GD32 — 数模转换器 (DAC) on CLing

GD32 DAC — DAC + ADC 转换

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

DAC — DAC + ADC 转换

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

功能简介

本示例演示 DAC 数模转换器的基本用法。DAC 将数字值转换为模拟电压输出，是生成模拟信号的关键外设。

完整代码

#include "gd32f30x.h"
#include "systick.h"

void rcu_config(void);
/* configure GPIO peripheral */
void gpio_config(void);
/* configure NVIC peripheral */
void nvic_config(void);
/* configure ADC peripheral */
void adc_config(void);
/* configure DAC peripheral */
void dac_config(void);

/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/
int main(void)
{
    /* configure systick */
    systick_config();

    /* configure RCU peripheral */
    rcu_config();
    /* configure GPIO peripheral */
    gpio_config();
    /* configure NVIC peripheral */
    nvic_config();
    /* configure DAC peripheral */
    dac_config();
    /* configure ADC peripheral */
    adc_config();

    while(1) {
    }
}

void rcu_config(void)
{
    /* enable GPIOA clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable GPIOC clock */
    rcu_periph_clock_enable(RCU_GPIOC);
    /* enable ADC clock */
    rcu_periph_clock_enable(RCU_ADC0);
    /* enable DAC clock */
    rcu_periph_clock_enable(RCU_DAC);
}

void gpio_config(void)
{
    /* configure PC3 as ADC input */
    gpio_init(GPIOC, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_3);

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

void nvic_config(void)
{
    nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2);
    nvic_irq_enable(ADC0_1_IRQn, 0, 0);
}

void adc_config(void)
{
    /* ADC continuous function enable */
    adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, ENABLE);
    /* ADC data alignment config */
    adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT);
    /* ADC channel length config */
    adc_channel_length_config(ADC0, ADC_ROUTINE_CHANNEL, 1);
    /* ADC routine channel config */
    adc_routine_channel_config(ADC0, 0, ADC_CHANNEL_13, ADC_SAMPLETIME_55POINT5);
    /* ADC external trigger enable */
    adc_external_trigger_config(ADC0, ADC_ROUTINE_CHANNEL, ENABLE);
    /* ADC trigger config */
    adc_external_trigger_source_config(ADC0, ADC_ROUTINE_CHANNEL, ADC0_1_2_EXTTRIG_ROUTINE_NONE);

    /* enable ADC interface */
    adc_enable(ADC0);
    delay_1ms(1);
    /* ADC calibration and reset calibration */
    adc_calibration_enable(ADC0);

    /* ADC interrupt enable */
    adc_interrupt_flag_clear(ADC0, ADC_INT_FLAG_EOC);
    adc_interrupt_enable(ADC0, ADC_INT_EOC);

    /* enable ADC software trigger */
    adc_software_trigger_enable(ADC0, ADC_ROUTINE_CHANNEL);
}

void dac_config(void)
{
    /* initialize DAC */
    dac_deinit(DAC0);
    /* DAC trigger config */
    dac_trigger_source_config(DAC0, DAC_OUT0, DAC_TRIGGER_SOFTWARE);
    /* DAC trigger enable */
    dac_trigger_enable(DAC0, DAC_OUT0);
    /* DAC wave mode config */
    dac_wave_mode_config(DAC0, DAC_OUT0, DAC_WAVE_DISABLE);
    /* DAC output buffer config */
    dac_output_buffer_enable(DAC0, DAC_OUT0);

    /* DAC enable */
    dac_enable(DAC0, DAC_OUT0);
}

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。

ADC 配置：选择采样通道、采样时间、触发方式、数据对齐方式。采样时间越长精度越高。

中断优先级配置：NVIC 设置中断的抢占优先级和子优先级。数字越小优先级越高。

校准：ADC 使用前必须校准，消除工艺偏差。校准期间不要操作 ADC。

GD32 DAC — DAC DMA 转换

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

DAC — DAC DMA 转换

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

功能简介

本示例演示 DAC 数模转换器的基本用法。DAC 将数字值转换为模拟电压输出，是生成模拟信号的关键外设。

完整代码

#include "gd32f30x.h"
#define CONVERT_NUM          (10)
#define DAC0_R8DH_ADDRESS    (0x40007410)

void rcu_config(void);
/* configure GPIO peripheral */
void gpio_config(void);
/* configure DMA peripheral */
void dma_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 DMA peripheral */
    dma_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 DMA clock */
    rcu_periph_clock_enable(RCU_DMA1);
    /* 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 dma_config(void)
{
    dma_parameter_struct dma_struct;
    /* clear all the interrupt flags */
    dma_flag_clear(DMA1, DMA_CH2, DMA_INTF_GIF);
    dma_flag_clear(DMA1, DMA_CH2, DMA_INTF_FTFIF);
    dma_flag_clear(DMA1, DMA_CH2, DMA_INTF_HTFIF);
    dma_flag_clear(DMA1, DMA_CH2, DMA_INTF_ERRIF);
    
    /* configure the DMA1 channel 2 */
    dma_struct.periph_addr  = DAC0_R8DH_ADDRESS;
    dma_struct.periph_width = DMA_PERIPHERAL_WIDTH_8BIT;
    dma_struct.memory_addr  = (uint32_t)convertarr;
    dma_struct.memory_width = DMA_MEMORY_WIDTH_8BIT;
    dma_struct.number       = CONVERT_NUM;
    dma_struct.priority     = DMA_PRIORITY_ULTRA_HIGH;
    dma_struct.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;
    dma_struct.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;
    dma_struct.direction    = DMA_MEMORY_TO_PERIPHERAL;
    dma_init(DMA1, DMA_CH2, &dma_struct);

    dma_circulation_enable(DMA1, DMA_CH2);
    dma_channel_enable(DMA1, DMA_CH2);
}

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_DISABLE);

