Devin Alexander / Mbed OS MAX326xxFTHR_LoRa_RFM95_PingPong_Example

This program is guided to help establish a connection between two RFM95 900MHz LoRa radio modules using Maxim Integrated's Feather MCUs (MAX32630FTHR Mbed and the MAX32620FTHR Mbed). Once the radios are configured after powering on and if the radios are wired correctly, the two radios will self identify as either a master or a slave, and will then proceed to PING and PONG back and forth. Information about what is happening between the radios can be seen if the two boards are hooked up to a USB COM port through the included DAPLINK/MAX32625PICO modules.

Dependencies:   BufferedSerial SX1276GenericLib USBDeviceHT max32630fthr

Fork of MAX326xxFTHR_LoRa_PingPong by Devin Alexander

main.cpp@8:3b0d7b4ff28f, 2017-05-19 (annotated)

Committer:
Helmut64
Date:
Fri May 19 14:04:56 2017 +0000
Revision:
8:3b0d7b4ff28f
Parent:
0:c43b6919ae15
Child:
13:5a32a1922fbc
Updated description.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Helmut64 0:c43b6919ae15 1 /*
Helmut64 0:c43b6919ae15 2 * Copyright (c) 2017 Helmut Tschemernjak
Helmut64 0:c43b6919ae15 3 * 30826 Garbsen (Hannover) Germany
Helmut64 0:c43b6919ae15 4 * Licensed under the Apache License, Version 2.0);
Helmut64 0:c43b6919ae15 5 */
Helmut64 0:c43b6919ae15 6 #include "main.h"
Helmut64 0:c43b6919ae15 7
Helmut64 8:3b0d7b4ff28f 8 /*
Helmut64 8:3b0d7b4ff28f 9 * IMPORTANT NOTE
Helmut64 8:3b0d7b4ff28f 10 * Use the Nucleo-L073RZ target for the STM B_L072Z_LRWAN1 LoRa board
Helmut64 8:3b0d7b4ff28f 11 */
Helmut64 0:c43b6919ae15 12 DigitalOut myled(LED1);
Helmut64 0:c43b6919ae15 13 BufferedSerial *ser;
Helmut64 0:c43b6919ae15 14
Helmut64 0:c43b6919ae15 15 int main() {
Helmut64 0:c43b6919ae15 16 SystemClock_Config();
Helmut64 0:c43b6919ae15 17 ser = new BufferedSerial(USBTX, USBRX);
Helmut64 0:c43b6919ae15 18 ser->baud(115200*2);
Helmut64 0:c43b6919ae15 19 ser->format(8);
Helmut64 0:c43b6919ae15 20 ser->printf("Hello World\n\r");
Helmut64 0:c43b6919ae15 21 myled = 1;
Helmut64 0:c43b6919ae15 22
Helmut64 0:c43b6919ae15 23 SX1276PingPong();
Helmut64 0:c43b6919ae15 24 }
Helmut64 0:c43b6919ae15 25
Helmut64 0:c43b6919ae15 26
Helmut64 0:c43b6919ae15 27
Helmut64 0:c43b6919ae15 28
Helmut64 0:c43b6919ae15 29 void SystemClock_Config(void)
Helmut64 0:c43b6919ae15 30 {
Helmut64 0:c43b6919ae15 31 #ifdef B_L072Z_LRWAN1_LORA
Helmut64 0:c43b6919ae15 32 /*
Helmut64 0:c43b6919ae15 33 * The L072Z_LRWAN1_LORA clock setup is somewhat differnt from the Nucleo board.
Helmut64 0:c43b6919ae15 34 * It has no LSE.
Helmut64 0:c43b6919ae15 35 */
Helmut64 0:c43b6919ae15 36 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
Helmut64 0:c43b6919ae15 37 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
Helmut64 0:c43b6919ae15 38
Helmut64 0:c43b6919ae15 39 /* Enable HSE Oscillator and Activate PLL with HSE as source */
Helmut64 0:c43b6919ae15 40 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
Helmut64 0:c43b6919ae15 41 RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
Helmut64 0:c43b6919ae15 42 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
Helmut64 0:c43b6919ae15 43 RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
Helmut64 0:c43b6919ae15 44 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
Helmut64 0:c43b6919ae15 45 RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
Helmut64 0:c43b6919ae15 46 RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_6;
Helmut64 0:c43b6919ae15 47 RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_3;
Helmut64 0:c43b6919ae15 48
Helmut64 0:c43b6919ae15 49 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
