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本帖最后由 yexiachensi11 于 2020-10-21 17:26 编辑
主控芯片STM32F103VET6，使用标准库。
按照下面的代码配置TIM1和DMA，可以触发从内存到CCR1~4的值的更新，但是更新顺序是乱来的，请教各位大神哪里出错了？
//定时器和DMA初始化如下
void timerInit(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
DMA_InitTypeDef DMA_InitStructure;
TIM_TimeBaseInitStructure.TIM_Prescaler = 0;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;//向上向下均产生中断标志位
TIM_TimeBaseInitStructure.TIM_Period = PWM_PERIOD_VALUE;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;//不分频
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 1;//更新事件产生速率
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCNIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Disable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Disable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = TIM_BDTR_DTG_0;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
/* DMA1 channel5 configuration ---------------------------------------------*/
DMA_Cmd(DMA1_Channel5, DISABLE);//禁用DMA,禁用后才能改写DMA寄存器值
DMA_DeInit(DMA1_Channel5);//DMA1的通道5设置为缺省值
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(TIM1->DMAR));////DMA外设数据寄存器地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)dutyABC;//DMA目标地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//从内存到外设
DMA_InitStructure.DMA_BufferSize = 4;//每次传输数据4（单位halfward由下面目标和外设决定）
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//每次传输一个数据后外设数据寄存器地址不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//每次传输一个数据后内存地址加2（单位HalfWord同上）
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据宽度半字16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//内存数据宽半字16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//正常模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High;//优先级高
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//禁止内存到内存模式
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
TIM_DMAConfig(TIM1,TIM_DMABase_CCR1,TIM_DMABurstLength_4Transfers);
TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
}
//启动定时器和DMA
void svpwmStart(void)
{
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM1->CR1 |= 0x1;
DMA_Cmd(DMA1_Channel5, ENABLE);
}
//主程序
void main(void)
{
timerInit();
svpwmStart();
while(1)
{
;
}
}
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最佳答案
查看完整内容[请看2#楼]
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(TIM1->CCR1));////DMA外设数据寄存器地址
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//外设数据宽度半字32位
这两个地方修改一下就可以。
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发表于 2020-10-21 17:21:21
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