Tool/software: Code Composer Studio
Hello,
I would like to setup the SPI-MASTER Mode for the USCIB1 Module - interrupt handled.
Setting up by polling the UCBUSY Bit in UCB1STAT Register works - no problem.
But when I try to setup the interrupt, nothing happens.
In CCS I recognized, that the enabling of the two interrupt enable bits in UCB1IE doesn't take any effect. Also the UCB1IFG Register can't be cleared.
My initialisation routine is:
void main(){
...
UCB1CTL1|=0x01 ; // UCSWRST Reset Hold
UCB1CTL0|=0x08|0x80; // Master Mode + Positive Edge Sample
UCB1CTL1|=0x40; // ACLK Select.
UCB1BR0=1; // LSB Clock Prescaler
UCB1BR1=0; // MSB Clock Prescaler
// UCB1STAT NOTHING TO DO
UCB1RXBUF=0; // RX-Buffer zero
// UCB1TXBUF nothing to be done
UCB1IE=0x03; // UCB1IE - Interrupts enabled - No Effect!
UCB1IFG=0; // UCB1IFG cleared - No Effect!!
// UCB1IV nothing to be done
P4SEL|=0x0e; // MOSI MISO SCK;
UCB1CTL1&=0xfe; // Clear UCSWRST Reset Hold Bit - SPI READY for USE
__bis_SR_register(GIE);
...
}
and my interrupt service routine (never reached) is given by:
#pragma vector=USCI_B1_VECTOR // Merke: Bezeichner ist im Linker Command File zu finden.
__interrupt void SPIHandler(void){
char tmp;
switch(__even_in_range(UCB1IV,0x04)){
}
P3OUT ^= 0x04;
}
Could You explain me why I can't set the UCB1IE Bits?? Or what is my mistake??
I'll study the driverlib now - but I prefer understanding the Registers.... thank You!
