stm32点亮ws2812b的函数
时间: 2023-07-27 08:06:05 浏览: 40
以下是使用STM32控制WS2812B LED的示例代码:
```
#include "stm32f4xx.h"
// 定义LED灯的数量
#define LED_NUM 10
// 定义LED数据的缓冲区
uint8_t LED_Buffer[LED_NUM * 24];
// 定义定时器中断标志位
volatile uint8_t Interrupt_Flag = 0;
// 定义WS2812B LED控制函数
void WS2812B_Send(uint8_t *LedData, uint16_t DataSize)
{
uint16_t i = 0, j = 0;
for(i = 0; i < DataSize; i++)
{
// 发送一位数据
for(j = 0; j < 8; j++)
{
if(LedData[i] & (1 << (7 - j)))
{
// 发送高电平
GPIO_SetBits(GPIOA, GPIO_Pin_1);
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
else
{
// 发送低电平
GPIO_SetBits(GPIOA, GPIO_Pin_1);
asm("nop");
asm("nop");
GPIO_ResetBits(GPIOA, GPIO_Pin_1);
}
}
}
}
// 定义定时器中断服务函数
void TIM3_IRQHandler(void)
{
if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
{
Interrupt_Flag = 1;
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
}
}
int main(void)
{
uint16_t i = 0, j = 0, k = 0;
// 初始化PA1为输出模式
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 初始化定时器
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 89;
TIM_TimeBaseStructure.TIM_Prescaler = 3;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 启动定时器
TIM_Cmd(TIM3, ENABLE);
while(1)
{
if(Interrupt_Flag)
{
Interrupt_Flag = 0;
for(i = 0; i < LED_NUM; i++)
{
// 将颜色数据存入LED数据缓冲区
for(j = 0; j < 3; j++)
{
for(k = 0; k < 8; k++)
{
if((i % 2) == 0)
{
if((j == 0) && (k == 7))
{
LED_Buffer[i * 24 + j * 8 + k] = 0xFF;
}
else
{
LED_Buffer[i * 24 + j * 8 + k] = 0x00;
}
}
else
{
if((j == 1) && (k == 7))
{
LED_Buffer[i * 24 + j * 8 + k] = 0xFF;
}
else
{
LED_Buffer[i * 24 + j * 8 + k] = 0x00;
}
}
}
}
}
// 发送LED数据
WS2812B_Send(LED_Buffer, LED_NUM * 24);
}
}
}
```
这个程序使用了STM32的定时器和GPIO模块来控制WS2812B LED。在主循环中,程序不断地往LED数据缓冲区中写入颜色数据,并通过定时器中断来触发数据发送。在发送数据的过程中,程序通过GPIO模块来控制数据线的高低电平,从而实现对WS2812B LED的控制。