFM22B-BO) reportedly
+/// have the TX_ANT and RX_ANT pre-connected to GPIO0 and GPIO1 round the wrong way. You can work with this
+/// if you use setGpioReversed().
+///
+/// Caution: If you are using a bare RF22 module without IO level shifters, you may have difficulty connecting
+/// to a 5V arduino. The RF22 module is 3.3V and its IO pins are 3.3V not 5V. Some Arduinos (Diecimila and
+/// Uno) seem to work OK with this, and some (Mega) do not always work reliably. Your Mileage May Vary.
+/// For best result, use level shifters, or use a RF22 shield or board with level shifters built in,
+/// such as the Sparkfun RFM22 shield http://www.sparkfun.com/products/11018.
+/// You could also use a 3.3V IO Arduino such as a Pro.
+/// It is recognised that it is difficult to connect
+/// the Sparkfun RFM22 shield to a Mega, since the SPI pins on the Mega are different to other Arduinos,
+/// But it is possible, by bending the SPI pins (D10, D11, D12, D13) on the
+/// shield out of the way before plugging it in to the Mega and jumpering the shield pins to the Mega like this:
+/// \code
+/// RF22 Shield Mega
+/// D10 D53
+/// D13 D52
+/// D11 D51
+/// D12 D50
+/// \endcode
+///
+/// \par Interrupts
+///
+/// The Driver uses interrupts to react to events in the RF22 module,
+/// such as the reception of a new packet, or the completion of transmission of a packet.
+/// The RH_RF22 interrupt service routine reads status from and writes data
+/// to the the RF22 module via the SPI interface. It is very important therefore,
+/// that if you are using the RF22 library with another SPI based deviced, that you
+/// disable interrupts while you transfer data to and from that other device.
+/// Use cli() to disable interrupts and sei() to reenable them.
+///
+/// \par SPI Interface
+///
+/// The RF22 module uses the SPI bus to communicate with the Arduino. Arduino
+/// IDE includes a hardware SPI class to communicate with SPI devices using
+/// the SPI facilities built into the Atmel chips, over the standard designated
+/// SPI pins MOSI, MISO, SCK, which are usually on Arduino pins 11, 12 and 13
+/// respectively (or 51, 50, 52 on a Mega).
+///
+/// By default, the RH_RF22 Driver uses the Hardware SPI interface to
+/// communicate with the RF22 module. However, if your RF22 SPI is connected to
+/// the Arduino through non-standard pins, or the standard Hardware SPI
+/// interface will not work for you, you can instead use a bit-banged Software
+/// SPI class RHSoftwareSPI, which can be configured to work on any Arduino digital IO pins.
+/// See the documentation of RHSoftwareSPI for details.
+///
+/// The advantages of the Software SPI interface are that it can be used on
+/// any Arduino pins, not just the usual dedicated hardware pins. The
+/// disadvantage is that it is significantly slower then hardware.
+/// If you observe reliable behaviour with the default hardware SPI RHHardwareSPI, but unreliable behaviour
+/// with Software SPI RHSoftwareSPI, it may be due to slow CPU performance.
+///
+/// Initialisation example with hardware SPI
+/// \code
+/// #include <RH_RF22.h>
+/// RH_RF22 driver;
+/// RHReliableDatagram manager(driver, CLIENT_ADDRESS);
+/// \endcode
+///
+/// Initialisation example with software SPI
+/// \code
+/// #include <RH_RF22.h>
+/// #include <RHSoftwareSPI.h>
+/// RHSoftwareSPI spi;
+/// RH_RF22 driver(10, 2, spi);
+/// RHReliableDatagram manager(driver, CLIENT_ADDRESS);
+/// \endcode
+///
+/// \par Memory
+///
+/// The RH_RF22 Driver requires non-trivial amounts of memory. The sample programs all compile to
+/// about 9 to 14kbytes each on Arduino, which will fit in the flash proram memory of most Arduinos. However,
+/// the RAM requirements are more critical. Most sample programs above will run on Duemilanova,
+/// but not on Diecimila. Even on Duemilanova, the RAM requirements are very close to the
+/// available memory of 2kbytes. Therefore, you should be vary sparing with RAM use in programs that use
+/// the RH_RF22 Driver on Duemilanova.
+///
+/// The sample RHRouter and RHMesh programs compile to about 14kbytes,
+/// and require more RAM than the others.
+/// They will not run on Duemilanova or Diecimila, but will run on Arduino Mega.
+///
+/// It is often hard to accurately identify when you are hitting RAM limits on Arduino.
+/// The symptoms can include:
+/// - Mysterious crashes and restarts
+/// - Changes in behaviour when seemingly unrelated changes are made (such as adding print() statements)
+/// - Hanging
+/// - Output from Serial.print() not appearing
+///
+/// With an Arduino Mega, with 8 kbytes of SRAM, there is much more RAM headroom for
+/// your own elaborate programs.
