Devin Alexander / Mbed OS MAX326xxFTHR_LoRa_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 modules.

Dependencies:   BufferedSerial SX1276GenericLib USBDeviceHT max32630fthr

Fork of MAX326xxFTHR_LoRa_PingPong by Devin Alexander

utils.cpp@17:98f2528e8399, 2018-02-23 (annotated)

Committer:
Helmut64
Date:
Fri Feb 23 12:57:25 2018 +0000
Revision:
17:98f2528e8399
Child:
19:9f035b9e65ec
Added Heltec L4 board Pins into PinMap.h; Added USBDevice library to support USBSerial console IO; Moved helper code into utils.cpp; Moved dprintf support with var args and serial or USBSerial output.; Added compile time version support to set RTC to compi...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Helmut64 17:98f2528e8399 1 /*
Helmut64 17:98f2528e8399 2 * Copyright (c) 2018 Helmut Tschemernjak
Helmut64 17:98f2528e8399 3 * 30826 Garbsen (Hannover) Germany
Helmut64 17:98f2528e8399 4 */
Helmut64 17:98f2528e8399 5 #include "main.h"
Helmut64 17:98f2528e8399 6
Helmut64 17:98f2528e8399 7 time_t cvt_date(char const *date, char const *time);
Helmut64 17:98f2528e8399 8
Helmut64 17:98f2528e8399 9 BufferedSerial *ser;
Helmut64 17:98f2528e8399 10 #ifdef FEATURE_USBSERIAL
Helmut64 17:98f2528e8399 11 USBSerialBuffered *usb;
Helmut64 17:98f2528e8399 12 #endif
Helmut64 17:98f2528e8399 13 bool _useDprintf;
Helmut64 17:98f2528e8399 14
Helmut64 17:98f2528e8399 15 void InitSerial(int timeout, DigitalOut *led)
Helmut64 17:98f2528e8399 16 {
Helmut64 17:98f2528e8399 17 _useDprintf = true;
Helmut64 17:98f2528e8399 18 bool uartActive;
Helmut64 17:98f2528e8399 19 {
Helmut64 17:98f2528e8399 20 {
Helmut64 17:98f2528e8399 21 // need to turn rx low to avoid floating signal
Helmut64 17:98f2528e8399 22 DigitalOut rx(USBRX);
Helmut64 17:98f2528e8399 23 rx = 0;
Helmut64 17:98f2528e8399 24 }
Helmut64 17:98f2528e8399 25 DigitalIn uartRX(USBRX);
Helmut64 17:98f2528e8399 26 uartActive = uartRX.read();
Helmut64 17:98f2528e8399 27 }
Helmut64 17:98f2528e8399 28 #ifdef FEATURE_USBSERIAL
Helmut64 17:98f2528e8399 29 if (!uartActive) {
Helmut64 17:98f2528e8399 30 usb = new USBSerialBuffered();
Helmut64 17:98f2528e8399 31 Timer t;
Helmut64 17:98f2528e8399 32 t.start();
Helmut64 17:98f2528e8399 33 while(!usb->connected()) {
Helmut64 17:98f2528e8399 34 if (led)
Helmut64 17:98f2528e8399 35 *led = !*led;
Helmut64 17:98f2528e8399 36 wait_ms(100);
Helmut64 17:98f2528e8399 37 if (timeout) {
Helmut64 17:98f2528e8399 38 if (t.read_ms() >= timeout)
Helmut64 17:98f2528e8399 39 return;
Helmut64 17:98f2528e8399 40 }
Helmut64 17:98f2528e8399 41 }
Helmut64 17:98f2528e8399 42 return;
Helmut64 17:98f2528e8399 43 } else {
Helmut64 17:98f2528e8399 44 #else
Helmut64 17:98f2528e8399 45 {
Helmut64 17:98f2528e8399 46 #endif
Helmut64 17:98f2528e8399 47 ser = new BufferedSerial(USBTX, USBRX);
Helmut64 17:98f2528e8399 48 ser->baud(230400);
Helmut64 17:98f2528e8399 49 ser->format(8);
Helmut64 17:98f2528e8399 50 }
Helmut64 17:98f2528e8399 51 time_t t = cvt_date(__DATE__, __TIME__);
Helmut64 17:98f2528e8399 52 if (t > time(NULL)) {
Helmut64 17:98f2528e8399 53 set_time(t);
Helmut64 17:98f2528e8399 54 }
Helmut64 17:98f2528e8399 55
Helmut64 17:98f2528e8399 56 }
Helmut64 17:98f2528e8399 57
Helmut64 17:98f2528e8399 58 void printTimeStamp()
Helmut64 17:98f2528e8399 59 {
Helmut64 17:98f2528e8399 60 static LowPowerTimer *timer;
Helmut64 17:98f2528e8399 61 if (!timer) {
Helmut64 17:98f2528e8399 62 timer = new LowPowerTimer();
Helmut64 17:98f2528e8399 63 timer->start();
Helmut64 17:98f2528e8399 64 }
Helmut64 17:98f2528e8399 65 time_t seconds = time(NULL);
Helmut64 17:98f2528e8399 66 struct tm *tm = localtime(&seconds);
Helmut64 17:98f2528e8399 67 int usecs = timer->read_us();
Helmut64 17:98f2528e8399 68 if (usecs < 0) {
Helmut64 17:98f2528e8399 69 usecs = 0;
Helmut64 17:98f2528e8399 70 timer->stop();
Helmut64 17:98f2528e8399 71 timer->reset();
Helmut64 17:98f2528e8399 72 timer->start();
Helmut64 17:98f2528e8399 73 }
Helmut64 17:98f2528e8399 74 int msecs = usecs % 1000000;
Helmut64 17:98f2528e8399 75
Helmut64 17:98f2528e8399 76 rprintf("%02d:%02d:%02d.%06d ", tm->tm_hour, tm->tm_min, tm->tm_sec, msecs);
Helmut64 17:98f2528e8399 77 }
Helmut64 17:98f2528e8399 78
Helmut64 17:98f2528e8399 79 void dprintf(const char *format, ...)
