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Grkan13
Joined: 06 Apr 2011
Posts: 14
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| PIC18f4550 and USB interrupt |
 Posted: Mon Apr 30, 2012 1:10 pm |
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Hello,
I'm trying to control a level mechanism via USB and buttons. My system is working great with buttons. There are 10 buttons to go each level. And I want to control the system from computer too.
When you press a button, its firing an interrupt from B port. I want to use USB interrupt on same way. Is it possible?
My interrupt code for buttons is at below
| Code: |
#int_RB
void RB_isr()
{
disable_interrupts(INT_RB);
delay_ms(10);
if(input_State(pin_b4)==0)
{
go=1;
button_pressed=1;
set_adc_channel(0);
delay_ms(50);
level_adc = read_adc();
if(level_adc<=50)
{
button_10_pressed=1;
level=10;
}
else if(level_adc<=200)
{
button_9_pressed=1;
level=9;
}
else if(level_adc<=300)
{
button_8_pressed=1;
level=8;
}
else if(level_adc<=400)
{
button_7_pressed=1;
level=7;
}
else if(level_adc<=500)
{
button_6_pressed=1;
level=6;
}
else if(level_adc<=600)
{
button_5_pressed=1;
level=5;;
}
else if(level_adc<=700)
{
button_4_pressed=1;
level=4;
}
else if(level_adc<=800)
{
button_3_pressed=1;
level=3;
}
else if(level_adc<=900)
{
button_2_pressed=1;
level=2;
}
else if(level_adc<=1200)
{
button_1_pressed=1;
level=1;
}
}
enable_interrupts(INT_RB);
} |
so what i want is, when i get the data from usb, an interrupt should be fired.
now i'm using below driver files.
| Code: |
#include <pic18_usb.h>
#include <USB_configuration.h>
#include <usb.c>
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It's my 1st USB try. I'm not so sure about these driver files. I've found these ones from one of the open-source project. Do I have to use all of these ones?
When I've checked those driver files. pic18_usb.h has those lines:
| Code: | #int_usb
void usb_isr() {
if (usb_state==USB_STATE_DETACHED) return; //should never happen, though
if (UIR) {
debug_usb(debug_putc,"\r\n\n[%X] ",UIR);
if (UIR_ACTV && UIE_ACTV) {usb_isr_activity();} //activity detected. (only enable after sleep)
if (UCON_SUSPND) return;
if (UIR_UERR && UIE_UERR) {usb_isr_uerr();} //error has been detected
if (UIR_URST && UIE_URST) {usb_isr_rst();} //usb reset has been detected
if (UIR_IDLE && UIE_IDLE) {usb_isr_uidle();} //idle time, we can go to sleep
if (UIR_SOF && UIE_SOF) {usb_isr_sof();}
if (UIR_STALL && UIE_STALL) {usb_isr_stall();} //a stall handshake was sent
if (UIR_TRN && UIE_TRN) {
usb_isr_tok_dne();
UIR_TRN=0; // clear the token done interrupt., 0x190.3
} //a token has been detected (majority of isrs)
}
}
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If I add the int_USB to the my main file. does it make any problem?
Thank you. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19365
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| Posted: Mon Apr 30, 2012 2:08 pm |
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You are looking the wrong way at this.
USB, is transferring 'data' all the time when a device is connected. There are configuration packets, polling packets, etc. etc.. You cannot use the USB interrupt to find out if data you want has arrived.
You need to _poll_ for data being available, and let the usb code handle the interrupts for you. Simplest to just use the usb_cdc drivers, and just call usb_kbhit, which will return 'true' when data has arrived.
Also, your serial code is foul. First, there is no point in disabling the INT_RB in the interrupt handler, and second you are delaying in an interrupt, which potentially means missing characters. If you did this in anything associated with USB, you _would_ lose connection.
Best Wishes |
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Grkan13
Joined: 06 Apr 2011
Posts: 14
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| Posted: Wed May 02, 2012 8:33 am |
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Thank you Ttelmah, I understand what you mean about USB, now I'm checking it whenever I need but I have a problem at one section.
| Code: |
while(input_state(s7)==1)
{
output_high(level5);
delay_ms(200);
output_low(level5);
delay_ms(200);
if(button_pressed==1)
{
adc_button();
output_low(level5);
optic_middle();
if(button_5_pressed==1)
{
optic_up();
go=0;
goto end;
}
else
goto start;
}
if (usb_kbhit(1))
{
usb_get_packet(1, received_packet, 4);
if(received_packet[1]==0b00100000)
{
optic_up();
go=0;
goto end;
}
}
} |
At above part, software is waiting for 3 response; sensor, button or usb. and while waiting it needs to blink LED. When I try to get data from USB, its not working. But when I spam the button from PC or when I remove the blinking delays, its working fine. How can i solve this?
By the way thanks for INT_RB warnings. I've removed the a-d conversion out of interrupt, So there is no delay inside of isr now. |
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