| /* |
| * Copyright (c) 2023 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/drivers/adc.h> |
| #include <zephyr/drivers/dac.h> |
| #include <zephyr/drivers/adc.h> |
| #include <zephyr/ztest.h> |
| |
| #define DIV 2 |
| |
| #define DAC_DEVICE_NODE DT_PROP(DT_PATH(zephyr_user), dac) |
| |
| extern const struct adc_dt_spec *get_adc_channel(void); |
| |
| static const struct dac_channel_cfg dac_ch_cfg = { |
| .channel_id = DT_PROP(DT_PATH(zephyr_user), dac_channel_id), |
| .resolution = DT_PROP(DT_PATH(zephyr_user), dac_resolution), |
| .buffered = true |
| }; |
| |
| static const struct device *init_dac(void) |
| { |
| int ret; |
| const struct device *const dac_dev = DEVICE_DT_GET(DAC_DEVICE_NODE); |
| |
| zassert_true(device_is_ready(dac_dev), "DAC device is not ready"); |
| |
| ret = dac_channel_setup(dac_dev, &dac_ch_cfg); |
| zassert_equal(ret, 0, |
| "Setting up of the first channel failed with code %d", ret); |
| |
| return dac_dev; |
| } |
| |
| static int test_dac_to_adc(void) |
| { |
| int ret, write_val; |
| int32_t sample_buffer = 0; |
| |
| struct adc_sequence sequence = { |
| .buffer = &sample_buffer, |
| .buffer_size = sizeof(sample_buffer), |
| }; |
| |
| const struct device *dac_dev = init_dac(); |
| const struct adc_dt_spec *adc_channel = get_adc_channel(); |
| |
| write_val = (1U << dac_ch_cfg.resolution) / DIV; |
| |
| ret = dac_write_value(dac_dev, DT_PROP(DT_PATH(zephyr_user), dac_channel_id), write_val); |
| |
| zassert_equal(ret, 0, "dac_write_value() failed with code %d", ret); |
| |
| k_sleep(K_MSEC(10)); |
| |
| adc_sequence_init_dt(adc_channel, &sequence); |
| ret = adc_read_dt(adc_channel, &sequence); |
| |
| zassert_equal(ret, 0, "adc_read_dt() failed with code %d", ret); |
| zassert_within(sample_buffer, |
| (1U << adc_channel->resolution) / DIV, 32, |
| "Value %d read from ADC does not match expected range.", |
| sample_buffer); |
| |
| return TC_PASS; |
| } |
| |
| ZTEST(adc_accuracy_test, test_dac_to_adc) |
| { |
| int i; |
| |
| for (i = 0; i < CONFIG_NUMBER_OF_PASSES; i++) { |
| zassert_true(test_dac_to_adc() == TC_PASS); |
| } |
| } |