stm32怎么驱动ws2812,简单程序,中文详细注释
时间: 2023-11-29 09:04:21 浏览: 45
好的,下面是一个中文详细注释的STM32驱动WS2812的简单程序:
```c
#include "stm32f10x.h"
#define LED_NUM 8 // LED的数量
#define LED_SIZE 24 // 每个LED的颜色值占用的位数,即RGB三个颜色值各占用8位,一共24位
#define LED_BUFFER_SIZE (LED_NUM * LED_SIZE) // LED缓存区的大小
uint8_t ledBuffer[LED_BUFFER_SIZE]; // LED缓存区,用于存储每个LED的颜色值
/**
* @brief 初始化WS2812
*/
void WS2812_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
DMA_InitTypeDef DMA_InitStructure;
// 使能GPIOB的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// 配置GPIOB的Pin0引脚为复用推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 使能TIM3的时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
// 配置TIM3的输入时钟为APB1的2倍,即72MHz
RCC_TIMCLKPresConfig(RCC_TIMPrescActivated);
// 配置TIM3的基本定时器模式
TIM_TimeBaseStructure.TIM_Period = 89; // 计数器值为89时产生一个PWM周期,对应T0H+T0L=1.25us+0.55us
TIM_TimeBaseStructure.TIM_Prescaler = 35; // 时钟预分频系数为36,即设置为1MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// 配置TIM3的PWM输出为通道3
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
// 使能TIM3的DMA请求
TIM_DMAConfig(TIM3, TIM_DMABase_CCR3, TIM_DMABurstLength_1Transfer);
TIM_DMACmd(TIM3, TIM_DMA_CC3, ENABLE);
// 使能DMA1的时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
// 配置DMA1的通道2为存储器到外设模式,由TIM3_CH3触发
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(TIM3->CCR3);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ledBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = LED_BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
// 使能DMA1通道2
DMA_Cmd(DMA1_Channel2, ENABLE);
// 使能TIM3
TIM_Cmd(TIM3, ENABLE);
}
/**
* @brief 设置某个LED的颜色值
* @param ledIndex LED的编号,从0开始
* @param red 红色分量的值,0~255
* @param green 绿色分量的值,0~255
* @param blue 蓝色分量的值,0~255
*/
void WS2812_SetColor(uint8_t ledIndex, uint8_t red, uint8_t green, uint8_t blue)
{
uint32_t offset = ledIndex * LED_SIZE; // 计算偏移量
uint8_t i;
// 根据颜色值设置LED缓存区的数据
for (i = 0; i < 8; i++) {
if (green & (1 << i)) {
ledBuffer[offset + i] = 0xF0;
} else {
ledBuffer[offset + i] = 0xC0;
}
}
for (i = 0; i < 8; i++) {
if (red & (1 << i)) {
ledBuffer[offset + i + 8] = 0xF0;
} else {
ledBuffer[offset + i + 8] = 0xC0;
}
}
for (i = 0; i < 8; i++) {
if (blue & (1 << i)) {
ledBuffer[offset + i + 16] = 0xF0;
} else {
ledBuffer[offset + i + 16] = 0xC0;
}
}
}
int main(void)
{
WS2812_Init(); // 初始化WS2812
// 设置前三个LED的颜色值为红色、绿色和蓝色
WS2812_SetColor(0, 255, 0, 0); // 红色
WS2812_SetColor(1, 0, 255, 0); // 绿色
WS2812_SetColor(2, 0, 0, 255); // 蓝色
while (1) {
// 死循环,不做任何操作
}
}
```
在上面的代码中,我们通过STM32的定时器和DMA模块来驱动WS2812。在WS2812_Init()函数中,我们初始化了GPIO引脚、定时器、PWM输出和DMA通道等,使得STM32能够向WS2812发送数据。在WS2812_SetColor()函数中,我们根据RGB三个颜色分量的值来设置LED的颜色值,具体实现可以参考WS2812的数据传输协议。在主函数中,我们设置了前三个LED的颜色值为红色、绿色和蓝色,并且进入了一个死循环,保持程序的运行。