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MSP 430 interface with EEPROM of power manager IC using I2C

Joseph Chacko
Prodigy 80 points

Hi all ,

I need to write a code (assembly)  to configure EEPROM registers of power manager IC (MAX 6889) using I2C.(MSP 430 as master and this IC as slave).

First I need to read the corresponding registers to know what is written on it and then configure it by myself.

just need the code below to be verified for the structure (slave address and actual configuration data doesnt  matter). In this code only write is attempted .Request suggestions to  'read corresponding registers' too.

Code to Configure I2C port and to Establish Communication with Power Manager
#include <msp430xG46x.h>
;-------------------------------------------------------------------------------
 RSEG CSTACK ; Define stack segment
;-------------------------------------------------------------------------------
 RSEG CODE ; Assemble to Flash memory
;-------------------------------------------------------------------------------
 RSEG INFO ; Assemble to INFORMATION MEMORY
;-----------------------------------------------------------------------------
RESET MOV.W #SFE(CSTACK),SP ; Initialize stack pointer
STOPWDT   MOV.W     WDTPW+WDTHOLD+WDTNMI+WDTTMSEL+WDTSSEL,&WDTCTL ; Stop Watch Dog Timer

START 
              MOV.W #TX_DATA0,R15 ;Address Of Tx_Data0 In R15
              MOV.W #TX_DATA1,R14 
              MOV.B #02,R11
              MOV.B #08,R10
SETUPSVS           MOV.B #018H,&SVSCTL            ;threshold voltage Vth = 1.9V
SETUPRTC           MOV.B #30h,&RTCCTL               ; real time clock in calendar mode
                               Bis.B #RTCBCD,&RTCCTL
SETUPP3 ; BIS.B #UCSWRST,&UCB0CTL1                 ;keeping the USCIB0 in reset
                      Bis.B #06h,&P3SEL                                      ; Assign I2C pins to USCI_B0
 
I2c               BIS.B #UCSWRST,&UCB0CTL1                                 ;holding the usci port high
                    MOV.B #0Fh,&UCB0CTL0                                            ;synch,I2C,master mode
                    BIS.B #UCSSEL_2+UCSWRST,&UCB0CTL1      ; Use SMCLK, keep SW reset
                     MOV.B #11,&UCB0BR0                                            ; fSCL = SMCLK/11 = 95.3kHz
                      MOV.B #00,&UCB0BR1
POWER MANAGER
                   BIS.B #UCB0TXIE,&IE2                    ; Enable TX interrupt
                   BIC.B #UCSWRST,&UCB0CTL1    ; Clear SW reset, resume operation 
                   MOV.W #050h,&UCB0I2CSA            ; Set slave address of Power Manager
 
                  TX BIS.B #UCTXSTT+UCTR,&UCB0CTL1      ;generate start condition in tx mode 
                 EINT ;                                                                        ; enable global interrupt
                  BIT.B #UCB0TXIFG,&IFG2                                   ; check if transmit interrupt flag is set
                 JNZ              USCIAB0TX_ISR0                             ;if set go to USCIAB0TX_ISR0 
 ;............................................................................... 
TX_DATA0
               DB 04h                         ; address of register in max6889
               DB 01H                         ;switch on max 6889
TX_DATA1 
                DB 09H ;port configuration registers from 09h to 0fh
                DB 055H ; configuring in output in subsequent write mode
                DB 055H
                DB 055H
                 DB 055H
                DB 055H
                 DB 055H
                 DB 055H

USCIAB0TX_ISR0 
                      MOV.B @R15+,&UCB0TXBUF                   ; moving the data in TX_DATA0 to Tx buffer
                      DEC R11                                                        ;for two data bytes
                     JNZ           USCIAB0TX_ISR0
 
 BIC.B #UCB0TXIFG,&IFG2                         ;transmit interrupt flag is cleared
 BIS.B #UCTXSTP,&UCB0CTL1                ;I2C stop condition
 BIC.B #UCTXSTP,&UCB0CTL1                ;moving out of stop condition
 BIS.B #UCTXSTT+UCTR,&UCB0CTL1   ;generate start condition in tx mode 
 
USCIAB0TX_ISR1
 MOV.B @R14+,&UCB0TXBUF ;transmitting the eight data bytes
 DEC R10
 JNZ USCIAB0TX_ISR1 
 
 BIC.B       #UCB0TXIFG,&IFG2
 BIS.B       #UCTXSTP,&UCB0CTL1
 
 
EXIT_TX
 BIC.B #UCB0TXIFG,&IFG2                 ; transmit interrupt flag is cleared
 BIS.B #UCTXSTP,&UCB0CTL1          ; I2C stop condition
 RETI
;------------------------------------------------------------------------------
 COMMON INTVEC ; Interrupt Vectors
;------------------------------------------------------------------------------
 ORG USCIAB0TX_VECTOR             ; USCI_B0 I2C Data Int Vector
 DW USCIAB0TX_ISR0
 ORG RESET_VECTOR                               ; MSP430 RESET Vector
 DW RESET ;

END

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