May 2021 Commit
Dependencies: sx128x sx12xx_hal
main.cpp@0:cb38da4f4b04, 2017-08-22 (annotated)
- Committer:
- dudmuck
- Date:
- Tue Aug 22 10:06:40 2017 -0700
- Revision:
- 0:cb38da4f4b04
- Child:
- 1:3199506bc2e5
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
dudmuck | 0:cb38da4f4b04 | 1 | #include "sx127x_lora.h" |
dudmuck | 0:cb38da4f4b04 | 2 | |
dudmuck | 0:cb38da4f4b04 | 3 | SPI spi(D11, D12, D13); // mosi, miso, sclk |
dudmuck | 0:cb38da4f4b04 | 4 | // dio0, dio1, nss, spi, rst |
dudmuck | 0:cb38da4f4b04 | 5 | SX127x radio( D2, D3, D10, spi, A0); // sx1276 arduino shield |
dudmuck | 0:cb38da4f4b04 | 6 | |
dudmuck | 0:cb38da4f4b04 | 7 | SX127x_lora lora(radio); |
dudmuck | 0:cb38da4f4b04 | 8 | DigitalInOut rfsw(A4); // for SX1276 arduino shield |
dudmuck | 0:cb38da4f4b04 | 9 | |
dudmuck | 0:cb38da4f4b04 | 10 | void rfsw_callback() |
dudmuck | 0:cb38da4f4b04 | 11 | { |
dudmuck | 0:cb38da4f4b04 | 12 | if (radio.RegOpMode.bits.Mode == RF_OPMODE_TRANSMITTER) { |
dudmuck | 0:cb38da4f4b04 | 13 | rfsw = 1; |
dudmuck | 0:cb38da4f4b04 | 14 | } else { |
dudmuck | 0:cb38da4f4b04 | 15 | rfsw = 0; |
dudmuck | 0:cb38da4f4b04 | 16 | } |
dudmuck | 0:cb38da4f4b04 | 17 | } |
dudmuck | 0:cb38da4f4b04 | 18 | /**********************************************************************/ |
dudmuck | 0:cb38da4f4b04 | 19 | |
dudmuck | 0:cb38da4f4b04 | 20 | DigitalIn user_button(USER_BUTTON); |
dudmuck | 0:cb38da4f4b04 | 21 | Timer t; |
dudmuck | 0:cb38da4f4b04 | 22 | #define CMD_ALARM 0x01 |
dudmuck | 0:cb38da4f4b04 | 23 | |
dudmuck | 0:cb38da4f4b04 | 24 | static uint16_t crc_ccitt( uint8_t *buffer, uint16_t length ) |
dudmuck | 0:cb38da4f4b04 | 25 | { |
dudmuck | 0:cb38da4f4b04 | 26 | // The CRC calculation follows CCITT |
dudmuck | 0:cb38da4f4b04 | 27 | const uint16_t polynom = 0x1021; |
dudmuck | 0:cb38da4f4b04 | 28 | // CRC initial value |
dudmuck | 0:cb38da4f4b04 | 29 | uint16_t crc = 0x0000; |
dudmuck | 0:cb38da4f4b04 | 30 | |
dudmuck | 0:cb38da4f4b04 | 31 | if( buffer == NULL ) |
dudmuck | 0:cb38da4f4b04 | 32 | { |
dudmuck | 0:cb38da4f4b04 | 33 | return 0; |
dudmuck | 0:cb38da4f4b04 | 34 | } |
dudmuck | 0:cb38da4f4b04 | 35 | |
dudmuck | 0:cb38da4f4b04 | 36 | for( uint16_t i = 0; i < length; ++i ) |
dudmuck | 0:cb38da4f4b04 | 37 | { |
dudmuck | 0:cb38da4f4b04 | 38 | crc ^= ( uint16_t ) buffer[i] << 8; |
dudmuck | 0:cb38da4f4b04 | 39 | for( uint16_t j = 0; j < 8; ++j ) |
dudmuck | 0:cb38da4f4b04 | 40 | { |
dudmuck | 0:cb38da4f4b04 | 41 | crc = ( crc & 0x8000 ) ? ( crc << 1 ) ^ polynom : ( crc << 1 ); |
