stm32f013 dma pwm ws2812源程序 -

#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 TIM2_CCR1_Address 0x40000034 // physical memory address of Timer 2 CCR1 register
//#define TIM3_CCR1_Address 0x40000434 // physical memory address of Timer 3 CCR1 register
#define TIM2_CCR1_Address 0x40000034
#define TIM2_CCR2_Address 0x40000038
#define TIM2_CCR3_Address 0x4000003C
#define TIM2_CCR4_Address 0x40000040
#define TIMING_ONE 50
#define TIMING_ZERO 25
uint16_t LED1_BYTE_Buffer[5000];
uint16_t LED2_BYTE_Buffer[5000];
uint16_t LED3_BYTE_Buffer[5000];
uint16_t LED4_BYTE_Buffer[5000];
//uint16_t LED5_BYTE_Buffer[300];
//uint16_t LED6_BYTE_Buffer[300];
//uint16_t LED7_BYTE_Buffer[300];
//uint16_t LED8_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_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
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);
/* PWM2 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_OC2Init(TIM2, &TIM_OCInitStructure);
/* PWM3 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_OC3Init(TIM2, &TIM_OCInitStructure);
/* PWM4 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_OC4Init(TIM2, &TIM_OCInitStructure);
*/
/* configure DMA */
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* DMA1 Channel2 Config for PWM1 by TIM2_CH1*/
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)LED1_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);
/* DMA1 Channel7 Config for PWM2 by TIM2_CH2*/
DMA_DeInit(DMA1_Channel7);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR2_Address; // physical address of Timer 3 CCR1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED2_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_Channel7, &DMA_InitStructure);
/* DMA1 Channel1 Config for PWM3 by TIM2_CH3*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR3_Address; // physical address of Timer 3 CCR1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED3_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_Channel1, &DMA_InitStructure);
/* DMA1 Channel7 Config for PWM4 by TIM2_CH4*/
/* DMA_DeInit(DMA1_Channel7);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM2_CCR4_Address; // physical address of Timer 3 CCR1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)LED4_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_Channel7, &DMA_InitStructure);
*/
/* TIM2 DMA Request enable */
TIM_DMACmd(TIM2, TIM_DMA_CC1, ENABLE);
TIM_DMACmd(TIM2, TIM_DMA_CC2, ENABLE);
TIM_DMACmd(TIM2, TIM_DMA_CC3, ENABLE);
// TIM_DMACmd(TIM2, TIM_DMA_CC4, 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_led1_send(uint8_t (*color)[3], uint16_t len)
{
uint8_t i;
uint16_t memaddr;
uint16_t buffersize;
buffersize = (len*24)+43; // number of bytes needed is #LEDs * 24 bytes + 42 trailing bytes
memaddr = 0; // reset buffer memory index
while (len)
{
for(i=0; i<8; i++) // GREEN data
{
LED1_BYTE_Buffer[memaddr] = ((color[0][1]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // RED
{
LED1_BYTE_Buffer[memaddr] = ((color[0][0]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // BLUE
{
LED1_BYTE_Buffer[memaddr] = ((color[0][2]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
len--;
}
//===================================================================//
//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
LED1_BYTE_Buffer[memaddr] = ((color[0][2]<<8) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
//===================================================================//
memaddr++;
while(memaddr < buffersize)
{
LED1_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 2
TIM_Cmd(TIM2, ENABLE); // enable Timer 2
while(!DMA_GetFlagStatus(DMA1_FLAG_TC2)) ; // wait until transfer complete
TIM_Cmd(TIM2, DISABLE); // disable Timer 2
DMA_Cmd(DMA1_Channel2, DISABLE); // disable DMA channel 2
DMA_ClearFlag(DMA1_FLAG_TC2); // clear DMA1 Channel 2 transfer complete flag
}
/* 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_led2_send(uint8_t (*color)[3], uint16_t len)
{
uint8_t i;
uint16_t memaddr;
uint16_t buffersize;
buffersize = (len*24)+43; // number of bytes needed is #LEDs * 24 bytes + 42 trailing bytes
memaddr = 0; // reset buffer memory index
while (len)
{
for(i=0; i<8; i++) // GREEN data
{
LED2_BYTE_Buffer[memaddr] = ((color[0][1]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // RED
{
LED2_BYTE_Buffer[memaddr] = ((color[0][0]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
for(i=0; i<8; i++) // BLUE
{
LED2_BYTE_Buffer[memaddr] = ((color[0][2]<<i) & 0x0080) ? TIMING_ONE:TIMING_ZERO;
memaddr++;
}
len--;
}
//===================================================================//
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