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最近遇到棘手的问题，用FMC驱动DAC时始终无信号输出，贴图贴代码如下原理图如下
SRAM_HandleTypeDef hsram2;
/* FMC initialization function */
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 SRAM2 memory initialization sequence
*/
hsram2.Instance = FMC_NORSRAM_DEVICE;
hsram2.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
/* hsram2.Init */
hsram2.Init.NSBank = FMC_NORSRAM_BANK2;
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 = 5;
Timing.AddressHoldTime = 15;
Timing.DataSetupTime = 5;
Timing.BusTurnAroundDuration = 5;
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 */
}
static uint32_t FMC_Initialized = 0;
static void HAL_FMC_MspInit(void){
/* USER CODE BEGIN FMC_MspInit 0 */
/* USER CODE END FMC_MspInit 0 */
GPIO_InitTypeDef GPIO_InitStruct = {0};
if (FMC_Initialized) {
return;
}
FMC_Initialized = 1;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/** Initializes the peripherals clock
*/
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_FMC;
PeriphClkInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_D1HCLK;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
/* Peripheral clock enable */
__HAL_RCC_FMC_CLK_ENABLE();
/** FMC GPIO Configuration
PF0 ------> FMC_A0
PE7 ------> FMC_D4
PE8 ------> FMC_D5
PE9 ------> FMC_D6
PE10 ------> FMC_D7
PE11 ------> FMC_D8
PE12 ------> FMC_D9
PE13 ------> FMC_D10
PE14 ------> FMC_D11
PE15 ------> FMC_D12
PD8 ------> FMC_D13
PD9 ------> FMC_D14
PD10 ------> FMC_D15
PD14 ------> FMC_D0
PD15 ------> FMC_D1
PD0 ------> FMC_D2
PD1 ------> FMC_D3
PD4 ------> FMC_NOE
PD5 ------> FMC_NWE
PG9 ------> FMC_NE2
*/
/* GPIO_InitStruct */
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_FMC;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
/* GPIO_InitStruct */
GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10
|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_FMC;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
/* GPIO_InitStruct */
GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_14
|GPIO_PIN_15|GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_4
|GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_FMC;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* GPIO_InitStruct */
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF12_FMC;
HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
/* USER CODE BEGIN FMC_MspInit 1 */
/* USER CODE END FMC_MspInit 1 */
}
void HAL_SRAM_MspInit(SRAM_HandleTypeDef* sramHandle){
/* USER CODE BEGIN SRAM_MspInit 0 */
/* USER CODE END SRAM_MspInit 0 */
HAL_FMC_MspInit();
/* USER CODE BEGIN SRAM_MspInit 1 */
/* USER CODE END SRAM_MspInit 1 */
}
static uint32_t FMC_DeInitialized = 0;
static void HAL_FMC_MspDeInit(void){
/* USER CODE BEGIN FMC_MspDeInit 0 */
/* USER CODE END FMC_MspDeInit 0 */
if (FMC_DeInitialized) {
return;
}
FMC_DeInitialized = 1;
/* Peripheral clock enable */
__HAL_RCC_FMC_CLK_DISABLE();
/** FMC GPIO Configuration
PF0 ------> FMC_A0
PE7 ------> FMC_D4
PE8 ------> FMC_D5
PE9 ------> FMC_D6
PE10 ------> FMC_D7
PE11 ------> FMC_D8
PE12 ------> FMC_D9
PE13 ------> FMC_D10
PE14 ------> FMC_D11
PE15 ------> FMC_D12
PD8 ------> FMC_D13
PD9 ------> FMC_D14
PD10 ------> FMC_D15
PD14 ------> FMC_D0
PD15 ------> FMC_D1
PD0 ------> FMC_D2
PD1 ------> FMC_D3
PD4 ------> FMC_NOE
PD5 ------> FMC_NWE
PG9 ------> FMC_NE2
*/
HAL_GPIO_DeInit(GPIOF, GPIO_PIN_0);
HAL_GPIO_DeInit(GPIOE, GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10
|GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14
|GPIO_PIN_15);
HAL_GPIO_DeInit(GPIOD, GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_14
|GPIO_PIN_15|GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_4
|GPIO_PIN_5);
HAL_GPIO_DeInit(GPIOG, GPIO_PIN_9);
/* USER CODE BEGIN FMC_MspDeInit 1 */
/* USER CODE END FMC_MspDeInit 1 */
}
void HAL_SRAM_MspDeInit(SRAM_HandleTypeDef* sramHandle){
/* USER CODE BEGIN SRAM_MspDeInit 0 */
/* USER CODE END SRAM_MspDeInit 0 */
HAL_FMC_MspDeInit();
/* USER CODE BEGIN SRAM_MspDeInit 1 */
/* USER CODE END SRAM_MspDeInit 1 */
}
使用的是FMC_NE2因此地址范围是0x64000000，用示波器观察到
CS/NWE波形如下
NEW出现了3次波形，不知道为何会这样
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发表于 2022-6-7 22:59:04
楼主
发表于 2022-6-8 10:26:40
