STM32 H757 FMC Controller stall after couple of reads on M7 core
Hi all,
currently iam using the stm32h757 controller.
i want to use the FMC on both cores, in SRAM mode with this config:
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_DISABLE;
hsram1.Init.MemoryType = FMC_MEMORY_TYPE_SRAM;
hsram1.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_16;
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 = 2;
Timing.AddressHoldTime = 2;
Timing.DataSetupTime = 3;
Timing.BusTurnAroundDuration = 2;
Timing.CLKDivision = 16;
Timing.DataLatency = 17;
Timing.AccessMode = FMC_ACCESS_MODE_A;
When i read the FMC address from the M4 core multiple times, i have no problem and can read data. For example like this:
tmp_data = *((__IO uint16_t *) 0x60014a72);
But when i read from the M7 core, i can read like 1-2 times, and then i won't receive any data anymore.
On the Oscilloscope i can see that the NE & NOE Pins will not be reset and stay high after the second read (for the successful reads, the NE & NOE are reset as expected).
What i did so far:
- Aligned all address to be even (as suggested in the errata sheet ES0445 - Rev 5)
- created two minimal examples where only one core M4 (respectively the M7) is initializing and using the FMC. So no interaction from the other core can interfere.
Is this a known issue/behavior, or did someone experience the same ?
Best regards