NUCLEO-F103RB 与
STM32F103RB
我想在突发模式下使用 DMA 将数据从 RAM 中的缓冲区写入
tiM1_CCR1,2,3,4?处于 PWM 模式。在 TIM1 更新 (UEV) 上请求 DMA 突发事务。突发模式下的事务数设置为 4 个事务。根据有关每个 DMA 突发请求的参考手册,RAM 缓冲区中的 4 个值必须同时传输到 CCR1、2、3、4。我实际看到的是,在每个 TIM1 更新事件中,只有一个 TIM1_CCRx 寄存器正在使用缓冲区中的新值进行更新。
这就是工作的方式吗?如果不是,哪里会出问题?
IDE:arm Keil microVision5
驱动程序:STMicroelectronics SPL
源代码
#define TIM1_DMAR_ADDRESS ((uint32_t)0x40012C4C)
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t SRC_Buffer[] = {0xFFFF, 0x7FFF, 0x3FFF, 0x1FFF};
int 主要(无效)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1,启用);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
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 = 4;
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
//TIM1(PWM 发生器)
TIM_DeInit(TIM1);
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_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0x0000;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_4Transfers);
TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
TIM_Cmd(TIM1,启用);
TIM_CtrlPWMOutputs(TIM1,启用);
DMA_Cmd(DMA1_Channel5, 启用);
同时(1){}
}
这是我在 Keil 的逻辑分析器中得到的图片
我现在正在使用模拟器,很长一段时间内将无法在真正的 MCU 上测试程序。