wayne roberts / Mbed OS alarm_slave

raises pin at time instructed by received LoRa packet.

Dependencies:   sx126x sx12xx_hal

radio chip selection

Radio chip driver is not included, allowing choice of radio device.
If you're using SX1272 or SX1276, then import sx127x driver into your program.
if you're using SX1261 or SX1262, then import sx126x driver into your program.
if you're using SX1280, then import sx1280 driver into your program.
If you're using NAmote72 or Murata discovery, then you must import only sx127x driver.

Transmitter side is at Alarm Slave project page.
Output is observed on nucleo morpho connector pins pin[A-D]: see code for actual pins used.

main.cpp@0:b6ec8db2edbf, 2017-08-22 (annotated)

Committer:
dudmuck
Date:
Tue Aug 22 10:16:06 2017 -0700
Revision:
0:b6ec8db2edbf
Child:
1:6a3a48d657a9
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dudmuck 0:b6ec8db2edbf 1 #include "sx127x_lora.h"
dudmuck 0:b6ec8db2edbf 2
dudmuck 0:b6ec8db2edbf 3 DigitalOut myled(LED1);
dudmuck 0:b6ec8db2edbf 4
dudmuck 0:b6ec8db2edbf 5 SPI spi(D11, D12, D13); // mosi, miso, sclk
dudmuck 0:b6ec8db2edbf 6 // dio0, dio1, nss, spi, rst
dudmuck 0:b6ec8db2edbf 7 SX127x radio( D2, D3, D10, spi, A0); // sx1276 arduino shield
dudmuck 0:b6ec8db2edbf 8
dudmuck 0:b6ec8db2edbf 9 SX127x_lora lora(radio);
dudmuck 0:b6ec8db2edbf 10 DigitalInOut rfsw(A4); // for SX1276 arduino shield
dudmuck 0:b6ec8db2edbf 11
dudmuck 0:b6ec8db2edbf 12 void rfsw_callback()
dudmuck 0:b6ec8db2edbf 13 {
dudmuck 0:b6ec8db2edbf 14 if (radio.RegOpMode.bits.Mode == RF_OPMODE_TRANSMITTER)
dudmuck 0:b6ec8db2edbf 15 rfsw = 1;
dudmuck 0:b6ec8db2edbf 16 else
dudmuck 0:b6ec8db2edbf 17 rfsw = 0;
dudmuck 0:b6ec8db2edbf 18 }
dudmuck 0:b6ec8db2edbf 19 /**********************************************************************/
dudmuck 0:b6ec8db2edbf 20 DigitalOut pc_3(PC_3);
dudmuck 0:b6ec8db2edbf 21 Timeout to;
dudmuck 0:b6ec8db2edbf 22
dudmuck 0:b6ec8db2edbf 23 #define PIN_ASSERT_us 200000
dudmuck 0:b6ec8db2edbf 24 #define CMD_ALARM 0x01
dudmuck 0:b6ec8db2edbf 25
dudmuck 0:b6ec8db2edbf 26 void alarm_pin_clr()
dudmuck 0:b6ec8db2edbf 27 {
dudmuck 0:b6ec8db2edbf 28 pc_3 = 0;
dudmuck 0:b6ec8db2edbf 29 }
dudmuck 0:b6ec8db2edbf 30
dudmuck 0:b6ec8db2edbf 31 void alarm_pin_set()
dudmuck 0:b6ec8db2edbf 32 {
dudmuck 0:b6ec8db2edbf 33 pc_3 = 1;
dudmuck 0:b6ec8db2edbf 34 to.attach_us(&alarm_pin_clr, PIN_ASSERT_us);
dudmuck 0:b6ec8db2edbf 35 }
dudmuck 0:b6ec8db2edbf 36
dudmuck 0:b6ec8db2edbf 37 static uint16_t crc_ccitt( uint8_t *buffer, uint16_t length )
dudmuck 0:b6ec8db2edbf 38 {
dudmuck 0:b6ec8db2edbf 39 // The CRC calculation follows CCITT
dudmuck 0:b6ec8db2edbf 40 const uint16_t polynom = 0x1021;
dudmuck 0:b6ec8db2edbf 41 // CRC initial value
dudmuck 0:b6ec8db2edbf 42 uint16_t crc = 0x0000;
dudmuck 0:b6ec8db2edbf 43
dudmuck 0:b6ec8db2edbf 44 if( buffer == NULL )
dudmuck 0:b6ec8db2edbf 45 {
dudmuck 0:b6ec8db2edbf 46 return 0;
dudmuck 0:b6ec8db2edbf 47 }
dudmuck 0:b6ec8db2edbf 48
dudmuck 0:b6ec8db2edbf 49 for( uint16_t i = 0; i < length; ++i )
dudmuck 0:b6ec8db2edbf 50 {
dudmuck 0:b6ec8db2edbf 51 crc ^= ( uint16_t ) buffer[i] << 8;
dudmuck 0:b6ec8db2edbf 52 for( uint16_t j = 0; j < 8; ++j )
dudmuck 0:b6ec8db2edbf 53 {
dudmuck 0:b6ec8db2edbf 54 crc = ( crc & 0x8000 ) ? ( crc << 1 ) ^ polynom : ( crc << 1 );
dudmuck 0:b6ec8db2edbf 55 }
