Wu Jianying Microcontroller Development Board Address
Taobao Store:【Wu Jianying’s Shop】
Address:【https://item.taobao.com/item.htm?_u=ukgdp5a7629&id=524088004171】
After working for 7 months, I have gradually become familiar with programming microcontrollers. Previously, I always knew that microcontrollers combined timers, state machines, and interrupts, which was quite efficient. However, after taking over the development of the GPF chip, I discovered another kind of microcontroller development technique. Experts, please bypass this.
We all know that delays in programs can affect the real-time performance of microcontrollers, leading to a significant decrease in efficiency. However, in the development of the GPF chip, the system delay and initialization were combined by the supplier, so calling the program requires a certain loop to ensure that the program runs normally. I actually don’t know why they did it this way.
In work, modifying a source code is not something that can be done casually. At that time, I created a program, and I won’t disclose the source code, but I will write a case to explain:
void test()
{
int i = 0 ;
int tick ;
int BatteryStatus = 0;
int Voltage ;
int count = 0 ;
int Voltage_value ;
char ch ;
scanf(“%d”,&BatteryStatus);
while(1)
{
delay_20ms();
switch(BatteryStatus)
{
case 1:
if(count == 50)
{
printf(“0x%x\n”,0xE1);
count = 0 ;
};break ;
case 2:
if(count == 50)
{
printf(“0x%x\n”,0x90); // Send general ‘1’ signal
count = 0 ;
};break ;
default:
break ;
}
count++ ;
#if 0
ch = getch(); // Assume I set a key here
if(ch == ‘q’)
{
printf(“%x”,0x48);
break ;
}
#endif
}
}
In the while loop, first there is a delay of 20 ms, then the count counter increments. When it reaches 50, which is one second, it resets. At this point, if a key is pressed, it will not be disturbed, and the program runs normally, maintaining high efficiency. If at this time delay_20ms is changed to delay_1000ms, the program will have to wait 1 second for each key scan, affecting efficiency. The count value can be estimated by oneself and does not need to be too precise. Such a program can achieve functions similar to that of a timer without requiring too precise a delay.
If you like this article，please give a thumbs up
|
Technology Comes from Accumulation, Success Comes from Perseverance ——Microcontroller Detailed Explanation by Wu Jianying |