请教ch32v103c8t6驱动WS2812B问题

只看该作者 · 2022-10-25 17:03

各位大佬好，我使用PWM+DMA的方式驱动RGB,实现简单的流水灯效果，但是灯效太快。通过delay的调节速度，效果不理想，甚至没有流水效果。代码如下：

#include "ch32v10x.h"

#define T0H 30
#define T1H 60
#define LED_NUM 16
#define DATA_NUM 24

u16 RGB[DATA_NUM *LED_NUM] ;

void TIM1_PWMOUTPUT_Init(u16 arr, u16 psc, u16 ccp)
{
GPIO_InitTypeDef GPIO_InitStruct  ;       //GPIO结构体与TIMBase结构体未初始化，暂时没看出问题
TIM_OCInitTypeDef TIM_OCInitStruct = {0} ;    // PWM结构体必须初始化
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct = {0} ;    //这个结构体不初始化，无法点亮灯具体原因未知

//时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

//引脚
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStruct.GPIO_Speed =GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);

//TIM1
TIM_TimeBaseInitStruct.TIM_Period = arr - 1;
TIM_TimeBaseInitStruct.TIM_Prescaler = psc;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);

//PWM
TIM_OCInitStruct.TIM_Pulse = ccp;
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
// TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStruct);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM1, ENABLE);

}

void DMA1_Init()
{
DMA_InitTypeDef DMA_InitStruct ;    //如果这个结构体初始化，第一个灯将会最后亮

//时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

//DMA
DMA_DeInit(DMA1_Channel2);
DMA_InitStruct.DMA_PeripheralBaseAddr = (u32)&(TIM1->CH1CVR);
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryBaseAddr = (u32)RGB;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;       //地址不变将会卡在dma数组的0号位置
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStruct.DMA_BufferSize = DATA_NUM;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
DMA_InitStruct.DMA_Priority = DMA_Priority_Medium;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStruct);

TIM_DMACmd(TIM1, TIM_DMA_CC1, ENABLE);
}

void Reset()
{

}

void COlors(u16 num, u32 rgb)
{
u8 i,j;
for(j = 0; j < num; j++)
{
      for(i = 0; i <8; i++)             //GRB格式发送，数组已对GRB编码顺序，改为RGB顺序
      {                                                                      //数组需从24后开始，不然第一个灯亮不了
         RGB[j * 24 + i + 8] = ((rgb >> 8 >> 8 >> i) & 0x1) ? T1H : T0H;    //GREEN
         RGB[j *24 + i] = ((rgb >> 8 >> i) & 0x1) ? T1H : T0H;             //RED
         RGB[j * 24 + i +16] = ((rgb >> i) & 0x1) ? T1H : T0H;             //BLUE
      }
}
}

void PWM_Show(u16 num)
{
DMA_SetCurrDataCounter(DMA1_Channel2, num * DATA_NUM);
DMA_Cmd(DMA1_Channel2, ENABLE);
TIM_Cmd(TIM1, ENABLE);
while(DMA_GetFlagStatus(DMA1_FLAG_TC2) != SET);
DMA_Cmd(DMA1_Channel2, DISABLE);
TIM_Cmd(TIM1, DISABLE);
DMA_ClearFlag(DMA1_FLAG_TC2);
}

u8 i;

int main(void)
{
Delay_Init();
TIM1_PWMOUTPUT_Init(90, 0, 0);
DMA1_Init();
while(1)
{
      for(i = 0; i < 16; i++)
      {
         COlors(i+1, 0xff0000);
         PWM_Show(i+1);
         Delay_Ms(10);
      }

      for(i = 0; i < 16; i++)
      {
         COlors(i+1, 0x00ff00);
         PWM_Show(i+1);
         Delay_Ms(10);
      }

      for(i = 0; i < 16; i++)
      {
         COlors(i+1, 0x0000ff);
         PWM_Show(i+1);
         Delay_Ms(10);
      }
}
}

请问程序有哪些可以改进的，谢谢各位大佬

请教ch32v103c8t6驱动WS2812B问题

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