ارسال و دریافت با i2c
سلام
من یه هدر دارم که توسط تابع زیر ارسال و دریافت میکنه و توضیحات تابع هم در زیر هست :
کد:/************************************************************************ * Function Name: LDByteWriteI2C * * Parameters: EE memory ControlByte, address and data * * Description: Writes data one byte at a time to I2C EE * * device. This routine can be used for any I2C * * EE memory device, which only uses 1 byte of * * address data as in the 24LC01B/02B/04B/08B/16B. * * * ************************************************************************/ unsigned char LDByteWriteI2C( unsigned char ControlByte, unsigned char LowAdd, unsigned char data ) { IdleI2C(); // ensure module is idle StartI2C(); // initiate START condition while ( SSPCON2bits.SEN ); // wait until start condition is over WriteI2C( ControlByte ); // write 1 byte - R/W bit should be 0 IdleI2C(); // ensure module is idle WriteI2C( LowAdd ); // write address byte to EEPROM IdleI2C(); // ensure module is idle WriteI2C ( data ); // Write data byte to EEPROM IdleI2C(); // ensure module is idle StopI2C(); // send STOP condition while ( SSPCON2bits.PEN ); // wait until stop condition is over while (EEAckPolling(ControlByte)); //Wait for write cycle to complete return ( 0 ); // return with no error } /******************************************************************** * Function Name: LDByteReadI2C * * Parameters: EE memory ControlByte, address, pointer and * * length bytes. * * Description: Reads data string from I2C EE memory * * device. This routine can be used for any I2C* * EE memory device, which only uses 1 byte of * * address data as in the 24LC01B/02B/04B/08B. * * * ********************************************************************/ unsigned char LDByteReadI2C( unsigned char ControlByte, unsigned char address, unsigned char *data, unsigned char length ) { IdleI2C(); // ensure module is idle StartI2C(); // initiate START condition while ( SSPCON2bits.SEN ); // wait until start condition is over WriteI2C( ControlByte ); // write 1 byte IdleI2C(); // ensure module is idle WriteI2C( address ); // WRITE word address to EEPROM IdleI2C(); // ensure module is idle RestartI2C(); // generate I2C bus restart condition while ( SSPCON2bits.RSEN ); // wait until re-start condition is over WriteI2C( ControlByte | 0x01 ); // WRITE 1 byte - R/W bit should be 1 for read IdleI2C(); // ensure module is idle getsI2C( data, length ); // read in multiple bytes NotAckI2C(); // send not ACK condition while ( SSPCON2bits.ACKEN ); // wait until ACK sequence is over StopI2C(); // send STOP condition while ( SSPCON2bits.PEN ); // wait until stop condition is over return ( 0 ); // return with no error }
میخام ارسال و دریافتی که توسط تابع بالا انجام میشه رو توسط تابع زیر انجام بدم :
باید توی تابع LDByteWriteI2C پارامتر مثلا LowAdd رو با چه پارامتری در تابع I2C_WriteNByte تعویض کنم ؟ بقیه پارامتر ها چطور ؟کد:/* ********************************************************************************************************* ** Function name: I2C_WriteNByte () ** Function: to have the child write N bytes of data the device address ** Entry parameter: sla device from the address ** Suba_type subaddress structure 1 - single-byte address 3-8 + X structure 2-- byte address ** Suba internal device physical address ** * S will be a pointer to data to be written ** Num the number of data to be written ** Output Parameters: 1 operation is successful ** 0 operation failed ********************************************************************************************************* */ uint8_t I2C_WriteNByte(uint8_t sla, uint8_t suba_type, uint32_t suba, uint8_t *s, uint32_t num) { if (num > 0) /* If you read the number is 0, return error */ { if (suba_type == 1) { I2C_sla = sla; /* Read from the device address */ I2C_suba = suba; /* Device subaddress */ I2C_suba_num = 1; /* 1 byte device subaddress */ } if (suba_type == 2) { I2C_sla = sla; /* Read from the device address */ I2C_suba = suba; /* Device subaddress */ I2C_suba_num = 2; /* 1 byte device subaddress */ } if (suba_type == 3) { I2C_sla = sla + ((suba >> 7 )& 0x0e); /* Read from the device address */ I2C_suba = suba; /* Device subaddress */ I2C_suba_num = 1; /* 1 byte device subaddress */ } I2C_buf = s; /* Data */ I2C_num = num; /* The number of data */ I2C_suba_en = 2; /* A sub-address, write */ I2C_end = 0; LPC_I2C0->I2CONCLR = (1 << 2)| (1 << 3)| (1 << 5); /* Clear SI flag */ LPC_I2C0->I2CONSET = (1 << 5)| (1 << 6); /* Set Start flag */ while(I2C_end == 0); if(I2C_end) { Delay(20); return 1; } else { Delay(20); return 0; } } Delay(20); return 0; } /* ********************************************************************************************************* ** Function name: I2C_ReadNByte () ** Function: sub-address from a device to read N bytes starting at any address data ** Entry parameter: sla device from the address ** Suba_type subaddress structure 1 - single-byte address 2-8 + X structure 2-- byte address ** Suba device subaddress ** S data receive buffer pointer ** Num the number of read ** Output Parameters: 1 operation is successful ** 0 operation failed ********************************************************************************************************* */ uint8_t I2C_ReadNByte (uint8_t sla, uint8_t suba_type, uint32_t suba, uint8_t *s, uint32_t num) { if (num > 0) { if (suba_type == 1) { I2C_sla = sla + 1; /* Read from the device address~{#,~}R=1 */ I2C_suba = suba; /* Device subaddress */ I2C_suba_num = 1; /*1 byte device subaddress */ } if (suba_type == 2) { I2C_sla = sla + 1; /* Read from the device address~{#,~}R=1 */ I2C_suba = suba; /* Device subaddress */ I2C_suba_num = 2; /* 1 byte device subaddress */ } if (suba_type == 3) { I2C_sla = sla + ((suba >> 7 )& 0x0e) + 1; /* Read from the device address~{#,~}R=1 */ I2C_suba = suba & 0x0ff; /* Device subaddress */ I2C_suba_num = 1; /* 1 byte device subaddress */ } I2C_buf = s; /* Data receive buffer pointer */ I2C_num = num; /* To read the number of */ I2C_suba_en = 1; /* A sub-address read */ I2C_end = 0; LPC_I2C0->I2CONCLR = (1 << 2)| (1 << 3)| (1 << 5); /* Clear SI flag */ LPC_I2C0->I2CONSET = (1 << 5)| (1 << 6); /* Set Start flag */ while(I2C_end == 0); if(I2C_end) { Delay(20); return 1; } else { Delay(20); return 0; } } Delay(20); return 0; }
کد:LDByteWriteI2C( unsigned char ControlByte, unsigned char LowAdd, unsigned char data ))کد:I2C_WriteNByte(uint8_t sla, uint8_t suba_type, uint32_t suba, uint8_t *s, uint32_t num
پاسخ با نقل قول
نوشته اصلی توسط arvin2009