Helmut64 0:c43b6919ae15 50 // Error_Handler();
Helmut64 0:c43b6919ae15 51 }
Helmut64 0:c43b6919ae15 52
Helmut64 0:c43b6919ae15 53 /* Set Voltage scale1 as MCU will run at 32MHz */
Helmut64 0:c43b6919ae15 54 __HAL_RCC_PWR_CLK_ENABLE();
Helmut64 0:c43b6919ae15 55 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
Helmut64 0:c43b6919ae15 56
Helmut64 0:c43b6919ae15 57 /* Poll VOSF bit of in PWR_CSR. Wait until it is reset to 0 */
Helmut64 0:c43b6919ae15 58 while (__HAL_PWR_GET_FLAG(PWR_FLAG_VOS) != RESET) {};
Helmut64 0:c43b6919ae15 59
Helmut64 0:c43b6919ae15 60 /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
Helmut64 0:c43b6919ae15 61 clocks dividers */
Helmut64 0:c43b6919ae15 62 RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
Helmut64 0:c43b6919ae15 63 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
Helmut64 0:c43b6919ae15 64 RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
Helmut64 0:c43b6919ae15 65 RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
Helmut64 0:c43b6919ae15 66 RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
Helmut64 0:c43b6919ae15 67 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
Helmut64 0:c43b6919ae15 68 // Error_Handler();
Helmut64 0:c43b6919ae15 69 }
Helmut64 0:c43b6919ae15 70 #endif
Helmut64 0:c43b6919ae15 71 }
Helmut64 0:c43b6919ae15 72
Helmut64 0:c43b6919ae15 73 void dump(const char *title, const void *data, int len, bool dwords)
Helmut64 0:c43b6919ae15 74 {
Helmut64 0:c43b6919ae15 75 dprintf("dump(\"%s\", 0x%x, %d bytes)", title, data, len);
Helmut64 0:c43b6919ae15 76
Helmut64 0:c43b6919ae15 77 int i, j, cnt;
Helmut64 0:c43b6919ae15 78 unsigned char *u;
Helmut64 0:c43b6919ae15 79 const int width = 16;
Helmut64 0:c43b6919ae15 80 const int seppos = 7;
Helmut64 0:c43b6919ae15 81
Helmut64 0:c43b6919ae15 82 cnt = 0;
Helmut64 0:c43b6919ae15 83 u = (unsigned char *)data;
Helmut64 0:c43b6919ae15 84 while (len > 0) {
Helmut64 0:c43b6919ae15 85 ser->printf("%08x: ", (unsigned int)data + cnt);
Helmut64 0:c43b6919ae15 86 if (dwords) {
Helmut64 0:c43b6919ae15 87 unsigned int *ip = ( unsigned int *)u;
Helmut64 0:c43b6919ae15 88 ser->printf(" 0x%08x\r\n", *ip);
Helmut64 0:c43b6919ae15 89 u+= 4;
Helmut64 0:c43b6919ae15 90 len -= 4;
Helmut64 0:c43b6919ae15 91 cnt += 4;
Helmut64 0:c43b6919ae15 92 continue;
Helmut64 0:c43b6919ae15 93 }
Helmut64 0:c43b6919ae15 94 cnt += width;
Helmut64 0:c43b6919ae15 95 j = len < width ? len : width;
Helmut64 0:c43b6919ae15 96 for (i = 0; i < j; i++) {
Helmut64 0:c43b6919ae15 97 ser->printf("%2.2x ", *(u + i));
Helmut64 0:c43b6919ae15 98 if (i == seppos)
Helmut64 0:c43b6919ae15 99 ser->putc(' ');
Helmut64 0:c43b6919ae15 100 }
Helmut64 0:c43b6919ae15 101 ser->putc(' ');
Helmut64 0:c43b6919ae15 102 if (j < width) {
Helmut64 0:c43b6919ae15 103 i = width - j;
Helmut64 0:c43b6919ae15 104 if (i > seppos + 1)
Helmut64 0:c43b6919ae15 105 ser->putc(' ');
Helmut64 0:c43b6919ae15 106 while (i--) {
Helmut64 0:c43b6919ae15 107 printf("%s", " ");
Helmut64 0:c43b6919ae15 108 }
Helmut64 0:c43b6919ae15 109 }
Helmut64 0:c43b6919ae15 110 for (i = 0; i < j; i++) {
Helmut64 0:c43b6919ae15 111 int c = *(u + i);
Helmut64 0:c43b6919ae15 112 if (c >= ' ' && c <= '~')
Helmut64 0:c43b6919ae15 113 ser->putc(c);
Helmut64 0:c43b6919ae15 114 else
Helmut64 0:c43b6919ae15 115 ser->putc('.');
Helmut64 0:c43b6919ae15 116 if (i == seppos)
Helmut64 0:c43b6919ae15 117 ser->putc(' ');
Helmut64 0:c43b6919ae15 118 }
Helmut64 0:c43b6919ae15 119 len -= width;
Helmut64 0:c43b6919ae15 120 u += width;
Helmut64 0:c43b6919ae15 121 ser->printf("\r\n");
Helmut64 0:c43b6919ae15 122 }
Helmut64 0:c43b6919ae15 123 ser->printf("--\r\n");
Helmut64 0:c43b6919ae15 124 }