最近在做一个项目，需要用stm32从一个双口RAM CY7C027V-25AI里取数据，然后再显示到液晶上。思路是想用DMA配合FSMC去读那个双口RAM。但是发现一个问题。在连上JTAG之后，点debug，点全速运行，有时候可以顺利地跑整个程序。但有时候却会卡在while(!DMA_GetFlagStatus(DMA1_FLAG_TC3)); 运行不下去。如果拔掉JTAG，重新上电，每次程序都会卡住。在重新手动复位之后，又正常了，程序可以顺利跑下去。
关于FSMC和DMA设置的代码如下：
[mw_shl_code=c,true]void FSMC_SRAM_Configuration(void)
{
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
FSMC_NORSRAMTimingInitTypeDef SRAM_TIMING;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOG | RCC_APB2Periph_GPIOE |
RCC_APB2Periph_GPIOF|RCC_APB2Periph_AFIO, ENABLE);
/*-- GPIO Configuration ------------------------------------------------------*/
/* SRAM Data lines configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 |GPIO_Pin_3|GPIO_Pin_6|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_Init(GPIOE, &GPIO_InitStructure);
/* SRAM 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_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_Init(GPIOG, &GPIO_InitStructure);
/* NOE and NWE configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_5;
GPIO_Init(GPIOD, &GPIO_InitStructure);
/* NE1 configuration */
GPIO_InitStructure.GPIO_Pin = 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);
/*-- FSMC Configuration ------------------------------------------------------*/
SRAM_TIMING.FSMC_AddressSetupTime = 0;
SRAM_TIMING.FSMC_AddressHoldTime = 0;
SRAM_TIMING.FSMC_DataSetupTime = 2;
SRAM_TIMING.FSMC_BusTurnAroundDuration = 0;
SRAM_TIMING.FSMC_CLKDivision = 0;
SRAM_TIMING.FSMC_DataLatency = 0;
SRAM_TIMING.FSMC_AccessMode = FSMC_AccessMode_A;
FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
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_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 = &SRAM_TIMING;
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &SRAM_TIMING;
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
/* Enable FSMC Bank1_SRAM Bank */
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}[/mw_shl_code]
[mw_shl_code=c,true]void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
DMA_DeInit(DMA1_Channel3);
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(Bank1_SRAM1_ADDR+0x10);
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)LcdData;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = DISPLAY_NUMBER*CHANNEL_NUMBER;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Enable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
}[/mw_shl_code]
在取数据时，自己写的函数如下：
[mw_shl_code=c,true]void DataAcquisition(void)
{
DMA_Configuration();
DMA_Cmd(DMA1_Channel3, ENABLE);
while(!DMA_GetFlagStatus(DMA1_FLAG_TC3));
DMA_ClearFlag(DMA1_FLAG_TC3);
}[/mw_shl_code]
程序就是卡在DataAcquisition()函数里的 while(!DMA_GetFlagStatus(DMA1_FLAG_TC3));这句话上。
请大家帮忙看看问题出在哪里？已经卡了好几天了，搞了半天也没搞明白怎么回事。。。谢谢大家！
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发表于 2014-6-2 09:15:42
发表于 2014-6-2 11:07:08
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