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EdgeTriggeredInt/EdgeTriggeredIntmain.c

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+/* 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
+    }
+  }
+}
+*/
+
+