F103RCT6定时器TIM5-CH1 DMA无法传输

星羽 · 发表于 2019-3-23 23:45:11

求助！在用 stm32调试WS2812的时候，网上找的代码，用PA0口的TIM2-CH1，DMA方式输出PWM进行驱动，验证过可以成功。配置代码如下：
[mw_shl_code=c,true]void Timer2_init(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_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);DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* TIM3 CC1 DMA Request enable */
TIM_DMACmd(TIM2, TIM_DMA_Update, ENABLE);
}
[/mw_shl_code]在主函数中调用的子程序如下：
[mw_shl_code=c,true]void WS2812_send(uint8_t (*color)[3], uint16_t len)
{

// 省略了逻辑处理的代码，主要是往数组中填充数据，和DMA无关

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
}[/mw_shl_code]

在DMA的传输完成中断中，关闭DMA和定时器，中断服务函数如下：
[mw_shl_code=c,true]void DMA1_Channel2_IRQHandler()
{
if(DMA_GetITStatus(DMA1_FLAG_TC2))
{
      DMA_ClearFlag(DMA1_FLAG_GL2);
      TIM_Cmd(TIM2, DISABLE); // disable Timer 2
      DMA_Cmd(DMA1_Channel2, DISABLE);
}
}[/mw_shl_code]
以上代码经过测试，可以正常工作。
但是程序中还要用到USART3_TX的DMA，同样也是DMA1_Channel2,和上面的冲突了。

于是考虑到，用PA0引脚的TIM5-CH1产生PWM，这时候用到的是DMA2_Channel5.
于是将代码改成下面的样子：

配置代码如下：
[mw_shl_code=c,true]void LED_PWM_Init(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_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_TIM5, 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(TIM5, &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(TIM5, &TIM_OCInitStructure);
/* TIM3 CC1 DMA Request enable */
TIM_DMACmd(TIM5, TIM_DMA_Update, ENABLE);
/* configure DMA */
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

/* DMA1 Channel6 Config */
DMA_Cmd(DMA1_Channel2, DISABLE);
DMA_DeInit(DMA2_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM5_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(DMA2_Channel5, &DMA_InitStructure);

DMA_ITConfig(DMA2_Channel5, DMA_IT_TC, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel4_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}[/mw_shl_code]

在主函数中调用的子程序如下
[mw_shl_code=c,true]void WS2812_send(uint8_t (*color)[3], uint16_t len)
{

// 省略了逻辑处理的代码，主要是往数组中填充数据，和DMA无关

DMA_SetCurrDataCounter(DMA2_Channel5, buffersize); // load number of bytes to be transferred
DMA_Cmd(DMA2_Channel5, ENABLE); // enable DMA channel 6
TIM_Cmd(TIM5, ENABLE); // enable Timer 3
}[/mw_shl_code]

在DMA的传输完成中断中，关闭DMA和定时器，中断服务函数如下：
[mw_shl_code=c,true]
void DMA2_Channel4_5_IRQHandler()
{
if(DMA_GetITStatus(DMA2_FLAG_TC5))
{
      DMA_ClearFlag(DMA2_FLAG_GL5);
      TIM_Cmd(TIM5, DISABLE); // disable Timer 3
      DMA_Cmd(DMA2_Channel5, DISABLE);
}
}
[/mw_shl_code]

改完之后就不工作了！！
各位大佬帮忙看看那里出错了啊啊啊啊啊
先谢谢了