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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
utils.cpp
- Committer:
- Helmut64
- Date:
- 2018-02-23
- Revision:
- 17:98f2528e8399
- Child:
- 19:9f035b9e65ec
File content as of revision 17:98f2528e8399:
/* * Copyright (c) 2018 Helmut Tschemernjak * 30826 Garbsen (Hannover) Germany */ #include "main.h" time_t cvt_date(char const *date, char const *time); BufferedSerial *ser; #ifdef FEATURE_USBSERIAL USBSerialBuffered *usb; #endif bool _useDprintf; void InitSerial(int timeout, DigitalOut *led) { _useDprintf = true; bool uartActive; { { // need to turn rx low to avoid floating signal DigitalOut rx(USBRX); rx = 0; } DigitalIn uartRX(USBRX); uartActive = uartRX.read(); } #ifdef FEATURE_USBSERIAL if (!uartActive) { usb = new USBSerialBuffered(); Timer t; t.start(); while(!usb->connected()) { if (led) *led = !*led; wait_ms(100); if (timeout) { if (t.read_ms() >= timeout) return; } } return; } else { #else { #endif ser = new BufferedSerial(USBTX, USBRX); ser->baud(230400); ser->format(8); } time_t t = cvt_date(__DATE__, __TIME__); if (t > time(NULL)) { set_time(t); } } void printTimeStamp() { static LowPowerTimer *timer; if (!timer) { timer = new LowPowerTimer(); timer->start(); } time_t seconds = time(NULL); struct tm *tm = localtime(&seconds); int usecs = timer->read_us(); if (usecs < 0) { usecs = 0; timer->stop(); timer->reset(); timer->start(); } int msecs = usecs % 1000000; rprintf("%02d:%02d:%02d.%06d ", tm->tm_hour, tm->tm_min, tm->tm_sec, msecs); } void dprintf(const char *format, ...) { std::va_list arg; va_start(arg, format); VAprintf(true, true, _useDprintf, format, arg); va_end(arg); } void rprintf(const char *format, ...) { std::va_list arg; va_start(arg, format); VAprintf(false, false, _useDprintf, format, arg); va_end(arg); } void VAprintf(bool timstamp, bool newline, bool printEnabled, const char *format, va_list arg) { if (!printEnabled) return; if (timstamp) printTimeStamp(); #ifdef FEATURE_USBSERIAL if (usb) { usb->vprintf_irqsafe(format, arg); if (newline) usb->printf_irqsafe("\r\n"); #else if (0) { #endif } else if (ser) { // serial jas int r = 0; r = vsnprintf(NULL, 0, format, arg); if (r < 82) { char buffer[82+1]; vsnprintf(buffer, sizeof(buffer), format, arg); r = ser->write(buffer, r); } else { char *buffer = new char[r+1]; if (buffer) { vsnprintf(buffer, r+1, format, arg); r = ser->write(buffer, r); delete[] buffer; } else { error("%s %d cannot alloc memory (%d bytes)!\r\n", __FILE__, __LINE__, r+1); r = 0; } } if (newline) ser->write("\r\n", 2); } } void dump(const char *title, const void *data, int len, bool dwords) { dprintf("dump(\"%s\", 0x%x, %d bytes)", title, data, len); int i, j, cnt; unsigned char *u; const int width = 16; const int seppos = 7; cnt = 0; u = (unsigned char *)data; while (len > 0) { rprintf("%08x: ", (unsigned int)data + cnt); if (dwords) { unsigned int *ip = ( unsigned int *)u; rprintf(" 0x%08x\r\n", *ip); u+= 4; len -= 4; cnt += 4; continue; } cnt += width; j = len < width ? len : width; for (i = 0; i < j; i++) { rprintf("%2.2x ", *(u + i)); if (i == seppos) rprintf(" "); } rprintf(" "); if (j < width) { i = width - j; if (i > seppos + 1) rprintf(" "); while (i--) { rprintf("%s", " "); } } for (i = 0; i < j; i++) { int c = *(u + i); if (c >= ' ' && c <= '~') rprintf("%c", c); else rprintf("."); if (i == seppos) rprintf(" "); } len -= width; u += width; rprintf("\r\n"); } rprintf("--\r\n"); } /* * Convert compile time to system time */ time_t cvt_date(char const *date, char const *time) { char s_month[5]; int year; struct tm t; static const char month_names[] = "JanFebMarAprMayJunJulAugSepOctNovDec"; sscanf(date, "%s %d %d", s_month, &t.tm_mday, &year); sscanf(time, "%2d %*c %2d %*c %2d", &t.tm_hour, &t.tm_min, &t.tm_sec); // Find where is s_month in month_names. Deduce month value. t.tm_mon = (strstr(month_names, s_month) - month_names) / 3; t.tm_year = year - 1900; return (int)mktime(&t); }