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ISPRO下载型编程器 |
ByteBlaster II Cable |
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51单片机升级STM32 火爆销售中 |
MPLAB-ICD2 火爆销售中 |
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STM32 FSMC访问SRAM初始化代码及硬件连接关系
类别:技术文章 来源:未知 作者:未知 关键字:SRAM 加入日期:2013-1-9 STM32 FSMC访问SRAM初始化代码及硬件连接关系 MCU为STM32F103VC在使用FSMC访问外部的SRAM的时候, 在使用中为数据线和地址线复用的形式,所以外部加锁存器进行地址锁存,用NADV信号来控制锁存器的lock脚。 信号连接: NADV---->PB7 NOE----->PD4 NWE----->PD5 NE1----->PD7 NBL0---->PE0 NBL1---->PE1 我使用的为IAR5.0,使用STM32的库函数 我的初始化如下: /* DMA1 and DMA2, FSMCclock enable */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_DMA2|RCC_AHBPeriph_SRAM|RCC_AHBPeriph_FSMC, ENABLE); void FSMC_SRAM_Init(void) { FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure; FSMC_NORSRAMTimingInitTypeDef p; GPIO_InitTypeDef GPIO_InitStructure; // RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE , ENABLE); /*-- GPIO Configuration ------------------------------------------------------*/ /* Set PD.00(D2), PD.01(D3), PD.08(D13), PD.09(D14), PD.10(D15),PD.11(A16), PD.14(D0), PD.15(D1) as alternate function push pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |GPIO_Pin_11 | 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_Init(GPIOE, &GPIO_InitStructure); /* PD.04(NOE), PD.05(NWE), PD.07(NE1) configuration */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_5|GPIO_Pin_7; GPIO_Init(GPIOD, &GPIO_InitStructure); /* NBL0, NBL1 configuration */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; GPIO_Init(GPIOE, &GPIO_InitStructure); /*NADV configuration */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_Init(GPIOB, &GPIO_InitStructure); /*-- FSMC Configuration ------------------------------------------------------*/ p.FSMC_AddressSetupTime = 2; p.FSMC_AddressHoldTime = 2; p.FSMC_DataSetupTime = 3; p.FSMC_BusTurnAroundDuration = 2; p.FSMC_CLKDivision = 2; p.FSMC_DataLatency = 3; p.FSMC_AccessMode = FSMC_AccessMode_B; FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1; FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Enable; FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR; FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b; FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_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_AsyncWait = FSMC_AsyncWait_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_SRAM Bank */ FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE); } 然后我调用FSMC_SRAM_WriteBuffer(),进行写操作。在FSMC章节中,对复用形式下,采用了模式B。 您可能还会关注的相关技术资料: |
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