STM32F407使用系统库函数DMA |
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STM32F407使用系统库函数DMA
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程序使用DMA传输，需要使用DMA传输完成中断，程序如下： void DMA2_Stream7_IRQHandler(void) { static u16 cnt = 0 ; if(DMA_GetITStatus(DMA2_Stream7,DMA_FLAG_TCIF7)==SET) //检查DMA传输完成中断 { DMA_ClearITPendingBit(DMA2_Stream7,DMA_FLAG_TCIF7); //Clear the IT flag } } ITStatus DMA_GetITStatus(DMA_Stream_TypeDef* DMAy_Streamx, uint32_t DMA_IT) { ITStatus bitstatus = RESET; DMA_TypeDef* DMAy; uint32_t tmpreg = 0, enablestatus = 0; /* Check the parameters */ assert_param(IS_DMA_ALL_PERIPH(DMAy_Streamx)); assert_param(IS_DMA_GET_IT(DMA_IT)); /* Determine the DMA to which belongs the stream */ if (DMAy_Streamx > 11) & TRANSFER_IT_ENABLE_MASK); /* Check the enable bit in CR register */ enablestatus = (uint32_t)(DMAy_Streamx->CR & tmpreg); }else { /* Check the enable bit in FCR register */ enablestatus = (uint32_t)(DMAy_Streamx->FCR & DMA_IT_FE); } /* Check if the interrupt pending flag is in LISR or HISR */ if ((DMA_IT & HIGH_ISR_MASK) != (uint32_t)RESET) { /* Get DMAy HISR register value */ tmpreg = DMAy->HISR ; } else { /* Get DMAy LISR register value */ tmpreg = DMAy->LISR ; } /* mask all reserved bits */ tmpreg &= (uint32_t)RESERVED_MASK; /* Check the status of the specified DMA interrupt */ if (((tmpreg & DMA_IT) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET)) { /* DMA_IT is set */ bitstatus = SET; } else { /* DMA_IT is reset */ bitstatus = RESET; } /* Return the DMA_IT status */ return bitstatus; }```发现DMA传输完成后，if内程序无法进入处理。逐步调试发现其函数 DMA_GetITStatus(DMA_Stream_TypeDef* DMAy_Streamx, uint32_t DMA_IT)中传递的参数DMA_FLAG_TCIF7存在问题，现将问题记录如下： 函数内其中DMA_IT传递的是DMA_IT_TCIF7，如下 DMA_IT: specifies the DMA interrupt source to check. * This parameter can be one of the following values: * @arg DMA_IT_TCIFx: Streamx transfer complete interrupt * @arg DMA_IT_HTIFx: Streamx half transfer complete interrupt * @arg DMA_IT_TEIFx: Streamx transfer error interrupt * @arg DMA_IT_DMEIFx: Streamx direct mode error interrupt * @arg DMA_IT_FEIFx: Streamx FIFO error interrupt其在stm32F4XX.h文件中的定义如下： #define DMA_FLAG_FEIF0 ((uint32_t)0x10800001) #define DMA_FLAG_DMEIF0 ((uint32_t)0x10800004) #define DMA_FLAG_TEIF0 ((uint32_t)0x10000008) #define DMA_FLAG_HTIF0 ((uint32_t)0x10000010) #define DMA_FLAG_TCIF0 ((uint32_t)0x10000020) #define DMA_FLAG_FEIF1 ((uint32_t)0x10000040) #define DMA_FLAG_DMEIF1 ((uint32_t)0x10000100) #define DMA_FLAG_TEIF1 ((uint32_t)0x10000200) #define DMA_FLAG_HTIF1 ((uint32_t)0x10000400) #define DMA_FLAG_TCIF1 ((uint32_t)0x10000800) #define DMA_FLAG_FEIF2 ((uint32_t)0x10010000) #define DMA_FLAG_DMEIF2 ((uint32_t)0x10040000) #define DMA_FLAG_TEIF2 ((uint32_t)0x10080000) #define DMA_FLAG_HTIF2 ((uint32_t)0x10100000) #define DMA_FLAG_TCIF2 ((uint32_t)0x10200000) #define DMA_FLAG_FEIF3 ((uint32_t)0x10400000) #define DMA_FLAG_DMEIF3 ((uint32_t)0x11000000) #define DMA_FLAG_TEIF3 ((uint32_t)0x12000000) #define DMA_FLAG_HTIF3 ((uint32_t)0x14000000) #define DMA_FLAG_TCIF3 ((uint32_t)0x18000000) #define DMA_FLAG_FEIF4 ((uint32_t)0x20000001) #define DMA_FLAG_DMEIF4 ((uint32_t)0x20000004) #define DMA_FLAG_TEIF4 ((uint32_t)0x20000008) #define DMA_FLAG_HTIF4 ((uint32_t)0x20000010) #define DMA_FLAG_TCIF4 ((uint32_t)0x20000020) #define DMA_FLAG_FEIF5 ((uint32_t)0x20000040) #define DMA_FLAG_DMEIF5 ((uint32_t)0x20000100) #define DMA_FLAG_TEIF5 ((uint32_t)0x20000200) #define DMA_FLAG_HTIF5 ((uint32_t)0x20000400) #define DMA_FLAG_TCIF5 ((uint32_t)0x20000800) #define DMA_FLAG_FEIF6 ((uint32_t)0x20010000) #define DMA_FLAG_DMEIF6 ((uint32_t)0x20040000) #define DMA_FLAG_TEIF6 ((uint32_t)0x20080000) #define DMA_FLAG_HTIF6 ((uint32_t)0x20100000) #define DMA_FLAG_TCIF6 ((uint32_t)0x20200000) #define DMA_FLAG_FEIF7 ((uint32_t)0x20400000) #define DMA_FLAG_DMEIF7 ((uint32_t)0x21000000) #define DMA_FLAG_TEIF7 ((uint32_t)0x22000000) #define DMA_FLAG_HTIF7 ((uint32_t)0x24000000) #define DMA_FLAG_TCIF7 ((uint32_t)0x28000000)其中：/* Get the interrupt enable position mask in CR register */ tmpreg = (uint32_t)((DMA_IT >> 11) & TRANSFER_IT_ENABLE_MASK); 中TRANSFER_IT_ENABLE_MASK为0x001E，主要要获得当前中断是否被设置（参加数据手册），设置在CR寄存器的低4位。 则中断可以正常处理了。 |
，好决定在语句if (((tmpreg & DMA_IT) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))是否返回。以为的目的就是是的中断标识的置位段处于低四位。我使用的是DMA2_Stream7,从头文件定义可以看出DMA_FLAG_TCIF7>>11后，根本不会得到想要的结果，其他DMA中断也会一样。 由于不想修改系统库文件，所以采用寄存器操作【本文地址】
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