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STM32H743 通过FMC 与FPGA通讯。设计成PSRAM，地址数据复用模式，16bit宽度。连续两次读操作时间间隔最小约130ns，与地址建立时间，地址保持时间，数据保持时间无关。而连续两次写操作时间间隔最小约10ns。请问怎么缩小两次读操作的时间间隔？
另外如果用DMA，如何初始化DMA？
程序如下：
DMA_HandleTypeDef hdma;
void DMA_Config() {
// 使能DMA时钟
__HAL_RCC_DMA1_CLK_ENABLE();
// 配置DMA
hdma.Instance = DMA1_Stream0;
// hdma.Init.Channel = DMA_CHANNEL_0;
hdma.Init.Direction = DMA_MEMORY_TO_MEMORY;
hdma.Init.PeriphInc = DMA_PINC_ENABLE;
hdma.Init.MemInc = DMA_MINC_ENABLE;
hdma.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma.Init.MemDataAlignment = DMA_PDATAALIGN_HALFWORD;
hdma.Init.Mode = DMA_NORMAL;
hdma.Init.Priority = DMA_PRIORITY_HIGH;
HAL_DMA_Init(&hdma);
}
void DMA_Transfer(uint32_t srcAddr, uint32_t destAddr, uint32_t dataSize) {
// 启动DMA传输
HAL_DMA_Start(&hdma, srcAddr, destAddr, dataSize);
}
void MX_FMC_Init(void)
{
/* USER CODE BEGIN FMC_Init 0 */
/* USER CODE END FMC_Init 0 */
FMC_NORSRAM_TimingTypeDef Timing = {0};
/* USER CODE BEGIN FMC_Init 1 */
/* USER CODE END FMC_Init 1 */
/** Perform the SRAM1 memory initialization sequence
*/
hsram1.Instance = FMC_NORSRAM_DEVICE;
hsram1.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
/* hsram1.Init */
hsram1.Init.NSBank = FMC_NORSRAM_BANK1;
hsram1.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_ENABLE;
hsram1.Init.MemoryType = FMC_MEMORY_TYPE_NOR;
hsram1.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_32;
hsram1.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
hsram1.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
hsram1.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
hsram1.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
hsram1.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
hsram1.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
hsram1.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
hsram1.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
hsram1.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
hsram1.Init.WriteFifo = FMC_WRITE_FIFO_DISABLE;
hsram1.Init.PageSize = FMC_PAGE_SIZE_NONE;
/* Timing */
Timing.AddressSetupTime = 4; /* 地址建立时间 范围0 -15个FMC时钟周期个数*/
Timing.AddressHoldTime = 2; /* 地址保持时间，配置为模式A时，用不到此参数 范围1 -15个时钟周期个数 */
Timing.DataSetupTime = 44; /* 数据保持时间，范围1 -255个时钟周期个数 */
Timing.BusTurnAroundDuration = 1;
Timing.CLKDivision = 1;
Timing.DataLatency = 2;
Timing.AccessMode = FMC_ACCESS_MODE_A;
/* ExtTiming */
if (HAL_SRAM_Init(&hsram1, &Timing, NULL) != HAL_OK)
{
Error_Handler( );
}
/* USER CODE BEGIN FMC_Init 2 */
/* USER CODE END FMC_Init 2 */
} |
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发表于 2025-7-6 19:49:04
楼主
发表于 2025-7-8 08:55:53
