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#include "gd32f30x.h"
void rcu_config(void);
/* configure GPIO peripheral */
void gpio_config(void);
/* configure DAC peripheral */
void dac_config(void);
/* configure EXTI line */
void exti_line9_config(void);
/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{
/* configure RCU peripheral */
rcu_config();
/* configure GPIO peripheral */
gpio_config();
/* configure DAC peripheral */
dac_config();
/* configure EXTI line */
exti_line9_config();
while (1) {
}
}
void rcu_config(void)
{
/* enable GPIOA clock */
rcu_periph_clock_enable(RCU_GPIOA);
/* enable DAC clock */
rcu_periph_clock_enable(RCU_DAC);
/* enable AFIO clock */
rcu_periph_clock_enable(RCU_AF);
}
void gpio_config(void)
{
/* configure PA4 as DAC output */
gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_4);
/* configure PA9 as EXTI input */
gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
}
void dac_config(void)
{
/* initialize DAC */
dac_deinit(DAC0);
/* DAC trigger config */
dac_trigger_source_config(DAC0, DAC_OUT0, DAC_TRIGGER_EXTI_9);
/* DAC trigger enable */
dac_trigger_enable(DAC0,DAC_OUT0);
/* DAC wave mode config */
dac_wave_mode_config(DAC0, DAC_OUT0, DAC_WAVE_MODE_LFSR);
dac_lfsr_noise_config(DAC0, DAC_OUT0, DAC_LFSR_BITS11_0);
/* DAC enable */
dac_enable(DAC0,DAC_OUT0);
dac_data_set(DAC0, DAC_OUT0, DAC_ALIGN_12B_R, 0);
}
void exti_line9_config(void)
{
/* connect key EXTI line to key GPIO pin */
gpio_exti_source_select(GPIO_PORT_SOURCE_GPIOA, GPIO_PIN_SOURCE_9);
/* configure key EXTI line */
exti_init(EXTI_9, EXTI_EVENT, EXTI_TRIG_RISING);
exti_flag_clear(EXTI_9);
}
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