Hello
I am trying to communicate with a 9DoF stick using I2C on the f5529. I was able to do the same thing using the g2553, but decided to switch to the 5529 because of its higher speed. Therefore, a lot of my code is patched together from my previous work using the 2553. The problem that I am having is that the code never enters the 2nd if statement (tx counter = 1) in the interrupt. What could be causing this? Code is posted below. I am using Energia.
Thanks
#include <msp430f5529.h>
#define ADXL345_ADDRESS (0xA6 >> 1)
//There are 6 data registers, they are sequential starting with th LSB of X.
//We'll read all 6 in a burst and won't address them individually
#define ADXL345_REGISTER_XLSB (0x32)
//Need to set power control bit to wake up the adxl345
#define ADXL_REGISTER_PWRCTL (0x2D)
#define ADXL_PWRCTL_MEASURE (1 << 3)
#define ITG3200_ADDRESS (0xD0 >> 1)
//request burst of 6 bytes from this address
#define ITG3200_REGISTER_XMSB (0x1D)
#define ITG3200_REGISTER_DLPF_FS (0x16)
#define ITG3200_FULLSCALE (0x03 << 3)
#define ITG3200_42HZ (0x03)
#define HMC5843_ADDRESS (0x3C >> 1)
//First data address of 6 is XMSB. Also need to set a configuration register for continuous measurement.
#define HMC5843_REGISTER_XMSB (0x03)
#define HMC5843_REGISTER_MEASMODE (0x02)
#define HMC5843_MEASMODE_CONT (0x00)
int accelerometer_data[3];
int gyro_data[3];
int magnetometer_data[3];
byte i2c_tx_reg;
byte i2c_tx_data;
int tx_counter;
int rx_counter;
int i;
volatile boolean i2c_busy;
byte read_data[6];
#pragma vector= USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void){
if(UCB0IFG & UCTXIFG){ //Tx interrupt
if(tx_counter == 2){
UCB0TXBUF = i2c_tx_reg;
tx_counter--;
}
else if(tx_counter == 1){
UCB0TXBUF = i2c_tx_data;
tx_counter--;
}
else if(tx_counter == 0){
UCB0CTL1 |= UCTXSTP; //Stop condition
UCB0IFG &= ~UCTXIFG; //Clear interrupt flag
i2c_busy = false;
}
}
}
void init_i2c(void){
UCB0IE &= ~(UCRXIE + UCTXIE); //Disable RX and TX interrupt
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 |= 0x0F; // I2C Master, synchronous mode
UCB0CTL1 |= UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset
UCB0BR0 = 0x80;
UCB0BR1 = 0x00;
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
UCB0IE |= UCRXIE + UCTXIE; //Enable RX and TX interrupt
}
void i2c_write(int address, byte reg, byte data){
while(UCB0CTL1 & UCTXSTP); //Wait for stop condition to clear
tx_counter = 2;
i2c_busy = true;
UCB0I2CSA = address; //Write slave address
i2c_tx_reg = reg;
i2c_tx_data = data;
UCB0CTL0 &= ~UCSLA10; //Set size of address to 7-bit
UCB0CTL1 |= UCTR;
UCB0CTL1 |= UCTXSTT; //Set for transmitter mode and generate a start condition
while(i2c_busy); //Wait for i2c to finish
}
void init_itg3200(){
//Set DLPF to 42 Hz and set the scale to "Full Scale"
i2c_write(ITG3200_ADDRESS, ITG3200_REGISTER_DLPF_FS, ITG3200_FULLSCALE | ITG3200_42HZ);
}
int main(void){
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P4SEL |= BIT1 + BIT2;
P4REN |= BIT1 + BIT2;
init_i2c();
__bis_SR_register(GIE);
i2c_busy = false;
while(1){
init_itg3200();
}
}
