Re: [Mspgcc-users] I2C Initialisation Problem

[Ciaran Davies]

Hi, thanks for the reply. The issue arose a couple of things: first, starting and stopping the  transfer too quickly. Also, the UART interrupts were also causing issues. See below: interrupt(USCITX_VECTOR) USCIAB0TX_ISR(void) {       if((IFG2 & UCB0RXIFG) != 0) //I2C RX     {         :         :               UCB0CTL1 |= UCTXSTP;                    // I2C stop condition              [Set some flag if all bytes received]        :        :     }     else // Some UART code     {     } }       WDTCTL = WDTPW + WDTHOLD;             // Stop WDT       P3SEL |= 0x06;                                                // Assign I2C pins to USCI_B0       UCB0CTL1 |= UCSWRST;                          // Enable SW reset       UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC;     // I2C Master, synchronous mode                                                      UCB0CTL1 = UCSSEL_2 + UCSWRST;            // Use SMCLK, keep SW reset       UCB0BR0 = 11;                             // fSCL = SMCLK/11 = 95.3kHz       UCB0BR1 = 0;       UCB0I2CSA = 0x48;                         // Slave Address is 048h       UCB0CTL1 &= ~UCSWRST;                     // Clear SW reset, resume operation       IE2 |= UCB0RXIE + UCB0TXIE;                          // Enable RX interrupt       UCB0CTL1 |= UCTXSTT;                    // I2C start condition       while(!flag)      {           UCB0CTL1 |= UCTXSTT;                    // I2C start condition      } Sergey A. Borshch wrote: Ciaran Davies wrote: I'm getting no interrupts generated and putting a scope on the I2C data line or clock line shows no activity at all. Seems like nothing wrong in your code. Did you enabled global interrupts ( eint() )? Which levels scope shows on SCL and SDA? Do you have external pull-ups on SCL and SDA? Which levels scope shows on SDA and SCL with MSP430 reset input tied low? Sergey ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Mspgcc-users mailing list Mspgcc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mspgcc-users