+/// This library is reported to work with Arduino Pro Mini, but that has not been tested by me.
+///
+/// The RF22M modules use an inexpensive crystal to control the frequency synthesizer, and therfore you can expect
+/// the transmitter and receiver frequencies to be subject to the usual inaccuracies of such crystals. The RF22
+/// contains an AFC circuit to compensate for differences in transmitter and receiver frequencies.
+/// It does this by altering the receiver frequency during reception by up to the pull-in frequency range.
+/// This RF22 library enables the AFC and by default sets the pull-in frequency range to
+/// 0.05MHz, which should be sufficient to handle most situations. However, if you observe unexplained packet losses
+/// or failure to operate correctly all the time it may be because your modules have a wider frequency difference, and
+/// you may need to set the afcPullInRange to a different value, using setFrequency();
+///
+/// \par Transmitter Power
+///
+/// You can control the transmitter power on the RF22 and RF23 transceivers
+/// with the RH_RF22::setTxPower() function. The argument can be any of the
+/// RH_RF22_TXPOW_* (for RFM22) or RH_RF22_RF23B_TXPOW_* (for RFM23) values.
+/// The default is RH_RF22_TXPOW_8DBM/RH_RF22_RF23B_TXPOW_1DBM . Eg:
+/// \code
+/// driver.setTxPower(RH_RF22_TXPOW_2DBM);
+/// \endcode
+///
+/// The RF23BP has higher power capability, there are
+/// several power settings that are specific to the RF23BP only:
+///
+/// - RH_RF22_RF23BP_TXPOW_28DBM
+/// - RH_RF22_RF23BP_TXPOW_29DBM
+/// - RH_RF22_RF23BP_TXPOW_38DBM
+///
+/// CAUTION: the high power settings available on the RFM23BP require
+/// significant power supply current. For example at +30dBm, the typical chip
+/// supply current is 550mA. This will overwhelm some small CPU board power
+/// regulators and USB supplies. If you use this chip at high power make sure
+/// you have an adequate supply current providing full 5V to the RFM23BP (and
+/// the CPU if required), otherwise you can expect strange behaviour like
+/// hanging, stopping, incorrect power levels, RF power amp overheating etc.
+/// You must also ensure that the RFM23BP GPIO pins are connected to the
+/// antenna switch control pins like so:
+////
+/// \code
+/// GPIO0 <-> RXON
+/// GPIO1 <-> TXON
+/// \endcode
+///
+/// The RF output impedance of the RFM22BP module is 50 ohms. In our
+/// experiments we found that the most critical issue (besides a suitable
+/// power supply) is to ensure that the antenna impedance is also near 50
+/// ohms. Connecting a simple 1/4 wavelength (ie a 17.3cm single wire)
+/// directly to the antenna output <b>will not work at full 30dBm power</b>,
+/// and will result in the transmitter hanging and/or the power amp
+/// overheating. Connect a proper 50 ohm impedance transmission line or
+/// antenna, and prevent RF radiation into the radio and arduino modules,
+/// in order to get full, reliable power. Our tests show that a 433MHz
+/// RFM23BP feeding a 50 ohm transmission line with a VHF discone antenna at
+/// the end results in full power output and the power amp transistor on the
+/// RFM22BP module runnning slightly warm but not hot. We recommend you use
+/// the services of a competent RF engineer when trying to use this high power
+/// module.
+///
+/// Note: with RFM23BP, the reported maximum possible power when operating on 3.3V is 27dBm.
+///
+/// We have made some actual power measurements against
+/// programmed power for Sparkfun RFM22 wireless module under the following conditions:
+/// - Sparkfun RFM22 wireless module, Duemilanove, USB power
+/// - 10cm RG58C/U soldered direct to RFM22 module ANT and GND
+/// - bnc connecteor
+/// - 12dB attenuator
+/// - BNC-SMA adapter
+/// - MiniKits AD8307 HF/VHF Power Head (calibrated against Rohde&Schwartz 806.2020 test set)
+/// - Tektronix TDS220 scope to measure the Vout from power head
+/// \code
+/// Program power Measured Power
+/// dBm dBm
+/// 1 -5.6
+/// 2 -3.8
+/// 5 -2.2
+/// 8 -0.6
+/// 11 1.2
+/// 14 11.6
+/// 17 14.4
+/// 20 18.0
+/// \endcode
+/// (Caution: we dont claim laboratory accuracy for these measurements)
+/// You would not expect to get anywhere near these powers to air with a simple 1/4 wavelength wire antenna.
+///
+/// \par Performance
+///
+/// Some simple speed performance tests have been conducted.
+/// In general packet transmission rate will be limited by the modulation scheme.
