c875ce71b0
Add support DAC for ek_ra4m1, ek_ra4w1, fpb_ra4e1, voice_ra4e1, ek_ra4l1 Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
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* Copyright (c) 2020 Libre Solar Technologies GmbH
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/sys/printk.h>
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#include <zephyr/drivers/dac.h>
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#define ZEPHYR_USER_NODE DT_PATH(zephyr_user)
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#if (DT_NODE_HAS_PROP(ZEPHYR_USER_NODE, dac) && \
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DT_NODE_HAS_PROP(ZEPHYR_USER_NODE, dac_channel_id) && \
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DT_NODE_HAS_PROP(ZEPHYR_USER_NODE, dac_resolution))
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#define DAC_NODE DT_PHANDLE(ZEPHYR_USER_NODE, dac)
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#define DAC_CHANNEL_ID DT_PROP(ZEPHYR_USER_NODE, dac_channel_id)
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#define DAC_RESOLUTION DT_PROP(ZEPHYR_USER_NODE, dac_resolution)
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#else
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#error "Unsupported board: see README and check /zephyr,user node"
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#define DAC_NODE DT_INVALID_NODE
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#define DAC_CHANNEL_ID 0
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#define DAC_RESOLUTION 0
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#endif
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static const struct device *const dac_dev = DEVICE_DT_GET(DAC_NODE);
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static const struct dac_channel_cfg dac_ch_cfg = {
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.channel_id = DAC_CHANNEL_ID,
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.resolution = DAC_RESOLUTION,
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#if defined(CONFIG_DAC_BUFFER_NOT_SUPPORT)
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.buffered = false,
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#else
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.buffered = true,
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#endif /* CONFIG_DAC_BUFFER_NOT_SUPPORT */
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};
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int main(void)
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{
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if (!device_is_ready(dac_dev)) {
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printk("DAC device %s is not ready\n", dac_dev->name);
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return 0;
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}
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int ret = dac_channel_setup(dac_dev, &dac_ch_cfg);
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if (ret != 0) {
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printk("Setting up of DAC channel failed with code %d\n", ret);
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return 0;
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}
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printk("Generating sawtooth signal at DAC channel %d.\n",
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DAC_CHANNEL_ID);
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while (1) {
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/* Number of valid DAC values, e.g. 4096 for 12-bit DAC */
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const int dac_values = 1U << DAC_RESOLUTION;
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/*
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* 1 msec sleep leads to about 4 sec signal period for 12-bit
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* DACs. For DACs with lower resolution, sleep time needs to
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* be increased.
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* Make sure to sleep at least 1 msec even for future 16-bit
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* DACs (lowering signal frequency).
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*/
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const int sleep_time = 4096 / dac_values > 0 ?
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4096 / dac_values : 1;
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for (int i = 0; i < dac_values; i++) {
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ret = dac_write_value(dac_dev, DAC_CHANNEL_ID, i);
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if (ret != 0) {
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printk("dac_write_value() failed with code %d\n", ret);
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return 0;
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}
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k_sleep(K_MSEC(sleep_time));
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}
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}
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return 0;
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}
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