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Freescale/NXP MPC5606B: ADC CTU Program


TRK-MPC5606B
Task:While performing normal conversions on a few standard ADC channel inputs, use the CrossTriggering Unit (CTU) to trigger a conversion from an eMIOS channel event, where the channel isconfigured as Single Action Input Capture (SAIC).

In this example,
- ADC inputs ANS1 and ANS2 are continuously scanned.
- EMIOS and the CTU areconfigured so an input signal on eMIOS channel 2 will cause an event that “cross triggers” a conversionfor ANS0.
- To generate an input signal, eMIOS channel 3 is configured for OPWM.
- Both channels useeMIOS channel 23 configured as modulus counter for their time base.

Exercise:
Make the connections shown below:
- Connect ANS0 to a potentiometer or a known voltage.
- Connect ANS1:2 to other known voltages.
- Verify the eMIOS channel 2 injects an ADC command which reads the pot value.




Connections:
SIGNAL ADC0_Channel   PORT    SIU_PAD_CONFIG   PACKAGE_PIN(QFP/BGA) 
                                              (100 144  176)
ANS0        32        B8      PCR[24]=2000     39 53   R9
ANS1        33        B9      PCR[25]=2000     38 52   T9
ANS2        34        B10     PCR[26]=2000     40 54   P9
eMIOS0[2]   -         A2      PCR[2]=0503      5   9   F2
eMIOS0[3]   -         A3      PCR[3]=0600      68 90   K15     

Connect Jumper between PA[2] and PA[3]

Program Outcome:
          INPUT                   =>             OUTPUT 
ANS0 PB[8](CTU Inject Mode)   (ADC0) =>  LED1 (ON if Input>=500, else OFF)
ANS1 PB[9] (Normal Scan mode) (ADC0) =>  LED2 (ON if Input>=500, else OFF) 
ANS2 PB[10] (Normal Scan mode)(ADC0) =>  LED3 (ON if Input>=500, else OFF)
    
[LED4 is Continuously Toggling (Blinking) to Check Whether Program is executing in Infinite Loop] 
eMIOS0_3 PA[3] Generates 1KHz with 25% Duty Cycle 
eMIOS0_2 PA[2] injects conversion at ANS0 (ADC0). (CTU is used)


Downloads:
ADC_CTU_TRK-MPC5606B_APDaga

Click here to see more codes for Freescale/NXP MPC56xx Family.

Feel free to ask doubts in the comment section. I will try my best to solve it.
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Thanks and Regards,
-Akshay P. Daga

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