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- 2019-1-2
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现在手头做的项目是用WS2812做一系列灯效,然后使用了DMA的方式驱动WS2812,内存到寄存器,但是只要开启定时器之后,这个WS2812就会一直抖动,有人遇到过这种问题吗,一起探讨一下。void Timer2_init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* GPIOA Configuration: TIM2 Channel 1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Compute the prescaler value */
//PrescalerValue = (uint16_t) (SystemCoreClock / 24000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 78-1; // 800kHz //原来是90-1
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
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_OC1Init(TIM2, &TIM_OCInitStructure);
/* configure DMA */
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* DMA1 Channel6 Config */
DMA_DeInit(DMA1_Channel2);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR1_Address; // physical address of Timer 3 CCR1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED_BYTE_Buffer; // this is the buffer memory
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // data shifted from memory to peripheral
DMA_InitStructure.DMA_BufferSize = 50;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // automatically increase buffer index
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // stop DMA feed after buffer size is reached
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
/* TIM3 CC1 DMA Request enable */
TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE);
}
void WS2812_send( uint8_t (*color)[3], uint16_t num)
{
uint8_t i;
//uint16_t memaddr;
uint16_t memaddr2=0;
// uint16_t buffersize;
// buffersize = (num*24)+10; // number of bytes needed is #LEDs * 24 bytes + 42 trailing bytes
// memaddr = 0; // reset buffer memory index
memaddr2 = num*24;
//memset(LED_BYTE_Buffer,0,sizeof(LED_BYTE_Buffer));
//第几个灯,设置颜色
for(i=0; i<8; i++) // GREEN data
{
LED_BYTE_Buffer[memaddr2] = ((color[0][1]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr2++;
//delay_us(10);
}
for(i=0; i<8; i++) // RED
{
LED_BYTE_Buffer[memaddr2] = ((color[0][0]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr2++;
//delay_us(10);
}
for(i=0; i<8; i++) // BLUE
{
LED_BYTE_Buffer[memaddr2] = ((color[0][2]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr2++;
//delay_us(10);
}
//===================================================================//
//bug:最后一个周期波形不知道为什么全是高电平,故增加一个波形
// LED_BYTE_Buffer[memaddr2] = ((color[0][2]<<8) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
//===================================================================//
// memaddr2++;
// while(memaddr2 < buffersize)
{
// LED_BYTE_Buffer[memaddr2] = 0;
// memaddr2++;
}
WS_SendData(buffersize);
}
void WS_SendData(uint16_t buffsize){
DMA_SetCurrDataCounter(DMA1_Channel2, buffsize); // load number of bytes to be transferred
DMA_Cmd(DMA1_Channel2, ENABLE); // enable DMA channel 6
TIM_Cmd(TIM2, ENABLE); // enable Timer 3
while(!DMA_GetFlagStatus(DMA1_FLAG_TC2)) ; // wait until transfer complete
TIM_Cmd(TIM2, DISABLE); // disable Timer 3
DMA_Cmd(DMA1_Channel2, DISABLE); // disable DMA channel 6
DMA_ClearFlag(DMA1_FLAG_TC2); // clear DMA1 Channel 6 transfer complete flag
}
这是我WS2812使用DMA方式的驱动,然后只要开了定时中断这个传输就会出现问题,我找不到头绪去解决,来几个大神一起讨论一下
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