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spi: spidev_test: send predictable data

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Introduce a flag to test on a predictable byte sequence instead of
random bytes. This is useful when comparing multiple runs with the same
option set e.g. with an oscilloscope.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
Link: https://patch.msgid.link/20260924-spi-sun4i-spidev_test-v7-10-126e31a07fdc@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jonas Rebmann 2026-09-24 15:44:00 +02:00 committed by Mark Brown
parent 951a60af6c
commit c807c71d21
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 27 additions and 11 deletions
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38
tools/spi/spidev_test.c
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@ -48,6 +48,7 @@ static int compare;
static int nonzero;
static int do_tx = 1, do_rx = 1;
static int random_input;
static int predictable;
static int input_choices;
static uint8_t default_tx[] = {
@ -189,7 +190,7 @@ static void transfer(int fd, uint8_t const *tx, uint8_t const *rx, size_t len)
static void print_usage(const char *prog)
{
printf("Usage: %s [-2348CDFHILMNORSZbcdiloprstvwz]\n", prog);
printf("Usage: %s [-2348CDFHILMNOPRSZbcdiloprstvwz]\n", prog);
puts("general device settings:\n"
" -D --device device to use (default /dev/spidev1.1)\n"
" -s --speed max speed (Hz)\n"
@ -214,6 +215,7 @@ static void print_usage(const char *prog)
" -o --output output data to a file (e.g. \"results.bin\")\n"
" -p send data (e.g. \"1234\\xde\\xad\")\n"
" -z --nonzero don't send 0x00 or 0xff bytes\n"
" -P --predictable transfer the given number of sequential bytes\n"
" -S --size transfer the given number of random bytes\n"
" -I --iter iterations\n"
"additional parameters:\n"
@ -259,12 +261,13 @@ static void parse_opts(int argc, char *argv[])
{ "no-cs", 0, 0, 'N' },
{ "ready", 0, 0, 'R' },
{ "mosi-idle-low", 0, 0, 'M' },
{ "predictable", 1, 0, 'P' },
{ "verbose", 0, 0, 'v' },
{ NULL, 0, 0, 0 },
};
int c;
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lctrHOLC3ZFMNR248p:vS:zI:",
c = getopt_long(argc, argv, "D:s:d:w:b:i:o:lctrHOLC3ZFMNR248p:P:vS:zI:",
lopts, NULL);
if (c == -1)
@ -342,6 +345,11 @@ static void parse_opts(int argc, char *argv[])
input_tx = optarg;
input_choices++;
break;
case 'P':
transfer_size = atoi(optarg);
predictable = 1;
input_choices++;
break;
case '2':
mode |= SPI_TX_DUAL;
break;
@ -462,9 +470,17 @@ static void transfer_buf(int fd, int len)
if (!tx)
pabort("can't allocate tx buffer");
for (i = 0; i < len; i++) {
do
tx[i] = random();
while (nonzero && (tx[i] == 0x0 || tx[i] == 0xff));
if (predictable) {
int v = i - iterations;
if (nonzero)
v = ((v % 254) + 254) % 254 + 1;
tx[i] = (char)v;
} else {
do {
tx[i] = random();
} while (nonzero && (tx[i] == 0x0 || tx[i] == 0xff));
}
}
}
@ -493,17 +509,17 @@ int main(int argc, char *argv[])
parse_opts(argc, argv);
if (input_choices > 1)
pabort("at most one of -S (--size), -p, -i (--input) may be selected, "
pabort("at most one of -S (--size), -p, -i (--input), -P (--predictable) may be selected, "
"and each may be specified only once");
if (random_input && transfer_size < 0)
pabort("a size argument is mandatory for -S (--size)");
if ((random_input || predictable) && transfer_size < 0)
pabort("a size argument is mandatory for -S (--size) and -P (--predictable)");
if (iterations && transfer_size < 0)
pabort("-I (--iter) is only implemented for -S (--size)");
pabort("-I (--iter) is only implemented for -S (--size) and -P (--predictable)");
if (nonzero && transfer_size < 0)
pabort("-z (--nonzero) is only implemented for -S (--size)");
pabort("-z (--nonzero) is only implemented for -S (--size) and -P (--predictable)");
if (compare && (!do_tx || !do_rx))
pabort("-c (--compare) conflicts with -t (--no-tx) or -r (--no-rx)");
@ -512,7 +528,7 @@ int main(int argc, char *argv[])
pabort("-r (--no-rx) conflicts with -o (--output)");
if (!do_tx && transfer_size < 0)
pabort("-t (--no-tx) is only implemented for -S (--size)");
pabort("-t (--no-tx) is only implemented for -S (--size) and -P (--predictable)");
if (compare && mode & (SPI_TX_OCTAL | SPI_TX_QUAD | SPI_TX_DUAL))
pabort("-c (--compare) conflicts with -2 (--dual), -4 (--quad) or -8 (--octal)");