GD32 DAC — DAC LFSR 噪声模式

Tue, 08 Sep 2026 14:52:21 +0800

DAC — DAC LFSR 噪声模式

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/DAC/DAC_LFSR_noise_mode/main.c

功能简介

本示例演示 DAC 噪声波生成。利用 LFSR（线性反馈移位寄存器）生成伪噪声信号，可用于音频测试等场景。

完整代码

#include "gd32f30x.h"

void rcu_config(void);
/* configure GPIO peripheral */
void gpio_config(void);
/* configure DAC peripheral */
void dac_config(void);
/* configure TIMER peripheral */
void timer5_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 TIMER peripheral */
    timer5_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 TIMER clock */
    rcu_periph_clock_enable(RCU_TIMER5);
}

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

void dac_config(void)
{
    /* initialize DAC */
    dac_deinit(DAC0);
    /* DAC trigger config */
    dac_trigger_source_config(DAC0, DAC_OUT0, DAC_TRIGGER_T5_TRGO);
    /* 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_BITS10_0);

    /* DAC enable */
    dac_enable(DAC0, DAC_OUT0);
    dac_data_set(DAC0, DAC_OUT0, DAC_ALIGN_12B_R, 0x7F0);
}

void timer5_config(void)
{
    timer_parameter_struct timer_initpara;

    /* TIMER deinitialize */
    timer_deinit(TIMER5);

    /* TIMER configuration */
    timer_struct_para_init(&timer_initpara);
    timer_initpara.prescaler         = 119;
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;
    timer_initpara.period            = 999;
    timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;
    timer_initpara.repetitioncounter = 0;

    /* initialize TIMER init parameter struct */
    timer_init(TIMER5, &timer_initpara);

    /* TIMER master mode output trigger source: Update event */
    timer_master_output_trigger_source_select(TIMER5, TIMER_TRI_OUT_SRC_UPDATE);

    /* enable TIMER */
    timer_enable(TIMER5);
}

代码讲解

GPIO 配置：设置引脚为输出/输入模式，选择推挽/开漏输出，配置上拉/下拉。

定时器配置：设置预分频器（PSC）和重装载值（ARR），定时时间 = (PSC+1) × (ARR+1) / 时钟频率。

DAC_LFSR_noise_mode on CLing

GD32 DAC — DAC LFSR 噪声模式

DAC — DAC LFSR 噪声模式

功能简介

完整代码

代码讲解