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author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-11-05 19:30:19 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-11-12 08:32:16 +0100 |
commit | 055b31e92e9a9b67fc59b15094e4356f6842a4b0 (patch) | |
tree | 8f6ab47707d61a68358d24d47460862f6a367c8d /commands/spi.c | |
parent | 968d444cdd38387882fe7bccac5dd6c8c83685a3 (diff) | |
download | barebox-055b31e92e9a9b67fc59b15094e4356f6842a4b0.tar.gz barebox-055b31e92e9a9b67fc59b15094e4356f6842a4b0.tar.xz |
introduce spi command
usefull to debug spi
The command allow to read/write on a spi device
Usage: spi [OPTION] [data to write 0xXX]
write/read spi device.
-b <bus_num> spi bus number (default = 0)
-r <count> to read
-c <cs> chip select (default = 0)
-m <mode> spi mode (default = 0)
-f <hz> max_speed_hz (default = 1MHz)
-w <bit> bits_per_word (default = 8)
-v verbose
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/spi.c')
-rw-r--r-- | commands/spi.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/commands/spi.c b/commands/spi.c new file mode 100644 index 0000000000..899bf62608 --- /dev/null +++ b/commands/spi.c @@ -0,0 +1,132 @@ +/* + * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> + * + * Under GPLv2 only + * + */ + +#include <common.h> +#include <command.h> +#include <errno.h> +#include <malloc.h> +#include <getopt.h> +#include <spi/spi.h> + +static int do_spi(int argc, char *argv[]) +{ + struct spi_device spi; + int bus = 0; + int read = 0; + int verbose = 0; + int opt, count, i, ret; + int byte_per_word; + + u8 *tx_buf, *rx_buf; + + memset(&spi, 0, sizeof(struct spi_device)); + + spi.max_speed_hz = 1 * 1000 * 1000; + spi.bits_per_word = 8; + + while ((opt = getopt(argc, argv, "b:c:r:m:f:w:v")) > 0) { + switch (opt) { + case 'b': + bus = simple_strtol(optarg, NULL, 0); + break; + case 'r': + read = simple_strtol(optarg, NULL, 0); + break; + case 'c': + spi.chip_select = simple_strtoul(optarg, NULL, 0); + break; + case 'm': + spi.mode = simple_strtoul(optarg, NULL, 0); + break; + case 'f': + spi.max_speed_hz = simple_strtoul(optarg, NULL, 0); + break; + case 'w': + spi.bits_per_word = simple_strtoul(optarg, NULL, 0); + break; + case 'v': + verbose = 1; + break; + default: + return COMMAND_ERROR_USAGE; + } + } + + count = argc - optind; + + if ((!read && !count) || !spi.max_speed_hz || !spi.bits_per_word) + return COMMAND_ERROR_USAGE; + + + spi.master = spi_get_master(bus); + if (!spi.master) { + printf("spi bus %d not found\n", bus); + return -ENODEV; + } + + if (spi.chip_select > spi.master->num_chipselect) { + printf("spi chip select (%d)> master num chipselect (%d)\n", + spi.chip_select, spi.master->num_chipselect); + return -EINVAL; + } + + ret = spi.master->setup(&spi); + if (ret) { + printf("can not setup the master (%d)\n", ret); + return ret; + } + + tx_buf = xmalloc(count); + rx_buf = xmalloc(count); + + for (i = 0; i < count; i++) + tx_buf[i] = (u8) simple_strtol(argv[optind + i], NULL, 16); + + ret = spi_write_then_read(&spi, tx_buf, count, rx_buf, read); + if (ret) + goto out; + + byte_per_word = max(spi.bits_per_word / 8, 1); + if (verbose) { + printf("device config\n"); + printf(" bus_num = %d\n", spi.master->bus_num); + printf(" max_speed_hz = %d\n", spi.max_speed_hz); + printf(" chip_select = %d\n", spi.chip_select); + printf(" mode = 0x%x\n", spi.mode); + printf(" bits_per_word = %d\n", spi.bits_per_word); + printf("\n"); + + printf("wrote %i bytes\n", count); + memory_display(tx_buf, 0, count, byte_per_word); + + printf("read %i bytes\n", read); + } + + memory_display(rx_buf, 0, read, byte_per_word); + +out: + free(rx_buf); + free(tx_buf); + return ret; +} + +static const __maybe_unused char cmd_spi_help[] = +"Usage: spi [OPTION] [data to write 0xXX]\n" +"write/read spi device.\n" +" -b <bus_num> spi bus number (default = 0)\n" +" -r <count> to read\n" +" -c <cs> chip select (default = 0)\n" +" -m <mode> spi mode (default = 0)\n" +" -f <hz> max_speed_hz (default = 1MHz)\n" +" -w <bit> bits_per_word (default = 8)\n" +" -v verbose\n"; + +BAREBOX_CMD_START(spi) + .cmd = do_spi, + .usage = "write/read spi device", + BAREBOX_CMD_HELP(cmd_spi_help) +BAREBOX_CMD_END |