121 lines
2.5 KiB
C
121 lines
2.5 KiB
C
/* This program is distributed under the GPL, version 2 */
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <ftdi.h>
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#include "soft_uart.h"
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static unsigned char last;
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static struct suart_data su;
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#define CLK_BIT 0x20
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#define RST_BIT 0x08
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#define IO_BIT 0x02
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static void handle_sample(unsigned char c)
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{
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uint8_t rst = 0, io = 0, clk = 0;
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if (c & RST_BIT)
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rst = 1;
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if (c & CLK_BIT)
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clk = 1;
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if (c & IO_BIT)
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io = 1;
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#if 0
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if ((c & 0xf) != last) {
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printf("%02x ", c & ~(CLK_BIT|IO_BIT));
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}
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last = c;
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#endif
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#if 0
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if (c & RST_BIT)
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printf("-");
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else
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printf("_");
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#endif
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#if 1
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if (c & IO_BIT)
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printf("-");
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else
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printf("_");
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#endif
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//suart_process_sample_bit(&su, clk, rst, io);
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}
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#define OVERSAMPLING 4
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int main(int argc, char **argv)
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{
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struct ftdi_context ftdic;
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int f,i;
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unsigned char buf[1<<16];
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//unsigned int sample_rate = 12900 * OVERSAMPLING; /* 192kS/s */
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unsigned int sample_rate = (1 << 18);
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memset(&su, 0, sizeof(su));
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if (ftdi_init(&ftdic) < 0)
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{
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fprintf(stderr, "ftdi_init failed\n");
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return EXIT_FAILURE;
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}
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f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);
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if (f < 0 && f != -5)
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{
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fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
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exit(-1);
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}
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printf("ftdi open succeeded: %d\n",f);
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printf("enabling bitbang mode\n");
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//ftdi_disable_bitbang(&ftdic);
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//ftdi_set_line_property(&ftdic, 8, 1, EVEN);
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ftdi_set_bitmode(&ftdic, 0x0, BITMODE_BITBANG);
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ftdi_read_data_set_chunksize(&ftdic, sizeof(buf));
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ftdi_set_latency_timer(&ftdic, 255);
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//ftdi_set_latency_timer(&ftdic, 1);
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//f = ftdi_set_baudrate(&ftdic, 300000);
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f = ftdi_set_baudrate(&ftdic, sample_rate/16);
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if (f < 0) {
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fprintf(stderr, "error setting baudrate\n");
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exit(1);
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}
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su.samplerate = sample_rate;
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su.recip_etu = sample_rate / OVERSAMPLING;
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su.num_bits = 8;
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suart_init(&su);
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while (1) {
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memset(buf, 0, sizeof(buf));
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f = ftdi_read_data(&ftdic, buf, sizeof(buf));
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if (f < 0) {
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fprintf(stderr,"read failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
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exit(1);
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}
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//printf("ftdi returned %u (of %u)\n", f, sizeof(buf));
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for (i = 0; i < f; i++) {
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handle_sample(buf[i]);
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}
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fflush(stdout);
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//num_samples += f;
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}
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printf("\n");
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printf("disabling bitbang mode\n");
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ftdi_disable_bitbang(&ftdic);
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ftdi_usb_close(&ftdic);
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ftdi_deinit(&ftdic);
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}
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