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colesha
Joined: 09 Jan 2012
Posts: 48
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 Posted: Thu Aug 13, 2020 2:06 pm |
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| PCM programmer wrote: | You still didn't completely state your goal, so I'll do it:
1. If you push button A3 momentarily, the LED will go on.
2. If you push and hold button A2 for 5 seconds continuously, then the LED
will go off.
If that's not it, then say so. |
Yes, that is what the code i currently posted do exactly, but it is not my final goal.
Let me state my final goal below:
The code shall be used to enter the menu screen on LCD (am first testing it as an LED in this case).
| Quote: | 2. If you push and hold button A2 for 5 seconds continuously, then the LED
will go off. |
This is the only action i want to execute, i don't need button A3
Overall goal to be put in the final project is:
1. If you push and hold the menu button (button A2) for 5 seconds continuously, the menu or settings menu shall be displayed on the LCD so that you can input the desired system settings, then exit the menu when your done.
2. If you push the menu button (button A2) momentarily, the menu/settings screen shall not be displayed on the LCD, only the LCD back-light shall be turned on for 30s so that you can clearly read what is on the LCD (maybe during night time), then the back-light will be turned off.
So i don't need button A3.
Hope it is quite better now. |
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colesha
Joined: 09 Jan 2012
Posts: 48
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| Posted: Wed Dec 09, 2020 9:40 am |
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| PCM programmer wrote: | | colesha wrote: |
How can i best handle it? |
Here is one way to do it. In this program, the isr runs all the time.
It can be re-written so the isr only runs when needed.
In the program below, you turn on the LED by calling the turn_on_led()
function with the desired run time in seconds. The isr counts off the
number of seconds and then turns off the LED.
I think you are using a 16F887. I don't have a working one so I used a
16F877 instead. Test program:
| Code: | #include<16F877.h>
#fuses HS, NOWDT, PUT, BROWNOUT, NOLVP
#use delay(clock=20M)
#use rs232(baud=9600, UART1, ERRORS)
#define INTS_PER_SECOND 76
#define LED_PIN PIN_B0
int8 led_seconds_timer = 0;
//--------------------------
#INT_TIMER0
void t0_isr(void)
{
static int8 int_count = INTS_PER_SECOND;
int_count--;
if(int_count == 0) // Has 1 second passed ?
{
int_count = INTS_PER_SECOND; // If so, reload counter
if(led_seconds_timer) // Is the LED timer running ?
{
led_seconds_timer--; // If so, decrement it
if(led_seconds_timer == 0) // Is it done ?
{
output_low(LED_PIN); // If so, turn off the LED
}
}
}
}
//--------------------------------
// This function turns on the LED and sets the
// number of seconds that it will stay on.
void turn_on_led(int8 seconds)
{
output_high(LED_PIN); // Turn on the LED
led_seconds_timer = seconds; // Start the LED timer
}
//======================
void main()
{
output_low(LED_PIN); // LED is initially off
setup_timer_0(T0_INTERNAL | T0_DIV_256);
set_timer0(0);
clear_interrupt(INT_TIMER0);
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);
turn_on_led(5); // Run LED for 5 seconds
while(TRUE);
} |
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Hello PCM Programmer,
How can i get this code work with 18f4550?
Its not compiling
thanks. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Dec 09, 2020 10:00 am |
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It compiles OK for me. I changed the #include line for the PIC to use
18F4550.h and got this result:
| Quote: |
Compiling C:\Program Files\...\PCH_Test on 09-Dec-20 at 08:00
Memory usage: ROM=1% RAM=1% - 1%
0 Errors, 0 Warnings.
Build Successful.
Loaded C:\Program Files\...\PCH_Test.cof.
BUILD SUCCEEDED: Wed Dec 09 08:00:31 2020
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colesha
Joined: 09 Jan 2012
Posts: 48
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| Posted: Wed Dec 09, 2020 10:20 am |
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| PCM programmer wrote: | It compiles OK for me. I changed the #include line for the PIC to use
18F4550.h and got this result:
| Quote: |
Compiling C:\Program Files\...\PCH_Test on 09-Dec-20 at 08:00
Memory usage: ROM=1% RAM=1% - 1%
0 Errors, 0 Warnings.
Build Successful.
Loaded C:\Program Files\...\PCH_Test.cof.
BUILD SUCCEEDED: Wed Dec 09 08:00:31 2020
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It compiled, thanks.
However, the timer doesn't seem to be working as expected. Instead of the led comes on for 5 seconds, its on permanently.
Can you assist with it, please? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Dec 09, 2020 10:51 am |
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Change the following line so it adds the parameter shown in bold below:
| Quote: | | setup_timer_0(T0_INTERNAL | T0_DIV_256 | T0_8_BIT); |
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colesha
Joined: 09 Jan 2012
Posts: 48
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| Posted: Wed Dec 09, 2020 11:04 am |
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Thanks, PCM,
It has worked. |
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