Other Parts Discussed in Thread: MSP430G2553
#include"msp430g2553.h"
void configTA0();
void configTA1();
unsigned int i =1,count=0,j=0,k,j_prev=0; // used as counters
unsigned int c1,c2,cc,dump;
char anand = 0x01;
// count for capacitance measure
//----------------------------------0bXXabcCBA
#define sw1 0xF1 // 0b11110001
#define sw2 0xC1 // 0b11000001
//
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% MAIN PROGRAM %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
void main(void) {
WDTCTL = WDTPW + WDTHOLD; // stop watchdog timer
BCSCTL1 = CALBC1_1MHZ; // Set range
DCOCTL = CALDCO_1MHZ; // Set DCO step and modulation
P1DIR = 0xFF; // Set all pins of P1 as output
P1OUT = 0xFF; // Set all pins of P1 high to reduce power consumption
P2DIR = 0xFF; // Set P2 as output port for switching signal
configTA1(); // config TIMERA1 for Integration switching time period(using ccr1) and fixed time(using ccr0)
count=0; // counter to keep track of 3 different cycles
//while(1)
//{
TA1CTL |= TASSEL_2 + TACLR + MC_2 + ID_0; // TACLK = SMCLK, clear timer
__bis_SR_register(CPUOFF + GIE); // enter low power mode with global interrupt enabled (start charging for cycles (output is -ve) till fixed time)
//i=1;
//}
while(1); // halt for testing single cycle
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% MAIN PROGRAM END %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// ----------------- TIMER TA1 subroutine definition --------------------------
void configTA1()
{
TA1CCR0 = 5000; // Overall time for integration
TA1CCR1 = 30; // switching interval
TA1CCTL0 |= CCIE; // Compare-mode interrupt enable for ccr0 (overall intg time)
TA1CCTL1 |= CCIE; // compare mode interrupt enable for ccr1 (switching time)
TA1CTL |= TASSEL_2 + TACLR; // TACLK = SMCLK, clear timer
}
//------------------ Timer TA1 CCR0 flag ISR ---------------------------------
#pragma vector=TIMER1_A0_VECTOR
__interrupt void ta1_ccr0(void)
{
TA1CTL = MC_0; // stop TA1 (So N0 more INTERRUPT DUE TO TIMER1)
k++; // counter to check no of times this ISR executed
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0 on return
}
//------------------ Timer TA1 TA1IV ISR ---------------------------------
#pragma vector=TIMER1_A1_VECTOR
__interrupt void ta1_taiv(void)
{
switch (i)
{
case 1:
P2OUT = sw1;
i=2;
break;
case 2:
P2OUT = sw2;
i=1;
break;
}
j++ ; // counter to check no of times this ISR executed
TA1CCR1 += 30;
TA1CCTL1 &=~CCIFG; // clear flag (required to clear explicitly in TA1IV vector) and remain in LPM0 even after servicing interrupt
//__bic_SR_register_on_exit(CPUOFF); // Exit LPM0 on return
}
I am trying to send data at P2 after every 30 micro sec and stop sending after 5000 micro sec ( 5 milli sec) but if I use the switch case for sending two different data alternatively , counter values end up as j =1 and k =1 instead of j =167 and k =1. It works perfectly fine if the whole switch case code is not present in Timer TA1 TA1IV ISR
Can anyone help me out , what is the problem?
Thanks in advance