+/// Also, if your code does any slow operations like Serial printing it will also limit performance.
+/// We disabled any printing in the tests below.
+/// We tested with RH_RF22::GFSK_Rb125Fd125, which is probably the fastest scheme available.
+/// We tested with a 13 octet message length, over a very short distance of 10cm.
+///
+/// Transmission (no reply) tests with modulation RH_RF22::GFSK_Rb125Fd125 and a
+/// 13 octet message show about 330 messages per second transmitted.
+///
+/// Transmit-and-wait-for-a-reply tests with modulation RH_RF22::GFSK_Rb125Fd125 and a
+/// 13 octet message (send and receive) show about 160 round trips per second.
+///
+/// \par Compatibility with RF22 library
+/// The RH_RF22 driver is based on our earlier RF22 library http://www.airspayce.com/mikem/arduino/RF22
+/// We have tried hard to be as compatible as possible with the earlier RF22 library, but there are some differences:
+/// - Different constructor.
+/// - Indexes for some modem configurations have changed (we recommend you use the symbolic names, not integer indexes).
+///
+/// The major difference is that under RadioHead, you are
+/// required to create 2 objects (ie RH_RF22 and a manager) instead of just one object under RF22
+/// (ie RHMesh, RHRouter, RHReliableDatagram or RHDatagram).
+/// It may be sufficient or you to change for example:
+/// \code
+/// RF22ReliableDatagram rf22(CLIENT_ADDRESS);
+/// \endcode
+/// to:
+/// \code
+/// RH_RF22 driver;
+/// RHReliableDatagram rf22(driver, CLIENT_ADDRESS);
+/// \endcode
+/// and any instance of RF22_MAX_MESSAGE_LEN to RH_RF22_MAX_MESSAGE_LEN
+///
+/// RadioHead version 1.6 changed the way the interrupt pin number is
+/// specified on Arduino and Uno32 platforms. If your code previously
+/// specifed a non-default interrupt pin number in the RH_RF22 constructor,
+/// you may need to review your code to specify the correct interrrupt pin
+/// (and not the interrupt number as before).
+class RH_RF22 : public RHSPIDriver
+{
+public:
+
+ /// \brief Defines register values for a set of modem configuration registers
+ ///
+ /// Defines register values for a set of modem configuration registers
+ /// that can be passed to setModemConfig()
+ /// if none of the choices in ModemConfigChoice suit your need
+ /// setModemConfig() writes the register values to the appropriate RH_RF22 registers
+ /// to set the desired modulation type, data rate and deviation/bandwidth.
+ /// Suitable values for these registers can be computed using the register calculator at
+ /// http://www.hoperf.com/upload/rf/RF22B%2023B%2031B%2042B%2043B%20Register%20Settings_RevB1-v5.xls
+ typedef struct
+ {
+ uint8_t reg_1c; ///< Value for register RH_RF22_REG_1C_IF_FILTER_BANDWIDTH
+ uint8_t reg_1f; ///< Value for register RH_RF22_REG_1F_CLOCK_RECOVERY_GEARSHIFT_OVERRIDE
+ uint8_t reg_20; ///< Value for register RH_RF22_REG_20_CLOCK_RECOVERY_OVERSAMPLING_RATE
+ uint8_t reg_21; ///< Value for register RH_RF22_REG_21_CLOCK_RECOVERY_OFFSET2
+ uint8_t reg_22; ///< Value for register RH_RF22_REG_22_CLOCK_RECOVERY_OFFSET1
+ uint8_t reg_23; ///< Value for register RH_RF22_REG_23_CLOCK_RECOVERY_OFFSET0
+ uint8_t reg_24; ///< Value for register RH_RF22_REG_24_CLOCK_RECOVERY_TIMING_LOOP_GAIN1
+ uint8_t reg_25; ///< Value for register RH_RF22_REG_25_CLOCK_RECOVERY_TIMING_LOOP_GAIN0
+ uint8_t reg_2c; ///< Value for register RH_RF22_REG_2C_OOK_COUNTER_VALUE_1
+ uint8_t reg_2d; ///< Value for register RH_RF22_REG_2D_OOK_COUNTER_VALUE_2
+ uint8_t reg_2e; ///< Value for register RH_RF22_REG_2E_SLICER_PEAK_HOLD
+ uint8_t reg_58; ///< Value for register RH_RF22_REG_58_CHARGE_PUMP_CURRENT_TRIMMING
+ uint8_t reg_69; ///< Value for register RH_RF22_REG_69_AGC_OVERRIDE1
+ uint8_t reg_6e; ///< Value for register RH_RF22_REG_6E_TX_DATA_RATE1
+ uint8_t reg_6f; ///< Value for register RH_RF22_REG_6F_TX_DATA_RATE0
+ uint8_t reg_70; ///< Value for register RH_RF22_REG_70_MODULATION_CONTROL1
+ uint8_t reg_71; ///< Value for register RH_RF22_REG_71_MODULATION_CONTROL2
+ uint8_t reg_72; ///< Value for register RH_RF22_REG_72_FREQUENCY_DEVIATION
+ } ModemConfig;
+
+ /// Choices for setModemConfig() for a selected subset of common modulation types,
+ /// and data rates. If you need another configuration, use the register calculator.
