55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
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/* PeriodicSysTickInts.c
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* Jonathan Valvano
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* July 19, 2025
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* Derived from timx_timer_mode_periodic_sleep_LP_MSPM0G3507_nortos_ticlang
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* gpio_toggle_output_LP_MSPM0G3507_nortos_ticlang
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*
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*/
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#include <ti/devices/msp/msp.h>
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#include "../inc/LaunchPad.h"
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#include "../inc/Clock.h"
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// PA0 is red LED1, index 0 in IOMUX PINCM table
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// PB22 is BLUE LED2, index 49 in IOMUX PINCM table
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// PB26 is RED LED2, index 56 in IOMUX PINCM table
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// PB27 is GREEN LED2, index 57 in IOMUX PINCM table
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// PA18 is S1 positive logic switch, index 39 in IOMUX PINCM table
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// PB21 is S2 negative logic switch, index 48 in IOMUX PINCM table
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// DOUTTGL31_0 is used so the code is thread-safe.
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uint32_t Count;
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void SysTick_IntArm(uint32_t period, uint32_t priority){
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SysTick->CTRL = 0x00; // disable during initialization
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SysTick->LOAD = period-1; // set reload register
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//The ARM Cortex-M0+ only implements the most significant 2 bits of each 8-bit priority field (giving the 4 priority levels).
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SCB->SHP[1] = (SCB->SHP[1]&(~0xC0000000))|priority<<30; // set priority (bits 31,30)
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SysTick->VAL = 0; // clear count, cause reload
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SysTick->CTRL = 0x07; // Enable SysTick IRQ and SysTick Timer
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}
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#define PA12INDEX 33
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int main(void){
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__disable_irq();
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LaunchPad_Init();
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// Clock_Init(OSCFREQ32MHZ);
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Clock_Init40MHz();
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// Clock_Init80MHz(0);
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Count = 0;
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// SysTick_IntArm(16000000,2); //32M/16M = 2Hz
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SysTick_IntArm(400000,2); //40M/400k = 100Hz
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// SysTick_IntArm(800000,2); //80M/800k = 100Hz
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__enable_irq();
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while(1){
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GPIOA->DOUTTGL31_0 = RED1;
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}
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}
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void SysTick_Handler(void){
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GPIOB->DOUTTGL31_0 = GREEN; // toggle PB27
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GPIOB->DOUTTGL31_0 = GREEN; // toggle PB27
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Count++;
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GPIOB->DOUTTGL31_0 = GREEN; // toggle PB27
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}
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