STM32H7的FMC做纯软件IO输出控制可以输出40MHz方波

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楼主 | 2018-8-10 07:46 | 只看该作者回帖奖励

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IO, 输出控制, STM32H7, 软件, 方波

FMC时序配置为最高性能：
SRAM_Timing.AddressSetupTime    = 0;
      SRAM_Timing.AddressHoldTime       = 1;
      SRAM_Timing.DataSetupTime       = 1;
      SRAM_Timing.BusTurnAroundDuration  = 0;
      SRAM_Timing.CLKDivision          = 2;
      SRAM_Timing.DataLatency          = 0;
      SRAM_Timing.AccessMode          = FMC_ACCESS_MODE_A;

      hsram.Init.NSBank          = FMC_NORSRAM_BANK1;
      hsram.Init.DataAddressMux    = FMC_DATA_ADDRESS_MUX_DISABLE;
      hsram.Init.MemoryType       = FMC_MEMORY_TYPE_SRAM;
      hsram.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_32;
      hsram.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
      hsram.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
      hsram.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
      hsram.Init.WriteOperation    = FMC_WRITE_OPERATION_ENABLE;
      hsram.Init.WaitSignal       = FMC_WAIT_SIGNAL_DISABLE;
      hsram.Init.ExtendedMode    = FMC_EXTENDED_MODE_DISABLE;
      hsram.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
      hsram.Init.WriteBurst       = FMC_WRITE_BURST_DISABLE;
      hsram.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;

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