AN1045 Просмотр технического описания (PDF) - STMicroelectronics

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AN1045

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

STMicroelectronics 

ST7 S/W IMPLEMENTATION OF I2C BUS MASTER

if (flag==1) return;

/* If master receiver, go back to I2Cm_Rx() to receive data */

}

}

/*--------------------------------------------------------------------------

ROUTINE NAME : I2Cm_Rx

INPUT/OUTPUT : @ reception buffer + n-2 data/ None.

DESCRIPTION : Receive in data buffer via I2C.

COMMENTS : Most significant bytes first.

--------------------------------------------------------------------------*/

void I2Cm_Rx (char *buffin,char nb)

{

SetBit(I2C_SR1,RCPT);

/* Master in receiver mode

*/

I2Cm_Tx(send_tab,nb);

/* Send the addresses and wait ACK */

if (ValBit(I2C_SR2,AF)) return;

/* If AF -> go back to main and restart the reception */

for (j=nb-2;j!=0xFF;j--)

{

count=1;

buff=0;

ClrBit(PADDR,SDA);

/* SDA as floating input to read data from the EEPROM */

do

{

I2Cm_RxData();

/* Read data bit per bit, MSB first */

count*=2;

}while(count!=0);

I2C_DR=buff;

SetBit(PADDR,SDA);

/* Configure SDA as output

*/

if (j==0)

I2C_nAck();

/* Non acknowledge to make the master generate the STOP */

else

I2C_Ack();

/* To acknowledge read data

*/

buffin[j]=I2C_DR;

}

}

/* Store read data into buffin */

/******************* (c) 2003 STMicroelectronics ************ END OF FILE ***/

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