    /* DAC enable */
    dac_enable(DAC0, DAC_OUT0);
    /* DAC DMA function enable */
    dac_dma_enable(DAC0, DAC_OUT0);
}

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。

DMA 配置：设置源地址、目标地址、传输方向、数据宽度。DMA 搬运数据不占用 CPU。

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。

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。

GD32 DAC — DAC 独立触发 LFSR 噪声

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

DAC — DAC 独立触发 LFSR 噪声

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/DAC/DACC_independent_trigger_LFSR_noise/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);
void timer6_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();
    timer6_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);
    rcu_periph_clock_enable(RCU_TIMER6);
}

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_T5_TRGO);
    dac_trigger_source_config(DAC0, DAC_OUT1, DAC_TRIGGER_T6_TRGO);
    /* 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);
}

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);
}

void timer6_config(void)
{
    timer_parameter_struct timer_initpara;

    /* TIMER deinitialize */
    timer_deinit(TIMER6);

    /* 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(TIMER6, &timer_initpara);

    /* TIMER master mode output trigger source: Update event */
    timer_master_output_trigger_source_select(TIMER6, TIMER_TRI_OUT_SRC_UPDATE);

    /* enable TIMER */
    timer_enable(TIMER6);
}

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。

GD32 DAC — DAC 软件触发 LFSR 噪声

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

DAC — DAC 软件触发 LFSR 噪声

固件库: GD32F30x_Firmware_Library V3.0.3
芯片: GD32
源文件: GD32F30x_Firmware_Library_V3.0.3/Examples/DAC/DACC_software_trigger_LFSR_noise/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);

/*!
    \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);
}

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。

GD32 DAC — DAC 三角噪声模式

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

DAC — DAC 三角噪声模式

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

功能简介

本示例演示 DAC 输出三角波。利用 DAC 内置的三角波生成器，无需 CPU 干预即可输出三角波。

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 PA5 as DAC output */
    gpio_init(GPIOA, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
}

void dac_config(void)
{
    /* initialize DAC */
    dac_deinit(DAC0);
    /* DAC trigger config */
    dac_trigger_source_config(DAC0, DAC_OUT1, DAC_TRIGGER_T5_TRGO);
    /* DAC trigger enable */
    dac_trigger_enable(DAC0, DAC_OUT1);
    /* DAC wave mode config */
    dac_wave_mode_config(DAC0, DAC_OUT1, DAC_WAVE_MODE_TRIANGLE);
    dac_triangle_noise_config(DAC0, DAC_OUT1, DAC_TRIANGLE_AMPLITUDE_2047);

    /* DAC enable */
    dac_enable(DAC0, DAC_OUT1);
    dac_data_set(DAC0, DAC_OUT1, 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。

GD32 DAC — DAC 输出电压

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

DAC — DAC 输出电压

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

功能简介

本示例演示 DAC 数模转换器的基本用法。DAC 将数字值转换为模拟电压输出，是生成模拟信号的关键外设。

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);

/*!
    \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) {
    }
}

void rcu_config(void)
{
    /* enable GPIOA clock */
    rcu_periph_clock_enable(RCU_GPIOA);
    /* enable DAC clock */
    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 disable */
    dac_trigger_disable(DAC0, DAC_OUT0);
    dac_trigger_disable(DAC0, DAC_OUT1);
    /* DAC wave mode config */
    dac_wave_mode_config(DAC0, DAC_OUT0, DAC_WAVE_DISABLE);
    dac_wave_mode_config(DAC0, DAC_OUT1, DAC_WAVE_DISABLE);

    /* DAC enable */
    dac_concurrent_enable(DAC0);
    dac_concurrent_data_set(DAC0, DAC_ALIGN_12B_L, 0x7FF0, 0x1FF0);
}

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。

GD32 DAC — DAC 同步触发三角噪声

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

DAC — DAC 同步触发三角噪声

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

功能简介

本示例演示 DAC 输出三角波。利用 DAC 内置的三角波生成器，无需 CPU 干预即可输出三角波。

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 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_T5_TRGO);
    dac_trigger_source_config(DAC0, DAC_OUT1, DAC_TRIGGER_T5_TRGO);
    /* 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_TRIANGLE);
    dac_triangle_noise_config(DAC0, DAC_OUT0, DAC_TRIANGLE_AMPLITUDE_1023);
    dac_wave_mode_config(DAC0, DAC_OUT1, DAC_WAVE_MODE_TRIANGLE);
    dac_triangle_noise_config(DAC0, DAC_OUT1, DAC_TRIANGLE_AMPLITUDE_1023);

    /* DAC enable */
    dac_concurrent_enable(DAC0);
    dac_concurrent_data_set(DAC0, DAC_ALIGN_12B_R, 0x7F0, 0x1F0);
}

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。

GD32 DAC — DAC 外部触发

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

DAC — DAC 外部触发

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

功能简介

本示例演示 DAC 数模转换器的基本用法。DAC 将数字值转换为模拟电压输出，是生成模拟信号的关键外设。

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 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);
}

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。