155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-02-25 iysheng first version
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* 2022-04-13 wangh adc init and convert bug fix
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*/
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#include <board.h>
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#ifdef RT_USING_ADC
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#define DBG_TAG "drv.adc"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#define MAX_EXTERN_ADC_CHANNEL 16
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typedef struct
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{
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struct rt_adc_device adc_dev;
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char name[8];
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rt_base_t adc_pins[16];
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void *private_data;
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} gd32_adc_device;
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static gd32_adc_device adc_devs[] = {
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#ifdef BSP_USING_ADC0
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{
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.name = "adc0",
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.adc_pins = {
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GET_PIN(A, 0), GET_PIN(A, 1), GET_PIN(A, 2), GET_PIN(A, 3),
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GET_PIN(A, 4), GET_PIN(A, 5), GET_PIN(A, 6), GET_PIN(A, 7),
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GET_PIN(B, 0), GET_PIN(B, 1), GET_PIN(C, 0), GET_PIN(C, 1),
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GET_PIN(C, 2), GET_PIN(C, 3), GET_PIN(C, 4), GET_PIN(C, 5),
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},
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.private_data = (void *)ADC0,
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},
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#endif
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#ifdef BSP_USING_ADC1
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{
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.name = "adc1",
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.adc_pins = {
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GET_PIN(A, 0), GET_PIN(A, 1), GET_PIN(A, 2), GET_PIN(A, 3),
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GET_PIN(A, 4), GET_PIN(A, 5), GET_PIN(A, 6), GET_PIN(A, 7),
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GET_PIN(B, 0), GET_PIN(B, 1), GET_PIN(C, 0), GET_PIN(C, 1),
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GET_PIN(C, 2), GET_PIN(C, 3), GET_PIN(C, 4), GET_PIN(C, 5),
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},
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.private_data = (void *)ADC1,
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},
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#endif
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};
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static void gd32_adc_gpio_init(rt_base_t pin)
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{
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rcu_periph_clock_enable((rcu_periph_enum)PIN_GDRCU(pin));
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gpio_init(PIN_GDPORT(pin), GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, PIN_GDPIN(pin));
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}
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static rt_err_t drv_adc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled)
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{
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if ((device == NULL) || (channel >= MAX_EXTERN_ADC_CHANNEL))
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{
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LOG_E("invalid channel\r\n");
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return -RT_EINVAL;
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}
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gd32_adc_device *gd32_adc = (gd32_adc_device *)device;
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uint32_t adc_periph = (uint32_t )(device->parent.user_data);
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if (enabled == ENABLE)
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{
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gd32_adc_gpio_init(gd32_adc->adc_pins[channel]);
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adc_deinit(adc_periph);
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adc_channel_length_config(adc_periph, ADC_REGULAR_CHANNEL, 1);
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adc_data_alignment_config(adc_periph, ADC_DATAALIGN_RIGHT); /* 数据右对齐 */
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adc_external_trigger_config(adc_periph, ADC_REGULAR_CHANNEL, ENABLE); /* 规则组外部触发使能 */
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adc_external_trigger_source_config(adc_periph, ADC_REGULAR_CHANNEL, ADC0_1_2_EXTTRIG_REGULAR_NONE);
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adc_special_function_config(adc_periph, ADC_SCAN_MODE, DISABLE); /* 扫描模式禁止，单通道模式 */
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adc_special_function_config(adc_periph, ADC_CONTINUOUS_MODE, DISABLE); /* 连续转换禁止，单次转换模式 */
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adc_discontinuous_mode_config(adc_periph, ADC_REGULAR_CHANNEL, 1); /* 规则组间断使能及转换通道数目 */
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adc_enable(adc_periph);
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rt_hw_us_delay(500);
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adc_calibration_enable(adc_periph); /* ADC自校准 */
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}
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else
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{
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adc_disable(adc_periph);
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}
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return 0;
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}
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static rt_err_t drv_adc_convert(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value)
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{
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if ((device == NULL) || (channel >= MAX_EXTERN_ADC_CHANNEL) || (value == NULL))
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{
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LOG_E("invalid param\r\n");
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return -RT_EINVAL;
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}
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uint32_t adc_periph = (uint32_t )(device->parent.user_data);
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adc_regular_channel_config(adc_periph, 0, channel, ADC_SAMPLETIME_239POINT5);
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adc_software_trigger_enable(adc_periph, ADC_REGULAR_CHANNEL);
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while(!adc_flag_get(adc_periph, ADC_FLAG_EOC)); /* 等待ADC转换完成 */
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adc_flag_clear(adc_periph, ADC_FLAG_EOC); /* 清除转换完成标志位 */
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adc_flag_clear(adc_periph, ADC_FLAG_STRC);
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*value = adc_regular_data_read(adc_periph);
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return 0;
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}
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static struct rt_adc_ops drv_adc_ops = {
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.enabled = drv_adc_enabled,
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.convert = drv_adc_convert,
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};
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static int rt_hw_adc_init(void)
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{
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int ret, i = 0;
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#ifdef BSP_USING_ADC0
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rcu_periph_clock_enable(RCU_ADC0);
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#endif
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#ifdef BSP_USING_ADC1
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rcu_periph_clock_enable(RCU_ADC1);
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#endif
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rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV6); /* 72/6 = 12MHz need < 14MHZ */
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adc_mode_config(ADC_MODE_FREE);
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for (; i < sizeof(adc_devs) / sizeof(gd32_adc_device); i++)
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{
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ret = rt_hw_adc_register(&adc_devs[i].adc_dev,
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(const char *)adc_devs[i].name,
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&drv_adc_ops, (void *)adc_devs[i].private_data);
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if (ret != RT_EOK)
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{
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/* TODO err handler */
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LOG_E("failed register %s, err=%d\r\n", adc_devs[i].name, ret);
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}
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}
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return ret;
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}
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INIT_BOARD_EXPORT(rt_hw_adc_init);
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#endif
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