Alarm generator, transmitter side
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.
This is transmitter project; Receiver side is Alarm Slave project.
This project generates alarm (transmits) from grounding certain pins.
To find the actual pins used, refer to the code where pin[A-D]
is declared as DigitalIn
.
Alarm message is sent N times with future timestamp indicating when alarm is to occur. This accommodates dropped packets, resulting in alarm occurring when as few as 1 packet is received.
main.cpp@6:59ba1113b3c6, 2018-02-12 (annotated)
- Committer:
- Wayne Roberts
- Date:
- Mon Feb 12 17:23:14 2018 -0800
- Revision:
- 6:59ba1113b3c6
- Parent:
- 5:1652e04809fb
- Child:
- 7:ccb3088ce5be
MOTE_L152RC set pd2 high
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Wayne Roberts |
6:59ba1113b3c6 | 1 | #include "user_platform.h" |
dudmuck | 0:cb38da4f4b04 | 2 | |
dudmuck | 3:d8b57eca8c45 | 3 | SX127x_lora lora(radio); |
dudmuck | 0:cb38da4f4b04 | 4 | Timer t; |
dudmuck | 3:d8b57eca8c45 | 5 | #define CMD_PINA 0x02 |
dudmuck | 3:d8b57eca8c45 | 6 | #define CMD_PINB 0x03 |
dudmuck | 3:d8b57eca8c45 | 7 | #define CMD_PINC 0x06 |
dudmuck | 3:d8b57eca8c45 | 8 | #define CMD_PIND 0x08 |
dudmuck | 0:cb38da4f4b04 | 9 | |
dudmuck | 0:cb38da4f4b04 | 10 | static uint16_t crc_ccitt( uint8_t *buffer, uint16_t length ) |
dudmuck | 0:cb38da4f4b04 | 11 | { |
dudmuck | 0:cb38da4f4b04 | 12 | // The CRC calculation follows CCITT |
dudmuck | 0:cb38da4f4b04 | 13 | const uint16_t polynom = 0x1021; |
dudmuck | 0:cb38da4f4b04 | 14 | // CRC initial value |
dudmuck | 0:cb38da4f4b04 | 15 | uint16_t crc = 0x0000; |
dudmuck | 0:cb38da4f4b04 | 16 | |
dudmuck | 0:cb38da4f4b04 | 17 | if( buffer == NULL ) |
dudmuck | 0:cb38da4f4b04 | 18 | { |
dudmuck | 0:cb38da4f4b04 | 19 | return 0; |
dudmuck | 0:cb38da4f4b04 | 20 | } |
dudmuck | 0:cb38da4f4b04 | 21 | |
dudmuck | 0:cb38da4f4b04 | 22 | for( uint16_t i = 0; i < length; ++i ) |
dudmuck | 0:cb38da4f4b04 | 23 | { |
dudmuck | 0:cb38da4f4b04 | 24 | crc ^= ( uint16_t ) buffer[i] << 8; |
dudmuck | 0:cb38da4f4b04 | 25 | for( uint16_t j = 0; j < 8; ++j ) |
dudmuck | 0:cb38da4f4b04 | 26 | { |
dudmuck | 0:cb38da4f4b04 | 27 | crc = ( crc & 0x8000 ) ? ( crc << 1 ) ^ polynom : ( crc << 1 ); |
dudmuck | 0:cb38da4f4b04 | 28 | } |
dudmuck | 0:cb38da4f4b04 | 29 | } |
dudmuck | 0:cb38da4f4b04 | 30 | |
dudmuck | 0:cb38da4f4b04 | 31 | return crc; |
dudmuck | 0:cb38da4f4b04 | 32 | } |
dudmuck | 0:cb38da4f4b04 | 33 | |
dudmuck | 1:3199506bc2e5 | 34 | void transmit(unsigned target, uint8_t cmd) |
dudmuck | 0:cb38da4f4b04 | 35 | { |
dudmuck | 0:cb38da4f4b04 | 36 | unsigned t_diff; |
dudmuck | 0:cb38da4f4b04 | 37 | uint16_t crc; |
dudmuck | 0:cb38da4f4b04 | 38 | |
dudmuck | 1:3199506bc2e5 | 39 | radio.tx_buf[0] = cmd; |
