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Discussion Groups | MSP430 | ADC Conversions type
The purpose of this group is to foster exchange of information on the Texas Instruments MSP430 family of microcontrollers and related tools. Everyone welcome, all levels of familiarity/expertise.
ADC Conversions type - Technical Kripa - Jul 10 5:43:52 2009
What is the difference between "sequence of conversions" and "single conversion" for ADC
in MSP430??
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Real-world software for real-time control. Details Here!
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Re: ADC Conversions type - balagangadharan_raja1122 - Jul 10 22:59:16 2009
Single conversion - ADC conversion for only one channel which is activated/selected.
sequence of conversions - ADC conversion for number of channel which is activated.
Regards
B.Bala
--- In m...@yahoogroups.com, Technical Kripa wrote:
>
> What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads.yahoo.com/in/internetexplorer/
>
> [Non-text portions of this message have been removed]
>
------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
sequence of conversions - ADC conversion for number of channel which is activated.
Regards
B.Bala
--- In m...@yahoogroups.com, Technical Kripa
>
> What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads.yahoo.com/in/internetexplorer/
>
> [Non-text portions of this message have been removed]
>
------------------------------------
______________________________
controlSUITE™ software. Comprehensive. Intuitive. Optimized.
Real-world software for real-time control. Details Here!
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
Re: ADC Conversions type - tintronic - Jul 12 12:38:56 2009
It depends on which ADC you're referring to: ADC12 or ADC10.
In ADC10 a sequence starts on the current channel. Each following conversion is done on the previous channel until channel A0 is reached.
In ADC12, the sequense starts on the selected MCTL (conversion control memory register, not channel), and moves forward until a MCTL with EOS (End of Sequence) is found.
But you should have gotten this from reading the User Guide. Did you read it?
Michael K.
--- In m...@yahoogroups.com, "balagangadharan_raja1122"
wrote:
>
> Single conversion - ADC conversion for only one channel which is activated/selected.
>
> sequence of conversions - ADC conversion for number of channel which is activated.
> Regards
> B.Bala
>
> --- In m...@yahoogroups.com, Technical Kripa wrote:
> >
> > What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> >
> >
> > Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads.yahoo.com/in/internetexplorer/
> >
> > [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
In ADC10 a sequence starts on the current channel. Each following conversion is done on the previous channel until channel A0 is reached.
In ADC12, the sequense starts on the selected MCTL (conversion control memory register, not channel), and moves forward until a MCTL with EOS (End of Sequence) is found.
But you should have gotten this from reading the User Guide. Did you read it?
Michael K.
--- In m...@yahoogroups.com, "balagangadharan_raja1122"
>
> Single conversion - ADC conversion for only one channel which is activated/selected.
>
> sequence of conversions - ADC conversion for number of channel which is activated.
> Regards
> B.Bala
>
> --- In m...@yahoogroups.com, Technical Kripa
> >
> > What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> >
> >
> > Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads.yahoo.com/in/internetexplorer/
> >
> > [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
Re: Re: ADC Conversions type - Technical Kripa - Jul 13 0:16:59 2009
Thanks..!
what about single conversion and repeated conversion...?
--- On Sat, 11/7/09, balagangadharan_raja1122 wrote:
From: balagangadharan_raja1122
Subject: [msp430] Re: ADC Conversions type
To: m...@yahoogroups.com
Date: Saturday, 11 July, 2009, 2:58 AM
Single conversion - ADC conversion for only one channel which is activated/selected.
sequence of conversions - ADC conversion for number of channel which is activated.
Regards
B.Bala
--- In msp430@yahoogroups. com, Technical Kripa wrote:
>
> What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads. yahoo.com/ in/internetexplo rer/
>
> [Non-text portions of this message have been removed]
>
Love Cricket? Check out live scores, photos, video highlights and more. Click here http://cricket.yahoo.com
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
what about single conversion and repeated conversion...?
--- On Sat, 11/7/09, balagangadharan_raja1122
From: balagangadharan_raja1122
Subject: [msp430] Re: ADC Conversions type
To: m...@yahoogroups.com
Date: Saturday, 11 July, 2009, 2:58 AM
Single conversion - ADC conversion for only one channel which is activated/selected.
sequence of conversions - ADC conversion for number of channel which is activated.
Regards
B.Bala
--- In msp430@yahoogroups. com, Technical Kripa
>
> What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads. yahoo.com/ in/internetexplo rer/
>
> [Non-text portions of this message have been removed]
>
Love Cricket? Check out live scores, photos, video highlights and more. Click here http://cricket.yahoo.com
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
Re: ADC Conversions type - balagangadharan_raja1122 - Jul 13 1:02:36 2009
Single conversion - A single is sampled and converted once.
example:
#include
static unsigned int results; // Needs to be global in this example
// Otherwise, the compiler removes it
// because it is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+SHT0_15; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP; // Use sampling timer, set mode
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ENC; // Enable conversions
while(1)
{
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
results = ADC12MEM0; // Move results, IFG is cleared
_BIC_SR_IRQ(LPM0_bits); // Clear LPM0, SET BREAKPOINT HERE
}
Repeated Conversion - A single channel is sampled and converted continuously.