Helmut64 17:98f2528e8399 80 {
Helmut64 17:98f2528e8399 81 std::va_list arg;
Helmut64 17:98f2528e8399 82
Helmut64 17:98f2528e8399 83 va_start(arg, format);
Helmut64 17:98f2528e8399 84 VAprintf(true, true, _useDprintf, format, arg);
Helmut64 17:98f2528e8399 85 va_end(arg);
Helmut64 17:98f2528e8399 86 }
Helmut64 17:98f2528e8399 87
Helmut64 17:98f2528e8399 88 void rprintf(const char *format, ...)
Helmut64 17:98f2528e8399 89 {
Helmut64 17:98f2528e8399 90 std::va_list arg;
Helmut64 17:98f2528e8399 91
Helmut64 17:98f2528e8399 92 va_start(arg, format);
Helmut64 17:98f2528e8399 93 VAprintf(false, false, _useDprintf, format, arg);
Helmut64 17:98f2528e8399 94 va_end(arg);
Helmut64 17:98f2528e8399 95 }
Helmut64 17:98f2528e8399 96
Helmut64 17:98f2528e8399 97 void VAprintf(bool timstamp, bool newline, bool printEnabled, const char *format, va_list arg)
Helmut64 17:98f2528e8399 98 {
Helmut64 17:98f2528e8399 99 if (!printEnabled)
Helmut64 17:98f2528e8399 100 return;
Helmut64 17:98f2528e8399 101
Helmut64 17:98f2528e8399 102 if (timstamp)
Helmut64 17:98f2528e8399 103 printTimeStamp();
Helmut64 17:98f2528e8399 104 #ifdef FEATURE_USBSERIAL
Helmut64 17:98f2528e8399 105 if (usb) {
Helmut64 17:98f2528e8399 106 usb->vprintf_irqsafe(format, arg);
Helmut64 17:98f2528e8399 107 if (newline)
Helmut64 17:98f2528e8399 108 usb->printf_irqsafe("\r\n");
Helmut64 17:98f2528e8399 109 #else
Helmut64 17:98f2528e8399 110 if (0) {
Helmut64 17:98f2528e8399 111 #endif
Helmut64 17:98f2528e8399 112 } else if (ser) {
Helmut64 17:98f2528e8399 113 // serial jas
Helmut64 17:98f2528e8399 114 int r = 0;
Helmut64 17:98f2528e8399 115 r = vsnprintf(NULL, 0, format, arg);
Helmut64 17:98f2528e8399 116 if (r < 82) {
Helmut64 17:98f2528e8399 117 char buffer[82+1];
Helmut64 17:98f2528e8399 118
Helmut64 17:98f2528e8399 119 vsnprintf(buffer, sizeof(buffer), format, arg);
Helmut64 17:98f2528e8399 120 r = ser->write(buffer, r);
Helmut64 17:98f2528e8399 121 } else {
Helmut64 17:98f2528e8399 122 char *buffer = new char[r+1];
Helmut64 17:98f2528e8399 123 if (buffer) {
Helmut64 17:98f2528e8399 124 vsnprintf(buffer, r+1, format, arg);
Helmut64 17:98f2528e8399 125 r = ser->write(buffer, r);
Helmut64 17:98f2528e8399 126 delete[] buffer;
Helmut64 17:98f2528e8399 127 } else {
Helmut64 17:98f2528e8399 128 error("%s %d cannot alloc memory (%d bytes)!\r\n", __FILE__, __LINE__, r+1);
Helmut64 17:98f2528e8399 129 r = 0;
Helmut64 17:98f2528e8399 130 }
Helmut64 17:98f2528e8399 131 }
Helmut64 17:98f2528e8399 132 if (newline)
Helmut64 17:98f2528e8399 133 ser->write("\r\n", 2);
Helmut64 17:98f2528e8399 134 }
Helmut64 17:98f2528e8399 135 }
Helmut64 17:98f2528e8399 136
Helmut64 17:98f2528e8399 137
Helmut64 17:98f2528e8399 138 void dump(const char *title, const void *data, int len, bool dwords)
Helmut64 17:98f2528e8399 139 {
Helmut64 17:98f2528e8399 140 dprintf("dump(\"%s\", 0x%x, %d bytes)", title, data, len);
Helmut64 17:98f2528e8399 141
Helmut64 17:98f2528e8399 142 int i, j, cnt;
Helmut64 17:98f2528e8399 143 unsigned char *u;
Helmut64 17:98f2528e8399 144 const int width = 16;
