147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/*!
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\file main.c
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\brief ADC oversample shift example demo
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\version 2021-10-30, V1.0.0, firmware for GD32W51x
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*/
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/*
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Copyright (c) 2021, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "gd32w51x.h"
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#include "systick.h"
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#include <stdio.h>
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#include "gd32w515p_eval.h"
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#define BOARD_ADC_CHANNEL ADC_CHANNEL_0
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#define ADC_GPIO_PORT GPIOA
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#define ADC_GPIO_PIN GPIO_PIN_0
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uint16_t adc_value = 0U;
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void rcu_config(void);
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void gpio_config(void);
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void adc_config(void);
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/*!
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\brief main function
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\param[in] none
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\param[out] none
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\retval none
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*/
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int main(void)
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{
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/* system clocks configuration */
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rcu_config();
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/* systick configuration */
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systick_config();
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/* GPIO configuration */
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gpio_config();
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/* ADC configuration */
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adc_config();
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/* configures COM port */
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gd_eval_com_init(EVAL_COM0);
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/* enable ADC software trigger for regular channel */
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adc_software_trigger_enable(ADC_REGULAR_CHANNEL);
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while(1){
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adc_flag_clear(ADC_FLAG_EOC);
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while(SET != adc_flag_get(ADC_FLAG_EOC)){
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}
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adc_value = ADC_RDATA;
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printf("\r\n*ADC oversample shift example demo*\r\n");
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printf("16 times sample, 4 bits shift: 0x%X\r\n", adc_value);
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delay_1ms(1000U);
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}
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}
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/*!
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\brief configure the different system clocks
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\param[in] none
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\param[out] none
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\retval none
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*/
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void rcu_config(void)
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{
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/* enable GPIOC clock */
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rcu_periph_clock_enable(RCU_GPIOA);
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/* config ADC clock */
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rcu_periph_clock_enable(RCU_ADC);
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adc_clock_config(ADC_ADCCK_HCLK_DIV6);
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}
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/*!
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\brief configure the GPIO peripheral
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\param[in] none
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\param[out] none
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\retval none
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*/
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void gpio_config(void)
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{
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/* config the GPIO as analog mode */
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gpio_mode_set(ADC_GPIO_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, ADC_GPIO_PIN);
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}
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/*!
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\brief configure the ADC peripheral
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\param[in] none
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\param[out] none
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\retval none
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*/
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void adc_config(void)
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{
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/* ADC contineous function disable */
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adc_special_function_config(ADC_CONTINUOUS_MODE, ENABLE);
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/* ADC data alignment config */
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adc_data_alignment_config(ADC_DATAALIGN_RIGHT);
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/* ADC external trigger enable */
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adc_external_trigger_config(ADC_REGULAR_CHANNEL, EXTERNAL_TRIGGER_DISABLE);
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/* ADC channel length config */
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adc_channel_length_config(ADC_REGULAR_CHANNEL, 1U);
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/* ADC inserted channel config */
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adc_regular_channel_config(0U, BOARD_ADC_CHANNEL, ADC_SAMPLETIME_55POINT5);
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/* 16 times sample, 4 bits shift */
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adc_oversample_mode_config(ADC_OVERSAMPLING_ALL_CONVERT, ADC_OVERSAMPLING_SHIFT_4B, ADC_OVERSAMPLING_RATIO_MUL16);
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adc_oversample_mode_enable();
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/* enable ADC interface */
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adc_enable();
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/* wait for ADC stability */
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delay_1ms(1);
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}
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/* retarget the C library printf function to the USART */
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int fputc(int ch, FILE *f)
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{
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usart_data_transmit(EVAL_COM0, (uint8_t)ch);
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while(RESET == usart_flag_get(EVAL_COM0, USART_FLAG_TBE));
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return ch;
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}
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