+ /// and call setModemRegisters() with your desired settings.
+ /// These are indexes into MODEM_CONFIG_TABLE. We strongly recommend you use these symbolic
+ /// definitions and not their integer equivalents: its possible that new values will be
+ /// introduced in later versions (though we will try to avoid it).
+ typedef enum
+ {
+ UnmodulatedCarrier = 0, ///< Unmodulated carrier for testing
+ FSK_PN9_Rb2Fd5, ///< FSK, No Manchester, Rb = 2kbs, Fd = 5kHz, PN9 random modulation for testing
+
+ FSK_Rb2Fd5, ///< FSK, No Manchester, Rb = 2kbs, Fd = 5kHz
+ FSK_Rb2_4Fd36, ///< FSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz
+ FSK_Rb4_8Fd45, ///< FSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz
+ FSK_Rb9_6Fd45, ///< FSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz
+ FSK_Rb19_2Fd9_6, ///< FSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz
+ FSK_Rb38_4Fd19_6, ///< FSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz
+ FSK_Rb57_6Fd28_8, ///< FSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz
+ FSK_Rb125Fd125, ///< FSK, No Manchester, Rb = 125kbs, Fd = 125kHz
+ FSK_Rb_512Fd2_5, ///< FSK, No Manchester, Rb = 512bs, Fd = 2.5kHz, for POCSAG compatibility
+ FSK_Rb_512Fd4_5, ///< FSK, No Manchester, Rb = 512bs, Fd = 4.5kHz, for POCSAG compatibility
+
+ GFSK_Rb2Fd5, ///< GFSK, No Manchester, Rb = 2kbs, Fd = 5kHz
+ GFSK_Rb2_4Fd36, ///< GFSK, No Manchester, Rb = 2.4kbs, Fd = 36kHz
+ GFSK_Rb4_8Fd45, ///< GFSK, No Manchester, Rb = 4.8kbs, Fd = 45kHz
+ GFSK_Rb9_6Fd45, ///< GFSK, No Manchester, Rb = 9.6kbs, Fd = 45kHz
+ GFSK_Rb19_2Fd9_6, ///< GFSK, No Manchester, Rb = 19.2kbs, Fd = 9.6kHz
+ GFSK_Rb38_4Fd19_6, ///< GFSK, No Manchester, Rb = 38.4kbs, Fd = 19.6kHz
+ GFSK_Rb57_6Fd28_8, ///< GFSK, No Manchester, Rb = 57.6kbs, Fd = 28.8kHz
+ GFSK_Rb125Fd125, ///< GFSK, No Manchester, Rb = 125kbs, Fd = 125kHz
+
+ OOK_Rb1_2Bw75, ///< OOK, No Manchester, Rb = 1.2kbs, Rx Bandwidth = 75kHz
+ OOK_Rb2_4Bw335, ///< OOK, No Manchester, Rb = 2.4kbs, Rx Bandwidth = 335kHz
+ OOK_Rb4_8Bw335, ///< OOK, No Manchester, Rb = 4.8kbs, Rx Bandwidth = 335kHz
+ OOK_Rb9_6Bw335, ///< OOK, No Manchester, Rb = 9.6kbs, Rx Bandwidth = 335kHz
+ OOK_Rb19_2Bw335, ///< OOK, No Manchester, Rb = 19.2kbs, Rx Bandwidth = 335kHz
+ OOK_Rb38_4Bw335, ///< OOK, No Manchester, Rb = 38.4kbs, Rx Bandwidth = 335kHz
+ OOK_Rb40Bw335 ///< OOK, No Manchester, Rb = 40kbs, Rx Bandwidth = 335kHz
+
+ } ModemConfigChoice;
+
+ /// \brief Defines the available choices for CRC
+ /// Types of permitted CRC polynomials, to be passed to setCRCPolynomial()
+ /// They deliberately have the same numeric values as the crc[1:0] field of Register
+ /// RH_RF22_REG_30_DATA_ACCESS_CONTROL
+ typedef enum
+ {
+ CRC_CCITT = 0, ///< CCITT
+ CRC_16_IBM = 1, ///< CRC-16 (IBM) The default used by RH_RF22 driver
+ CRC_IEC_16 = 2, ///< IEC-16
+ CRC_Biacheva = 3 ///< Biacheva
+ } CRCPolynomial;
+
+ /// Constructor. You can have multiple instances, but each instance must have its own
+ /// interrupt and slave select pin. After constructing, you must call init() to initialise the interface
+ /// and the radio module. A maximum of 3 instances can co-exist on one processor, provided there are sufficient
+ /// distinct interrupt lines, one for each instance.
