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git://projects.qi-hardware.com/ben-blinkenlights.git
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ubb-patgen/ubb-patgen.c: new option -t 0|1 to start pattern on TRIGGER/CLK
The trigger delay is typically in the order of 2 us but, since we're not disabling interrupts or such, could also be much larger.
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10b0dea29c
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@ -310,7 +310,7 @@ static void wait_shifted(const struct mmcclk *clk)
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static void mmc_buffer(const struct mmcclk *clk,
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uint8_t first, unsigned long buf, int nibbles, uint32_t mask)
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uint8_t first, unsigned long buf, int nibbles, uint32_t mask, int trigger)
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{
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/*
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* If under control of the MMC controller, DATx tri-state until we
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@ -355,6 +355,9 @@ static void mmc_buffer(const struct mmcclk *clk,
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PDFUNS = mask;
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if (trigger != -1)
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while (PIN(UBB_CLK) != trigger);
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/*
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* Send the pattern with DMA. Note that we still have to send the first
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* pattern, since the static state we begin from may not have been
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@ -380,7 +383,7 @@ static void mmc_buffer(const struct mmcclk *clk,
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static void send_buffer(const struct mmcclk *clk,
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const uint8_t *buf, int nibbles, uint32_t mask)
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const uint8_t *buf, int nibbles, uint32_t mask, int trigger)
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{
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unsigned long phys;
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@ -392,12 +395,12 @@ static void send_buffer(const struct mmcclk *clk,
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asm("sync"); /* flush the write buffer */
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phys = physmem_xlat((void *) buf);
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mmc_buffer(clk, buf[0] >> 4, phys, nibbles, mask);
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mmc_buffer(clk, buf[0] >> 4, phys, nibbles, mask, trigger);
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}
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static void dma_pattern(const struct mmcclk *clk,
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const char *pattern, uint32_t mask)
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const char *pattern, uint32_t mask, int trigger)
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{
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const uint8_t *buf;
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int n;
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@ -413,6 +416,11 @@ static void dma_pattern(const struct mmcclk *clk,
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exit(1);
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}
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if (trigger != -1) {
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PDFUNC = UBB_CLK;
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IN(UBB_CLK);
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}
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dma_init();
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/* Initial static state: the first pattern. */
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@ -422,7 +430,7 @@ static void dma_pattern(const struct mmcclk *clk,
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PDDATS = (buf[0] >> 4) << 10;
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PDDIRS = mask;
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send_buffer(clk, buf, n, mask);
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send_buffer(clk, buf, n, mask, trigger);
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/* Final static state: the last pattern. */
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@ -489,14 +497,16 @@ static void usage(const char *name)
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"usage: %s\n"
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" %s [-q] -f freq_hz\n"
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" %s [-q] [-f freq_hz] -c [active_s]\n"
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" %s [-q] [-f freq_hz] [-C] [-m mask] [-p] file|pattern\n\n"
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" %s [-q] [-f freq_hz] [-C|-t 0|1] [-m mask] [-p] file|pattern\n\n"
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" -c output bus clock on CLK without sending a pattern\n"
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" -C temporarily output bus clock on CLK (for debugging)\n"
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" -f freq_hz set bus clock to the specified frequency (default: 1 MHz)\n"
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" -m mask use only the DATx lines specified in the mask (default: 0xf)\n"
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" -p force interpretation of argument as pattern (and not file)\n"
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" -q quiet. Don't pretty-print frequencies; don't report clock\n"
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" differences.\n\n"
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" differences.\n"
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" -t 0|1 start pattern when trigger/CLK becomes 0 or 1 respectively\n"
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" (default: start pattern immediately)\n\n"
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" active_s keep running that many seconds after setting the clock\n"
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" (default: exit immediately but leave the clock on)\n"
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" file file containing the pattern\n"
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@ -522,11 +532,12 @@ int main(int argc, char **argv)
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struct timespec active_ns;
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int keep_clk = 1;
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uint8_t mask = 0xf;
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int trigger = -1;
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char *end;
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int c;
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unsigned long tmp;
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while ((c = getopt(argc, argv, "cCf:m:pq")) != EOF)
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while ((c = getopt(argc, argv, "cCf:m:pqt:")) != EOF)
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switch (c) {
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case 'f':
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if (!frequency(optarg, &bus_hz, &bus_rel))
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@ -554,18 +565,28 @@ int main(int argc, char **argv)
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case 'q':
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quiet = 1;
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break;
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case 't':
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if (!strcmp(optarg, "0"))
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trigger = 0;
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else if (!strcmp(optarg, "1"))
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trigger = 1;
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else
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usage(*argv);
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break;
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default:
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usage(*argv);
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}
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if (clkout && clk_only)
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usage(*argv);
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if ((clkout || clk_only) && trigger != -1)
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usage(*argv);
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switch (argc-optind) {
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case 0:
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if (clk_only)
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break;
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if (clkout || force_pattern)
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if (clkout || force_pattern || trigger != -1)
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usage(*argv);
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ubb_open(UBB_ALL);
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@ -629,14 +650,14 @@ int main(int argc, char **argv)
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mmcclk_start(&clk);
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if (pattern)
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dma_pattern(&clk, pattern, mask << 10);
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dma_pattern(&clk, pattern, mask << 10, trigger);
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if (active_s)
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if (nanosleep(&active_ns, NULL))
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perror("nanosleep");
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if (pattern) {
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mmcclk_stop();
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ubb_close(mask << 10);
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ubb_close(mask << 10 | (trigger == -1 ? 0 : UBB_CLK));
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} else if (keep_clk) {
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ubb_close(UBB_CLK);
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} else {
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