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IBeRyUS
Joined: 27 Nov 2007
Posts: 2
Location: Konya/Turkey
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| Trouble with 12F675 A/D unit |
 Posted: Tue Nov 27, 2007 7:38 pm |
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Hi,
I am using PCWHD 4.057. I had some troubles with 12F675 a few days ago. I corrected it but i couldn't understand why it is happening.
I used PICWizard to create project because I have limited time to it but it take too much time:) this is the code generated by PicWizard and I controlled it more times from help.
I made a project to my school project which is reading analog value in GP2 pin and send it to PC by RS-232. I used A/D interrupt so i am using read_adc(); functions in main() function with this argument ADC_START_ONLY. In the interrupt function I am using read_adc with ADC_READ_ONLY. So i start conversion after send data and wait for int. after int. flag will be seted and checked in main loop. if flag set i send data and start conversion again.
This is .h file which contains my defines.
| Code: | #include <12F675.h>
#device adc=10
#FUSES WDT //No Watch Dog Timer
#FUSES INTRC_IO //Internal RC Osc, no CLKOUT
#FUSES NOCPD //No EE protection
#FUSES NOPROTECT //Code not protected from reading
#FUSES MCLR //Master Clear pin enabled
#FUSES PUT //Power Up Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES BANDGAP_HIGH
#use delay(clock=4000000,restart_wdt)
#use rs232(baud=19200,parity=N,xmit=PIN_A4,rcv=PIN_A5,bits=8,FORCE_SW,restart_wdt)
int1 flag;
union tanim
{
unsigned int16 l;
unsigned int8 c[2];
}deger;
#byte ansel = 0x9f
#byte adcon = 0x1f
#rom 0x3ff={0x3458} |
this is code generated by PicWizard.
| Code: |
setup_adc_ports(sAN2|VSS_VDD);
setup_adc(ADC_CLOCK_INTERNAL);
.....
.....
enable_interrupts(INT_AD);
enable_interrupts(GLOBAL);
//TODO:
set_adc_channel(sAN2);
delay_ms(1);
read_adc(ADC_START_ONLY);
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when i did it and control it in PROTEUS afte read_adc function processed proteus give warning. "The GPIO<0> is not configured as analog input.". I think maybe PROTEUS can't do it so i tested in board I token same values. I read only digital port values and it was only 0x00 or 0x3ff. After some tries i put ansel and adcon defines to my .h file and i deleted all CCS adc functions. I opened 12f675 datasheet and calculated all values to be written to Tris, Adsel and Adcon and i make them like this.
| Code: |
set_tris_a(0x2c);
ansel=0x34;
adcon=0x89;
....
....
read_adc(ADC_START_ONLY);
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after this my simulation and board worked perfectly.
Why happened this and why i could't use CCS's adc functions???
Have you have any idea???
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IBeRyUS was here... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Nov 27, 2007 7:49 pm |
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| Quote: | set_adc_channel(sAN2);
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This is wrong. The parameter for this function is the channel
number, such as 0, 1, 2, 3, etc. It's not the "sANx" number. |
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IBeRyUS
Joined: 27 Nov 2007
Posts: 2
Location: Konya/Turkey
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| thx |
| Posted: Tue Nov 27, 2007 7:55 pm |
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thanx PCM Programmer. Really I couldn't see it.
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