+ /// \param[in] slaveSelectPin the Arduino pin number of the output to use to select the RH_RF22 before
+ /// accessing it. Defaults to the normal SS pin for your Arduino (D10 for Diecimila, Uno etc, D53 for Mega, D10 for Maple)
+ /// \param[in] interruptPin The interrupt Pin number that is connected to the RF22 NIRQ interrupt line.
+ /// Defaults to pin 2, as required by sparkfun RFM22 module shields.
+ /// Caution: You must specify an interrupt capable pin.
+ /// On many Arduino boards, there are limitations as to which pins may be used as interrupts.
+ /// On Leonardo pins 0, 1, 2 or 3. On Mega2560 pins 2, 3, 18, 19, 20, 21. On Due and Teensy, any digital pin.
+ /// On other Arduinos pins 2 or 3.
+ /// See http://arduino.cc/en/Reference/attachInterrupt for more details.
+ /// On Chipkit Uno32, pins 38, 2, 7, 8, 35.
+ /// On other boards, any digital pin may be used.
+ /// \param[in] spi Pointer to the SPI interface object to use.
+ /// Defaults to the standard Arduino hardware SPI interface
+ RH_RF22(PINS slaveSelectPin, PINS interruptPin, RHGenericSPI& spi = hardware_spi);
+
+ /// Initialises this instance and the radio module connected to it.
+ /// The following steps are taken:
+ /// - Initialise the slave select pin and the SPI interface library
+ /// - Software reset the RH_RF22 module
+ /// - Checks the connected RH_RF22 module is either a RH_RF22_DEVICE_TYPE_RX_TRX or a RH_RF22_DEVICE_TYPE_TX
+ /// - Attaches an interrupt handler
+ /// - Configures the RH_RF22 module
+ /// - Sets the frequency to 434.0 MHz
+ /// - Sets the modem data rate to FSK_Rb2_4Fd36
+ /// \return true if everything was successful
+ bool init();
+
+ /// Issues a software reset to the
+ /// RH_RF22 module. Blocks for 1ms to ensure the reset is complete.
+ void reset();
+
+ /// Reads and returns the device status register RH_RF22_REG_02_DEVICE_STATUS
+ /// \return The value of the device status register
+ uint8_t statusRead();
+
+ /// Reads a value from the on-chip analog-digital converter
+ /// \param[in] adcsel Selects the ADC input to measure. One of RH_RF22_ADCSEL_*. Defaults to the
+ /// internal temperature sensor
+ /// \param[in] adcref Specifies the refernce voltage to use. One of RH_RF22_ADCREF_*.
+ /// Defaults to the internal bandgap voltage.
+ /// \param[in] adcgain Amplifier gain selection.
+ /// \param[in] adcoffs Amplifier offseet (0 to 15).
+ /// \return The analog value. 0 to 255.
+ uint8_t adcRead(uint8_t adcsel = RH_RF22_ADCSEL_INTERNAL_TEMPERATURE_SENSOR,
+ uint8_t adcref = RH_RF22_ADCREF_BANDGAP_VOLTAGE,
+ uint8_t adcgain = 0,
+ uint8_t adcoffs = 0);
+
+ /// Reads the on-chip temperature sensor
+ /// \param[in] tsrange Specifies the temperature range to use. One of RH_RF22_TSRANGE_*
+ /// \param[in] tvoffs Specifies the temperature value offset. This is actually signed value
+ /// added to the measured temperature value
+ /// \return The measured temperature.
+ uint8_t temperatureRead(uint8_t tsrange = RH_RF22_TSRANGE_M64_64C, uint8_t tvoffs = 0);
+
+ /// Reads the wakeup timer value in registers RH_RF22_REG_17_WAKEUP_TIMER_VALUE1
+ /// and RH_RF22_REG_18_WAKEUP_TIMER_VALUE2
+ /// \return The wakeup timer value
+ uint16_t wutRead();
+
+ /// Sets the wakeup timer period registers RH_RF22_REG_14_WAKEUP_TIMER_PERIOD1,
+ /// RH_RF22_REG_15_WAKEUP_TIMER_PERIOD2 and RH_RF22_R<EG_16_WAKEUP_TIMER_PERIOD3
+ /// \param[in] wtm Wakeup timer mantissa value
+ /// \param[in] wtr Wakeup timer exponent R value
+ /// \param[in] wtd Wakeup timer exponent D value
+ void setWutPeriod(uint16_t wtm, uint8_t wtr = 0, uint8_t wtd = 0);
+
+ /// Sets the transmitter and receiver centre frequency
+ /// \param[in] centre Frequency in MHz. 240.0 to 960.0. Caution, some versions of RH_RF22 and derivatives
+ /// implemented more restricted frequency ranges.
