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ADC0 is now working on Teensy 3.1.

simple
Jacob Alexander 10 years ago
parent
9fbffb37e6
commit
c905bfdebf
1 changed files with 26 additions and 8 deletions
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  1. 26
    8
      Scan/ADCTest/scan_loop.c

+ 26
- 8
Scan/ADCTest/scan_loop.c View File

// Scan Module command dictionary // Scan Module command dictionary
char* scanCLIDictName = "ADC Test Module Commands"; char* scanCLIDictName = "ADC Test Module Commands";
CLIDictItem scanCLIDict[] = { CLIDictItem scanCLIDict[] = {
{ "adc", "Read the specified number of values from the ADC.", cliFunc_adc },
{ "adcInit", "Intialize/calibrate ADC. Arg 1 specifies the pin.", cliFunc_adcInit },
#if defined(_mk20dx128_) || defined(_mk20dx256_) // ARM
{ "adc", "Read the specified number of values from the ADC at the given pin: <pin> [# of reads]"
NL "\t\t See \033[35mLib/pin_map.teensy3\033[0m for ADC0 channel number.", cliFunc_adc },
{ "adcInit", "Intialize/calibrate ADC: <ADC Resolution> <Vref> <Hardware averaging samples>"
NL "\t\tADC Resolution -> 8, 10, 12, 16 (bit)"
NL "\t\t Vref -> 0 (1.2 V), 1 (External)"
NL "\t\tHw Avg Samples -> 0 (disabled), 4, 8, 16, 32", cliFunc_adcInit },
#endif
#if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1 #if defined(_mk20dx256_) // DAC is only supported on Teensy 3.1
{ "dac", "Set DAC output value, from 0 to 4095 (1/4096 Vref to Vref).", cliFunc_dac }, { "dac", "Set DAC output value, from 0 to 4095 (1/4096 Vref to Vref).", cliFunc_dac },
{ "dacVref", "Set DAC Vref. 0 is 1.2V. 1 is 3.3V.", cliFunc_dacVref }, { "dacVref", "Set DAC Vref. 0 is 1.2V. 1 is 3.3V.", cliFunc_dacVref },
char* arg1Ptr; char* arg1Ptr;
char* arg2Ptr = args; char* arg2Ptr = args;


print( NL ); // No \n by default after the command is entered

// Parse args until a \0 is found // Parse args until a \0 is found
while ( 1 ) while ( 1 )
{ {
print( NL ); // No \r\n by default after the command is entered

curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list curArgs = arg2Ptr; // Use the previous 2nd arg pointer to separate the next arg from the list
CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr ); CLI_argumentIsolation( curArgs, &arg1Ptr, &arg2Ptr );




// Number of ADC samples to display // Number of ADC samples to display
CLI_argumentIsolation( arg2Ptr, &arg1Ptr, &arg2Ptr ); CLI_argumentIsolation( arg2Ptr, &arg1Ptr, &arg2Ptr );
int displayedADC = decToInt( arg1Ptr );

int displayedADC = 1; // Default to 1 read
if ( arg1Ptr ) // If there is an argument, use that instead
{
displayedADC = decToInt( arg1Ptr );
}


// Poll ADC until it gets a value, making sure to serve interrupts on each attempt // Poll ADC until it gets a value, making sure to serve interrupts on each attempt
while ( displayedADC > 0 ) while ( displayedADC > 0 )
if ( (ADC0_SC1A & ADC_SC1_COCO) ) if ( (ADC0_SC1A & ADC_SC1_COCO) )
{ {
int result = ADC0_RA; int result = ADC0_RA;
print( NL );
printInt32( result ); printInt32( result );
displayedADC--; displayedADC--;

// Prepare for another read
if ( displayedADC > 0 )
{
ADC0_SC1A = channel;
}
} }


__enable_irq(); __enable_irq();
sum = (sum / 2) | 0x8000; sum = (sum / 2) | 0x8000;
ADC0_PG = sum; ADC0_PG = sum;


info_msg("Calibration ADC0_PG (Plus-Side Gain Register) set to: ");
printInt16( sum );
print( NL ); print( NL );
info_msg("Calibration ADC0_PG (Plus-Side Gain Register) set to: ");
printInt16( sum );


// ADC Minus-Side Gain Register // ADC Minus-Side Gain Register
// XXX I don't think this is necessary when doing single-ended (as opposed to differential) -HaaTa // XXX I don't think this is necessary when doing single-ended (as opposed to differential) -HaaTa
sum = (sum / 2) | 0x8000; sum = (sum / 2) | 0x8000;
ADC0_MG = sum; ADC0_MG = sum;


print( NL );
info_msg("Calibration ADC0_MG (Minus-Side Gain Register) set to: "); info_msg("Calibration ADC0_MG (Minus-Side Gain Register) set to: ");
printInt16( sum ); printInt16( sum );
print( NL );
__enable_irq(); // Re-enable interrupts __enable_irq(); // Re-enable interrupts
} }
#endif #endif