drivers: dac: add DAC shell commands

Add shell commands for controlling digital-to-analog (DAC) devices.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

drivers/dac/CMakeLists.txt

@@ -5,4 +5,5 @@ zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_DAC_MCUX_DAC	dac_mcux_dac.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_MCUX_DAC32	dac_mcux_dac32.c)
 zephyr_library_sources_ifdef(CONFIG_DAC_STM32		dac_stm32.c)
+zephyr_library_sources_ifdef(CONFIG_DAC_SHELL		dac_shell.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE		dac_handlers.c)

drivers/dac/Kconfig

@@ -17,6 +17,12 @@ module = DAC
 module-str = DAC
 source "subsys/logging/Kconfig.template.log_config"
 
+config DAC_SHELL
+	bool "Enable DAC shell"
+	depends on SHELL
+	help
+	  Enable DAC related shell commands.
+
 source "drivers/dac/Kconfig.mcux"
 
 source "drivers/dac/Kconfig.stm32"

drivers/dac/dac_shell.c

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief DAC shell commands.
+ */
+
+#include <shell/shell.h>
+#include <drivers/dac.h>
+#include <stdlib.h>
+
+struct args_index {
+	u8_t device;
+	u8_t channel;
+	u8_t reference;
+	u8_t value;
+	u8_t buffered;
+	u8_t resolution;
+};
+
+static const struct args_index args_indx = {
+	.device = 1,
+	.channel = 2,
+	.reference = 3,
+	.value = 3,
+	.buffered = 4,
+	.resolution = 4,
+};
+
+static int cmd_setup(const struct shell *shell, size_t argc, char **argv)
+{
+	struct dac_channel_cfg cfg;
+	struct device *dac;
+	int err;
+
+	dac = device_get_binding(argv[args_indx.device]);
+	if (!dac) {
+		shell_error(shell, "DAC device not found");
+		return -EINVAL;
+	}
+
+	cfg.channel_id = strtoul(argv[args_indx.channel], NULL, 0);
+	/* TODO: Allow text input for reference */
+	cfg.reference = strtoul(argv[args_indx.reference], NULL, 0);
+
+	if (argc == (args_indx.buffered + 1)) {
+		cfg.buffered = strtoul(argv[args_indx.buffered], NULL, 2);
+	} else {
+		cfg.buffered = false;
+	}
+
+	err = dac_channel_setup(dac, &cfg);
+	if (err) {
+		shell_error(shell, "Failed to setup DAC channel (err %d)", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int cmd_write_value(const struct shell *shell, size_t argc, char **argv)
+{
+	struct device *dac;
+	u8_t resolution;
+	u8_t channel;
+	u32_t value;
+	int err;
+
+	dac = device_get_binding(argv[args_indx.device]);
+	if (!dac) {
+		shell_error(shell, "DAC device not found");
+		return -EINVAL;
+	}
+
+	channel = strtoul(argv[args_indx.channel], NULL, 0);
+	value = strtoul(argv[args_indx.value], NULL, 0);
+	resolution = strtoul(argv[args_indx.resolution], NULL, 0);
+
+	err = dac_write_value(dac, channel, value, resolution);
+	if (err) {
+		shell_error(shell, "Failed to write DAC value (err %d)", err);
+		return err;
+	}
+
+	return 0;
+}
+
+SHELL_STATIC_SUBCMD_SET_CREATE(dac_cmds,
+	SHELL_CMD_ARG(setup, NULL, "<device> <channel> <reference> [buffered]",
+		      cmd_setup, 4, 1),
+	SHELL_CMD_ARG(write_value, NULL, "<device> <channel> <value> <resolution>",
+		      cmd_write_value, 5, 0),
+	SHELL_SUBCMD_SET_END
+);
+
+SHELL_CMD_REGISTER(dac, &dac_cmds, "DAC shell commands", NULL);