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https://github.com/Qortal/Brooklyn.git
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562 lines
21 KiB
C++
562 lines
21 KiB
C++
/*
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rpitx_fsk.cpp
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David Rowe July 2020
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FSK modulates an input bit stream using rpitx.
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TODO:
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[X] option for packed/unpacked byte input data
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[ ] Fix operation at Rs<200, at present we can't detect any packets at Rs=100
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[ ] test with other LDPC codes
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+ high rate codes are of interest, big gains for small overhead
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <math.h>
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#include <signal.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "../librpitx/src/librpitx.h"
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#include "ldpc_codes.h"
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#include "freedv_api.h"
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#define MAX_CHAR 256
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#define FIFO_SIZE 100
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// Functions to build FSK_LDPC frame. Not normally exposed by FreeDV API
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extern "C" {
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int freedv_tx_fsk_ldpc_bits_per_frame(struct freedv *f);
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void freedv_tx_fsk_ldpc_framer(struct freedv *f, uint8_t frame[], uint8_t payload_data[]);
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void ofdm_generate_payload_data_bits(uint8_t payload_data_bits[], int n);
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unsigned short freedv_gen_crc16(unsigned char* data_p, int length);
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void freedv_pack(unsigned char *bytes, unsigned char *bits, int nbits);
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void freedv_unpack(unsigned char *bits, unsigned char *bytes, int nbits);
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}
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bool running=true;
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static int terminate_calls = 0;
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ngfmdmasync *fmmod = NULL;
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float initial_frequency = 0.0;
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// Signals like Ctrl-C or segfaults get handled here
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static void terminate(int num) {
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terminate_calls++;
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running=false;
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fprintf(stderr,"Caught signal %d - Terminating\n", num);
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if (terminate_calls >= 5) {
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fprintf(stderr, "Too many signals - finishing....\n");
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fmmod->clkgpio::print_clock_tree();
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// make sure TX is off if we have to abort
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if (fmmod) delete fmmod;
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exit(1);
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}
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}
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/* Use the Linux /sys/class/gpio system to access the RPis GPIOs */
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void sys_gpio(const char filename[], const char s[]) {
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FILE *fgpio = fopen(filename, "wt");
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//fprintf(stderr,"%s %s\n",filename, s);
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if (fgpio == NULL) {
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fprintf(stderr, "\nProblem opening %s\n", filename);
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exit(1);
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}
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fprintf(fgpio,"%s",s);
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fclose(fgpio);
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}
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// calculate and insert CRC in the last 16 bits of (unpacked) data_bits[]
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void calculate_and_insert_crc(uint8_t data_bits[], int data_bits_per_frame) {
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assert((data_bits_per_frame % 8) == 0);
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int data_bytes_per_frame = data_bits_per_frame / 8;
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uint8_t data_bytes[data_bytes_per_frame];
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freedv_pack(data_bytes, data_bits, data_bits_per_frame-16);
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uint16_t crc16 = freedv_gen_crc16(data_bytes, data_bytes_per_frame-2);
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uint8_t crc16_bytes[] = { (uint8_t)(crc16 >> 8), (uint8_t)(crc16 & 0xff) };
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freedv_unpack(data_bits+data_bits_per_frame-16, crc16_bytes, 16);
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}
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/* Sanity check PLLC. During development this was getting modified outside of rpitx.
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Fix is to add "force_turbo=1" to the end of /boot/config.txt */
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#define PLLC_CTRL (0x1120 / 4) // from libpitx/src/gpio.h
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float initial_pllc_freq() {
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volatile uint32_t *gpioreg = fmmod->clkgpio::gpioreg;
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return 19.2 * 1E6 * ((float)(gpioreg[PLLC_CTRL] & 0x3ff) + ((float)gpioreg[PLLC_FRAC]) / ((float)(1 << 20)));
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}
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void check_pllc() {
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volatile uint32_t *gpioreg = fmmod->clkgpio::gpioreg;
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float current_freq = 19.2 * 1E6 * ((float)(gpioreg[PLLC_CTRL] & 0x3ff) + ((float)gpioreg[PLLC_FRAC]) / ((float)(1 << 20)));
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float delta = fabs(current_freq - initial_frequency)/initial_frequency;
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if (delta > 0.01) {
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fprintf(stderr, "PLLC PDIV=%d NDIV=%d FRAC=%d ", (gpioreg[PLLC_CTRL] >> 12)&0x7, gpioreg[PLLC_CTRL] & 0x3ff, gpioreg[PLLC_FRAC]);
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fprintf(stderr, " %f MHz\n", 19.2 * ((float)(gpioreg[PLLC_CTRL] & 0x3ff) + ((float)gpioreg[PLLC_FRAC]) / ((float)(1 << 20))));
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fprintf(stderr, "\nPLLC getting modified outside of rpitx! Add \"force_turbo=1\" to the end of /boot/config.txt\n");
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delete fmmod;
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exit(1);
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}
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}
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// My attempt at a function to send samples to the DMA circular
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// buffer. Not sure if this is any better than ngfmdamsync functions!
