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stm32i2cdma讲解学习.docx

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stm32i2cdma讲解学习.docx

stm32i2cdma讲解学习

stm32i2c

dma

#ifndef__AT24C256_H

#define__AT24C256_H

/*Includes*/

#include"stm32f10x.h"#ifdef__cplusplusextern"C"{#endif

#defineI2C_SPEED300000

#defineI2C_SLAVE_ADDRESS70xA0

#definesEE_PAGESIZE32

/*MaximumnumberoftrialsforsEE_WaitEepromStandbyState（）function*/#definesEE_MAX_TRIALS_NUMBER150/*DefintionsforthestateoftheDMAtransfer*/

#definesEE_STATE_READY0

#definesEE_STATE_BUSY1

#definesEE_STATE_ERROR2

#definesEE_OK0

#definesEE_FAIL1

（（uint32_t）0x1000）

（（uint32_t）（10*sEE_FLAG_TIMEOUT））

#definesEE_FLAG_TIMEOUT#definesEE_LONG_TIMEOUT

#definesEE_I2CI2C1

#definesEE_I2C_CLK

RCC_APB1Periph_I2C1

#definesEE_I2C_SCL_PIN

#definesEE_I2C_SCL_GPIO_PORT

GPIO_Pin_6

GPIOB

#definesEE_I2C_SCL_GPIO_CLK

RCC_APB2Periph_GPIOB

#definesEE_I2C_SDA_PIN

#definesEE_I2C_SDA_GPIO_PORT

#definesEE_I2C_SDA_GPIO_CLK

#definesEE_M24C64_32

GPIO_Pin_7

GPIOB

RCC_APB2Periph_GPIOB

#definesEE_I2C_DMADMA1

#definesEE_I2C_DMA_CHANNEL_TX

#definesEE_I2C_DMA_CHANNEL_RX

#definesEE_I2C_DMA_FLAG_TX_TC

#definesEE_I2C_DMA_FLAG_TX_GL

#definesEE_I2C_DMA_FLAG_RX_TC

DMA1_Channel6

DMA1_Channel7

DMA1_IT_TC6

DMA1_IT_GL6

DMA1_IT_TC7

#definesEE_I2C_DMA_FLAG_RX_GL

#definesEE_I2C_DMA_CLK

#definesEE_I2C_DR_Address

#definesEE_USE_DMA

#definesEE_I2C_DMA_TX_IRQn

DMA1_IT_GL7

RCC_AHBPeriph_DMA1（（uint32_t）0x40005410）

#definesEE_I2C_DMA_RX_IRQn

#definesEE_I2C_DMA_TX_IRQHandler

#definesEE_I2C_DMA_RX_IRQHandler

#definesEE_I2C_DMA_PREPRIO

#definesEE_I2C_DMA_SUBPRIO

#definesEE_DIRECTION_TX

#definesEE_DIRECTION_RX

DMA1_Channel6_IRQn

DMA1_Channel7_IRQn

DMA1_Channel6_IRQHandler

DMA1_Channel7_IRQHandler

0

/*Timeconstantforthedelaycaclulationallowingtohaveamillisecondincrementingcounter.Thisvalueshouldbeequalto（SystemClock/1000）.

ie.ifsystemclock=24MHzthensEE_TIME_CONSTshouldbe24.*/#definesEE_TIME_CONST48

voidsEE_DeInit（void）;

voidsEE_Init（void）;

uint32_tsEE_ReadBuffer（uint8_t*pBuffer,uint16_tReadAddr,uint16_t*NumByteToRead）;

uint32_tsEE_WritePage（uint8_t*pBuffer,uint16_tWriteAddr,uint8_t*NumByteToWrite）;

voidsEE_WriteBuffer（uint8_t*pBuffer,uint16_tWriteAddr,uint16_tNumByteToWrite）;

uint32_tsEE_WaitEepromStandbyState（void）;

/*USERCallbacks:

ThesearefunctionsforwhichprototypesonlyaredeclaredinEEPROMdriverandthatshouldbeimplementedintouserapplicaiton.*/

/*sEE_TIMEOUT_UserCallback（）functioniscalledwheneveratimeoutconditionoccureduringcommunication（waitingonaneventthatdoesn'toccur,buserrors,busydevices...）.