+ /// \param[in] afcPullInRange Sets the AF Pull In Range in MHz. Defaults to 0.05MHz (50kHz).
+ /// Range is 0.0 to 0.159375
+ /// for frequencies 240.0 to 480MHz, and 0.0 to 0.318750MHz for frequencies 480.0 to 960MHz,
+ /// \return true if the selected frquency centre + (fhch * fhs) is within range and the afcPullInRange
+ /// is within range
+ bool setFrequency(float centre, float afcPullInRange = 0.05);
+
+ /// Sets the frequency hopping step size.
+ /// \param[in] fhs Frequency Hopping step size in 10kHz increments
+ /// \return true if centre + (fhch * fhs) is within limits
+ bool setFHStepSize(uint8_t fhs);
+
+ /// Sets the frequncy hopping channel. Adds fhch * fhs to centre frequency
+ /// \param[in] fhch The channel number
+ /// \return true if the selected frquency centre + (fhch * fhs) is within range
+ bool setFHChannel(uint8_t fhch);
+
+ /// Reads and returns the current RSSI value from register RH_RF22_REG_26_RSSI. Caution: this is
+ /// in internal units (see figure 31 of RFM22B/23B documentation), not in dBm. If you want to find the RSSI in dBm
+ /// of the last received message, use lastRssi() instead.
+ /// \return The current RSSI value
+ uint8_t rssiRead();
+
+ /// Reads and returns the current EZMAC value from register RH_RF22_REG_31_EZMAC_STATUS
+ /// \return The current EZMAC value
+ uint8_t ezmacStatusRead();
+
+ /// Sets the parameters for the RH_RF22 Idle mode in register RH_RF22_REG_07_OPERATING_MODE.
+ /// Idle mode is the mode the RH_RF22 will be in when not transmitting or receiving. The default idle mode
+ /// is RH_RF22_XTON ie READY mode.
+ /// \param[in] mode Mask of mode bits, using RH_RF22_SWRES, RH_RF22_ENLBD, RH_RF22_ENWT,
+ /// RH_RF22_X32KSEL, RH_RF22_PLLON, RH_RF22_XTON.
+ void setOpMode(uint8_t mode);
+
+ /// If current mode is Rx or Tx changes it to Idle. If the transmitter or receiver is running,
+ /// disables them.
+ void setModeIdle();
+
+ /// If current mode is Tx or Idle, changes it to Rx.
+ /// Starts the receiver in the RH_RF22.
+ void setModeRx();
+
+ /// If current mode is Rx or Idle, changes it to Rx.
+ /// Starts the transmitter in the RH_RF22.
+ void setModeTx();
+
+ /// Sets the transmitter power output level in register RH_RF22_REG_6D_TX_POWER.
+ /// Be a good neighbour and set the lowest power level you need.
+ /// After init(), the power will be set to RH_RF22::RH_RF22_TXPOW_8DBM on RF22B
+ /// or RH_RF22_RF23B_TXPOW_1DBM on an RF23B.
+ /// The highest power available on RF22B is RH_RF22::RH_RF22_TXPOW_20DBM (20dBm).
+ /// The highest power available on RF23B is RH_RF22::RH_RF22_RF23B_TXPOW_13DBM (13dBm).
+ /// Higher powers are available on RF23BP (using RH_RF22_RF23BP_TXPOW_*),
+ /// and then only with an adequate power supply. See comments above.
+ /// Caution: In some countries you may only select certain higher power levels if you
+ /// are also using frequency hopping. Make sure you are aware of the legal
+ /// limitations and regulations in your region.
+ /// \param[in] power Transmitter power level, one of RH_RF22_*TXPOW_*
+ void setTxPower(uint8_t power);
+
+ /// Sets all the registered required to configure the data modem in the RH_RF22, including the data rate,
+ /// bandwidths etc. You cas use this to configure the modem with custom configuraitons if none of the
+ /// canned configurations in ModemConfigChoice suit you.
+ /// \param[in] config A ModemConfig structure containing values for the modem configuration registers.
+ void setModemRegisters(const ModemConfig* config);
+
+ /// Select one of the predefined modem configurations. If you need a modem configuration not provided
+ /// here, use setModemRegisters() with your own ModemConfig.
+ /// \param[in] index The configuration choice.
+ /// \return true if index is a valid choice.
+ bool setModemConfig(ModemConfigChoice index);
+
+ /// Starts the receiver and checks whether a received message is available.
+ /// This can be called multiple times in a timeout loop
+ /// \return true if a complete, valid message has been received and is able to be retrieved by
+ /// recv()
+ bool available();
+
+ /// Turns the receiver on if it not already on.
