1. C语言实现
使用定时器和DAC
```c
include "stm32f10x_tim.h"
include "stm32f10x_dac.h"
define SAMPLE_RATE 10000 // 采样率10kHz=10000Hz
define UP_TIME 0.5 // 上升时间比周期
void TriangleWave_GPIO_Init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void TriangleWave_Init(void) {
DAC_InitTypeDef DAC_InitStructure;
DAC_Cmd(DAC_Channel_1, ENABLE);
DAC_Cmd(DAC_Channel_2, ENABLE);
DAC_SetDualChannelData(DAC_Align_12b_R, 0x00, 0x00); // 设置波谷为0
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;
DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_4095;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
DAC_Init(DAC_Channel_2, &DAC_InitStructure);
}
void TriangleWave_Update(void) {
static uint16_t counter = 0;
static uint16_t value1 = 0;
static uint16_t value2 = 0;
counter++;
if (counter % SAMPLE_RATE < (SAMPLE_RATE * UP_TIME)) {
value1 = counter * 4095 / SAMPLE_RATE;
} else {
value1 = 4095 - (counter - SAMPLE_RATE * UP_TIME) * 4095 / SAMPLE_RATE;
}
if (counter % SAMPLE_RATE < (SAMPLE_RATE * (1 - UP_TIME))) {
value2 = counter * 4095 / SAMPLE_RATE;
} else {
value2 = 4095 - (counter - SAMPLE_RATE * (1 - UP_TIME)) * 4095 / SAMPLE_RATE;
}
DAC_SetDualChannelData(DAC_Align_12b_R, value1, value2);
}
int main(void) {
TriangleWave_GPIO_Init();
TriangleWave_Init();
while (1) {
TriangleWave_Update();
}
return 0;
}
```
2. Verilog实现
使用FPGA的DAC模块