1 /*
2 * SPDX-FileCopyrightText: 2019-2022 Espressif Systems (Shanghai) CO LTD
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7
8 #include <zephyr/kernel.h>
9
10 #include <string.h>
11 #include "esp_check.h"
12 #include "driver/rtc_io.h"
13 #include "driver/dac_types_legacy.h"
14 #include "soc/dac_periph.h"
15 #include "hal/gpio_types.h"
16 #include "hal/dac_ll.h"
17 #include "clk_ctrl_os.h"
18
19 extern int rtc_spinlock;
20
21 #define RTC_ENTER_CRITICAL() do { rtc_spinlock = irq_lock(); } while(0)
22 #define RTC_EXIT_CRITICAL() irq_unlock(rtc_spinlock);
23
24 static __attribute__((unused)) const char *TAG = "DAC";
25
26 /*---------------------------------------------------------------
27 DAC
28 ---------------------------------------------------------------*/
dac_pad_get_io_num(dac_channel_t channel,gpio_num_t * gpio_num)29 esp_err_t dac_pad_get_io_num(dac_channel_t channel, gpio_num_t *gpio_num)
30 {
31 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
32
33 *gpio_num = (gpio_num_t)dac_periph_signal.dac_channel_io_num[channel];
34
35 return ESP_OK;
36 }
37
dac_rtc_pad_init(dac_channel_t channel)38 static esp_err_t dac_rtc_pad_init(dac_channel_t channel)
39 {
40 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
41
42 gpio_num_t gpio_num = 0;
43 dac_pad_get_io_num(channel, &gpio_num);
44 rtc_gpio_init(gpio_num);
45 rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_DISABLED);
46 rtc_gpio_pullup_dis(gpio_num);
47 rtc_gpio_pulldown_dis(gpio_num);
48
49 return ESP_OK;
50 }
51
dac_output_enable(dac_channel_t channel)52 esp_err_t dac_output_enable(dac_channel_t channel)
53 {
54 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
55
56 dac_rtc_pad_init(channel);
57 RTC_ENTER_CRITICAL();
58 dac_ll_power_on(channel);
59 dac_ll_rtc_sync_by_adc(false);
60 RTC_EXIT_CRITICAL();
61
62 return ESP_OK;
63 }
64
dac_output_disable(dac_channel_t channel)65 esp_err_t dac_output_disable(dac_channel_t channel)
66 {
67 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
68
69 RTC_ENTER_CRITICAL();
70 dac_ll_power_down(channel);
71 RTC_EXIT_CRITICAL();
72
73 return ESP_OK;
74 }
75
dac_output_voltage(dac_channel_t channel,uint8_t dac_value)76 esp_err_t dac_output_voltage(dac_channel_t channel, uint8_t dac_value)
77 {
78 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
79
80 RTC_ENTER_CRITICAL();
81 dac_ll_update_output_value(channel, dac_value);
82 RTC_EXIT_CRITICAL();
83
84 return ESP_OK;
85 }
86
dac_out_voltage(dac_channel_t channel,uint8_t dac_value)87 esp_err_t dac_out_voltage(dac_channel_t channel, uint8_t dac_value)
88 {
89 ESP_RETURN_ON_FALSE(channel < SOC_DAC_CHAN_NUM, ESP_ERR_INVALID_ARG, TAG, "DAC channel error");
90
91 RTC_ENTER_CRITICAL();
92 dac_ll_update_output_value(channel, dac_value);
93 RTC_EXIT_CRITICAL();
94
95 return ESP_OK;
96 }
97
dac_cw_generator_enable(void)98 esp_err_t dac_cw_generator_enable(void)
99 {
100 RTC_ENTER_CRITICAL();
101 periph_rtc_dig_clk8m_enable();
102 dac_ll_cw_generator_enable();
103 RTC_EXIT_CRITICAL();
104
105 return ESP_OK;
106 }
107
dac_cw_generator_disable(void)108 esp_err_t dac_cw_generator_disable(void)
109 {
110 RTC_ENTER_CRITICAL();
111 dac_ll_cw_generator_disable();
112 periph_rtc_dig_clk8m_disable();
113 RTC_EXIT_CRITICAL();
114
115 return ESP_OK;
116 }
117
dac_cw_generator_config(dac_cw_config_t * cw)118 esp_err_t dac_cw_generator_config(dac_cw_config_t *cw)
119 {
120 ESP_RETURN_ON_FALSE(cw, ESP_ERR_INVALID_ARG, TAG, "invalid clock configuration");
121 RTC_ENTER_CRITICAL();
122 /* Enable the rtc8m clock temporary to get the correct frequency */
123 periph_rtc_dig_clk8m_enable();
124 uint32_t rtc_freq = periph_rtc_dig_clk8m_get_freq();
125 periph_rtc_dig_clk8m_disable();
126 dac_ll_cw_set_freq(cw->freq, rtc_freq);
127 dac_ll_cw_set_atten(cw->en_ch, (dac_cosine_atten_t)cw->scale);
128 dac_ll_cw_set_phase(cw->en_ch, (dac_cosine_phase_t)cw->phase);
129 dac_ll_cw_set_dc_offset(cw->en_ch, cw->offset);
130 dac_ll_cw_enable_channel(cw->en_ch, true);
131 RTC_EXIT_CRITICAL();
132
133 return ESP_OK;
134 }
135
