DAC — DAC 软件触发 LFSR 噪声

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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);

/*!
    \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();

    while(1) {
        /* DAC software trigger enable */
        dac_concurrent_software_trigger_enable(DAC0);
    }
}

void rcu_config(void)
{
    /* enable the clock of peripherals */
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_DAC);
}

void gpio_config(void)
{
    /* configure PA4 and PA5 as DAC output */
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_4 | GPIO_PIN_5);
}

void dac_config(void)
{
    /* initialize DAC */
    dac_deinit(DAC0);
    /* DAC trigger config */
    dac_trigger_source_config(DAC0, DAC_OUT0, DAC_TRIGGER_SOFTWARE);
    dac_trigger_source_config(DAC0, DAC_OUT1, DAC_TRIGGER_SOFTWARE);
    /* DAC trigger enable */
    dac_trigger_enable(DAC0, DAC_OUT0);
    dac_trigger_enable(DAC0, DAC_OUT1);
    /* DAC wave mode config */
    dac_wave_mode_config(DAC0, DAC_OUT0, DAC_WAVE_MODE_LFSR);
    dac_lfsr_noise_config(DAC0, DAC_OUT0, DAC_LFSR_BITS9_0);
    dac_wave_mode_config(DAC0, DAC_OUT1, DAC_WAVE_MODE_LFSR);
    dac_lfsr_noise_config(DAC0, DAC_OUT1, DAC_LFSR_BITS10_0);

    /* DAC enable */
    dac_concurrent_enable(DAC0);
    dac_concurrent_data_set(DAC0, DAC_ALIGN_12B_R, 0x7F0, 0x7F0);
}