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// Interesting area for further work.
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int SetFrequencySampleNonBlocking(ngfmdmasync *fmmod, float Frequency)
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{
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int Index = fmmod->GetUserMemIndex();
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if (Index == -1) {
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return -1;
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} else {
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fmmod->sampletab[Index]=(0x5A<<24)|fmmod->GetMasterFrac(Frequency);
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fmmod->PushSample(Index);
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return 0;
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}
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}
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// FSK Modulate and Tx a frame of bits
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void modulate_frame(ngfmdmasync *fmmod, float shiftHz, int m, uint8_t tx_frame[], int bits_per_frame) {
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assert(fmmod != NULL);
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for(int bit_i=0; bit_i<bits_per_frame;) {
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/* generate the symbol number from the bit stream,
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e.g. 0,1 for 2FSK, 0,1,2,3 for 4FSK */
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int sym = 0;
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for(int i=m; i>>=1; ) {
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uint8_t bit = tx_frame[bit_i] & 0x1;
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sym = (sym<<1)|bit;
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bit_i++;
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}
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float VCOfreqHz = shiftHz*sym;
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while (SetFrequencySampleNonBlocking(fmmod,VCOfreqHz)) usleep(100);
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}
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}
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int main(int argc, char **argv)
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{
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for (int i = 0; i < 64; i++) {
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = terminate;
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sigaction(i, &sa, NULL);
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}
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FILE *fin;
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int carrier_test = 0;
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int one_zero_test = 0;
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float frequency = 144.5e6;
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int SymbolRate = 10000;
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int m = 2;
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int log2m;
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float shiftHz = -1;
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struct freedv *freedv = NULL;
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struct freedv_advanced adv;
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int fsk_ldpc = 0;
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int data_bits_per_frame; // number of payload data bits
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int bits_per_frame; // total number of bits including UW, payload data, parity bits for FSK + LDPC mode
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int testframes = 0;
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int Nframes = 0;
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int Nbursts = 1;
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int sequence_numbers = 0;
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char ant_switch_gpio[128] = "";
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char ant_switch_gpio_path[MAX_CHAR] = "";
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int rpitx_fsk_fifo = 0;
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int packed = 0;
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uint8_t source_byte = 0;
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int inter_burst_delay_ms = 0;
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char usage[] = "usage: %s [-m fskM 2|4] [-f carrierFreqHz] [-r symbRateHz] [-s shiftHz] [-t] [-c] "
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"[--testframes Nframes] InputOneBitPerCharFile\n"
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" -c Carrier test mode\n"
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" -g GPIO that controls antenna Tx/Rx switch (1 for Tx, 0 for Rx)\n"
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" -t ...0101010... FSK test mode\n"
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" --code CodeName Use LDPC code CodeName\n"
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" --listcodes List available LDPC codes\n"
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" --testframes N Send N testframes per burst\n"
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" --bursts B Send B bursts of N testframes (default 1)\n"
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" --delay ms testframe inter-burst delay in ms (default 2 frames)\n"
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" --seq send packet sequence numbers (breaks testframe BER counting) in byte[1]\n"
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" --fifo fifoName send stats messages to fifoName\n"
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" --packed packed byte input\n"
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" --source Byte insert a (non-zero) source address att byte[0]\n"
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"\n"
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" Example 1, send 10000 bits of (100 bit) tests frames from external test frame generator\n"
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" at 1000 bits/s using 2FSK:\n\n"
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" $ ../codec2/build_linux/src/fsk_get_test_bits - 10000 | sudo ./rpitx_fsk - -r 1000 -s 1000\n\n"
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" Example 2, send two LDPC encoded test frames at 1000 bits/s using 2FSK:\n\n"
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" $ sudo ./rpitx_fsk /dev/zero --code H_256_512_4 -r 1000 -s 1000 --testframes 2\n";
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int opt = 0;
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int opt_idx = 0;
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while( opt != -1 ){
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static struct option long_opts[] = {