example:
#include
#define Num_of_Results 8 // number of repeat = 8
static unsigned int results[Num_of_Results]; // Needs to be global in this
// example. Otherwise, the
// compiler removes it because it
// is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+SHT0_8+MSC; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP+CONSEQ_2; // Use sampling timer, set mode
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0,Enable interrupts
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
static unsigned int index = 0;
results[index] = ADC12MEM0; // Move results
index = (index+1)%Num_of_Results; // Increment results index, modulo
}
sequence conversion - A sequence of channels is sampled and converted once.
example:
#include
static unsigned int results[4]; // Needs to be global in this example
// Otherwise, the compiler removes it
// because it is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL = 0x0F; // Enable A/D channel inputs
ADC12CTL0 = ADC12ON+MSC+SHT0_2; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP+CONSEQ_1; // Use sampling timer, single sequence
ADC12MCTL0 = INCH_0; // ref+=AVcc, channel = A0
ADC12MCTL1 = INCH_1; // ref+=AVcc, channel = A1
ADC12MCTL2 = INCH_2; // ref+=AVcc, channel = A2
ADC12MCTL3 = INCH_3+EOS; // ref+=AVcc, channel = A3, end seq.
ADC12IE = 0x08; // Enable ADC12IFG.3
ADC12CTL0 |= ENC; // Enable conversions
while(1)
{
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
results[0] = ADC12MEM0; // Move results, IFG is cleared
results[1] = ADC12MEM1; // Move results, IFG is cleared
results[2] = ADC12MEM2; // Move results, IFG is cleared
results[3] = ADC12MEM3; // Move results, IFG is cleared
_BIC_SR_IRQ(LPM0_bits); // Clear LPM0, SET BREAKPOINT HERE
}
Repeat sequence of conversion:
A sequence of channels is sampled and converted repeatedly
#include
#define Num_of_Results 8
static unsigned int A0results[Num_of_Results]; // These need to be global in
static unsigned int A1results[Num_of_Results]; // this example. Otherwise, the
static unsigned int A2results[Num_of_Results]; // compiler removes them because
static unsigned int A3results[Num_of_Results]; // they are not used
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL = 0x0F; // Enable A/D channel inputs
ADC12CTL0 = ADC12ON+MSC+SHT0_8; // Turn on ADC12, extend sampling time
// to avoid overflow of results
ADC12CTL1 = SHP+CONSEQ_3; // Use sampling timer, repeated sequence
ADC12MCTL0 = INCH_0; // ref+=AVcc, channel = A0
ADC12MCTL1 = INCH_1; // ref+=AVcc, channel = A1
ADC12MCTL2 = INCH_2; // ref+=AVcc, channel = A2
ADC12MCTL3 = INCH_3+EOS; // ref+=AVcc, channel = A3, end seq.
ADC12IE = 0x08; // Enable ADC12IFG.3
ADC12CTL0 |= ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
static unsigned int index = 0;
A0results[index] = ADC12MEM0; // Move A0 results, IFG is cleared
A1results[index] = ADC12MEM1; // Move A1 results, IFG is cleared
A2results[index] = ADC12MEM2; // Move A2 results, IFG is cleared
A3results[index] = ADC12MEM3; // Move A3 results, IFG is cleared
index = (index+1)%Num_of_Results; // Increment results index, modulo; Set Breakpoint here
}
All the programs are tested in Both TI CCE and IAR Workbench complier.
Further detail please visit to TI for example related to your chip
http://focus.ti.com/mcu/docs/mcuflashtools.tsp?sectionId=95&tabId=1538&familyId=342
Regards
Bala B
--- In m...@yahoogroups.com, Technical Kripa wrote:
>
> Thanks..!
> what about single conversion and repeated conversion...?
>
> --- On Sat, 11/7/09, balagangadharan_raja1122 wrote:
> From: balagangadharan_raja1122
> Subject: [msp430] Re: ADC Conversions type
> To: m...@yahoogroups.com
> Date: Saturday, 11 July, 2009, 2:58 AM
> Single conversion - ADC conversion for only one channel which is activated/selected.
>
> sequence of conversions - ADC conversion for number of channel which is activated.
>
> Regards
> B.Bala
>
> --- In msp430@yahoogroups. com, Technical Kripa wrote:
> >
> > What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> >
> >
> > Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads. yahoo.com/ in/internetexplo rer/
> >
> > [Non-text portions of this message have been removed]
> > Love Cricket? Check out live scores, photos, video highlights and more. Click here http://cricket.yahoo.com
>
> [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )
example:
#include
static unsigned int results; // Needs to be global in this example
// Otherwise, the compiler removes it
// because it is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+SHT0_15; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP; // Use sampling timer, set mode
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ENC; // Enable conversions
while(1)
{
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
results = ADC12MEM0; // Move results, IFG is cleared
_BIC_SR_IRQ(LPM0_bits); // Clear LPM0, SET BREAKPOINT HERE
}
Repeated Conversion - A single channel is sampled and converted continuously.