dudmuck | 0:cb38da4f4b04 | 40 | t_diff = target - t.read_us(); |
dudmuck | 0:cb38da4f4b04 | 41 | radio.tx_buf[1] = t_diff >> 24; |
dudmuck | 0:cb38da4f4b04 | 42 | radio.tx_buf[2] = t_diff >> 16; |
dudmuck | 0:cb38da4f4b04 | 43 | radio.tx_buf[3] = t_diff >> 8; |
dudmuck | 0:cb38da4f4b04 | 44 | radio.tx_buf[4] = t_diff & 0xff; |
dudmuck | 0:cb38da4f4b04 | 45 | crc = crc_ccitt(radio.tx_buf, 5); |
dudmuck | 0:cb38da4f4b04 | 46 | radio.tx_buf[5] = crc >> 8; |
dudmuck | 0:cb38da4f4b04 | 47 | radio.tx_buf[6] = crc & 0xff; |
dudmuck | 0:cb38da4f4b04 | 48 | |
dudmuck | 0:cb38da4f4b04 | 49 | |
dudmuck | 0:cb38da4f4b04 | 50 | lora.start_tx(lora.RegPayloadLength); /* begin transmission */ |
dudmuck | 0:cb38da4f4b04 | 51 | |
dudmuck | 1:3199506bc2e5 | 52 | while (lora.service() != SERVICE_TX_DONE) { /* wait for transmission to complete */ |
dudmuck | 1:3199506bc2e5 | 53 | } |
dudmuck | 0:cb38da4f4b04 | 54 | |
dudmuck | 0:cb38da4f4b04 | 55 | printf("t_diff:%u crc:%04x\r\n", t_diff, crc); |
dudmuck | 0:cb38da4f4b04 | 56 | } |
dudmuck | 0:cb38da4f4b04 | 57 | |
dudmuck | 0:cb38da4f4b04 | 58 | #define TARGET_LATENCY 2000000 |
dudmuck | 1:3199506bc2e5 | 59 | void send_alarm(uint8_t cmd) |
dudmuck | 0:cb38da4f4b04 | 60 | { |
dudmuck | 0:cb38da4f4b04 | 61 | int i; |
dudmuck | 0:cb38da4f4b04 | 62 | unsigned target = t.read_us() + TARGET_LATENCY; |
dudmuck | 0:cb38da4f4b04 | 63 | printf("send_alarm() %u\n", target); |
dudmuck | 0:cb38da4f4b04 | 64 | |
dudmuck | 1:3199506bc2e5 | 65 | for (i = 0; i < 5; i++) { |
dudmuck | 1:3199506bc2e5 | 66 | transmit(target, cmd); |
dudmuck | 0:cb38da4f4b04 | 67 | wait(0.1); |
dudmuck | 0:cb38da4f4b04 | 68 | } |
dudmuck | 0:cb38da4f4b04 | 69 | } |
dudmuck | 1:3199506bc2e5 | 70 | |
dudmuck | 1:3199506bc2e5 | 71 | void debounce(DigitalIn* pin, uint8_t cmd) |
dudmuck | 1:3199506bc2e5 | 72 | { |
dudmuck | 1:3199506bc2e5 | 73 | if (!pin->read()) { |
dudmuck | 1:3199506bc2e5 | 74 | int i; |
dudmuck | 1:3199506bc2e5 | 75 | for (i = 0; i < 5; i++) { |
dudmuck | 1:3199506bc2e5 | 76 | wait(0.01); |
dudmuck | 1:3199506bc2e5 | 77 | if (pin->read()) { |
dudmuck | 1:3199506bc2e5 | 78 | printf("trans\r\n"); |
dudmuck | 1:3199506bc2e5 | 79 | break; |
dudmuck | 1:3199506bc2e5 | 80 | } |
dudmuck | 1:3199506bc2e5 | 81 | } |
dudmuck | 1:3199506bc2e5 | 82 | if (i == 5) |
dudmuck | 1:3199506bc2e5 | 83 | send_alarm(cmd); |
dudmuck | 1:3199506bc2e5 | 84 | |
dudmuck | 1:3199506bc2e5 | 85 | while (!pin->read()) |
dudmuck | 1:3199506bc2e5 | 86 | ; |
dudmuck | 1:3199506bc2e5 | 87 | } |
dudmuck | 1:3199506bc2e5 | 88 | } |
dudmuck | 2:0b7620bda2c9 | 89 | |
dudmuck | 4:19056d9707ef | 90 | void cmd_ocp(uint8_t ma) |
dudmuck | 4:19056d9707ef | 91 | { |
dudmuck | 4:19056d9707ef | 92 | if (ma < 130) |
dudmuck | 4:19056d9707ef | 93 | radio.RegOcp.bits.OcpTrim = (ma - 45) / 5; |
