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
- Committer:
- dudmuck
- Date:
- 2017-08-31
- Revision:
- 1:6a3a48d657a9
- Parent:
- 0:b6ec8db2edbf
- Child:
- 2:bf201940a9db
File content as of revision 1:6a3a48d657a9:
#include "sx127x_lora.h" DigitalOut myled(LED1); SPI spi(D11, D12, D13); // mosi, miso, sclk // dio0, dio1, nss, spi, rst SX127x radio( D2, D3, D10, spi, A0); // sx1276 arduino shield SX127x_lora lora(radio); DigitalInOut rfsw(A4); // for SX1276 arduino shield void rfsw_callback() { if (radio.RegOpMode.bits.Mode == RF_OPMODE_TRANSMITTER) rfsw = 1; else rfsw = 0; } /**********************************************************************/ DigitalOut pc3(PC_3); DigitalOut pc2(PC_2); DigitalOut pc6(PC_6); DigitalOut pc8(PC_8); DigitalOut* pin; Timeout to; #define PIN_ASSERT_us 500000 #define CMD_PC2 0x02 #define CMD_PC3 0x03 #define CMD_PC6 0x06 #define CMD_PC8 0x08 void alarm_pin_clr() { pin->write(0); } void alarm_pin_set() { pin->write(1); to.attach_us(&alarm_pin_clr, PIN_ASSERT_us); } static uint16_t crc_ccitt( uint8_t *buffer, uint16_t length ) { // The CRC calculation follows CCITT const uint16_t polynom = 0x1021; // CRC initial value uint16_t crc = 0x0000; if( buffer == NULL ) { return 0; } for( uint16_t i = 0; i < length; ++i ) { crc ^= ( uint16_t ) buffer[i] << 8; for( uint16_t j = 0; j < 8; ++j ) { crc = ( crc & 0x8000 ) ? ( crc << 1 ) ^ polynom : ( crc << 1 ); } } return crc; } void get_alarm() { uint16_t rx_crc, crc = crc_ccitt(radio.rx_buf, 5); rx_crc = radio.rx_buf[5]; rx_crc <<= 8; rx_crc += radio.rx_buf[6]; //printf("%u) crc rx:%04x, calc:%04x\r\n", lora.RegRxNbBytes, rx_crc, crc); if (crc == rx_crc) { uint8_t c = radio.rx_buf[0]; //if (radio.rx_buf[0] == CMD_ALARM) if (c == CMD_PC2 || c == CMD_PC3 || c == CMD_PC6 || c == CMD_PC8) { unsigned delay; delay = radio.rx_buf[1]; delay <<= 8; delay += radio.rx_buf[2]; delay <<= 8; delay += radio.rx_buf[3]; delay <<= 8; delay += radio.rx_buf[4]; switch (c) { case CMD_PC2: pin = &pc2; break; case CMD_PC3: pin = &pc3; break; case CMD_PC6: pin = &pc6; break; case CMD_PC8: pin = &pc8; break; } to.attach_us(&alarm_pin_set, delay); printf("delay:%u\r\n", delay); } else printf("cmd? %02x\r\n", radio.rx_buf[0]); } else printf("crc fail %04x, %04x\r\n", rx_crc, crc); } int main() { printf("\r\nreset-rx\r\n"); radio.rf_switch = rfsw_callback; radio.set_frf_MHz(910.8); lora.enable(); lora.setBw_KHz(500); lora.setSf(11); /* RFO or PABOOST choice: * SX1276 shield: RFO if using 900MHz, or PA_BOOST if using 433MHz */ rfsw.input(); if (rfsw.read()) { printf("LAS\r\n"); /* LAS HF=PA_BOOST LF=RFO */ if (radio.HF) radio.RegPaConfig.bits.PaSelect = 1; else radio.RegPaConfig.bits.PaSelect = 0; } else { /* MAS shield board, only RFO TX */ radio.RegPaConfig.bits.PaSelect = 0; printf("MAS\r\n"); } rfsw.output(); radio.write_reg(REG_PACONFIG, radio.RegPaConfig.octet); lora.start_rx(RF_OPMODE_RECEIVER); for (;;) { if (lora.service() == SERVICE_READ_FIFO) { /*int i; for (i = 0; i < lora.RegRxNbBytes; i++) { printf("%02x ", radio.rx_buf[i]); } printf("\r\n");*/ get_alarm(); } } }