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Message |
vincent74
Guest
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| pull up pb with PIC12F675 |
 Posted: Thu Apr 21, 2005 10:20 am |
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Hello,
I have a pb with pullups of PIC12F675, on port GPO and GP1. I do this code, but the pull ups are not enable, where is the problem?
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| Code: |
#byte WPU = 0x95 ///< Registre des Weak UP Pullup
#byte OPTION_REG = 0x81 ///< Registre OPTION_REG
VOID main( VOID )
{
// Setup I/O PORTS
set_tris_a( 0b11011111 ); // 0 output, 1 input
/*WPU = 0x03; // pull up for GP0 et GP1
OPTION_REG &= 0x7F; // Enable Pull-ups*/
port_a_pullups(0x03);
for(;;); // GP0 and GP1 are low (nothing is plug on GP0 and GP1)
....
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 21, 2005 12:58 pm |
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| What is your version of the compiler ? |
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vincent74
Guest
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| Posted: Fri Apr 22, 2005 12:16 am |
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answer:
| Code: |
#byte CNCOM = 0x19 ///< Registre CNCOM du comparateur //<<<<<
VOID main( VOID )
{
delay_ms(100);
// Setup I/O PORTS
set_tris_a( 0b11011111 ); // 0 output, 1 input
CNCOM = 0x07; // config of comparator pin....//<<<<<<<<<<<<<
port_a_pullups(0x03);
// pull ups OK
....
} |
Sorry, I should read the datasheet before start programming. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Apr 22, 2005 1:13 am |
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That's why I asked what was your version of the compiler.
In PCM vs. 3.222, the start-up code inserted by the compiler
correctly turns off the comparators. I suspected that your
version did not, but wanted to confirm it.
This is the start-up code produced by vs. 3.222:
| Code: |
0000 00219 ..... void main()
0000 00220 ........... {
0019 0184 00221 CLRF 04
001A 301F 00222 MOVLW 1F
001B 0583 00223 ANDWF 03,F
001C 131F 00224 BCF 1F.6
001D 1683 00225 BSF 03.5
001E 101F 00226 BCF 1F.0
001F 109F 00227 BCF 1F.1
0020 111F 00228 BCF 1F.2
0021 119F 00229 BCF 1F.3
0022 3007 00230 MOVLW 07 // W = 7
0023 1283 00231 BCF 03.5 // Bank 0
0024 0099 00232 MOVWF 19 // Set CMCON = 7
0025 1683 00233 BSF 03.5
0026 0805 00234 MOVF 05,W
0027 1283 00235 BCF 03.5
0028 0819 00236 MOVF 19,W
0029 118C 00237 BCF 0C.3 |
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Guest
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| Posted: Mon Apr 25, 2005 1:01 pm |
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I guess that's why I always try to configure things the way I want it even if I don't have to.
A test program I used for the 12F675.
| Code: | #include "C:\Program Files\PICC\Programs\12F675\test.h"
#BYTE porta = 0x05
void main()
{
setup_adc_ports(0);
setup_adc(ADC_OFF);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
set_tris_a(0x0F);
while(1)
{
porta = 0x00;
delay_ms(1);
porta = 0x30;
delay_cycles(2);
}
} |
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Bilgehan
Joined: 18 Oct 2012
Posts: 1
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| Config Pull up problem |
| Posted: Thu Oct 18, 2012 7:36 am |
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Dear all,
I have been working on PIC 12F675 and want to use internal pull ups. GP0, GP1 and GP2.
But I could not get success,
Is it ok only use port_a_pullups(0bxxxxxx); command to make a config?
How can I canfig, the internal pull ups.
It works with assembly code.
Or what?
MY CODES
| Code: |
.
.
.
void main()
{
set_tris_a(0b00000111);
port_a_pullups(0b00000111);
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_comparator(NC_NC_NC_NC);
output_a(0x00);
output_high(ROLE);
output_high(LED);
while(1)
{
if(SAGYAT == 1)
{
delay_ms(10);
ONDAKIKA=0;
BIRDAKIKA=0;
output_high(ROLE);
output_high(LED);
delay_ms(100);
}
else if(SAGYAT == 0)
{
delay_ms(10);
ONDAKIKA=0;
BIRDAKIKA=0;
output_low(ROLE);
output_low(LED);
delay_ms(100);
}
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What I want to do:
I have 3 pins and if one of them or both or all or combination of them active or passive, do smth, such open/close relay.
I want to use internel pull ups but could not.
Any idea!
Thanks. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19445
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| Posted: Thu Oct 18, 2012 8:10 am |
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#use fast_io(a)
By default the compiler is set to 'standard_io' mode.
In standard_io mode, the instruction:
output_a(0x00);
sets the _whole_ of portA as outputs.
Two choices. Either switch to fast_io mode, _or_ change the order of the instructions.
Just use:
| Code: |
output_a(0x00);
set_tris_a(0b00000111);
port_a_pullups(0b00000111);
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This way, you pre-load the output latch with '0', and only then set the TRIS, which then doesn't get changed on the low bits, provided you only use the bit I/O instructions (output_high and output_low).
Best Wishes |
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