example:
#include
#define Num_of_Results 8 // number of repeat = 8
static unsigned int results[Num_of_Results]; // Needs to be global in this
// example. Otherwise, the
// compiler removes it because it
// is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL |= 0x01; // Enable A/D channel A0
ADC12CTL0 = ADC12ON+SHT0_8+MSC; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP+CONSEQ_2; // Use sampling timer, set mode
ADC12IE = 0x01; // Enable ADC12IFG.0
ADC12CTL0 |= ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0,Enable interrupts
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
static unsigned int index = 0;
results[index] = ADC12MEM0; // Move results
index = (index+1)%Num_of_Results; // Increment results index, modulo
}
sequence conversion - A sequence of channels is sampled and converted once.
example:
#include
static unsigned int results[4]; // Needs to be global in this example
// Otherwise, the compiler removes it
// because it is not used for anything.
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL = 0x0F; // Enable A/D channel inputs
ADC12CTL0 = ADC12ON+MSC+SHT0_2; // Turn on ADC12, set sampling time
ADC12CTL1 = SHP+CONSEQ_1; // Use sampling timer, single sequence
ADC12MCTL0 = INCH_0; // ref+=AVcc, channel = A0
ADC12MCTL1 = INCH_1; // ref+=AVcc, channel = A1
ADC12MCTL2 = INCH_2; // ref+=AVcc, channel = A2
ADC12MCTL3 = INCH_3+EOS; // ref+=AVcc, channel = A3, end seq.
ADC12IE = 0x08; // Enable ADC12IFG.3
ADC12CTL0 |= ENC; // Enable conversions
while(1)
{
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
results[0] = ADC12MEM0; // Move results, IFG is cleared
results[1] = ADC12MEM1; // Move results, IFG is cleared
results[2] = ADC12MEM2; // Move results, IFG is cleared
results[3] = ADC12MEM3; // Move results, IFG is cleared
_BIC_SR_IRQ(LPM0_bits); // Clear LPM0, SET BREAKPOINT HERE
}
Repeat sequence of conversion:
A sequence of channels is sampled and converted repeatedly
#include
#define Num_of_Results 8
static unsigned int A0results[Num_of_Results]; // These need to be global in
static unsigned int A1results[Num_of_Results]; // this example. Otherwise, the
static unsigned int A2results[Num_of_Results]; // compiler removes them because
static unsigned int A3results[Num_of_Results]; // they are not used
void main(void)
{
WDTCTL = WDTPW+WDTHOLD; // Stop watchdog timer
P6SEL = 0x0F; // Enable A/D channel inputs
ADC12CTL0 = ADC12ON+MSC+SHT0_8; // Turn on ADC12, extend sampling time
// to avoid overflow of results
ADC12CTL1 = SHP+CONSEQ_3; // Use sampling timer, repeated sequence
ADC12MCTL0 = INCH_0; // ref+=AVcc, channel = A0
ADC12MCTL1 = INCH_1; // ref+=AVcc, channel = A1
ADC12MCTL2 = INCH_2; // ref+=AVcc, channel = A2
ADC12MCTL3 = INCH_3+EOS; // ref+=AVcc, channel = A3, end seq.
ADC12IE = 0x08; // Enable ADC12IFG.3
ADC12CTL0 |= ENC; // Enable conversions
ADC12CTL0 |= ADC12SC; // Start conversion
_BIS_SR(LPM0_bits + GIE); // Enter LPM0, Enable interrupts
}
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
static unsigned int index = 0;
A0results[index] = ADC12MEM0; // Move A0 results, IFG is cleared
A1results[index] = ADC12MEM1; // Move A1 results, IFG is cleared
A2results[index] = ADC12MEM2; // Move A2 results, IFG is cleared
A3results[index] = ADC12MEM3; // Move A3 results, IFG is cleared
index = (index+1)%Num_of_Results; // Increment results index, modulo; Set Breakpoint here
}
All the programs are tested in Both TI CCE and IAR Workbench complier.
Further detail please visit to TI for example related to your chip
http://focus.ti.com/mcu/docs/mcuflashtools.tsp?sectionId=95&tabId=1538&familyId=342
Regards
Bala B
--- In m...@yahoogroups.com, Technical Kripa
>
> Thanks..!
> what about single conversion and repeated conversion...?
>
> --- On Sat, 11/7/09, balagangadharan_raja1122
> From: balagangadharan_raja1122
> Subject: [msp430] Re: ADC Conversions type
> To: m...@yahoogroups.com
> Date: Saturday, 11 July, 2009, 2:58 AM
> Single conversion - ADC conversion for only one channel which is activated/selected.
>
> sequence of conversions - ADC conversion for number of channel which is activated.
>
> Regards
> B.Bala
>
> --- In msp430@yahoogroups. com, Technical Kripa
> >
> > What is the difference between "sequence of conversions" and "single conversion" for ADC in MSP430??
> >
> >
> > Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8. http://downloads. yahoo.com/ in/internetexplo rer/
> >
> > [Non-text portions of this message have been removed]
> > Love Cricket? Check out live scores, photos, video highlights and more. Click here http://cricket.yahoo.com
>
> [Non-text portions of this message have been removed]
>
------------------------------------
(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )