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.
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Thanks and Regards,
-Akshay P. Daga