/*! \file main.c \brief ADC resolution demo */ /* Copyright (C) 2017 GigaDevice 2014-12-26, V1.0.0, platform GD32F1x0(x=3,5) 2016-01-15, V2.0.0, platform GD32F1x0(x=3,5,7,9) 2016-04-30, V3.0.0, firmware update for GD32F1x0(x=3,5,7,9) 2017-06-19, V3.1.0, firmware update for GD32F1x0(x=3,5,7,9) */ #include "gd32f1x0.h" #include "systick.h" #include #include "gd32f1x0_eval.h" #define BOARD_ADC_CHANNEL ADC_CHANNEL_10 #define ADC_GPIO_PORT GPIOC #define ADC_GPIO_PIN GPIO_PIN_0 uint16_t adc_value; void rcu_config(void); void gpio_config(void); void nvic_config(void); void adc_config(void); /*! \brief main function \param[in] none \param[out] none \retval none */ int main(void) { /* system clocks configuration */ rcu_config(); /* systick configuration */ systick_config(); /* GPIO configuration */ gpio_config(); /* NVIC configuration */ nvic_config(); /* configures COM port */ gd_eval_com_init(EVAL_COM1); /* ADC configuration */ adc_config(); adc_software_trigger_enable(ADC_REGULAR_CHANNEL); while(1){ adc_flag_clear(ADC_FLAG_EOC); while(SET != adc_flag_get(ADC_FLAG_EOC)){ } adc_value = ADC_RDATA; printf("6B: 0x%x\r\n", adc_value); delay_1ms(500); } } /*! \brief configure the different system clocks \param[in] none \param[out] none \retval none */ void rcu_config(void) { /* enable GPIOC clock */ rcu_periph_clock_enable(RCU_GPIOC); /* enable ADC clock */ rcu_periph_clock_enable(RCU_ADC); /* config ADC clock */ rcu_adc_clock_config(RCU_ADCCK_APB2_DIV6); } /*! \brief configure the GPIO peripheral \param[in] none \param[out] none \retval none */ void gpio_config(void) { /* config the GPIO as analog mode */ gpio_mode_set(ADC_GPIO_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, ADC_GPIO_PIN); } /*! \brief configure interrupt priority \param[in] none \param[out] none \retval none */ void nvic_config(void) { nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2); nvic_irq_enable(ADC_CMP_IRQn, 0, 0); } /*! \brief configure the ADC peripheral \param[in] none \param[out] none \retval none */ void adc_config(void) { /* ADC contineous function enable */ adc_special_function_config(ADC_CONTINUOUS_MODE, ENABLE); /* ADC trigger config */ adc_external_trigger_source_config(ADC_REGULAR_CHANNEL, ADC_EXTTRIG_REGULAR_SWRCST); /* ADC data alignment config */ adc_data_alignment_config(ADC_DATAALIGN_RIGHT); /* ADC channel length config */ adc_channel_length_config(ADC_REGULAR_CHANNEL, 1); /* ADC regular channel config */ adc_regular_channel_config(0, BOARD_ADC_CHANNEL, ADC_SAMPLETIME_55POINT5); adc_external_trigger_config(ADC_REGULAR_CHANNEL, ENABLE); /* ADC resolusion 6B */ printf("\r\nresolusion 6B:\r\n"); adc_resolution_config(ADC_RESOLUTION_6B); /* enable ADC interface */ adc_enable(); delay_1ms(1); /* ADC calibration and reset calibration */ adc_calibration_enable(); } /* retarget the C library printf function to the USART */ int fputc(int ch, FILE *f) { usart_data_transmit(EVAL_COM1, (uint8_t)ch); while(RESET == usart_flag_get(EVAL_COM1, USART_FLAG_TBE)); return ch; }