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{"code", required_argument, 0, 'a'},
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{"listcodes", no_argument, 0, 'b'},
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{"testframes",required_argument, 0, 'u'},
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{"bursts", required_argument, 0, 'e'},
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{"seq", no_argument, 0, 'q'},
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{"fifo", required_argument, 0, 'i'},
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{"packed", no_argument, 0, 'l'},
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{"source", required_argument, 0, 'd'},
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{"delay", required_argument, 0, 'j'},
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{0, 0, 0, 0}
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};
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opt = getopt_long(argc,argv,"a:bcd:e:f:g:i:m:qr:s:tu:",long_opts,&opt_idx);
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switch (opt) {
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case 'a':
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fsk_ldpc = 1;
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adv.codename = optarg;
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break;
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case 'b':
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ldpc_codes_list();
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exit(0);
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break;
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case 'c':
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carrier_test = 1;
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break;
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case 'd':
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source_byte = strtol(optarg, NULL, 0);
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fprintf(stderr,"source byte: 0x%02x\n", source_byte);
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break;
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case 'e':
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Nbursts = atoi(optarg);
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break;
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case 'm':
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m = atoi(optarg);
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break;
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case 'l':
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packed = 1;
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break;
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case 'f':
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frequency = atof(optarg);
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break;
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case 'i':
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rpitx_fsk_fifo = open(optarg, O_WRONLY);
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if (rpitx_fsk_fifo == -1) {
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fprintf(stderr, "Error opening fifo %s\n", argv[2]);
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exit(1);
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}
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fprintf(stderr, "rpitx_fsk: FIFO opened OK ...\n");
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break;
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case 'q':
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sequence_numbers = 1;
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break;
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case 'r':
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SymbolRate = atof(optarg);
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break;
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case 's':
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shiftHz = atof(optarg);
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break;
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case 't':
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one_zero_test = 1;
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break;
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case 'u':
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if (fsk_ldpc == 0) {
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fprintf(stderr, "internal testframe mode only supported in --code coded mode!\n");
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exit(1);
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}
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testframes = 1;
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Nframes = atoi(optarg);
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fprintf(stderr, "rpitx_fsk: Sending %d testframe(s)...\n", Nframes);
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break;
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case 'g':
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strcpy(ant_switch_gpio, optarg);
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sys_gpio("/sys/class/gpio/unexport", ant_switch_gpio);
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sys_gpio("/sys/class/gpio/export", ant_switch_gpio);
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usleep(100*1000); /* short delay so OS can create the next device */
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char tmp[MAX_CHAR];
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sprintf(tmp,"/sys/class/gpio/gpio%s/direction", ant_switch_gpio);
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sys_gpio(tmp, "out");
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sprintf(ant_switch_gpio_path,"/sys/class/gpio/gpio%s/value", ant_switch_gpio);
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sys_gpio(ant_switch_gpio_path, "0");
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break;
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case 'j':
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inter_burst_delay_ms = atoi(optarg);
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break;
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case 'h':
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case '?':
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fprintf(stderr, usage, argv[0]);
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exit(1);
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}
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}
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if (argc < 2) {
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fprintf(stderr, usage, argv[0]);
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exit(1);
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}
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fin = stdin;
