eeprom read i2c kinetis

gnsh2196 — Fri, 27 Sep 2019 06:11:20 GMT

how to read eeprom mac id from my custom board. controller is mk10dx256. eeprom is microchip /24AA025E64.adress i have to access is 0xfa. i have to read last 6 bits to get the unique mac id of the eeprom.

data sheet of eeprom

http://ww1.microchip.com/downloads/en/devicedoc/20002124g.pdf

program:

#include <__cross_studio_io.h>
#include "MK10DZ10.h"
#define MWSR 0x00 /* Master write */
#define MRSW 0x01 /* Master read */
#define reg EEPROM
void i2c_Wait(void);
i2c_Wait()
{
while((I2C1_S & I2C_S_IICIF_MASK)==0) {
}
// Clear the interrupt flag
I2C1_S |= I2C_S_IICIF_MASK;
}
main()
{
unsigned char u8Address;
unsigned char u8Register;
unsigned char u8Data = 'a';
SIM_SCGC5 |= SIM_SCGC5_PORTC_MASK;
PORTC_PCR10 |= PORT_PCR_MUX(2);
PORTC_PCR11 |= PORT_PCR_MUX(2);
//i2c1
SIM_SCGC4 |= (SIM_SCGC4_I2C1_MASK);
// START I2C
I2C1_C1 |= ( I2C_C1_TX_MASK );

I2C1_D = u8Data;
I2C1_F = 0;
I2C1_F = 0x80;

I2C1_F |= I2C_F_ICR( 0x18 ) ;

//i2c_Wait()
//{
// while((I2C1_S & I2C_S_IICIF_MASK)==0) {
// }
// // Clear the interrupt flag
// I2C1_S |= I2C_S_IICIF_MASK;
//}

//STOP I2C
//I2C1_C1 &= ~( I2C_C1_TX_MASK );
unsigned char I2C_ReadRegister_uc (unsigned char u8Address, unsigned char u8Register ){
unsigned char u8Data;
unsigned char u8AddressW, u8AddressR;
/* shift ID in right position */
u8AddressW = (u8Address << 1) | MWSR; // Write Address
u8AddressR = (u8Address << 1) | MRSW; // Read Address
/* send start signal */
//i2c_Start();
I2C1_C1 |= ( I2C_C1_TX_MASK );

I2C1_C1 |= ( I2C_C1_MST_MASK ) ;
/* send ID with Write bit */
//i2c_write_byte(u8AddressW);
I2C1_D = u8AddressW;
i2c_Wait();
// send Register address
//i2c_write_byte(u8Register);
I2C1_D = u8Register;
printf("register");
i2c_Wait();
// send repeated start to switch to read mode
//i2c_RepeatedStart();
I2C1_C1 |= ( I2C_C1_RSTA_MASK ) ;
// re send device address with read bit
//i2c_write_byte(u8AddressR);
I2C1_D = u8AddressR;
i2c_Wait();
// set K40 in read mode
// i2c_EnterRxMode();
I2C1_C1 &= ~I2C_C1_TX_MASK;
I2C1_C1 |= I2C_C1_TXAK_MASK;
u8Data = I2C1_D;
//i2c_read_byte();
// send stop signal so we only read 8 bits
//i2c_Stop
I2C1_C1 &= ~( I2C_C1_TX_MASK );
debug_printf("%c",u8Data);
return 1;
}
while(1)
{I2C_ReadRegister_uc(0xFA,' $$');}
}

$$ i cant fnd the register name to access.

while i tried to run it was printing FA directly.

Re: eeprom read i2c kinetis

mjbcswitzerland — Fri, 27 Sep 2019 10:57:51 GMT

The pins need to be set to open-drain mode, as well as to their I2C peripheral mode.
I2C: http://www.utasker.com/docs/uTasker/uTasker_I2C.pdf

Don't forget that I2C dead-lock recovery should be considered for real product development:
https://community.nxp.com/thread/322977

Proven I2C solution with EEPROM support (and simulation for Kinetis, I2C controller and EEPROM is available in the open source uTasker project (link below).

Regards

Mark

Complete Kinetis solutions for professional needs, training and support: http://www.utasker.com/kinetis.html

uTasker: supporting >1'000 registered Kinetis users get products faster and cheaper to market

Request Free emergency remote desk-top consulting at http://www.utasker.com/services.html

Open Source version at https://github.com/uTasker/uTasker-Kinetis

https://community.nxp.com/thread/512558

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eeprom read i2c kinetis

Re: eeprom read i2c kinetis