+ /// If there is a valid message available, copy it to buf and return true
+ /// else return false.
+ /// If a message is copied, *len is set to the length (Caution, 0 length messages are permitted).
+ /// You should be sure to call this function frequently enough to not miss any messages
+ /// It is recommended that you call it in your main loop.
+ /// \param[in] buf Location to copy the received message
+ /// \param[in,out] len Pointer to available space in buf. Set to the actual number of octets copied.
+ /// \return true if a valid message was copied to buf
+ bool recv(uint8_t* buf, uint8_t* len);
+
+ /// Waits until any previous transmit packet is finished being transmitted with waitPacketSent().
+ /// Then loads a message into the transmitter and starts the transmitter. Note that a message length
+ /// of 0 is NOT permitted.
+ /// \param[in] data Array of data to be sent
+ /// \param[in] len Number of bytes of data to send (> 0)
+ /// \return true if the message length was valid and it was correctly queued for transmit
+ bool send(const uint8_t* data, uint8_t len);
+
+ /// Sets the length of the preamble
+ /// in 4-bit nibbles.
+ /// Caution: this should be set to the same
+ /// value on all nodes in your network. Default is 8.
+ /// Sets the message preamble length in RH_RF22_REG_34_PREAMBLE_LENGTH
+ /// \param[in] nibbles Preamble length in nibbles of 4 bits each.
+ void setPreambleLength(uint8_t nibbles);
+
+ /// Sets the sync words for transmit and receive in registers RH_RF22_REG_36_SYNC_WORD3
+ /// to RH_RF22_REG_39_SYNC_WORD0
+ /// Caution: SyncWords should be set to the same
+ /// value on all nodes in your network. Nodes with different SyncWords set will never receive
+ /// each others messages, so different SyncWords can be used to isolate different
+ /// networks from each other. Default is { 0x2d, 0xd4 }.
+ /// \param[in] syncWords Array of sync words, 1 to 4 octets long
+ /// \param[in] len Number of sync words to set, 1 to 4.
+ void setSyncWords(const uint8_t* syncWords, uint8_t len);
+
+ /// Tells the receiver to accept messages with any TO address, not just messages
+ /// addressed to thisAddress or the broadcast address
+ /// \param[in] promiscuous true if you wish to receive messages with any TO address
+ virtual void setPromiscuous(bool promiscuous);
+
+ /// Sets the CRC polynomial to be used to generate the CRC for both receive and transmit
+ /// otherwise the default of CRC_16_IBM will be used.
+ /// \param[in] polynomial One of RH_RF22::CRCPolynomial choices CRC_*
+ /// \return true if polynomial is a valid option for this radio.
+ bool setCRCPolynomial(CRCPolynomial polynomial);
+
+ /// Configures GPIO pins for reversed GPIO connections to the antenna switch.
+ /// Normally on RF22 modules, GPIO0(out) is connected to TX_ANT(in) to enable tx antenna during transmit
+ /// and GPIO1(out) is connected to RX_ANT(in) to enable rx antenna during receive. The RH_RF22 driver
+ /// configures the GPIO pins during init() so the antenna switch works as expected.
+ /// However, some RF22 modules, such as HAB-RFM22B-BOA HAB-RFM22B-BO, also Si4432 sold by Dorji.com via Tindie.com
+ /// have these GPIO pins reversed, so that GPIO0 is connected to RX_ANT.
+ /// Call this function with a true argument after init() and before transmitting
+ /// in order to configure the module for reversed GPIO pins.
+ /// \param[in] gpioReversed Set to true if your RF22 module has reversed GPIO antenna switch connections.
+ void setGpioReversed(bool gpioReversed = false);
+
+ /// Returns the time in millis since the last preamble was received, and when the last
+ /// RSSI measurement was made.
+ uint32_t getLastPreambleTime();
+
+ /// The maximum message length supported by this driver
+ /// \return The maximum message length supported by this driver
+ uint8_t maxMessageLength();
+
+ /// Sets the radio into low-power sleep mode.
+ /// If successful, the transport will stay in sleep mode until woken by
+ /// changing mode it idle, transmit or receive (eg by calling send(), recv(), available() etc)
+ /// Caution: there is a time penalty as the radio takes a finite time to wake from sleep mode.
+ /// \return true if sleep mode was successfully entered.
+ virtual bool sleep();
+
+protected:
+ /// This is a low level function to handle the interrupts for one instance of RH_RF22.
+ /// Called automatically by isr*()
+ /// Should not need to be called.
+ void handleInterrupt();
+
+ /// Clears the receiver buffer.
