Other Parts Discussed in Thread: SYSCONFIG
Tool/software:
I'm trying to learn and understand more of the MSPM0 boards. I'm attempting to use a potentiometer to adjust the toggle speed of the RGB LED to switch between R, G and B. Currently, the pot is connected to ground, 3.3v and PA25. I've set the ADC12 to channel 2 and conversion memory 0. I've attempted it with two different approaches, one as an ISR caused by a change in the ADC value, another where the ADC value is constantly checked from a called function. When debugged, the LED switches between R, G and B at the initial set delay rate, but adjusting the pot does not result in any change to the toggle speed. Any help on the matter would be greatly appreciated.
ISR code:
#include "ti_msp_dl_config.h"
/* This results in approximately 1s of delay assuming 32MHz CPU_CLK */
int32_t DELAY = 32000000;
volatile uint16_t gAdcResult = 3000;
int main(void)
{
SYSCFG_DL_init();
NVIC_EnableIRQ(ADC12_0_INST_INT_IRQN);
// Default: all pins off apart from Green LED
DL_GPIO_clearPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_2_PIN | GPIO_LEDS_USER_LED_3_PIN);
DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_RED_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN );
DL_ADC12_enableConversions(ADC12_0_INST);
DL_ADC12_startConversion(ADC12_0_INST);
while (1) {
/* Start our ADC conversion */
/* Currently switches between RGB LEDs in pattern */
DELAY = (32000000*2*gAdcResult) / 4096;
//delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_RED_LED_1_PIN | GPIO_LEDS_USER_LED_2_PIN);
DELAY = (32000000*2*gAdcResult) / 4096;
//delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_USER_LED_2_PIN | GPIO_LEDS_USER_LED_3_PIN);
DELAY = (32000000*2*gAdcResult) / 4096;
//delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_USER_LED_3_PIN | GPIO_LEDS_RED_LED_1_PIN);
}
}
//Interrupt signal for new ADC value
void ADC12_0_INST_IRQHandler(void) {
switch (DL_ADC12_getPendingInterrupt(ADC12_0_INST)) {
case DL_ADC12_IIDX_MEM0_RESULT_LOADED:
gAdcResult = DL_ADC12_getMemResult(ADC12_0_INST, DL_ADC12_MEM_IDX_0);
break;
default:
break;
}
}
Function Call code:
#include "ti_msp_dl_config.h"
/* This results in approximately 1s of delay assuming 32MHz CPU_CLK */
int32_t DELAY = 32000000;
#define DELAY_MIN (10000000)
#define DELAY_MAX (64000000)
volatile uint16_t gAdcResult = 3000;
int32_t get_delay(void) {
int32_t ADC_RESULT = 0;
DL_ADC12_startConversion(ADC12_0_INST);
delay_cycles(1000); //Delay to let ADC update
ADC_RESULT = DL_ADC12_getMemResult(ADC12_0_INST, DL_ADC12_MEM_IDX_0);
int32_t delay = (ADC_RESULT*DELAY_MAX)/4096 + DELAY_MIN;
return delay;
}
int main(void)
{
SYSCFG_DL_init();
DL_GPIO_clearPins(GPIO_LEDS_PORT, GPIO_LEDS_USER_LED_2_PIN | GPIO_LEDS_USER_LED_3_PIN);
DL_GPIO_setPins(GPIO_LEDS_PORT, GPIO_LEDS_RED_LED_1_PIN | GPIO_LEDS_USER_TEST_PIN );
DL_ADC12_enableConversions(ADC12_0_INST);
DL_ADC12_startConversion(ADC12_0_INST);
while (1) {
/* Currently switches between RGB LEDs in pattern */
DELAY = get_delay();
delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_RED_LED_1_PIN | GPIO_LEDS_USER_LED_2_PIN);
DELAY = get_delay();
delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_USER_LED_2_PIN | GPIO_LEDS_USER_LED_3_PIN);
DELAY = get_delay();
delay_cycles(DELAY);
DL_GPIO_togglePins(GPIO_LEDS_PORT,
GPIO_LEDS_USER_LED_3_PIN | GPIO_LEDS_RED_LED_1_PIN);
}
}
