From: Keith Packard <keithp@keithp.com>
Date: Mon, 8 Jan 2018 05:43:22 +0000 (-0800)
Subject: ao-chaosread: add --raw and --cooked flags
X-Git-Tag: 1.8.5~1^2~2^2~10
X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=commitdiff_plain;h=db7f7c6c7f956058250b8057c6c27284f6f22e53

ao-chaosread: add --raw and --cooked flags

Allow reading from the cooked endpoint as well as the raw one.

Signed-off-by: Keith Packard <keithp@keithp.com>
---

diff --git a/ao-tools/ao-chaosread/ao-chaosread.1 b/ao-tools/ao-chaosread/ao-chaosread.1
index ead8afb2..e6ed2fac 100644
--- a/ao-tools/ao-chaosread/ao-chaosread.1
+++ b/ao-tools/ao-chaosread/ao-chaosread.1
@@ -33,6 +33,20 @@ one found.
 \-l length | --length length
 Set the amount of data to read. Suffixes 'k', 'M' and 'G' are
 supported. The default is 1k.
+.TP
+\-i | --infinite
+Read an unlimited amount of data.
+.TP
+\-b | --bytes
+For each 16-bit value read, output bits 1-8 as a byte, don't output
+bit 0 or bits 9-15 at all.
+.TP
+\-c | --cooked
+Read whitened data from the device. The default is to read raw data
+from the noise source.
+.TP
+\-r | --raw
+Read raw data from the noise source. This is the default.
 .SH USAGE
 .I ao-chaosread
 reads noise data.
diff --git a/ao-tools/ao-chaosread/ao-chaosread.c b/ao-tools/ao-chaosread/ao-chaosread.c
index 6d860139..8a814a00 100644
--- a/ao-tools/ao-chaosread/ao-chaosread.c
+++ b/ao-tools/ao-chaosread/ao-chaosread.c
@@ -172,10 +172,11 @@ chaoskey_close(struct chaoskey *ck)
 	free(ck);
 }
 
-#define ENDPOINT	0x86
+#define COOKED_ENDPOINT	0x85
+#define RAW_ENDPOINT	0x86
 
 int
-chaoskey_read(struct chaoskey *ck, void *buffer, int len)
+chaoskey_read(struct chaoskey *ck, int endpoint, void *buffer, int len)
 {
 	uint8_t	*buf = buffer;
 	int	total = 0;
@@ -184,7 +185,7 @@ chaoskey_read(struct chaoskey *ck, void *buffer, int len)
 		int	ret;
 		int	transferred;
 
-		ret = libusb_bulk_transfer(ck->handle, ENDPOINT, buf, len, &transferred, 10000);
+		ret = libusb_bulk_transfer(ck->handle, endpoint, buf, len, &transferred, 10000);
 		if (ret) {
 			if (total)
 				return total;
@@ -205,12 +206,14 @@ static const struct option options[] = {
 	{ .name = "length", .has_arg = 1, .val = 'l' },
 	{ .name = "infinite", .has_arg = 0, .val = 'i' },
 	{ .name = "bytes", .has_arg = 0, .val = 'b' },
+	{ .name = "cooked", .has_arg = 0, .val = 'c' },
+	{ .name = "raw", .has_arg = 0, .val = 'r' },
 	{ 0, 0, 0, 0},
 };
 
 static void usage(char *program)
 {
-	fprintf(stderr, "usage: %s [--serial=<serial>] [--length=<length>[kMG]] [--infinite] [--bytes]\n", program);
+	fprintf(stderr, "usage: %s [--serial=<serial>] [--length=<length>[kMG]] [--infinite] [--bytes] [--cooked] [--raw]\n", program);
 	exit(1);
 }
 
@@ -228,8 +231,9 @@ main (int argc, char **argv)
 	int	this_time;
 	int	infinite = 0;
 	int	bytes = 0;
+	int	endpoint = RAW_ENDPOINT;
 
-	while ((c = getopt_long(argc, argv, "s:l:ib", options, NULL)) != -1) {
+	while ((c = getopt_long(argc, argv, "s:l:ibcr", options, NULL)) != -1) {
 		switch (c) {
 		case 's':
 			serial = optarg;
@@ -252,6 +256,12 @@ main (int argc, char **argv)
 		case 'b':
 			bytes = 1;
 			break;
+		case 'c':
+			endpoint = COOKED_ENDPOINT;
+			break;
+		case 'r':
+			endpoint = RAW_ENDPOINT;
+			break;
 		default:
 			usage(argv[0]);
 			break;
@@ -269,7 +279,7 @@ main (int argc, char **argv)
 		this_time = sizeof(buf);
 		if (!infinite && length < sizeof(buf))
 			this_time = (int) length;
-		got = chaoskey_read(ck, buf, this_time);
+		got = chaoskey_read(ck, endpoint, buf, this_time);
 		if (got < 0) {
 			perror("read");
 			exit(1);