Asking about 166Khz sampling rate on ADC12 bit on MSP430F6989

[Lukman 1]

Hello,
Pardon for my direct approach.
I saw an example in Energia forum on Problem Sampling Rate MSP430F5529

May I know what is readADC();? Because you do not create any void called readADC(); on your sample code.

For right now I am trying implement it on MSP430F6989LP, which also has 12bit ADC.
Would you kind share with me?

I appreciate your help.

Thank you very much.

Best Regards,

 

Lukman

your  example code is as below:

 

#if defined(__MSP430_HAS_ADC12_PLUS__)
#define REFV_MAP(x) ((x>>8) & 0x70)
#define REF_MAP(x)  (x & 0xB1)
#define ADCxMEM0 ADC12MEM0 
#define DEFAULT_READ_RESOLUTION 12
#endif

#if defined(__MSP430_HAS_ADC12_PLUS__)
#define DEFAULT      (ADC12SREF_0 << 8)
#define INTERNAL1V5 ((ADC12SREF_1 << 8) | REFON | REFMSTR | REFVSEL_0)
#define INTERNAL2V0 ((ADC12SREF_1 << 8) | REFON | REFMSTR | REFVSEL_1)
#define INTERNAL2V5 ((ADC12SREF_1 << 8) | REFON | REFMSTR | REFVSEL_2)
#define EXTERNAL     (ADC12SREF_2 << 8)#endifuint16_t analog_reference = DEFAULT;
#define NUM_READS 10000

void setup() 
 {  
     Serial.begin(115200);  Serial.println("Setup done");  
     setupADC(A0);
 }
 uint32_t mark, time_it_took;
 uint16_t i;
 void loop() 
 {
     //  Serial.println(readADC());  
     mark = millis();  
     for(i = 0; i < NUM_READS; i++) 
     {   
       readADC();  
     }  
     Serial.print("Time: ");  
     Serial.println(millis() - mark);  
     Serial.println(readADC());
 }
 uint16_t setupADC(uint8_t pin) 
 {  
 uint8_t channel;  

// Check if pin is a special analog pin (A10 = temp sensor, A11 = Vcc/2, etc.)  
 if (pin >= 128)    channel = pin - 128;  
 else    channel = digitalPinToADCIn(pin);  // Check if pin is valid  if (pin == NOT_ON_ADC)    
 return 0;
 #if defined(__MSP430_HAS_ADC12_PLUS__)  
 ADC12CTL0 &= ~ADC12ENC;                 // disable ADC  
 ADC12CTL1 = ADC12SSEL_2 | ADC12DIV_0;   // ADC12OSC as ADC12CLK (~5MHz) / 5  
 while (REFCTL0 & REFGENBUSY);           // If ref generator busy, WAIT  
 if (pin == TEMPSENSOR) 
 {// if Temp Sensor    
     REFCTL0 = REF_MAP(INTERNAL1V5);               // Set reference to internal 1.5V    
     ADC12MCTL0 = channel | REFV_MAP(INTERNAL1V5); // set channel and reference  
 } 
  else 
 {    
     REFCTL0 = REF_MAP(analog_reference);          // Set reference using masking off the SREF bits. See Energia.h.   
     ADC12MCTL0 = channel | REFV_MAP(analog_reference); // set channel and reference  
 }  
 ADC12CTL0 = ADC12ON | ADC12SHT0_4;      // turn ADC ON; sample + hold @ 64