/*
Note: This program mainly shows how to use the timer to count
. It is a relatively simple program that reflects modular sub-functions
*/
#include
#define uchar unsigned char //macro definition
#define uint unsigned int
uchar count; //define global variables
void display_led() //led display sub-function
{
if(count==20) //changes every 1S (crystal oscillator: 12MHZ)
{
count=0; //count cleared for next count
P2=~P2; //P2 value inverted
P2=P2<<1; //P2 value shifted left
P2=~P2;
if(P2==0xff) //if the last LED is on,
P2=0xfe; //then the first LED is on
}
}
void init() //initialization sub-function
{
EA=1; //turn on total interrupt
ET0=1; //turn on timer interrupt
TR0=1; //start timer
TMOD=0x01; //T0 working mode 1, 16-bit counting
TH0=(65536-50000)/256; //Set the initial value of the timer
TL0=(65536-50000)%256;
P2=0xfe; //Assign initial value to P2 port
while(1)
{
display_led(); //Call LED display sub-function
}
}
void main() //Main function
{
init(); //Call initialization sub-function
}
void delay() interrupt 1 //Timed interrupt sub-function
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++; //Count variable plus 1
}
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Building_a_Modular_Codebase_with_Zephyr_RTOS_and_Devicetree
Arduino Development Guide: STM32
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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