dudmuck | 4:19056d9707ef | 94 | else |
dudmuck | 4:19056d9707ef | 95 | radio.RegOcp.bits.OcpTrim = (ma + 30) / 10; |
dudmuck | 4:19056d9707ef | 96 | radio.write_reg(REG_OCP, radio.RegOcp.octet); |
dudmuck | 4:19056d9707ef | 97 | |
dudmuck | 4:19056d9707ef | 98 | radio.RegOcp.octet = radio.read_reg(REG_OCP); |
dudmuck | 4:19056d9707ef | 99 | if (radio.RegOcp.bits.OcpTrim < 16) |
dudmuck | 4:19056d9707ef | 100 | ma = 45 + (5 * radio.RegOcp.bits.OcpTrim); |
dudmuck | 4:19056d9707ef | 101 | else if (radio.RegOcp.bits.OcpTrim < 28) |
dudmuck | 4:19056d9707ef | 102 | ma = (10 * radio.RegOcp.bits.OcpTrim) - 30; |
dudmuck | 4:19056d9707ef | 103 | else |
dudmuck | 4:19056d9707ef | 104 | ma = 240; |
dudmuck | 4:19056d9707ef | 105 | printf("Ocp: %dmA\r\n", ma); |
dudmuck | 4:19056d9707ef | 106 | } |
dudmuck | 4:19056d9707ef | 107 | |
dudmuck | 0:cb38da4f4b04 | 108 | int main() |
dudmuck | 0:cb38da4f4b04 | 109 | { |
dudmuck | 0:cb38da4f4b04 | 110 | printf("\r\nreset-tx\r\n"); |
dudmuck | 0:cb38da4f4b04 | 111 | t.start(); |
dudmuck | 1:3199506bc2e5 | 112 | |
dudmuck | 3:d8b57eca8c45 | 113 | pinA.mode(PullUp); |
dudmuck | 3:d8b57eca8c45 | 114 | pinB.mode(PullUp); |
dudmuck | 3:d8b57eca8c45 | 115 | pinC.mode(PullUp); |
dudmuck | 3:d8b57eca8c45 | 116 | pinD.mode(PullUp); |
dudmuck | 1:3199506bc2e5 | 117 | |
dudmuck | 0:cb38da4f4b04 | 118 | radio.rf_switch = rfsw_callback; |
dudmuck | 0:cb38da4f4b04 | 119 | |
dudmuck | 0:cb38da4f4b04 | 120 | radio.set_frf_MHz(910.8); |
dudmuck | 0:cb38da4f4b04 | 121 | lora.enable(); |
dudmuck | 0:cb38da4f4b04 | 122 | lora.setBw_KHz(500); |
dudmuck | 0:cb38da4f4b04 | 123 | lora.setSf(11); |
dudmuck | 0:cb38da4f4b04 | 124 | |
Wayne Roberts |
5:1652e04809fb | 125 | board_init(); |
dudmuck | 0:cb38da4f4b04 | 126 | |
dudmuck | 0:cb38da4f4b04 | 127 | /* constant payload length */ |
dudmuck | 0:cb38da4f4b04 | 128 | lora.RegPayloadLength = 7; |
dudmuck | 0:cb38da4f4b04 | 129 | radio.write_reg(REG_LR_PAYLOADLENGTH, lora.RegPayloadLength); |
dudmuck | 4:19056d9707ef | 130 | |
dudmuck | 4:19056d9707ef | 131 | /* lora.RegModemConfig2.octet = radio.read_reg(REG_LR_MODEMCONFIG2); |
dudmuck | 4:19056d9707ef | 132 | lora.RegModemConfig2.sx1276bits.TxContinuousMode = 1; |
dudmuck | 4:19056d9707ef | 133 | radio.write_reg(REG_LR_MODEMCONFIG2, lora.RegModemConfig2.octet); |
dudmuck | 4:19056d9707ef | 134 | */ |
dudmuck | 0:cb38da4f4b04 | 135 | for (;;) { |
dudmuck | 3:d8b57eca8c45 | 136 | debounce(&pinA, CMD_PINA); |
dudmuck | 3:d8b57eca8c45 | 137 | debounce(&pinB, CMD_PINB); |
dudmuck | 3:d8b57eca8c45 | 138 | debounce(&pinC, CMD_PINC); |
dudmuck | 3:d8b57eca8c45 | 139 | debounce(&pinD, CMD_PIND); |
dudmuck | 0:cb38da4f4b04 | 140 | } // ..for (;;) |
dudmuck | 0:cb38da4f4b04 | 141 | } |