96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
#include <stdint.h>
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#include "tm4c123gh6pm.h"
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/**
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* main.c
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*/
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void GPIO_PORTF_Init(void);
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void SystickHandler(void);
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void Systick_Init(void);
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volatile uint32_t systick_count = 1;
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volatile uint32_t global_counter = 0;
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int main(void)
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{
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GPIO_PORTF_Init();
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//Systick_Init();
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while(1);
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}
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void SW2_Handler(void)
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{
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//Start with some nops and then try some dela
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//GPIO_PORTF_DATA_R ^= 0x2;
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global_counter ++;
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//GPIO_PORTF_ICR_R = 0x10;
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GPIO_PORTF_ICR_R = 0x10;
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__asm(" DSB");
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}
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void SystickHandler(void)
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{
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systick_count++;
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if(systick_count==1000)
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{
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systick_count = 0;
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GPIO_PORTF_DATA_R ^= 0x2;
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}
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}
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void Systick_Init()
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{
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NVIC_ST_RELOAD_R = 0x9C4;
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NVIC_ST_CURRENT_R = 0x0;
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//Enable Systick:
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// SYST_CSR = 0x00000101 -- 0x5
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NVIC_ST_CTRL_R = 0x5;
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}
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void GPIO_PORTF_Init(void)
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{
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//PF0 <-- SW2
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//PF4 <-- SW1
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//Need to enable interrupt on SW1
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SYSCTL_RCGC2_R |= SYSCTL_RCGC2_GPIOF;
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GPIO_PORTF_DEN_R = 0x1F;
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GPIO_PORTF_PUR_R = 0x11;
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GPIO_PORTF_DIR_R = 0x0E;
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//Shut off all LEDs:
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GPIO_PORTF_DATA_R=0x0;
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// Enabling Interrupts
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//GPIOIS -- Interrupt Sense --> 0 for edge --> 0x0
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GPIO_PORTF_IS_R = 0x0;
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//GPIOIBE -- Both Edges --> 0 for single edge --> 0x0
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GPIO_PORTF_IBE_R = 0x0;
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//GPIOIEV -- Interropt Event --> 0 for falling edge --> 0x00
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GPIO_PORTF_IEV_R = 0x0;
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//GPIOICR -- Interript clear -- must be cleared by writing 1 to corresponding bit --> 0xff
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GPIO_PORTF_ICR_R = 0xff;
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//GPIOIM -- Interrupt Mask --> 1 for unmasked (enabled)--> 0x01
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GPIO_PORTF_IM_R = 0x10;
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//GPIORIS -- Raw Int Status
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//GPIOMIS -- Masked Int Status
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//Interrupt Number = 30
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// EN0 -- 0x40000000
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NVIC_EN0_R = 0x40000000;
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}
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