YoucanusethedefaulttimeoutcallbackimplementationbyuncommentingthedefineUSE_DEFAULT_TIMEOUT_CALLBACKinstm32_evel_i2c_ee.hfile.TypicallytheuserimplementationofthiscallbackshouldresetI2Cperipheralandre-initializecommunicationorinworstcaseresetalltheapplication.*/uint32_tsEE_TIMEOUT_UserCallback（void）;

/*StartandEndofcriticalsection:

thesecallbacksshouldbetypicallyusedtodisableinterruptswhenenteringacriticalsectionofI2CcommunicationYoumayusedefaultcallbacksprovidedintothisdriverbyuncommentingthe

defineUSE_DEFAULT_CRITICAL_CALLBACKinstm32_evel_i2c_ee.hfile..

Oryoucancommentthatlineandimplementthesecallbacksintoyourapplication*/

voidsEE_EnterCriticalSection_UserCallback（void）;voidsEE_ExitCriticalSection_UserCallback（void）;

#ifdef__cplusplus

}

#endif

以下是C文件

#include"at24c256.h"

__IOuint16_tsEEAddress=0xa0;

__IOuint32_tsEETimeout=sEE_LONG_TIMEOUT;

__IOuint16_t*sEEDataReadPointer;

__IOuint8_t*sEEDataWritePointer;

__IOuint8_tsEEDataNum;

DMA_InitTypeDefsEEDMA_InitStructure;

voidsEE_LowLevel_DeInit（void）

{

GPIO_InitTypeDefGPIO_InitStructure;NVIC_InitTypeDefNVIC_InitStructure;

/*sEE_I2CPeripheralDisable*/

I2C_Cmd（sEE_I2C,DISABLE）;

/*sEE_I2CDeInit*/

I2C_DeInit（sEE_I2C）;

/*!

SCL*/

GPIO_InitStructure.GPIO_Pin=sEE_I2C_SCL_PIN;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;

GPIO_Init（sEE_I2C_SCL_GPIO_PORT,&GPIO_InitStructure）;

/*!

SDA*/GPIO_InitStructure.GPIO_Pin=sEE_I2C_SDA_PIN;GPIO_Init（sEE_I2C_SDA_GPIO_PORT,&GPIO_InitStructure）;

/*ConfigureandenableI2CDMATXChannelinterrupt*/NVIC_InitStructure.NVIC_IRQChannel=sEE_I2C_DMA_TX_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=sEE_I2C_DMA_PREPRIO;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=sEE_I2C_DMA_SUBPRIO;NVIC_InitStructure.NVIC_IRQChannelCmd=DISABLE;

NVIC_Init（&NVIC_InitStructure）;

/*ConfigureandenableI2CDMARXChannelinterrupt*/NVIC_InitStructure.NVIC_IRQChannel=sEE_I2C_DMA_RX_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=sEE_I2C_DMA_PREPRIO;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=sEE_I2C_DMA_SUBPRIO;NVIC_Init（&NVIC_InitStructure）;

/*DisableandDeinitializetheDMAchannels*/DMA_Cmd（sEE_I2C_DMA_CHANNEL_TX,DISABLE）;DMA_Cmd（sEE_I2C_DMA_CHANNEL_RX,DISABLE）;DMA_DeInit（sEE_I2C_DMA_CHANNEL_TX）;DMA_DeInit（sEE_I2C_DMA_CHANNEL_RX）;

}

/**

*@briefInitializesperipheralsusedbytheI2CEEPROMdriver.

*@paramNone

*@retvalNone

*/

voidsEE_LowLevel_Init（void）

{GPIO_InitTypeDefGPIO_InitStructure;NVIC_InitTypeDefNVIC_InitStructure;

/*!

RCC_APB2PeriphClockCmd（sEE_I2C_SCL_GPIO_CLK|sEE_I2C_SDA_GPIO_CLK,ENABLE）;

/*!

RCC_APB1PeriphClockCmd（sEE_I2C_CLK,ENABLE）;

/*!

SCL*/GPIO_InitStructure.GPIO_Pin=sEE_I2C_SCL_PIN;GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_OD;GPIO_Init（sEE_I2C_SCL_GPIO_PORT,&GPIO_InitStructure）;

/*!

SDA*/GPIO_InitStructure.GPIO_Pin=sEE_I2C_SDA_PIN;GPIO_Init（sEE_I2C_SDA_GPIO_PORT,&GPIO_InitStructure）;

/*ConfigureandenableI2CDMATXChannelinterrupt*/NVIC_InitStructure.NVIC_IRQChannel=sEE_I2C_DMA_TX_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=sEE_I2C_DMA_PREPRIO;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=sEE_I2C_DMA_SUBPRIO;NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init（&NVIC_InitStructure）;

/*ConfigureandenableI2CDMARXChannelinterrupt*/NVIC_InitStructure.NVIC_IRQChannel=sEE_I2C_DMA_RX_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=sEE_I2C_DMA_PREPRIO;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=sEE_I2C_DMA_SUBPRIO;NVIC_Init（&NVIC_InitStructure）;

/*!

