Jump to content

    
Sign in to follow this  
Igor_FPGA

STM32 + 2 FSMC (SRAM & LCD)

Recommended Posts

Добрый день.

Подключили к STM32F103ZFH 1Mx16 SRAM (CY62167EV30) по FSMC, согласно даташиту цикл чтения - 45 нс.

На другой банк подключили китайский дисплей с контроллером ST7789S, шина 8 бит.

Инициализировали одинаковым кодом (!), кроме CS конечно (ST7789S нужно бы как 8 бит,

но проблема не в нем).

 

Результат по осциллографу - период импульсов записи в дисплейный контроллер ~150-200 нс.

Запись/чтение в SRAM - в лучшем случае 350 нс.

 

Почему могут различаться скорости на шинах? Есть какие-нибудь идеи? Код инициализации обоих FSMC привел.

 

Спасибо

 

 

 
void FSMC_Init(void) {
  FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
   FSMC_NORSRAMTimingInitTypeDef  p;
   GPIO_InitTypeDef GPIO_InitStructure;

   /* Enable the FSMC Clock */
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_GPIOF | RCC_APB2Periph_GPIOG, ENABLE);


   /*-- GPIO Configuration ------------------------------------------------------*/
   /*!< NOR Data lines configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_14 | GPIO_Pin_15;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   GPIO_Init(GPIOD, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_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_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE, &GPIO_InitStructure);

   /*!< NOR Address lines configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOF, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOG, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE, &GPIO_InitStructure);

   /*!< NOE and NWE configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

   /*!< BLE and BHE configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOE, &GPIO_InitStructure);

   /*!< NE2 configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOG, &GPIO_InitStructure);


   /*-- FSMC Configuration ----------------------------------------------------*/
   p.FSMC_AddressSetupTime = 0x01;//5;
   p.FSMC_AddressHoldTime = 0x00; // don't care
   p.FSMC_DataSetupTime = 2; //5;
   p.FSMC_BusTurnAroundDuration = 0x00;
   p.FSMC_CLKDivision = 0x00; // don't care
   p.FSMC_DataLatency = 0x00; // don't care
   p.FSMC_AccessMode = FSMC_AccessMode_A;

   FSMC_NORSRAMInitStructure.FSMC_Bank 							= FSMC_Bank1_NORSRAM2;
   FSMC_NORSRAMInitStructure.FSMC_DataAddressMux 		= FSMC_DataAddressMux_Disable;
   FSMC_NORSRAMInitStructure.FSMC_MemoryType 				= FSMC_MemoryType_SRAM;
   FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth 		= FSMC_MemoryDataWidth_16b;
   FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode 		= FSMC_BurstAccessMode_Disable;
   FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait 	= FSMC_AsynchronousWait_Disable;
   FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
   FSMC_NORSRAMInitStructure.FSMC_WrapMode 					= FSMC_WrapMode_Disable;
   FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive 	= FSMC_WaitSignalActive_BeforeWaitState;
   FSMC_NORSRAMInitStructure.FSMC_WriteOperation 		= FSMC_WriteOperation_Enable;
   FSMC_NORSRAMInitStructure.FSMC_WaitSignal 				= FSMC_WaitSignal_Disable;
   FSMC_NORSRAMInitStructure.FSMC_ExtendedMode 			= FSMC_ExtendedMode_Disable;
   FSMC_NORSRAMInitStructure.FSMC_WriteBurst 				= FSMC_WriteBurst_Disable;
   FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct 	= &p;
   FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct 			= &p;

   FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);

   /*!< Enable FSMC Bank1_NOR Bank */
   FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2, ENABLE);
}

void SRAM_Init(void) {

...

   /*!< NE1 configuration */
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

...

FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;

...

FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this