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if (!(carrier_test || one_zero_test)) {
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if (strcmp(argv[optind],"-") != 0) {
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fin = fopen(argv[optind],"rb");
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if (fin == NULL) {
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fprintf(stderr, "Error opening input file: %s\n", argv[optind]);
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exit(1);
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}
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}
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}
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int npreamble_symbols = 50*(m>>1);
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int npreamble_bits = npreamble_symbols*(m>>1);
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uint8_t preamble_bits[npreamble_bits];
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if (fsk_ldpc) {
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// setup LDPC encoder and framer
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adv.Rs = SymbolRate;
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adv.Fs = 8*SymbolRate; // just required to satisfy freedv_open FSK_LDPC, as we don't run FSK demod here
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adv.M = m;
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freedv = freedv_open_advanced(FREEDV_MODE_FSK_LDPC, &adv);
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assert(freedv != NULL);
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data_bits_per_frame = freedv_get_bits_per_modem_frame(freedv);
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bits_per_frame = freedv_tx_fsk_ldpc_bits_per_frame(freedv);
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fprintf(stderr, "rpitx_fsk: FSK LDPC mode code: %s data_bits_per_frame: %d\n", adv.codename, data_bits_per_frame);
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/* set up preamble */
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/* TODO: this should be a freeDV API function */
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// cycle through all 2 and 4FSK symbols, not sure if this is better than random
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int sym = 0;
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for(int i=0; i<npreamble_bits; i+=2) {
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preamble_bits[i] = (sym>>1) & 0x1;
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preamble_bits[i+1] = sym & 0x1;
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sym += 1;
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}
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} else {
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// uncoded mode
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data_bits_per_frame = log2(m);
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bits_per_frame = data_bits_per_frame;
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}
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/* Start RpiTX ---------------------------------------------------------------------------------*/
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// Set shiftHz at 2*Rs if no command line argument
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if (shiftHz == -1)
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shiftHz = 2*SymbolRate;
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dbg_setlevel(1);
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fmmod = new ngfmdmasync(frequency,SymbolRate,14,FIFO_SIZE);
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initial_frequency = initial_pllc_freq();
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fmmod->clkgpio::disableclk(4);
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fprintf(stderr, "rpitx_fsk: Frequency: %4.1f MHz Rs: %4.1f kHz Shift: %4.1f kHz M: %d \n", frequency/1E6, SymbolRate/1E3, shiftHz/1E3, m);
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fprintf(stderr, "rpitx_fsk: data_bits_per_frame: %d bits_per_frame: %d\n", data_bits_per_frame, bits_per_frame);
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if ((carrier_test == 0) && (one_zero_test == 0)) {
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// FSK Tx --------------------------------------------------------------------
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uint8_t data_bits[data_bits_per_frame];
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uint8_t tx_frame[bits_per_frame];
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if (testframes) {
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/* FSK_LDPC Tx in test frame mode -------------------------------------------*/
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assert(fsk_ldpc);
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ofdm_generate_payload_data_bits(data_bits, data_bits_per_frame);
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for(int b=0; b<Nbursts; b++) {
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// antenna switch to Tx
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if (*ant_switch_gpio_path) sys_gpio(ant_switch_gpio_path, "1");
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// transmitter carrier on
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fmmod->clkgpio::enableclk(4);
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//fmmod = new ngfmdmasync(frequency,SymbolRate,14,FIFO_SIZE);
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// send pre-amble at start of burst
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modulate_frame(fmmod, shiftHz, m, preamble_bits, npreamble_bits);
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for (int f=0; f<Nframes; f++) {
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// optional injection of source address byte
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if (source_byte) {
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for (int i=0; i<8; i++)
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data_bits[i] = (source_byte >> (7-i)) & 0x1;
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}
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// optional injection of sequence numbers to help locate bad frames
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if (sequence_numbers) {
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int seq = (f+1) & 0xff;
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for (int i=0; i<8; i++)
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data_bits[8+i] = (seq >> (7-i)) & 0x1;
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}
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calculate_and_insert_crc(data_bits, data_bits_per_frame);
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freedv_tx_fsk_ldpc_framer(freedv, tx_frame, data_bits);
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modulate_frame(fmmod, shiftHz, m, tx_frame, bits_per_frame);
