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richi-d
Joined: 28 Aug 2007
Posts: 106
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| PIC24 A/D don´t work |
 Posted: Wed Apr 15, 2009 11:23 am |
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This is my code:
| Code: | int16 LED_SPG;
SETUP_ADC_PORTS(VSS_VDD | sAN3 );
SET_ADC_CHANNEL(3);
SETUP_ADC(ADC_CLOCK_INTERNAL | ADC_TAD_MUL_31);
delay_us(100);
LED_SPG = READ_ADC(); |
All registers seems to be right from CCS, but READ_ADC brings: 0xFFC0 in the watch window. In the ADC1BUF0 the value is 0x1023 (also incorrect!)
Whats wrong? |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Wed Apr 15, 2009 12:15 pm |
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| On some PIC24 devices, some JTAG configurations are incompatible with ADC operation, read the respective device errata sheet. There may be also problems with PCD built-in functions. Generally, PIC24 ADC operation is more complex than with other PIC devices, offering many options for misunderstandings and programming faults. |
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Tom B
Guest
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| Re: PIC24 A/D don´t work |
| Posted: Wed Apr 15, 2009 9:12 pm |
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| richi-d wrote: | This is my code:
| Code: | int16 LED_SPG;
SETUP_ADC_PORTS(VSS_VDD | sAN3 );
SET_ADC_CHANNEL(3);
SETUP_ADC(ADC_CLOCK_INTERNAL | ADC_TAD_MUL_31);
delay_us(100);
LED_SPG = READ_ADC(); |
All registers seems to be right from CCS, but READ_ADC brings: 0xFFC0 in the watch window. In the ADC1BUF0 the value is 0x1023 (also incorrect!)
Whats wrong? |
Add the following to you your .h file
#device ADC=10 |
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richi-d
Joined: 28 Aug 2007
Posts: 106
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| Posted: Sun Jul 05, 2009 4:17 am |
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It works if I use programming port 2. See erata.
Thanks |
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