/*EnabletheDMAclock*/RCC_AHBPeriphClockCmd（sEE_I2C_DMA_CLK,ENABLE）;

/*I2CTXDMAChannelconfiguration*/DMA_DeInit（sEE_I2C_DMA_CHANNEL_TX）;sEEDMA_InitStructure.DMA_PeripheralBaseAddr=（uint32_t）sEE_I2C_DR_Address;

sEEDMA_InitStructure.DMA_MemoryBaseAddr=（uint32_t）0;/*Thisparameterwillbeconfigureddurigcommunication*/

sEEDMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;/*Thisparameterwillbeconfigureddurigcommunication*/

sEEDMA_InitStructure.DMA_BufferSize=0xFFFF;/*Thisparameterwill

beconfigureddurigcommunication*/

sEEDMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;sEEDMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;

sEEDMA_InitStructure.DMA_PeripheralDataSize=DMA_MemoryDataSize_Byte;sEEDMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Byte;sEEDMA_InitStructure.DMA_Mode=DMA_Mode_Normal;sEEDMA_InitStructure.DMA_Priority=DMA_Priority_VeryHigh;sEEDMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_Init（sEE_I2C_DMA_CHANNEL_TX,&sEEDMA_InitStructure）;

/*I2CRXDMAChannelconfiguration*/

DMA_DeInit（sEE_I2C_DMA_CHANNEL_RX）;DMA_Init（sEE_I2C_DMA_CHANNEL_RX,&sEEDMA_InitStructure）;

/*EnabletheDMAChannelsInterrupts*/

DMA_ITConfig（sEE_I2C_DMA_CHANNEL_TX,DMA_IT_TC,ENABLE）;DMA_ITConfig（sEE_I2C_DMA_CHANNEL_RX,DMA_IT_TC,ENABLE）;

}

/**

*@briefInitializesDMAchannelusedbytheI2CEEPROMdriver.

*@paramNone

*@retvalNone

*/

voidsEE_LowLevel_DMAConfig（uint32_tpBuffer,uint32_tBufferSize,uint32_tDirection）

{

/*InitializetheDMAwiththenewparameters*/

if（Direction==sEE_DIRECTION_TX）

{

/*ConfiguretheDMATxChannelwiththebufferaddressandthebuffersize*/sEEDMA_InitStructure.DMA_MemoryBaseAddr=（uint32_t）pBuffer;sEEDMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;sEEDMA_InitStructure.DMA_BufferSize=（uint32_t）BufferSize;

DMA_Init（sEE_I2C_DMA_CHANNEL_TX,&sEEDMA_InitStructure）;

}

else

{

/*ConfiguretheDMARxChannelwiththebufferaddressandthebuffersize*/sEEDMA_InitStructure.DMA_MemoryBaseAddr=（uint32_t）pBuffer;sEEDMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;sEEDMA_InitStructure.DMA_BufferSize=（uint32_t）BufferSize;

DMA_Init（sEE_I2C_DMA_CHANNEL_RX,&sEEDMA_InitStructure）;

}

voidsEE_DeInit（void）

{

sEE_LowLevel_DeInit（）;

}

/**

*@briefInitializesperipheralsusedbytheI2CEEPROMdriver.

*@paramNone

*@retvalNone

*/

voidsEE_Init（void）

{

I2C_InitTypeDefI2C_InitStructure;

sEE_LowLevel_Init（）;

/*!

/*sEE_I2Cconfiguration*/

I2C_InitStructure.I2C_Mode=I2C_Mode_I2C;I2C_InitStructure.I2C_DutyCycle=I2C_DutyCycle_2;I2C_InitStructure.I2C_OwnAddress1=I2C_SLAVE_ADDRESS7;I2C_InitStructure.I2C_Ack=I2C_Ack_Enable;

I2C_InitStructure.I2C_AcknowledgedAddress=I2C_AcknowledgedAddress_7bit;I2C_InitStructure.I2C_ClockSpeed=I2C_SPEED;

/*sEE_I2CPeripheralEnable*/

I2C_Cmd（sEE_I2C,ENABLE）;

/*ApplysEE_I2Cconfigurationafterenablingit*/

I2C_Init（sEE_I2C,&I2C_InitStructure）;

/*EnablethesEE_I2CperipheralDMArequests*/I2C_DMACmd（sEE_I2C,ENABLE）;

}

/**

*@briefReadsablockofdatafromtheEEPROM.

*@param