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Hey there, I have tried to make a program which can give me the data from my sensor SI7006-20A with I2C. The problem is, that when I run my project, nothing happens. I also used an Logic Analyzer and I saw that nothing happened. I really don't know what I could change. Maybe someone could help me, thanks a lot!
#include "main.h" #include "msp430f5529.h" unsigned char add = 0x80; // serial number of the sensor unsigned char RHMeasure = 0xE5; unsigned char TEMpMeasure = 0xE0; double temp, rh; int help1, help2; void initI2C(){ UCB0CTL1 |= UCSWRST; UCB1CTL0 = (1<<UCMST)|(1<<UCMODE0)|(1<<UCMODE1)|(1<<UCSYNC); UCB1CTL1=(1<<UCSSEL1)|(1<<UCTR); UCB1BR0 = 200; UCB1BR1 = 0; UCB1I2CSA = (add>>1); UCB1CTL1 &= ~(1<<UCSWRST); } void sendDataI2C(unsigned char data){ UCB1CTL1|= (1<<UCTXSTT); UCB1TXBUF = data; while(UCB1IFG&(1<<UCTXIFG)==0x00); UCB1CTL1 |= (1<<UCB1IFG); } unsigned char readDataI2C(){ } unsigned int startRead(){ unsigned int data=0; UCB1CTL1&=~(0x10); UCB1CTL1 |=(1<<UCTXSTT); // while(UCB1CTL1 &(1<<UCTXSTT)); if(UCB1CTL1 &(1<<UCTXSTT)){ P1DIR |= BIT0; P1OUT |= BIT0; }else{ P4DIR |= BIT7; P4OUT |= BIT7; } // while(UCB1STAT&(1<<UCBBUSY) > 0x00); while(UCB1IFG&(1<<UCRXIFG)==0x00); data = UCB1RXBUF*256; while(UCB1IFG&(1<<UCRXIFG)==0x00); data += UCB1RXBUF; UCB1CTL1 |= (1<<UCTXNACK); UCB1CTL1 |= (1<<UCTXSTP); } void startWrite(unsigned char cmd){ UCB1CTL1|=(1<<UCTXSTT)|(0x10); //UCB1CTL1 |= (1<<UCTXSTP); UCB1TXBUF = cmd; while(UCB1IFG&(1<<UCTXIFG)==0x00); } int main(){ WDTCTL = WDTPW + WDTHOLD; P4DIR |= BIT2; P4DIR |= BIT1; initI2C(); while(1){ startWrite(RHMeasure); /* help2 = startRead(); rh = (help2*125)/65536-6; startWrite(TEMpMeasure); help1 = startRead(); temp = (help1*175.72)/65536-46.85; */ __delay_cycles(100); } } |
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Hi
UCB1CTL1=(1<<UCSSEL1)|(1<<UCTR); |
translates to
UCB1CTL1=(1<<0x80)|(1<<0x10); |
which leads to a warning. Dont use avr-stylish shift operations. Use instead
UCB1CTL1 = UCSSEL1 | UCTR; |
Take the compiler warnings serious.
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Thanks for your answer, but unfortunately nothing changed. I still see nothing on my Logic Analyzer
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The only functiopn that you call from main() is startWrite(). Can that work without a prior call to initI2C()?
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Alex A. wrote: > but unfortunately nothing changed. Same warnings/errors after compiling? Show the changed code pls! stefanus wrote: > The only functiopn that you call from main() is startWrite(). Can that > work without a prior call to initI2C()? Try once more... ;-)
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I have the init above the while and I have just warnings of missing return statement but I ignored this because i just want to check the init. And it isn't working...
#include "main.h" #include "msp430f5529.h" unsigned char add = 0x80; unsigned char RHMeasure = 0xE5; unsigned char TEMpMeasure = 0xE0; double temp, rh; int help1, help2; void initI2C(){ UCB0CTL1 |= UCSWRST; UCB1CTL0 = UCMST | UCMODE0 | UCMODE1 | UCSYNC; //MasterMode I2C Mode UCB1CTL1= UCSSEL1 | UCTR; UCB1BR0 = 200; //fSCL = SMCLK/(40+0*256) UCB1BR1 = 0; UCB1I2CSA = (add>>1); UCB1CTL1 &= ~UCSWRST; } void sendDataI2C(unsigned char data){ UCB1CTL1|= UCTXSTT; UCB1TXBUF = data; while((UCB1IFG & UCTXIFG)==0x00); UCB1CTL1 |= UCB1IFG; } unsigned char readDataI2C(){ } unsigned int startRead(){ unsigned int data=0; UCB1CTL1 &=~ (0x10); UCB1CTL1 |= UCTXSTT; // while(UCB1CTL1 & UCTXSTT); if(UCB1CTL1 & UCTXSTT){ P1DIR |= BIT0; P1OUT |= BIT0; }else{ P4DIR |= BIT7; P4OUT |= BIT7; } // while((UCB1STAT & UCBBUSY) > 0x00); while((UCB1IFG & UCRXIFG) == 0x00); data = UCB1RXBUF*256; //ACK automatisch vermutlich while((UCB1IFG & UCRXIFG) == 0x00); data += UCB1RXBUF; UCB1CTL1 |= UCTXNACK; UCB1CTL1 |= UCTXSTP; } void startWrite(unsigned char cmd){ UCB1CTL1 |= UCTXSTT | (0x10); //UCB1CTL1 |= UCTXSTP; UCB1TXBUF = cmd; while((UCB1IFG & UCTXIFG) == 0x00); } int main(){ WDTCTL = WDTPW + WDTHOLD; P4DIR |= BIT2; P4DIR |= BIT1; while(1){ initI2C(); startWrite(RHMeasure); /* help2 = startRead(); rh = (help2*125)/65536-6; startWrite(TEMpMeasure); help1 = startRead(); temp = (help1*175.72)/65536-46.85; */ __delay_cycles(100); } } |
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Alex A. wrote: > UCB0CTL1 |= UCSWRST; This resets the wrong module; use UCB1CTL1. > UCB1CTL1= UCSSEL1 | UCTR; This clears the reset bit, and the following baud rate setting is not applied. > UCB1CTL1 |= UCTXSTT | (0x10); The 0x10 is the UCTXNACK bit. What's it doing here? > UCB1TXBUF = cmd; You can do that only after you have checked that the buffer is free (TXIFG). > P4DIR |= BIT2; > P4DIR |= BIT1; This sets these two pins as GPIO outputs. To connect these pins to the I²C module instead, set the bits in P4SEL. I would recommend to begin with a working example like MSP430F55xx_uscib0_i2c_08.c.
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