Post by thread:Re: [PIC]: Analog Conversion Done Interrupt with C

Hello, I'm using the CCS C compiler and am having trouble getting a #int_ad interrupt to fire. I am using the following code: void main( ) { puts( "Hello!"); enable_interrupts(GLOBAL); enable_interrupts(INT_ADC); enable_interrupts(ADC_DONE); set_adc_channel(0); while (1); } #INT_AD void Analog_Handler() { puts ( " In Analog Handler! " ); } Note: I am enabling serial communication and do recieve "Hello!". Does anyone have any experience with CCS and interrupts? Donovan -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I posted the wrong code below... here is the correct code: #INT_AD void Analog_Handler() { puts ( " In Analog Handler! " ); } void main( ) { puts( "Hello!"); enable_interrupts(GLOBAL); enable_interrupts(INT_ADC); enable_interrupts(ADC_DONE); setup_adc(ADC_CLOCK_DIV_32); setup_adc_ports(ALL_ANALOG); set_adc_channel(0); while (1); } Thanks for any help. {Quote hidden}> Hello, > > I'm using the CCS C compiler and am having trouble getting a #int_ad > interrupt to fire. I am using the following code: > > void main( ) > { > puts( "Hello!"); > enable_interrupts(GLOBAL); > enable_interrupts(INT_ADC); > enable_interrupts(ADC_DONE); > set_adc_channel(0); > while (1); > } > > #INT_AD void Analog_Handler() > { > puts ( " In Analog Handler! " ); > } > > Note: I am enabling serial communication and do recieve "Hello!". > > Does anyone have any experience with CCS and interrupts? > > Donovan > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hi, you obviously did not start the A/D conversion itself by means of ... = read_adc() I hope this helps. Regards, Imre On Sun, 27 May 2001, Donovan Parks wrote: {Quote hidden}> I posted the wrong code below... here is the correct code: > > #INT_AD void Analog_Handler() > { > puts ( " In Analog Handler! " ); > } > > void main( ) > { > puts( "Hello!"); > enable_interrupts(GLOBAL); > enable_interrupts(INT_ADC); > enable_interrupts(ADC_DONE); > setup_adc(ADC_CLOCK_DIV_32); > setup_adc_ports(ALL_ANALOG); > set_adc_channel(0); > while (1); > } > > Thanks for any help. > > > > Hello, > > > > I'm using the CCS C compiler and am having trouble getting a #int_ad > > interrupt to fire. I am using the following code: > > > > void main( ) > > { > > puts( "Hello!"); > > enable_interrupts(GLOBAL); > > enable_interrupts(INT_ADC); > > enable_interrupts(ADC_DONE); > > set_adc_channel(0); > > while (1); > > } > > > > #INT_AD void Analog_Handler() > > { > > puts ( " In Analog Handler! " ); > > } > > > > Note: I am enabling serial communication and do recieve "Hello!". > > > > Does anyone have any experience with CCS and interrupts? > > > > Donovan > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hello, I see... I though one had to set the channel and then wait for a int_adc interrupt that would let you know the data is ready. How long to I have to wait between calling set_adc_channel( ) and read_adc( ) (or does CCS handle this)? Thanks {Quote hidden}> Hi, > > you obviously did not start the A/D conversion itself by means of > > ... = read_adc() > > I hope this helps. > > Regards, > Imre > > > On Sun, 27 May 2001, Donovan Parks wrote: > > > I posted the wrong code below... here is the correct code: > > > > #INT_AD void Analog_Handler() > > { > > puts ( " In Analog Handler! " ); > > } > > > > void main( ) > > { > > puts( "Hello!"); > > enable_interrupts(GLOBAL); > > enable_interrupts(INT_ADC); > > enable_interrupts(ADC_DONE); > > setup_adc(ADC_CLOCK_DIV_32); > > setup_adc_ports(ALL_ANALOG); > > set_adc_channel(0); > > while (1); > > } > > > > Thanks for any help. > > > > > > > Hello, > > > > > > I'm using the CCS C compiler and am having trouble getting a #int_ad > > > interrupt to fire. I am using the following code: > > > > > > void main( ) > > > { > > > puts( "Hello!"); > > > enable_interrupts(GLOBAL); > > > enable_interrupts(INT_ADC); > > > enable_interrupts(ADC_DONE); > > > set_adc_channel(0); > > > while (1); > > > } > > > > > > #INT_AD void Analog_Handler() > > > { > > > puts ( " In Analog Handler! " ); > > > } > > > > > > Note: I am enabling serial communication and do recieve "Hello!". > > > > > > Does anyone have any experience with CCS and interrupts? > > > > > > Donovan > > > > > > -- > > > http://www.piclist.com hint: The list server can filter out subtopics > > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > > > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Donovan, Caveat: Untested code follows, I have never used the interrupt for A/D stuff. Nothing I have done so far is so pressed for time it can't handle waiting for a conversion to finish. I just use read_adc(). That function sets the GO/!DONE bit, waits for it to clear, then returns the ADC result. Having said that... On Sun, 27 May 2001, Donovan Parks wrote: > I posted the wrong code below... here is the correct code: > > #INT_AD void Analog_Handler() > { > puts ( " In Analog Handler! " ); > } Looks straightforward enough. > void main( ) > { > puts( "Hello!"); > enable_interrupts(GLOBAL); > enable_interrupts(INT_ADC); My helpfile lists INT_AD but not INT_ADC... > enable_interrupts(ADC_DONE); And I don't see this listed at all... > setup_adc(ADC_CLOCK_DIV_32); > setup_adc_ports(ALL_ANALOG); > set_adc_channel(0); > while (1); > } I looked at the asm code generated by set_adc_channel(0). All it does is set the channel select bits in ADCON, it doesn't start a conversion. This would explain why you never get an interrupt. here's what I think you may need to try, assuming you just can't wait for read_adc() to do its thing: #define ADCON 0x1f if(!bit_test(ADCON,2)) bit_set(ADCON,2); This will start the conversion if there's not one going already, and you should see an interrupt when it's done. In another reply you say: >I see... I though one had to set the channel and then wait for a int_adc >interrupt that would let you know the data is ready. How long to I have >to wait between calling set_adc_channel( ) and read_adc( ) (or does CCS >handle this)? If you want to use interrupt driven analog you don't want to use read_adc(), since as noted above it waits for the conversion to start. You need to wait the acquisition time after issuing the set_adc_channel() call, which looks to be around 20usec. I usually don't worry about it since I do the set_adc_chanel in the initialization phase and don't use read_Adc() until later on. To be really safe you could do a delay_us(20) after selecti gthe channel. > Thanks for any help. I hope this qualifies as help... 8-) Dale -- A train stops at a train station. A bus stops at a bus station. On my desk I have a workstation... -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hi, 2 usec as sampling time. Imre On Sun, 27 May 2001, Donovan Parks wrote: {Quote hidden}> Hello, > > I see... I though one had to set the channel and then wait for a int_adc > interrupt that would let you know the data is ready. How long to I have to > wait between calling set_adc_channel( ) and read_adc( ) (or does CCS handle > this)? > > Thanks > > > > Hi, > > > > you obviously did not start the A/D conversion itself by means of > > > > ... = read_adc() > > > > I hope this helps. > > > > Regards, > > Imre > > > > > > On Sun, 27 May 2001, Donovan Parks wrote: > > > > > I posted the wrong code below... here is the correct code: > > > > > > #INT_AD void Analog_Handler() > > > { > > > puts ( " In Analog Handler! " ); > > > } > > > > > > void main( ) > > > { > > > puts( "Hello!"); > > > enable_interrupts(GLOBAL); > > > enable_interrupts(INT_ADC); > > > enable_interrupts(ADC_DONE); > > > setup_adc(ADC_CLOCK_DIV_32); > > > setup_adc_ports(ALL_ANALOG); > > > set_adc_channel(0); > > > while (1); > > > } > > > > > > Thanks for any help. > > > > > > > > > > Hello, > > > > > > > > I'm using the CCS C compiler and am having trouble getting a #int_ad > > > > interrupt to fire. I am using the following code: > > > > > > > > void main( ) > > > > { > > > > puts( "Hello!"); > > > > enable_interrupts(GLOBAL); > > > > enable_interrupts(INT_ADC); > > > > enable_interrupts(ADC_DONE); > > > > set_adc_channel(0); > > > > while (1); > > > > } > > > > > > > > #INT_AD void Analog_Handler() > > > > { > > > > puts ( " In Analog Handler! " ); > > > > } > > > > > > > > Note: I am enabling serial communication and do recieve "Hello!". > > > > > > > > Does anyone have any experience with CCS and interrupts? > > > > > > > > Donovan > > > > > > > > -- > > > > http://www.piclist.com hint: The list server can filter out subtopics > > > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > > > > > > > > > > > -- > > > http://www.piclist.com hint: The list server can filter out subtopics > > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > > > > > > > > > -- > > http://www.piclist.com hint: The list server can filter out subtopics > > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > > > > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.