dudmuck 0:b6ec8db2edbf 56 }
dudmuck 0:b6ec8db2edbf 57
dudmuck 0:b6ec8db2edbf 58 return crc;
dudmuck 0:b6ec8db2edbf 59 }
dudmuck 0:b6ec8db2edbf 60
dudmuck 0:b6ec8db2edbf 61 void get_alarm()
dudmuck 0:b6ec8db2edbf 62 {
dudmuck 0:b6ec8db2edbf 63 uint16_t rx_crc, crc = crc_ccitt(radio.rx_buf, 5);
dudmuck 0:b6ec8db2edbf 64 rx_crc = radio.rx_buf[5];
dudmuck 0:b6ec8db2edbf 65 rx_crc <<= 8;
dudmuck 0:b6ec8db2edbf 66 rx_crc += radio.rx_buf[6];
dudmuck 0:b6ec8db2edbf 67 //printf("%u) crc rx:%04x, calc:%04x\r\n", lora.RegRxNbBytes, rx_crc, crc);
dudmuck 0:b6ec8db2edbf 68 if (crc == rx_crc) {
dudmuck 0:b6ec8db2edbf 69 if (radio.rx_buf[0] == CMD_ALARM) {
dudmuck 0:b6ec8db2edbf 70 unsigned delay;
dudmuck 0:b6ec8db2edbf 71 delay = radio.rx_buf[1];
dudmuck 0:b6ec8db2edbf 72 delay <<= 8;
dudmuck 0:b6ec8db2edbf 73 delay += radio.rx_buf[2];
dudmuck 0:b6ec8db2edbf 74 delay <<= 8;
dudmuck 0:b6ec8db2edbf 75 delay += radio.rx_buf[3];
dudmuck 0:b6ec8db2edbf 76 delay <<= 8;
dudmuck 0:b6ec8db2edbf 77 delay += radio.rx_buf[4];
dudmuck 0:b6ec8db2edbf 78 to.attach_us(&alarm_pin_set, delay);
dudmuck 0:b6ec8db2edbf 79 printf("delay:%u\r\n", delay);
dudmuck 0:b6ec8db2edbf 80 } else
dudmuck 0:b6ec8db2edbf 81 printf("cmd? %02x\r\n", radio.rx_buf[0]);
dudmuck 0:b6ec8db2edbf 82 } else
dudmuck 0:b6ec8db2edbf 83 printf("crc fail %04x, %04x\r\n", rx_crc, crc);
dudmuck 0:b6ec8db2edbf 84 }
dudmuck 0:b6ec8db2edbf 85
dudmuck 0:b6ec8db2edbf 86 int main()
dudmuck 0:b6ec8db2edbf 87 {
dudmuck 0:b6ec8db2edbf 88 printf("\r\nreset-rx\r\n");
dudmuck 0:b6ec8db2edbf 89 radio.rf_switch = rfsw_callback;
dudmuck 0:b6ec8db2edbf 90
dudmuck 0:b6ec8db2edbf 91 radio.set_frf_MHz(910.8);
dudmuck 0:b6ec8db2edbf 92 lora.enable();
dudmuck 0:b6ec8db2edbf 93 lora.setBw_KHz(500);
dudmuck 0:b6ec8db2edbf 94 lora.setSf(11);
dudmuck 0:b6ec8db2edbf 95
dudmuck 0:b6ec8db2edbf 96 /* RFO or PABOOST choice:
dudmuck 0:b6ec8db2edbf 97 * SX1276 shield: RFO if using 900MHz, or PA_BOOST if using 433MHz
dudmuck 0:b6ec8db2edbf 98 */
dudmuck 0:b6ec8db2edbf 99 rfsw.input();
dudmuck 0:b6ec8db2edbf 100 if (rfsw.read()) {
dudmuck 0:b6ec8db2edbf 101 printf("LAS\r\n");
dudmuck 0:b6ec8db2edbf 102 /* LAS HF=PA_BOOST LF=RFO */
dudmuck 0:b6ec8db2edbf 103 if (radio.HF)
dudmuck 0:b6ec8db2edbf 104 radio.RegPaConfig.bits.PaSelect = 1;
dudmuck 0:b6ec8db2edbf 105 else
dudmuck 0:b6ec8db2edbf 106 radio.RegPaConfig.bits.PaSelect = 0;
dudmuck 0:b6ec8db2edbf 107 } else {
dudmuck 0:b6ec8db2edbf 108 /* MAS shield board, only RFO TX */
dudmuck 0:b6ec8db2edbf 109 radio.RegPaConfig.bits.PaSelect = 0;
dudmuck 0:b6ec8db2edbf 110 printf("MAS\r\n");
dudmuck 0:b6ec8db2edbf 111 }
dudmuck 0:b6ec8db2edbf 112 rfsw.output();
dudmuck 0:b6ec8db2edbf 113 radio.write_reg(REG_PACONFIG, radio.RegPaConfig.octet);
dudmuck 0:b6ec8db2edbf 114
dudmuck 0:b6ec8db2edbf 115 lora.start_rx(RF_OPMODE_RECEIVER);
dudmuck 0:b6ec8db2edbf 116
dudmuck 0:b6ec8db2edbf 117 for (;;) {
dudmuck 0:b6ec8db2edbf 118 if (lora.service() == SERVICE_READ_FIFO) {
dudmuck 0:b6ec8db2edbf 119 /*int i;
dudmuck 0:b6ec8db2edbf 120 for (i = 0; i < lora.RegRxNbBytes; i++) {
dudmuck 0:b6ec8db2edbf 121 printf("%02x ", radio.rx_buf[i]);
dudmuck 0:b6ec8db2edbf 122 }
dudmuck 0:b6ec8db2edbf 123 printf("\r\n");*/
dudmuck 0:b6ec8db2edbf 124 get_alarm();
dudmuck 0:b6ec8db2edbf 125 }
dudmuck 0:b6ec8db2edbf 126 }
dudmuck 0:b6ec8db2edbf 127 }