If you want to have a 4 second delay and you have configured SysTick to create 0.2 second delay, how do you get a 4 second delay in software?
Answer in C code.
C Code:
#include "LPC17xx.h"
volatile uint32_t tickCount = 0; /* Variable to count 0.2 seconds
ticks */
/* Interrupt Hanlder of SysTick for 0.2 seconds */
/* The control of the program comes to this function after each 0.2
second */
void SysTick_Handler(void) {
tickCount++; /* See startup file startup_LPC17xx.s for SysTick
vector */
}
void dealy_4_Second(void){
/* Waiting for the 20 tickCount, for 4 seconds and control will be
inside while loop */
while(tickCount%20);
}
int main (void) {
/* Configuring SysTick for 0.2 = 200 milliseconds */
uint32_t sysConfigReturn;
sysConfigReturn = SysTick_Config(200*SystemCoreClock / 1000);
/* Code before delay */
delay_4_Second();
/* Code after delay */
while(1); // continuous loop
return 0;
}
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