+ /// Internal use only
+ void clearRxBuf();
+
+ /// Clears the transmitter buffer
+ /// Internal use only
+ void clearTxBuf();
+
+ /// Fills the transmitter buffer with the data of a mesage to be sent
+ /// \param[in] data Array of data bytes to be sent (1 to 255)
+ /// \param[in] len Number of data bytes in data (> 0)
+ /// \return true if the message length is valid
+ bool fillTxBuf(const uint8_t* data, uint8_t len);
+
+ /// Appends the transmitter buffer with the data of a mesage to be sent
+ /// \param[in] data Array of data bytes to be sent (0 to 255)
+ /// \param[in] len Number of data bytes in data
+ /// \return false if the resulting message would exceed RH_RF22_MAX_MESSAGE_LEN, else true
+ bool appendTxBuf(const uint8_t* data, uint8_t len);
+
+ /// Internal function to load the next fragment of
+ /// the current message into the transmitter FIFO
+ /// Internal use only
+ void sendNextFragment();
+
+ /// function to copy the next fragment from
+ /// the receiver FIF) into the receiver buffer
+ void readNextFragment();
+
+ /// Clears the RF22 Rx and Tx FIFOs
+ /// Internal use only
+ void resetFifos();
+
+ /// Clears the RF22 Rx FIFO
+ /// Internal use only
+ void resetRxFifo();
+
+ /// Clears the RF22 Tx FIFO
+ /// Internal use only
+ void resetTxFifo();
+
+ /// This function will be called by handleInterrupt() if an RF22 external interrupt occurs.
+ /// This can only happen if external interrupts are enabled in the RF22
+ /// (which they are not by default).
+ /// Subclasses may override this function to get control when an RF22 external interrupt occurs.
+ virtual void handleExternalInterrupt();
+
+ /// This function will be called by handleInterrupt() if an RF22 wakeup timer interrupt occurs.
+ /// This can only happen if wakeup timer interrupts are enabled in theRF22
+ /// (which they are not by default).
+ /// Subclasses may override this function to get control when an RF22 wakeup timer interrupt occurs.
+ virtual void handleWakeupTimerInterrupt();
+
+ /// Start the transmission of the contents
+ /// of the Tx buffer
+ void startTransmit();
+
+ /// ReStart the transmission of the contents
+ /// of the Tx buffer after a atransmission failure
+ void restartTransmit();
+
+ void setThisAddress(uint8_t thisAddress);
+
+ /// Sets the radio operating mode for the case when the driver is idle (ie not
+ /// transmitting or receiving), allowing you to control the idle mode power requirements
+ /// at the expense of slower transitions to transmit and receive modes.
+ /// By default, the idle mode is RH_RF22_XTON,
+ /// but eg setIdleMode(RH_RF22_PLL) will provide a much lower
+ /// idle current but slower transitions. Call this function after init().
+ /// \param[in] idleMode The chip operating mode to use when the driver is idle. One of the valid definitions for RH_RF22_REG_07_OPERATING_MODE
+ void setIdleMode(uint8_t idleMode);
+
+protected:
+ /// Low level interrupt service routine for RF22 connected to interrupt 0
+ static void isr0();
+
+ /// Low level interrupt service routine for RF22 connected to interrupt 1
+ static void isr1();
+
+ /// Low level interrupt service routine for RF22 connected to interrupt 1
+ static void isr2();
+
+ /// Array of instances connected to interrupts 0 and 1
+ static RH_RF22* _deviceForInterrupt[];
+
+ /// Index of next interrupt number to use in _deviceForInterrupt
+ static uint8_t _interruptCount;
+
+#if (RH_PLATFORM == RH_PLATFORM_MBED)
+ /// The configured interrupt pin connected to this instance
+ InterruptIn _interruptPin;
+#else
+ /// The configured interrupt pin connected to this instance
+ uint8_t _interruptPin;
+#endif
+
+ /// The index into _deviceForInterrupt[] for this device (if an interrupt is already allocated)
+ /// else 0xff
+ uint8_t _myInterruptIndex;
+
+ /// The radio mode to use when mode is idle
+ uint8_t _idleMode;
+
+ /// The device type reported by the RF22
+ uint8_t _deviceType;
+
+ /// The selected CRC polynomial
+ CRCPolynomial _polynomial;
+
+ // These volatile members may get changed in the interrupt service routine
+ /// Number of octets in the receiver buffer
+ volatile uint8_t _bufLen;
+
+ /// The receiver buffer
+ uint8_t _buf[RH_RF22_MAX_MESSAGE_LEN];
+
+ /// True when there is a valid message in the Rx buffer
+ volatile bool _rxBufValid;
+
+ /// Index into TX buffer of the next to send chunk
+ volatile uint8_t _txBufSentIndex;
+
+ /// Time in millis since the last preamble was received (and the last time the RSSI was measured)
+ uint32_t _lastPreambleTime;
+};
+
+/// @example rf22_client.pde
+/// @example rf22_server.pde
+
+#endif