dudmuck | 0:cb38da4f4b04 | 42 | } |
dudmuck | 0:cb38da4f4b04 | 43 | } |
dudmuck | 0:cb38da4f4b04 | 44 | |
dudmuck | 0:cb38da4f4b04 | 45 | return crc; |
dudmuck | 0:cb38da4f4b04 | 46 | } |
dudmuck | 0:cb38da4f4b04 | 47 | |
dudmuck | 0:cb38da4f4b04 | 48 | void transmit(unsigned target) |
dudmuck | 0:cb38da4f4b04 | 49 | { |
dudmuck | 0:cb38da4f4b04 | 50 | unsigned t_diff; |
dudmuck | 0:cb38da4f4b04 | 51 | uint16_t crc; |
dudmuck | 0:cb38da4f4b04 | 52 | |
dudmuck | 0:cb38da4f4b04 | 53 | radio.tx_buf[0] = CMD_ALARM; |
dudmuck | 0:cb38da4f4b04 | 54 | t_diff = target - t.read_us(); |
dudmuck | 0:cb38da4f4b04 | 55 | radio.tx_buf[1] = t_diff >> 24; |
dudmuck | 0:cb38da4f4b04 | 56 | radio.tx_buf[2] = t_diff >> 16; |
dudmuck | 0:cb38da4f4b04 | 57 | radio.tx_buf[3] = t_diff >> 8; |
dudmuck | 0:cb38da4f4b04 | 58 | radio.tx_buf[4] = t_diff & 0xff; |
dudmuck | 0:cb38da4f4b04 | 59 | crc = crc_ccitt(radio.tx_buf, 5); |
dudmuck | 0:cb38da4f4b04 | 60 | radio.tx_buf[5] = crc >> 8; |
dudmuck | 0:cb38da4f4b04 | 61 | radio.tx_buf[6] = crc & 0xff; |
dudmuck | 0:cb38da4f4b04 | 62 | |
dudmuck | 0:cb38da4f4b04 | 63 | |
dudmuck | 0:cb38da4f4b04 | 64 | lora.start_tx(lora.RegPayloadLength); /* begin transmission */ |
dudmuck | 0:cb38da4f4b04 | 65 | |
dudmuck | 0:cb38da4f4b04 | 66 | while (lora.service() != SERVICE_TX_DONE) /* wait for transmission to complete */ |
dudmuck | 0:cb38da4f4b04 | 67 | ; |
dudmuck | 0:cb38da4f4b04 | 68 | |
dudmuck | 0:cb38da4f4b04 | 69 | printf("t_diff:%u crc:%04x\r\n", t_diff, crc); |
dudmuck | 0:cb38da4f4b04 | 70 | } |
dudmuck | 0:cb38da4f4b04 | 71 | |
dudmuck | 0:cb38da4f4b04 | 72 | #define TARGET_LATENCY 2000000 |
dudmuck | 0:cb38da4f4b04 | 73 | void send_alarm() |
dudmuck | 0:cb38da4f4b04 | 74 | { |
dudmuck | 0:cb38da4f4b04 | 75 | int i; |
dudmuck | 0:cb38da4f4b04 | 76 | unsigned target = t.read_us() + TARGET_LATENCY; |
dudmuck | 0:cb38da4f4b04 | 77 | printf("send_alarm() %u\n", target); |
dudmuck | 0:cb38da4f4b04 | 78 | |
dudmuck | 0:cb38da4f4b04 | 79 | for (i = 0; i < 3; i++) { |
dudmuck | 0:cb38da4f4b04 | 80 | transmit(target); |
dudmuck | 0:cb38da4f4b04 | 81 | wait(0.1); |
dudmuck | 0:cb38da4f4b04 | 82 | } |
dudmuck | 0:cb38da4f4b04 | 83 | } |
dudmuck | 0:cb38da4f4b04 | 84 | |
dudmuck | 0:cb38da4f4b04 | 85 | int main() |
dudmuck | 0:cb38da4f4b04 | 86 | { |
dudmuck | 0:cb38da4f4b04 | 87 | printf("\r\nreset-tx\r\n"); |
dudmuck | 0:cb38da4f4b04 | 88 | t.start(); |
dudmuck | 0:cb38da4f4b04 | 89 | radio.rf_switch = rfsw_callback; |
