ubb-la/ubb-la.c: add command-line options, keyboard abort

ubb-la/ubb-la.c

@@ -13,6 +13,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 #include <string.h>
 #include <math.h>
 #include <assert.h>
@@ -26,6 +27,8 @@
 
 #define	DMA	5
 
+#define	KEY_MASK	0x5fc0000
+
 
 /* ----- Enable/disable interrupts ----------------------------------------- */
 
@@ -103,7 +106,8 @@ static void wait_dma_done(void)
 /* ----- MMC control ------------------------------------------------------- */
 
 
-static void xfer(unsigned long buf, int nibbles)
+static int xfer(unsigned long buf, int nibbles,
+    uint32_t trigger, uint32_t mask)
 {
 	dma_init();
 	dma_setup(buf, nibbles);
@@ -127,9 +131,9 @@ static void xfer(unsigned long buf, int nibbles)
 
 	disable_interrupts();
 
-	while (!(PDPIN & UBB_DAT1));
-
-//	sleep(1);		/* @@@ wait here for trigger */
+	while ((PDPIN & mask) != trigger)
+		if ((PDPIN & KEY_MASK) != KEY_MASK)
+			goto quit;
 
 	DCS(DMA) =
 	    DCS_NDES |          /* no descriptor */
@@ -139,16 +143,23 @@ static void xfer(unsigned long buf, int nibbles)
 
 	wait_dma_done();
 
-printf("MSC_STAT = %08x\n", MSC_STAT);
+//printf("MSC_STAT = %08x\n", MSC_STAT);
 
 	dma_cleanup();
 
+	return 1;
+
+quit:
+	enable_interrupts();
+	dma_cleanup();
+
+	return 0;
 }
 
 
-static void do_buf(int nibbles)
+static int do_buf(int nibbles, uint32_t trigger, uint32_t mask)
 {
-	uint8_t *buf = physmem_malloc(4095);
+	uint8_t *buf = physmem_malloc(4096);
 	struct physmem_vec vec;
 	int n, i;
 	uint8_t v, last = 0xff;
@@ -159,15 +170,16 @@ static void do_buf(int nibbles)
 		exit(1);
 	}
 
-	memset(buf, 0, 4095);
-	physmem_flush(buf, 4095);
+	memset(buf, 0, 4096);
+	physmem_flush(buf, 4096);
 
 	n = physmem_xlat((void *) buf, nibbles >> 1, &vec, 1);
 	if (n != 1) {
 		fprintf(stderr, "physmem_xlat_vec: expected 1, got %d\n", n);
 		exit(1);
 	}
-	xfer(vec.addr, nibbles);
+	if (!xfer(vec.addr, nibbles, trigger, mask))
+		return 0;
 
 	for (i = 0; i != nibbles; i++) {
 		v = (buf[i >> 1] >> (4*(~i & 1))) & 0xf;
@@ -192,9 +204,18 @@ static void do_buf(int nibbles)
 		printf("%X\n", last);
 	else
 		printf("%X{%d}\n", last, count);
+	return 1;
 }
 
 
+/* ----- Command-line processing ------------------------------------------- */
+
+
+/*
+ * Among equal bus rates, pick the configuration with the fastest MMC clock.
+ * It'll save a few nanoseconds.
+ */
+
 static void frequency(struct mmcclk *clk, int hz)
 {
 	struct mmcclk mmc;
@@ -202,31 +223,97 @@ static void frequency(struct mmcclk *clk, int hz)
 	mmcclk_first(&mmc, 0);
 	*clk = mmc;
 	while (mmcclk_next(&mmc))
-		if (fabs(clk->bus_clk_hz-hz) > fabs(mmc.bus_clk_hz-hz))
+		if (fabs(clk->bus_clk_hz-hz) > fabs(mmc.bus_clk_hz-hz) ||
+		    (fabs(clk->bus_clk_hz-hz) == fabs(mmc.bus_clk_hz-hz) &&
+		    clk->clkdiv > mmc.clkdiv))
 			*clk = mmc;
 }
 
 
+static unsigned long xlat_pins(unsigned long pins)
+{
+	if (pins & ~0x1fUL) {
+		fprintf(stderr, "invalid trigger set/mask: 0x%lx\n", pins);
+		exit(1);
+	}
+	pins <<= 10;
+	if (pins & (0x10 << 10))
+		pins = (pins ^ (0x10 << 10)) | UBB_CLK;
+	return pins;
+}
+
+
+static void usage(const char *name)
+{
+	fprintf(stderr,
+"usage: %s [-C] [-t pattern/mask] [-f frequency_MHz]\n\n"
+"  -C               output the MMC clock on CLK/TRIG (for debugging)\n"
+"  -f freq_MHz      select the specified frequency (default; 1 MHz)\n"
+"  -t pattern/mask  start capture at the specified pattern (DAT0 = 1, etc.,\n"
+"                   CLK = 16). Default: any change on TRIG.\n"
+    , name);
+	exit(1);
+}
+
+
 int main(int argc, char **argv)
 {
+	double freq_mhz = 1;
+	unsigned long trigger = 1, mask = 0;
+	int clkout = 0;
 	struct mmcclk clk;
+	char *end;
+	int c, res;
+
+	while ((c = getopt(argc, argv, "Cf:t:")) != EOF)
+		switch (c) {
+		case 'C':
+			clkout = 1;
+			break;
+		case 'f':
+			freq_mhz = strtod(optarg, &end);
+			if (*end)
+				usage(*argv);
+			break;
+		case 't':
+			trigger = strtoul(optarg, &end, 0);
+			if (*end != '/')
+				usage(*argv);
+			mask = strtoul(end+1, &end, 0);
+			if (*end)
+				usage(*argv);
+			trigger = xlat_pins(trigger);
+			mask = xlat_pins(mask);
+			break;
+		default:
+			usage(*argv);
+		}
+
+	if (optind != argc)
+		usage(*argv);
 
 	ubb_open(UBB_ALL);
 	PDFUNS = UBB_DAT0 | UBB_DAT1 | UBB_DAT2 | UBB_DAT3;
-	PDFUNS = UBB_CLK;
+	if (clkout)
+		PDFUNS = UBB_CLK;
 	OUT(UBB_CMD);
 	CLR(UBB_CMD);
 	PDFUNC = UBB_CMD;
 
-	frequency(&clk, atoi(argv[1]));
-	printf("bus %g MHz (MSC %g MHz)\n", clk.bus_clk_hz/1e6,
+	frequency(&clk, 1e6*freq_mhz);
+	fprintf(stderr, "bus %g MHz controller %g MHz\n", clk.bus_clk_hz/1e6,
 	    clk.sys_clk_hz/(clk.clkdiv+1.0)/1e6);
 	mmcclk_start(&clk);
 
-	do_buf(6400);
+	if (trigger == 1) {
+		trigger = ~PDPIN & UBB_CLK;
+		mask = UBB_CLK;
+	}
+
+	res = !do_buf(8128, trigger, mask);
 
 	mmcclk_stop();
 	ubb_close(UBB_ALL);
 
-	return 0;
+	return res;
 }