DMA+TIM_Burst
void DMA_TIM1_Burst(void){
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
/* TIM1 and GPIOA clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA| RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);
/* DMA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/*channel1 ,channel2--> PA.8,PA.9, PA.10*
*channel1N,channel2N --> PB.13,PB.14, PB.15*/
/* GPIOA Configuration: Channel 1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 |GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化GPIOB
/* TIM1 DeInit */
TIM_DeInit(TIM1);
/* DMA1 Channel5 Config */
DMA_DeInit(DMA1_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_DMAR_ADDRESS;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SRC_Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 6;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
/* Time base configuration */
/* -----------------------------------------------------------------------
TIM1 Configuration: generate 1 PWM signal using the DMA burst mode:
The TIM1CLK frequency is set to SystemCoreClock (Hz), to get TIM1 counter
clock at 24 MHz the Prescaler is computed as following:
- Prescaler = (TIM1CLK / TIM1 counter clock) - 1
SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
and Connectivity line devices and to 24 MHz for Low-Density Value line and
Medium-Density Value line devices
The TIM1 period is 5.8 KHz: TIM1 Frequency = TIM1 counter clock/(ARR + 1)
= 24 MHz / 4096 = 5.8KHz KHz
TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 33.33%
----------------------------------------------------------------------- */
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t) (SystemCoreClock / 24000000) - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* TIM Configuration in PWM Mode */
TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0xFFF;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
/* TIM1 DMAR Base register and DMA Burst Length Config */
TIM_DMAConfig(TIM1, TIM_DMABase_ARR, TIM_DMABurstLength_3Transfers);
/* TIM1 DMA Update enable */
TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
/*死区和刹车功能配置*/
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime =50; //设置TIM1_BDTR的DTG，死区时间DTG
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
/* TIM1 enable */
TIM_Cmd(TIM1, ENABLE);
/* TIM1 PWM Outputs Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
/* DMA1 Channel5 enable */
DMA_Cmd(DMA1_Channel5, ENABLE);
/* Wait until DMA1 Channel5 end of Transfer */
while (!DMA_GetFlagStatus(DMA1_FLAG_TC5))
{
}
/* Infinite loop */
}
这是分享呢？还是提问呢？
恕我眼拙，没看出问题来呀 :L
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