so 2048/8 = 256 bytes (which is the size of one dma buffer) Does this mean that DAC is getting data faster than I can write to the dma tx buffer. That seems the only explaination for not over running the buffer Code:Select all ...
it can happen that the tx_buffer data will be still in write-buffer inside the CPU, while the DMA is already started. Solution can be to set the tx_buffer as device type and force CPU to order the memory operations, or add __DSB() instruction before starting the DMA. ...
The fact that the size of dma-buf is invariant over the lifetime of the buffer is mentioned in the comment of 'dma_buf_ops.mmap', but is not documented at where the info is defined. Add the missing documentation. Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com> Signed-off-by...
HAL_StatusTypeDefHAL_SRAM_Write_DMA(SRAM_HandleTypeDef *hsram,uint32_t*pAddress,uint8_t*pSrcBuffer,uint32_tBufferSize) /*从SRAM中读32位缓存数据*/ HAL_StatusTypeDefHAL_SRAM_Read_DMA(SRAM_HandleTypeDef *hsram,uint32_t*pAddress,uint8_t*pDstBuffer,uint32_tBufferSize) 5、烧录验证 烧录程序,开发...
h" #include "xaxidma.h" #include "xparameters.h" #ifndefDDR_BASE_ADDR # CHECK FOR THE VALIDDDR ADDRESS IN XPARAMETERSH, \ DEFAULTSET TO 0x01000000 define MEM_BASE_ADDR 0x10000000 #else #define _BASE_ADDR (DDR_BASE_ADDR + 0x01000000) #endif #define TXBUFFER_BASE (MEM_...
memcpy(xfer.data, (void *)pTemp, BUFFER_SIZE); #endif 实际上也不影响真实的SAI MIC到播放数据,只是你发现一旦你对数据处理了,然后听到的声音就不对了,是吗? 你添加相关数据处理代码,也是为了麦的数据处理,但是不希望影响到同步传输播放这层,是这个道理吧? 如果是这个情况,通常是...
memcpy(xfer.data, (void *)pTemp, BUFFER_SIZE); #endif 实际上也不影响真实的SAI MIC到播放数据,只是你发现一旦你对数据处理了,然后听到的声音就不对了,是吗? 你添加相关数据处理代码,也是为了麦的数据处理,但是不希望影响到同步传输播放这层,是这个道理吧? 如果是这个情况,通常是会用...
5 DMA_InitStructure.DMA_BufferSize = 12; //指定DMA通道的DMA缓存的大小 6 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; 7 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; 8 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据宽度 ...
We need al least 64MBytes dma coherent memory for both READing buffer and Writing buffer, to send and receive our data to/from FPGA, .Is there any way we can allocate bigger dma coherent memory for FPGA AVMM-DMA engine to read / write to ? I think these pre-...
(4) sys.mem.zone: memory management configuration zone_dma/zone_dma32/zone_normal/zone_highmem: set OS zone size(MB) (5) sys.enable_shared_memory: true, enable shared memory simulation ( default is true ) Enable Simpoints (1) configuration key startFastForwarded=true simPoints=directory of...