Helmut64 17:98f2528e8399 145 const int seppos = 7;
Helmut64 17:98f2528e8399 146
Helmut64 17:98f2528e8399 147 cnt = 0;
Helmut64 17:98f2528e8399 148 u = (unsigned char *)data;
Helmut64 17:98f2528e8399 149 while (len > 0) {
Helmut64 17:98f2528e8399 150 rprintf("%08x: ", (unsigned int)data + cnt);
Helmut64 17:98f2528e8399 151 if (dwords) {
Helmut64 17:98f2528e8399 152 unsigned int *ip = ( unsigned int *)u;
Helmut64 17:98f2528e8399 153 rprintf(" 0x%08x\r\n", *ip);
Helmut64 17:98f2528e8399 154 u+= 4;
Helmut64 17:98f2528e8399 155 len -= 4;
Helmut64 17:98f2528e8399 156 cnt += 4;
Helmut64 17:98f2528e8399 157 continue;
Helmut64 17:98f2528e8399 158 }
Helmut64 17:98f2528e8399 159 cnt += width;
Helmut64 17:98f2528e8399 160 j = len < width ? len : width;
Helmut64 17:98f2528e8399 161 for (i = 0; i < j; i++) {
Helmut64 17:98f2528e8399 162 rprintf("%2.2x ", *(u + i));
Helmut64 17:98f2528e8399 163 if (i == seppos)
Helmut64 17:98f2528e8399 164 rprintf(" ");
Helmut64 17:98f2528e8399 165 }
Helmut64 17:98f2528e8399 166 rprintf(" ");
Helmut64 17:98f2528e8399 167 if (j < width) {
Helmut64 17:98f2528e8399 168 i = width - j;
Helmut64 17:98f2528e8399 169 if (i > seppos + 1)
Helmut64 17:98f2528e8399 170 rprintf(" ");
Helmut64 17:98f2528e8399 171 while (i--) {
Helmut64 17:98f2528e8399 172 rprintf("%s", " ");
Helmut64 17:98f2528e8399 173 }
Helmut64 17:98f2528e8399 174 }
Helmut64 17:98f2528e8399 175 for (i = 0; i < j; i++) {
Helmut64 17:98f2528e8399 176 int c = *(u + i);
Helmut64 17:98f2528e8399 177 if (c >= ' ' && c <= '~')
Helmut64 17:98f2528e8399 178 rprintf("%c", c);
Helmut64 17:98f2528e8399 179 else
Helmut64 17:98f2528e8399 180 rprintf(".");
Helmut64 17:98f2528e8399 181 if (i == seppos)
Helmut64 17:98f2528e8399 182 rprintf(" ");
Helmut64 17:98f2528e8399 183 }
Helmut64 17:98f2528e8399 184 len -= width;
Helmut64 17:98f2528e8399 185 u += width;
Helmut64 17:98f2528e8399 186 rprintf("\r\n");
Helmut64 17:98f2528e8399 187 }
Helmut64 17:98f2528e8399 188 rprintf("--\r\n");
Helmut64 17:98f2528e8399 189 }
Helmut64 17:98f2528e8399 190
Helmut64 17:98f2528e8399 191 /*
Helmut64 17:98f2528e8399 192 * Convert compile time to system time
Helmut64 17:98f2528e8399 193 */
Helmut64 17:98f2528e8399 194 time_t
Helmut64 17:98f2528e8399 195 cvt_date(char const *date, char const *time)
Helmut64 17:98f2528e8399 196 {
Helmut64 17:98f2528e8399 197 char s_month[5];
Helmut64 17:98f2528e8399 198 int year;
Helmut64 17:98f2528e8399 199 struct tm t;
Helmut64 17:98f2528e8399 200 static const char month_names[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
Helmut64 17:98f2528e8399 201 sscanf(date, "%s %d %d", s_month, &t.tm_mday, &year);
Helmut64 17:98f2528e8399 202 sscanf(time, "%2d %*c %2d %*c %2d", &t.tm_hour, &t.tm_min, &t.tm_sec);
Helmut64 17:98f2528e8399 203 // Find where is s_month in month_names. Deduce month value.
Helmut64 17:98f2528e8399 204 t.tm_mon = (strstr(month_names, s_month) - month_names) / 3;
Helmut64 17:98f2528e8399 205 t.tm_year = year - 1900;
Helmut64 17:98f2528e8399 206 return (int)mktime(&t);
Helmut64 17:98f2528e8399 207 }