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Tool/software: Code Composer Studio
Dear all,
I'm getting stuck with the external power with the launchpad. When I used the debugger tool to supply power to the kit just for testing the on-board LED, everything was okay. But when I connected an external 3.6VDC to the kit, the MCU did not work. The power was taken from a DC signal generator. Jumper J10 was set to "External". VCC on J12, J1, and J4 were measured to be 3.6V.
Below is my code for testing the kit. I do not understand why this happened, because the code was perfect with the power from USB (jumper J10 set to "Debugger").
#include <msp430fr5969.h>
/**
* main.c
*/
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // stop watchdog timer
PM5CTL0 &= ~LOCKLPM5;
P1DIR = 0xFF;
P1OUT = 0x00;
P2DIR = 0xFF;
P2OUT = 0x00;
P3DIR = 0xFF;
P3OUT = 0x00;
P1DIR |= 0x01;
P1OUT |= BIT0;
TA0CCTL0 = CCIE; // CCR0 interrupt enabled
TA0CCR0 = 50000;
TA0CTL = TASSEL__SMCLK | MC__CONTINOUS; // SMCLK, continuous mode
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
// Timer A0 interrupt service routine; Blinking LED for debugging
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer0_A0_ISR (void)
{
P1OUT ^= 0x01; // Toggle P1.0
TA0CCR0 += 50000; // Add Offset to CCR0
}
Thank you in advance for any comment.
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