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// allow early exit on Crtl-C
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if (!running) goto finished;
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}
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// wait for enough time for FIFO to empty
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int bufferSamples = FIFO_SIZE - fmmod->GetBufferAvailable();
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float tdelay = (float)bufferSamples/SymbolRate;
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usleep((int)(tdelay*1E6));
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fprintf(stderr, "rpitx_fsk: End of burst %d\n", b);
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// transmitter carrier off between bursts
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fmmod->clkgpio::disableclk(4);
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//delete fmmod;
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// antenna switch to Rx
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if (*ant_switch_gpio_path) sys_gpio(ant_switch_gpio_path, "0");
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if (inter_burst_delay_ms == 0) {
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// Two frames delay so we have some interpacket silence
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tdelay = (2.0/SymbolRate)*bits_per_frame/(m>>1);
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} else {
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tdelay = inter_burst_delay_ms/1E3;
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}
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usleep((int)(tdelay*1E6));
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check_pllc();
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}
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}
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else {
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/* regular FSK or FSK_LDPC Tx operation with bits/bytes from stdin ----------------------*/
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int nframes = 0;
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while(1) {
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uint8_t burst_control;
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int nRead;
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if (fsk_ldpc) {
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// in fsk_ldpc mode we prepend input data with a burst control byte
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nRead = fread(&burst_control, sizeof(uint8_t), 1, fin);
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if (nRead == 0) goto finished;
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}
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if (packed) {
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int data_bytes_per_frame = data_bits_per_frame/8;
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uint8_t data_bytes[data_bytes_per_frame];
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nRead = fread(data_bytes, sizeof(uint8_t), data_bytes_per_frame, fin);
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freedv_unpack(data_bits, data_bytes, data_bits_per_frame);
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nRead *= 8;
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}
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else {
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nRead = fread(data_bits, sizeof(uint8_t), data_bits_per_frame, fin);
|
|
}
|
|
|
|
fprintf(stderr, "rpitx_fsk: burst_control: %d nRead: %d\n", burst_control, nRead);
|
|
|
|
if (nRead != data_bits_per_frame) goto finished;
|
|
|
|
if (fsk_ldpc) {
|
|
|
|
// start of burst
|
|
if (burst_control == 1) {
|
|
fprintf(stderr, "rpitx_fsk: Tx on\n");
|
|
// antenna switch to Tx
|
|
if (*ant_switch_gpio_path) sys_gpio(ant_switch_gpio_path, "1");
|
|
// transmitter carrier on
|
|
fmmod->clkgpio::enableclk(4);
|
|
//fmmod = new ngfmdmasync(frequency,SymbolRate,14,FIFO_SIZE);
|
|
// send preamble
|
|
fprintf(stderr, "rpitx_fsk: sending preamble\n");
|
|
modulate_frame(fmmod, shiftHz, m, preamble_bits, npreamble_bits);
|
|
nframes = 0;
|
|
}
|
|
|
|
if ((burst_control == 0) || (burst_control == 1)) {
|
|
fprintf(stderr, "rpitx_fsk: sending frame: %d\n", nframes); nframes++;
|
|
// send a data frame, note last two bytes in frame replaced with CRC
|
|
calculate_and_insert_crc(data_bits, data_bits_per_frame);
|
|
freedv_tx_fsk_ldpc_framer(freedv, tx_frame, data_bits);
|
|
modulate_frame(fmmod, shiftHz, m, tx_frame, bits_per_frame);
|
|
}
|
|
|
|
// end of burst - this has a dummy data frame so don't send
|
|
if (burst_control == 2) {
|
|
// wait for enough time for FIFO to empty
|
|
int bufferSamples = FIFO_SIZE - fmmod->GetBufferAvailable();
|
|
float tdelay = (float)bufferSamples/SymbolRate;
|
|
usleep((int)(tdelay*1E6));
|
|
// transmitter carrier off between bursts
|
|
fmmod->clkgpio::disableclk(4);
|
|
//delete fmmod;
|
|
// antenna switch to Rx
|
|
if (*ant_switch_gpio_path) sys_gpio(ant_switch_gpio_path, "0");
|
|
fprintf(stderr, "rpitx_fsk: Tx off\n");
|
|
if (rpitx_fsk_fifo) {
|
|
char buf[256];
|
|
sprintf(buf, "Tx off");
|
|
if (write(rpitx_fsk_fifo, buf, strlen(buf)+1) ==-1) {
|
|
fprintf(stderr, "rpitx_fsk: error writing to FIFO\n");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// uncoded mode - just send data_bits without any further framing
|
|
memcpy(tx_frame, data_bits, data_bits_per_frame);
|
|
modulate_frame(fmmod, shiftHz, m, tx_frame, bits_per_frame);
|
|
}
|
|
|
|
// allow us to bail on Ctrl-C
|
|
if (!running) goto finished;
|
|
check_pllc();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (carrier_test) {
|
|
fprintf(stderr, "Carrier test mode 1 sec on/off , Ctrl-C to exit\n");
|
|
int count = 0;
|
|
int cycles = 0;
|
|
float VCOfreqHz = 0;
|
|
fmmod->clkgpio::enableclk(4);
|
|
while(running) {
|
|
//fmmod->SetFrequencySamples(&VCOfreqHz,1);
|
|
while (SetFrequencySampleNonBlocking(fmmod, VCOfreqHz)) usleep(100);
|
|
count++;
|
|
if (count == SymbolRate)
|
|
fmmod->clkgpio::disableclk(4);
|
|
if (count == 2*SymbolRate) {
|
|
fmmod->clkgpio::enableclk(4);
|
|
count = 0;
|
|
fprintf(stderr,"\rcycles: %d", ++cycles);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (one_zero_test) {
|
|
fprintf(stderr, "...010101... test mode, Ctrl-C to exit\n");
|
|
float VCOfreqHz = 0;
|
|
fmmod->clkgpio::enableclk(4);
|
|
while(running) {
|
|
if (VCOfreqHz == shiftHz)
|
|
VCOfreqHz = 0;
|
|
else
|
|
VCOfreqHz = shiftHz;
|
|
while (SetFrequencySampleNonBlocking(fmmod, VCOfreqHz)) usleep(100);
|
|
}
|
|
}
|
|
|
|
finished:
|
|
check_pllc();
|
|
fprintf(stderr, "finishing....\n");
|
|
|
|
if (fmmod) delete fmmod;
|
|
if (fsk_ldpc) freedv_close(freedv);
|
|
|
|
if (*ant_switch_gpio) {
|
|
sys_gpio(ant_switch_gpio_path, "0");
|
|
sys_gpio("/sys/class/gpio/unexport", ant_switch_gpio);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|