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eyewonder300
Joined: 09 Jun 2004
Posts: 52
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| Interrupt on change RB0-RB3 |
 Posted: Fri Sep 25, 2015 7:39 am |
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I'm using a PIC 16F887, compiler v4.069
The 'F887 datasheet shows interrupt on change for all bits in Port B, but it looks like the CCS Compiler #int_RB only looks for changes on RB4-RB7.
I would like to interrupt on any RB pin changing. What do I need to do?
Cheers,
Steve |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19447
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| Posted: Fri Sep 25, 2015 8:42 am |
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Just set the required bit in the IOCB register.
The interrupt responds to all pins with bits set in this register.
| Code: |
#define IOCB=getenv("SFR:IOCB")
//then to enable RB3 (say)
bit_set(IOCB,3);
//to enable all
IOCB=0xFF;
//to disable all
IOCB=0;
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eyewonder300
Joined: 09 Jun 2004
Posts: 52
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| Posted: Fri Sep 25, 2015 9:35 am |
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Thanks, I'll try this later today.
Cheers,
Steve |
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eyewonder300
Joined: 09 Jun 2004
Posts: 52
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| Success |
| Posted: Mon Oct 05, 2015 1:22 pm |
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Thanks to all, I have my prog working as needed. Some of the problems were from my fuse selections (or lack thereof), and not understanding the interrupt enabling, & testing.
My hardware is a quadrature encoder chip, and it outputs a low going pulse on one pin for count up, and a low going pulse on another pin for count down. The chip prohibits both from being low at the same time, so whichever (port RB4 or RB5) is low is my count direction. If both are hi, then some other interrupt on the port was active.
Here is the code that worked for me:
| Code: | // This function reads Port B without changing the TRIS.
//int8 input_state_b(void)
// {
// #byte PortB = getenv("SFR:PORTB")
// return(PortB);
// }
#int_RB
void RB_isr(void)
{
current = input_b();
disable_interrupts(global);
if ((!bit_test(current,5))) //LOW signal is COUNT UP pulse from encoder
{
counter_val = counter_val + 1;
printf(vfd_putc,"\fCounter: %3u",counter_val);
}
if ((!bit_test(current,4))) //LOW signal is COUNT DOWN pulse from encoder
{
counter_val = counter_val - 1;
printf(vfd_putc,"\fCounter: %3u",counter_val);
}
}
void main()
{
counter_val = 0;
vfd_init();
vfd_putc("Hello, Steve");
delay_ms(1000);
vfd_putc("\fWaiting for ISR");
delay_ms(1000);
set_tris_b(0x3F);
port_b_pullups(0b00111111);
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);// This device COMP currently not supported by the PICWizard
// enable_interrupts(INT_RB);
enable_interrupts(INT_RB4);
enable_interrupts(INT_RB5);
clear_interrupt(int_rb);
enable_interrupts(GLOBAL);
//Setup_Oscillator parameter not selected from Intr Oscillator Config tab
// TODO: USER CODE!!
while(true){};
}
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