1 /*
2 * Copyright (c) 2023 Intel Corporation
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/drivers/adc.h>
8 #include <zephyr/drivers/dac.h>
9 #include <zephyr/drivers/adc.h>
10 #include <zephyr/ztest.h>
11
12 #define DIV 2
13
14 #define DAC_DEVICE_NODE DT_PROP(DT_PATH(zephyr_user), dac)
15
16 extern const struct adc_dt_spec *get_adc_channel(void);
17
18 static const struct dac_channel_cfg dac_ch_cfg = {
19 .channel_id = DT_PROP(DT_PATH(zephyr_user), dac_channel_id),
20 .resolution = DT_PROP(DT_PATH(zephyr_user), dac_resolution),
21 .buffered = true
22 };
23
init_dac(void)24 static const struct device *init_dac(void)
25 {
26 int ret;
27 const struct device *const dac_dev = DEVICE_DT_GET(DAC_DEVICE_NODE);
28
29 zassert_true(device_is_ready(dac_dev), "DAC device is not ready");
30
31 ret = dac_channel_setup(dac_dev, &dac_ch_cfg);
32 zassert_equal(ret, 0,
33 "Setting up of the first channel failed with code %d", ret);
34
35 return dac_dev;
36 }
37
test_dac_to_adc(void)38 static int test_dac_to_adc(void)
39 {
40 int ret, write_val;
41 int32_t sample_buffer = 0;
42
43 struct adc_sequence sequence = {
44 .buffer = &sample_buffer,
45 .buffer_size = sizeof(sample_buffer),
46 };
47
48 const struct device *dac_dev = init_dac();
49 const struct adc_dt_spec *adc_channel = get_adc_channel();
50
51 write_val = (1U << dac_ch_cfg.resolution) / DIV;
52
53 ret = dac_write_value(dac_dev, DT_PROP(DT_PATH(zephyr_user), dac_channel_id), write_val);
54
55 zassert_equal(ret, 0, "dac_write_value() failed with code %d", ret);
56
57 k_sleep(K_MSEC(10));
58
59 adc_sequence_init_dt(adc_channel, &sequence);
60 ret = adc_read_dt(adc_channel, &sequence);
61
62 zassert_equal(ret, 0, "adc_read_dt() failed with code %d", ret);
63 zassert_within(sample_buffer,
64 (1U << adc_channel->resolution) / DIV, 32,
65 "Value %d read from ADC does not match expected range.",
66 sample_buffer);
67
68 return TC_PASS;
69 }
70
ZTEST(adc_accuracy_test,test_dac_to_adc)71 ZTEST(adc_accuracy_test, test_dac_to_adc)
72 {
73 int i;
74
75 for (i = 0; i < CONFIG_NUMBER_OF_PASSES; i++) {
76 zassert_true(test_dac_to_adc() == TC_PASS);
77 }
78 }
79
