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i2c_shell: Add write_byte/read_byte commands

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Add simple commands to read or write a single byte from a device
register.

   i2c write_byte I2C_2 36 b0 12
   i2c read_byte I2C_2 36 0
   Output: 0x82

I modified Anas' version to put args in variables first so that the code
is self-documenting.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Anas Nashif 2020-01-10 09:09:24 -05:00 committed by Carles Cufí
parent 0ecc71ccb2
commit ffd568db09
1 changed files with 62 additions and 0 deletions
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62
drivers/i2c/i2c_shell.c
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@ -9,6 +9,7 @@
#include <drivers/i2c.h>
#include <string.h>
#include <sys/util.h>
#include <stdlib.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(i2c_shell, CONFIG_LOG_DEFAULT_LEVEL);
@ -87,6 +88,61 @@ static int cmd_i2c_recover(const struct shell *shell,
return 0;
}
static int cmd_i2c_write_byte(const struct shell *shell,
size_t argc, char **argv)
{
struct device *dev;
int reg_addr;
int dev_addr;
int out_byte;
dev = device_get_binding(argv[1]);
if (!dev) {
shell_error(shell, "I2C: Device driver %s not found.",
argv[1]);
return -ENODEV;
}
dev_addr = strtol(argv[2], NULL, 16);
reg_addr = strtol(argv[3], NULL, 16);
out_byte = strtol(argv[4], NULL, 16);
if (i2c_reg_write_byte(dev, dev_addr, reg_addr, out_byte) < 0) {
shell_error(shell, "Failed to write to device: %s", argv[1]);
return -EIO;
}
return 0;
}
static int cmd_i2c_read_byte(const struct shell *shell,
size_t argc, char **argv)
{
struct device *dev;
int reg_addr;
int dev_addr;
u8_t out;
dev = device_get_binding(argv[1]);
if (!dev) {
shell_error(shell, "I2C: Device driver %s not found.",
argv[1]);
return -ENODEV;
}
dev_addr = strtol(argv[2], NULL, 16);
reg_addr = strtol(argv[3], NULL, 16);
if (i2c_reg_read_byte(dev, dev_addr, reg_addr, &out) < 0) {
shell_error(shell, "Failed to read from device: %s", argv[1]);
return -EIO;
}
shell_print(shell, "Output: 0x%x", out);
return 0;
}
static void device_name_get(size_t idx, struct shell_static_entry *entry);
SHELL_DYNAMIC_CMD_CREATE(dsub_device_name, device_name_get);
@ -119,6 +175,12 @@ SHELL_STATIC_SUBCMD_SET_CREATE(sub_i2c_cmds,
"Scan I2C devices", cmd_i2c_scan),
SHELL_CMD(recover, &dsub_device_name,
"Recover I2C bus", cmd_i2c_recover),
SHELL_CMD_ARG(read_byte, &dsub_device_name,
"Read a byte from an I2C device",
cmd_i2c_read_byte, 3, 1),
SHELL_CMD_ARG(write_byte, &dsub_device_name,
"Write a byte to an I2C device",
cmd_i2c_write_byte, 4, 1),
SHELL_SUBCMD_SET_END /* Array terminated. */
);