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spi: shell: Add command to include CS GPIO in SPI device

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This allows to configure a GPIO pin as a CS line, in order to perform
spi transfers to a particular device in the bus.

Example usage for using GPIO1.12 with GPIO_ACTIVE_LOW:
`spi cs gpio1 12 0x01`

Signed-off-by: Luis Ubieda <luisf@croxel.com>
This commit is contained in:
Luis Ubieda 2025-01-23 00:13:32 -05:00 • committed by Benjamin Cabé
commit 832810e650
1 changed files with 44 additions and 0 deletions
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44
drivers/spi/spi_shell.c
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@ -17,6 +17,10 @@
#define CONF_ARGV_FREQUENCY (2)
#define CONF_ARGV_SETTINGS (3)
#define CS_ARGV_GPIO_DEV (1)
#define CS_ARGV_GPIO_PIN (2)
#define CS_ARGV_GPIO_FLAGS (3)
/* Maximum bytes we can write and read at once */
#define MAX_SPI_BYTES MIN((CONFIG_SHELL_ARGC_MAX - TXRX_ARGV_BYTES), 32)
@ -135,6 +139,41 @@ out:
return 0;
}
static int cmd_spi_conf_cs(const struct shell *ctx, size_t argc, char **argv)
{
struct device *dev = (struct device *)shell_device_get_binding(argv[CS_ARGV_GPIO_DEV]);
char *endptr = NULL;
if (dev == NULL) {
shell_error(ctx, "device %s not found.", argv[CS_ARGV_GPIO_DEV]);
return -ENODEV;
}
int pin = strtol(argv[CS_ARGV_GPIO_PIN], &endptr, 10);
if (endptr == argv[CS_ARGV_GPIO_PIN] || (pin < 0)) {
shell_error(ctx, "invalid pin number: %s", argv[CS_ARGV_GPIO_PIN]);
return -EINVAL;
}
config.cs.gpio.port = dev;
config.cs.gpio.pin = pin;
/* Include flags if provided */
if (argc == (CS_ARGV_GPIO_FLAGS + 1)) {
uint32_t flags = strtol(argv[CS_ARGV_GPIO_FLAGS], &endptr, 16);
if (endptr == argv[CS_ARGV_GPIO_FLAGS]) {
shell_error(ctx, "invalid gpio flags: %s", argv[CS_ARGV_GPIO_FLAGS]);
return -EINVAL;
}
config.cs.gpio.dt_flags = flags;
}
return 0;
}
SHELL_STATIC_SUBCMD_SET_CREATE(sub_spi_cmds,
SHELL_CMD_ARG(conf, &dsub_device_name,
"Configure SPI\n"
@ -146,6 +185,11 @@ SHELL_STATIC_SUBCMD_SET_CREATE(sub_spi_cmds,
"T - SPI_FRAME_FORMAT_TI\n"
"example: spi conf spi1 1000000 ol",
cmd_spi_conf, 3, 1),
SHELL_CMD_ARG(cs, &dsub_device_name,
"Assign CS GPIO to SPI device\n"
"Usage: spi cs <gpio-device> <pin> [<gpio flags>]"
"example: spi conf gpio1 3 0x01",
cmd_spi_conf_cs, 3, 1),
SHELL_CMD_ARG(transceive, NULL,
"Transceive data to and from an SPI device\n"
"Usage: spi transceive <TX byte 1> [<TX byte 2> ...]",