I have been away from microcontrollers for more than 8 years. Now I am back to microcontrollers, but I still don’t understand timing interrupts. Please help me!!!

Metosco

I have been away from microcontrollers for more than 8 years. Now I am back to microcontrollers, but I still don’t understand timing interrupts. Please help me!!! [Copy link]

 

Please help me, it needs to be solved urgently before the New Year; thank you all

okhxyyo

What is the specific problem? What is the question about?

tiankai001

Everyone is willing to help you, but they don't know what you want to do.

tiankai001

First, tell me what kind of microcontroller you use, then why you want to use the timer interrupt, what function to achieve, and where is it stuck at the moment? Is the interrupt service program incorrect? Or can't enter the timer interrupt at all? Or is the timer interrupt's timing inaccurate?

sxccxz

First, take a look at the clock timing interrupt mode threshold initial value interrupt enable total interrupt interrupt vector

hujj

Interrupts should not be difficult to understand and easy to apply. There are many examples on the Internet. Just find a suitable code to transplant.

bigbat

Excuse me, do you know what "interruption" means?

chunyang

If you want to get timely and effective help, first learn to describe the problem correctly and completely.

常见泽1

When the timing time is reached, an interrupt is entered???

Metosco

Thank you for your concern; Thank you all; I read it last night and understood that the timer counter is encapsulated inside and is dead. We just need to use it in the prescribed way. Then, now the problem comes again. The 12M clock runs at a maximum of 256US, and the frequency is only 3.9KHZ. I want to make a DA to control the power supply, which needs to be very stable and incremental.

Metosco

There are many things to do after the New Year. I want to make a breakthrough at the end of the year; otherwise, I won’t be able to get through 2019.

hujj

The original poster is very stingy with words, why not provide more information? At least tell the model of the microcontroller, which timer you plan to use, and what purpose you want to achieve.

Metosco

Hello, there is no MCU signal now. I simulated it on a PROTUES software, using the 51 core

Metosco

See the attached picture

Metosco

#include
#include
sbit P1_7=P1^7 ; void main() { unsigned a; TMOD=0x00; TH0=0xE0; TL0=0x18; a=10; TR0=1; if(TF0==1) { if(a==0) P1_7=~P1_7; a--; TF0=0; } } The above is my code; timer 0 counts A=10 times, P1.7 port is inverted once; this loop

hujj

It seems that the host needs to flip the specified port regularly. It is recommended to use the 8-bit automatic filling timing mode. The timer can be configured through the microcontroller assistant software. In addition, there is no code for opening the general interrupt in your code, let alone the interrupt handling code.

Metosco

hujj posted on 2019-2-2 19:10 It seems that the host needs to flip the specified port regularly. It is recommended to use the 8-bit automatic filling timing mode. The timer can be configured through the microcontroller assistant software. In addition...

Thank you, I optimized it again today and it is temporarily available. I will continue to work hard. Thank you everyone

Metosco

#include
#include
sbit P1_7=P1^7; void main() { unsigned a=0; TMOD=0x01; TH0=0xE0; TL0=0x18; IT0=0; IT1=0; EA=1; EX0=1; EX1=1; TR0 =1; while(1) { if(TF0) { TF0=0; TH0=0xE0; TL0=0x18; a++; if(a==50) { P1_7=~P1_7; a=0; } } } } void buttom_0() interrupt 0 { _nop_(); _nop_(); _nop_(); _nop_(); if(P3^ 2==0) P0=0xff; } void buttom_1() interrupt 2 { _nop_(); _nop_(); _nop_(); _nop_(); if(P3^3==0) P0=0x00; }

Metosco

The above is only for testing: 1. The timer controls the P1.7 port to flip the output; 2. The P0 port is interrupted by the rising edge of the external interrupt to control P0 to all 1 or 0;

Metosco

However, my code has a while loop. Now it has fewer functions. If it has more functions, can I still use while? Is there a better way to solve the problem of multiple events at the same time?