hello all,
the one below is the example code for ADC. You can notice, in the code that the output of this code is red, blue and green lights switching on based on the onboard Potentiometer input.
My Question is : How can I read the exact potentiometer value. How can I print that value. How can I use print function here. So that whenever the potentiometer changes, I can see the value of ADC result in mV (0-5000mv) and also see the change of lights based on the value according to code.
#include "S32K144.h" /* include peripheral declarations S32K144 */
#include "clocks_and_modes.h"
#include "ADC.h"
#define PTD15 15 /* RED LED*/
#define PTD16 16 /* GREEN LED*/
#define PTD0 0 /* BLUE LED */
void PORT_init (void) {
PCC->PCCn[PCC_PORTD_INDEX ]|=PCC_PCCn_CGC_MASK; /* Enable clock for PORTD */
PORTD->PCR[PTD0] = 0x00000100; /* Port D0: MUX = GPIO */
PORTD->PCR[PTD15] = 0x00000100; /* Port D15: MUX = GPIO */
PORTD->PCR[PTD16] = 0x00000100; /* Port D16: MUX = GPIO */
PTD->PDDR |= 1<<PTD0; /* Port D0: Data Direction= output */
PTD->PDDR |= 1<<PTD15; /* Port D15: Data Direction= output */
PTD->PDDR |= 1<<PTD16; /* Port D16: Data Direction= output */
}
void WDOG_disable (void){
WDOG->CNT=0xD928C520; /* Unlock watchdog */
WDOG->TOVAL=0x0000FFFF; /* Maximum timeout value */
WDOG->CS = 0x00002100; /* Disable watchdog */
}
int main(void)
{
uint32_t adcResultInMv=0;
WDOG_disable(); /* Disable WDOG*/
SOSC_init_8MHz(); /* Initialize system oscillator for 8 MHz xtal */
SPLL_init_160MHz(); /* Initialize SPLL to 160 MHz with 8 MHz SOSC */
NormalRUNmode_80MHz(); /* Init clocks: 80 MHz sysclk & core, 40 MHz bus, 20 MHz flash */
PORT_init(); /* Init port clocks and gpio outputs */
ADC_init(); /* Init ADC resolution 12 bit*/
for(;;) {
convertAdcChan(12); /* Convert Channel AD12 to pot on EVB */
while(adc_complete()==0){} /* Wait for conversion complete flag */
adcResultInMv = read_adc_chx(); /* Get channel's conversion results in mv */
if (adcResultInMv > 3750) { /* If result > 3.75V */
PTD->PSOR |= 1<<PTD0 | 1<<PTD16; /* turn off blue, green LEDs */
PTD->PCOR |= 1<<PTD15; /* turn on red LED */
}
else if (adcResultInMv > 2500) { /* If result > 2.5V */
PTD->PSOR |= 1<<PTD0 | 1<<PTD15; /* turn off blue, red LEDs */
PTD->PCOR |= 1<<PTD16; /* turn on green LED */
}
else if (adcResultInMv >1250) { /* If result > 1.25V */
PTD->PSOR |= 1<<PTD15 | 1<<PTD16; /* turn off red, green LEDs */
PTD->PCOR |= 1<<PTD0; /* turn on blue LED */
}
else {
PTD->PSOR |= 1<<PTD0 | 1<< PTD15 | 1<<PTD16; /* Turn off all LEDs */
}
convertAdcChan(29); /* Convert chan 29, Vrefsh */
while(adc_complete()==0){} /* Wait for conversion complete flag */
adcResultInMv = read_adc_chx(); /* Get channel's conversion results in mv */
}
}
Hope, you understood my question. Please help me out how ever possiblle. Thank You
