Here is the master RX single byte from the slave: ( msp430g2xx3_uscib0_i2c_04.c ) /* -COPYRIGHT-,BSD_EX It is better if i give the two example of TI here. Can you point out what seems to be the problem here?Įdit: It is better if i put the two examples from TI resource here aswell. I'm sure about the circuit (full with pull-up resistors) because that is working on an Arduino. I don't really know why is this happening but SDA and SCL clocks keeps locking to 0V. While (UCB0CTL1 & UCTXSTT) // Start condition sent? UCB0CTL1 |= UCTXSTT // I2C start condition

_bis_SR_register(CPUOFF + GIE) // Enter LPM0 w/ interrupts UCB0CTL1 |= UCTR + UCTXSTT // I2C TX, start condition UCB0CTL1 &= ~UCSWRST // Clear SW reset, resume operation UCB0CTL1 = UCSSEL_2 + UCSWRST // Use SMCLK, keep SW reset UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC // I2C Master, synchronous mode IFG2 &= ~UCB0TXIFG // Clear USCI_B0 TX int flag UCB0CTL1 |= UCTXSTP // I2C stop condition _bic_SR_register_on_exit(CPUOFF) // Exit LPM0 It is structured such that it can be used to receive The USCI_B0 data ISR is used to move received data from the I2C slave While (UCB0CTL1 & UCTXSTP) // Ensure stop condition got sent P1SEL2|= BIT6 + BIT7 // Assign I2C pins to USCI_B0 P1SEL |= BIT6 + BIT7 // Assign I2C pins to USCI_B0

Unsigned char PRxData // Pointer to RX data I combined these two sets of code and came up with code for my ITG-3200 which uses a write operation followed by a read for reading it's registers. I'm using two I☬ examples provided from TI msp430g2xx3_uscib0_i2c_04 (single read) and msp430g2xx3_uscib0_i2c_06 (single write). What I'm trying to do is to accomplish this on the MSP Launchpad. After checking the example code on the Arduino (I checked the data flow on buses with an oscilloscope) I realised that even with a Stop-Start condition it should work. The ITG-3200 uses a repeated start to read from a specific register. Here is the Launchpad datasheet and user guide and the ITG-3200 datasheet. I've been trying to use an I☬ bus between a MSP430G2553 launchpad and ITG-3200 gyroscope breakout.

Wire library energia