Hello,
I am using the KL05-FRDM board. I want to trigger ADC conversions, via the LPTMR.
The LPTMR can be clocked by the MCRIRCLK (which is 32KH). I am toggling a pin with a value of '1' in
the CMR register. This si sdone to c the minimum clock/cycle. I saw that it is 2.5msecs, which is something
I was not expecting. WIth a prescaler of 2- the clock wld be 16KH. So a an avg of 62uSecs is what I was expecting.
The code is given -
int main(void)
{
int count;
uint16_t countTemp = 0;
SIM_SOPT1 = 0;
SIM_SCGC5 |= (SIM_SCGC5_LPTMR_MASK | SIM_SCGC5_PORTB_MASK);//PORTC_PCR1 |= PORT_PCR_MUX(1);//select RTC_CLKIN function
PORTB_PCR8 |= 0x00000100; // alternative pin mux selection //
GPIOB_PDDR |= 0x00000100; // pin direction //
SIM_SCGC5|=SIM_SCGC5_LPTMR_MASK;
/* Reset LPTMR settings */
SIM_SOPT1 = 0;
SIM_SCGC5 |= (SIM_SCGC5_LPTMR_MASK | SIM_SCGC5_PORTB_MASK);//PORTC_PCR1 |= PORT_PCR_MUX(1);//select RTC_CLKIN function
LPTMR0_CSR=0;
/* Set the compare value to the number of ms to delay */
LPTMR0_CMR = 1;
/* Start the timer */
LPTMR0_CSR |= LPTMR_CSR_TEN_MASK;
/* Wait for counter to reach compare value */
while(1){
while (!(LPTMR0_CSR & LPTMR_CSR_TCF_MASK));
/* Disable counter and Clear Timer Compare Flag */
LPTMR0_CSR &= ~LPTMR_CSR_TEN_MASK;
LPTMR0_CSR |= LPTMR_CSR_TCF_MASK;
GPIOB_PTOR |= (1<<8);
LPTMR0_CSR |= LPTMR_CSR_TEN_MASK;
}
}
Can anyone pls advice me why this is happening.
Vinod.