dudmuck | 0:cb38da4f4b04 | 90 | |
dudmuck | 0:cb38da4f4b04 | 91 | radio.set_frf_MHz(910.8); |
dudmuck | 0:cb38da4f4b04 | 92 | lora.enable(); |
dudmuck | 0:cb38da4f4b04 | 93 | lora.setBw_KHz(500); |
dudmuck | 0:cb38da4f4b04 | 94 | lora.setSf(11); |
dudmuck | 0:cb38da4f4b04 | 95 | |
dudmuck | 0:cb38da4f4b04 | 96 | /* RFO or PABOOST choice: |
dudmuck | 0:cb38da4f4b04 | 97 | * SX1276 shield: RFO if using 900MHz, or PA_BOOST if using 433MHz |
dudmuck | 0:cb38da4f4b04 | 98 | */ |
dudmuck | 0:cb38da4f4b04 | 99 | rfsw.input(); |
dudmuck | 0:cb38da4f4b04 | 100 | if (rfsw.read()) { |
dudmuck | 0:cb38da4f4b04 | 101 | printf("LAS\r\n"); |
dudmuck | 0:cb38da4f4b04 | 102 | /* LAS HF=PA_BOOST LF=RFO */ |
dudmuck | 0:cb38da4f4b04 | 103 | if (radio.HF) |
dudmuck | 0:cb38da4f4b04 | 104 | radio.RegPaConfig.bits.PaSelect = 1; |
dudmuck | 0:cb38da4f4b04 | 105 | else |
dudmuck | 0:cb38da4f4b04 | 106 | radio.RegPaConfig.bits.PaSelect = 0; |
dudmuck | 0:cb38da4f4b04 | 107 | } else { |
dudmuck | 0:cb38da4f4b04 | 108 | /* MAS shield board, only RFO TX */ |
dudmuck | 0:cb38da4f4b04 | 109 | radio.RegPaConfig.bits.PaSelect = 0; |
dudmuck | 0:cb38da4f4b04 | 110 | printf("MAS\r\n"); |
dudmuck | 0:cb38da4f4b04 | 111 | } |
dudmuck | 0:cb38da4f4b04 | 112 | rfsw.output(); |
dudmuck | 0:cb38da4f4b04 | 113 | radio.write_reg(REG_PACONFIG, radio.RegPaConfig.octet); |
dudmuck | 0:cb38da4f4b04 | 114 | |
dudmuck | 0:cb38da4f4b04 | 115 | /* constant payload length */ |
dudmuck | 0:cb38da4f4b04 | 116 | lora.RegPayloadLength = 7; |
dudmuck | 0:cb38da4f4b04 | 117 | radio.write_reg(REG_LR_PAYLOADLENGTH, lora.RegPayloadLength); |
dudmuck | 0:cb38da4f4b04 | 118 | |
dudmuck | 0:cb38da4f4b04 | 119 | for (;;) { |
dudmuck | 0:cb38da4f4b04 | 120 | if (!user_button.read()) { |
dudmuck | 0:cb38da4f4b04 | 121 | int i; |
dudmuck | 0:cb38da4f4b04 | 122 | for (i = 0; i < 5; i++) { |
dudmuck | 0:cb38da4f4b04 | 123 | wait(0.01); |
dudmuck | 0:cb38da4f4b04 | 124 | if (user_button.read()) { |
dudmuck | 0:cb38da4f4b04 | 125 | printf("trans\r\n"); |
dudmuck | 0:cb38da4f4b04 | 126 | break; |
dudmuck | 0:cb38da4f4b04 | 127 | } |
dudmuck | 0:cb38da4f4b04 | 128 | } |
dudmuck | 0:cb38da4f4b04 | 129 | if (i == 5) |
dudmuck | 0:cb38da4f4b04 | 130 | send_alarm(); |
dudmuck | 0:cb38da4f4b04 | 131 | |
dudmuck | 0:cb38da4f4b04 | 132 | while (!user_button.read()) |
dudmuck | 0:cb38da4f4b04 | 133 | ; |
dudmuck | 0:cb38da4f4b04 | 134 | } |
dudmuck | 0:cb38da4f4b04 | 135 | |
dudmuck | 0:cb38da4f4b04 | 136 | } // ..for (;;) |
dudmuck | 0:cb38da4f4b04 | 137 | } |