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最近在学习WS2812灯环，遇到一个奇怪的现象，就是有一个灯的颜色始终与其它灯的颜色不同【其它的灯的颜色是可以同步的】，不知道这个问题是由什么引起的？
代码如下（来源网络）：
[mw_shl_code=c,true]#include "WS2812B.h"
/* Buffer that holds one complete DMA transmission
*
* Ensure that this buffer is big enough to hold
* all data bytes that need to be sent
*
* The buffer size can be calculated as follows:
* number of LEDs * 24 bytes + 42 bytes
*
* This leaves us with a maximum string length of
* (2^16 bytes per DMA stream - 42 bytes)/24 bytes per LED = 2728 LEDs
*/
//#define TIM3_CCR3_Address 0x4000043c // physical memory address of Timer 3 CCR1 register
//#define TIM3_CCR1_Address 0x40000434 // physical memory address of Timer 3 CCR1 register
#define TIM2_CCR1_Address 0x40000034
#define TIMING_ONE 50
#define TIMING_ZERO 25
uint16_t LED_BYTE_Buffer[300];
//---------------------------------------------------------------//
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 = 90-1; // 800kHz
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 = 42;
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);
}
/* This function sends data bytes out to a string of WS2812s
* The first argument is a pointer to the first RGB triplet to be sent
* The seconds argument is the number of LEDs in the chain
*
* This will result in the RGB triplet passed by argument 1 being sent to
* the LED that is the furthest away from the controller (the point where
* data is injected into the chain)
*/
void WS2812_send(uint8_t (*color)[3], uint16_t len)
{
uint8_t i;
uint16_t memaddr;
uint16_t buffersize;
buffersize = (len*24)+43+48; // number of bytes needed is #LEDs * 24 bytes + 42 trailing bytes
memaddr = 0; // reset buffer memory index
for(i=0; i<48; i++) // GREEN data
{
LED_BYTE_Buffer[memaddr] = ((0<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
while (len)
{
for(i=0; i<8; i++) // GREEN data
{
LED_BYTE_Buffer[memaddr] = ((color[0][1]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // RED
{
LED_BYTE_Buffer[memaddr] = ((color[0][0]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // BLUE
{
LED_BYTE_Buffer[memaddr] = ((color[0][2]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
len--;
}
//===================================================================//
//bug￡o×îoóò»¸öÖüÆú2¨DÎ2»ÖaμàÎaê2Ã′è«êǸßμçƽ￡¬1êÔö¼óò»¸ö2¨DÎ
LED_BYTE_Buffer[memaddr] = ((color[0][2]<<8) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
//===================================================================//
memaddr++;
while(memaddr < buffersize)
{
LED_BYTE_Buffer[memaddr] = 0;
memaddr++;
}
DMA_SetCurrDataCounter(DMA1_Channel2, buffersize); // 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
}
[/mw_shl_code]
以上为WS2812驱动部分
[mw_shl_code=c,true]#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "ws2812b.h"
/************************************************
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************************************************/
uint8_t r[][3] = {255,0,0};
uint8_t g[][3] = {0,255,0};
uint8_t b[][3] = {0,0,255};
uint8_t w[][3]={0,0,0};
int main(void)
{
int xx=0,yy=0,zz=0;
delay_init(); //Ñóê±oˉêy3õê¼»ˉ
LED_Init(); //3õê¼»ˉóëLEDᬽóμÄó2¼t½ó¿ú
Timer2_init();
while(1)
{
for(xx=0;xx<255;xx++)
{
r[0][0]=xx;
for(yy=0;yy<255;yy++)
{
r[0][1]=yy;
for(zz=0;zz<255;zz++)
{
r[0][2]=zz;
delay_ms(50);
WS2812_send(r,8);
}
}
}
//while(1);
// WS2812_send(g,8);
// delay_ms(1000);
// WS2812_send(b,8);
// delay_ms(1000);
}
}
[/mw_shl_code]
以上为主程序
信号引脚为PA0
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发表于 2018-9-19 12:56:32
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