[Solved]Writing external SRAM cause Hardfault - 32L496GDiscovery

[Lsy.1]

By learning from example STM32Cube_FW_L4_V1.15.1\Projects\32L496GDISCOVERY\Examples\FMC\FMC_SRAM, I tried to setup a simple SRAM program in STM32CubeIDE 1.7.0.

When I was asked if I want to init peripheral or not , I select YES. Then I changed Clock and FMC settings according to the example.

My current setup looks like this:

Writing the SRAM (just before the while(1) loop in main()):

#define SRAM_BANK_ADDR         ((uint32_t)0x64000000)
*(__IO uint16_t *)(SRAM_BANK_ADDR) = (uint16_t)0x0A0B;
while(1) {}

Config System Clock:

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = 0;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 40;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV4;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART2
                              |RCC_PERIPHCLK_LPUART1|RCC_PERIPHCLK_SAI1
                              |RCC_PERIPHCLK_I2C1|RCC_PERIPHCLK_I2C2
                              |RCC_PERIPHCLK_DFSDM1|RCC_PERIPHCLK_USB
                              |RCC_PERIPHCLK_SDMMC1|RCC_PERIPHCLK_ADC;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
  PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
  PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PCLK1;
  PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
  PeriphClkInit.I2c2ClockSelection = RCC_I2C2CLKSOURCE_PCLK1;
  PeriphClkInit.Sai1ClockSelection = RCC_SAI1CLKSOURCE_PLLSAI1;
  PeriphClkInit.AdcClockSelection = RCC_ADCCLKSOURCE_PLLSAI1;
  PeriphClkInit.Dfsdm1ClockSelection = RCC_DFSDM1CLKSOURCE_PCLK;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
  PeriphClkInit.Sdmmc1ClockSelection = RCC_SDMMC1CLKSOURCE_HSI48;
  PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_MSI;
  PeriphClkInit.PLLSAI1.PLLSAI1M = 1;
  PeriphClkInit.PLLSAI1.PLLSAI1N = 20;
  PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV2;
  PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
  PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
  PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_SAI1CLK|RCC_PLLSAI1_ADC1CLK;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the main internal regulator output voltage
  */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    Error_Handler();
  }
}

Config FMC:

static 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_BANK2;
  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_DISABLE;
  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_ENABLE;
  hsram1.Init.PageSize = FMC_PAGE_SIZE_NONE;
  /* Timing */
  Timing.AddressSetupTime = 5;
  Timing.AddressHoldTime = 1;
  Timing.DataSetupTime = 3;
  Timing.BusTurnAroundDuration = 1;
  Timing.CLKDivision = 2;
  Timing.DataLatency = 2;
  Timing.AccessMode = FMC_ACCESS_MODE_A;
  /* ExtTiming */
 
  if (HAL_SRAM_Init(&hsram1, &Timing, NULL) != HAL_OK)
  {
    Error_Handler( );
  }
 
  /** Perform the SRAM2 memory initialization sequence
  */
  hsram2.Instance = FMC_NORSRAM_DEVICE;
  hsram2.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
  /* hsram2.Init */
  hsram2.Init.NSBank = FMC_NORSRAM_BANK1;
  hsram2.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE;
  hsram2.Init.MemoryType = FMC_MEMORY_TYPE_SRAM;
  hsram2.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_16;
  hsram2.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
  hsram2.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
  hsram2.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
  hsram2.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
  hsram2.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
  hsram2.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
  hsram2.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
  hsram2.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
  hsram2.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
  hsram2.Init.WriteFifo = FMC_WRITE_FIFO_ENABLE;
  hsram2.Init.PageSize = FMC_PAGE_SIZE_NONE;
  /* Timing */
  Timing.AddressSetupTime = 15;
  Timing.AddressHoldTime = 15;
  Timing.DataSetupTime = 255;
  Timing.BusTurnAroundDuration = 15;
  Timing.CLKDivision = 16;
  Timing.DataLatency = 17;
  Timing.AccessMode = FMC_ACCESS_MODE_A;
  /* ExtTiming */
 
  if (HAL_SRAM_Init(&hsram2, &Timing, NULL) != HAL_OK)
  {
    Error_Handler( );
  }
 
  /* USER CODE BEGIN FMC_Init 2 */
 
  /* USER CODE END FMC_Init 2 */
}

Everything else is automatically generated by STM32CubeIDE. I have tried to change FMC_MEMORY_TYPE_SRAM to PSRAM because the schematic said it is a PSRAM but nothing changed. I have compared my code with the example but failed to find any significant difference. So I am here for some help.

[Lsy.1 · Accepted solution]

I have solved my problem by changing FMC_WRITE_OPERATION_DISABLE to FMC_WRITE_OPERATION_ENABLE.