58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
|
/* EdgeTriggeredIntmain.c
|
||
|
|
* Interrupt from Switch S3, output to LEDs
|
||
|
|
* Jonathan Valvano
|
||
|
|
* July 19, 2025
|
||
|
|
* Derived from gpio_toggle_output_LP_MSPM0G3507_nortos_ticlang
|
||
|
|
* gpio_input_capture_LP_MSPM0G3507_nortos_ticlang
|
||
|
|
*/
|
||
|
|
// Brief description of the program:
|
||
|
|
// An interrupt is invoked on the falling edge of S2 (PB21).
|
||
|
|
// When S2 is touched (falling edge) the red LED is toggled.
|
||
|
|
// The green LED is toggled in the main program.
|
||
|
|
// DOUTTGL31_0 is used so the code is thread-safe.
|
||
|
|
|
||
|
|
|
||
|
|
#include <ti/devices/msp/msp.h>
|
||
|
|
#include "../inc/EdgeTriggered.h"
|
||
|
|
#include "../inc/LaunchPad.h"
|
||
|
|
|
||
|
|
// PA0 is red LED1, index 0 in IOMUX PINCM table
|
||
|
|
// PB22 is BLUE LED2, index 49 in IOMUX PINCM table
|
||
|
|
// PB26 is RED LED2, index 56 in IOMUX PINCM table
|
||
|
|
// PB27 is GREEN LED2, index 57 in IOMUX PINCM table
|
||
|
|
// PA18 is S1 positive logic switch, index 39 in IOMUX PINCM table
|
||
|
|
// PB21 is S2 negative logic switch, index 48 in IOMUX PINCM table
|
||
|
|
// Insert J5: Connects PB22 to blue LED2
|
||
|
|
// Insert J6: Connects PB26 to red LED2
|
||
|
|
// Insert J7: Connects PB27 to green LED2
|
||
|
|
uint32_t Count;
|
||
|
|
int main(void){
|
||
|
|
__disable_irq();
|
||
|
|
EdgeTriggered_Init();
|
||
|
|
Count = 0;
|
||
|
|
__enable_irq();
|
||
|
|
while(1){
|
||
|
|
GPIOB->DOUTTGL31_0 = GREEN; // toggle PB27
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// do not need to use IIDX when there is a single interrupt source
|
||
|
|
void GROUP1_IRQHandler(void){
|
||
|
|
Count++; // number of touches
|
||
|
|
GPIOB->DOUTTGL31_0 = RED; // toggle PB26
|
||
|
|
GPIOB->CPU_INT.ICLR = 0x00200000; // clear bit 21
|
||
|
|
}
|
||
|
|
// use IIDX when there are multiple interrupt sources
|
||
|
|
/*
|
||
|
|
void GROUP1_IRQHandler(void){
|
||
|
|
uint32_t stat;
|
||
|
|
while((stat = GPIOB->CPU_INT.IIDX)!=0){
|
||
|
|
if(stat == 22){ // PB21
|
||
|
|
Count++; // number of touches
|
||
|
|
GPIOB->DOUTTGL31_0 = RED; // toggle PB26
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
|
||
|
|
|