Freescale/NXP MPC5606B: eMIOS0 ADC0 Program


TRK-MPC5606B
In this example,
- We will be testing eMIOS by generating 6 PWM output simultaneously and will be changing its duty cycle in run time using Potentiometer which is connected to ADC0 input. At the same time, ADC input is indicated using 4 LEDs as follows:


Program Outcome:
20KHz PWM at 
 eMIOS0_1 => PA[1],   eMIOS0_2 => PA[2], 
 eMIOS0_3 => PA[3],   eMIOS0_4 => PA[4], 
 eMIOS0_5 => PA[5],   eMIOS0_6 => PA[6]. 
 
Initial Duty_Cycle = 10%

Input(Analog)       =>   Output
PB[8] (ADC0_S0)     =>  (eMIOS0_1 to eMIOS0_6) & [LED1 LED2 LED3 LED4] 
ADC0 = [0 to 1023]  =>  Duty_Cycle = [0% to 98%] & LED Indication 

Input Pot value (Digital)   =>   [LED1 LED2 LED3 LED4] Output
0    to  200                =>    ON   OFF  OFF  OFF 
201  to  500                =>    ON   ON   OFF  OFF
501  to  800                =>    ON   ON   ON   OFF
801  to  1023               =>    ON   ON   ON   ON



Changelog:
26/03/2016: Bug:Phase lag of 1uSec is present between (eMIOS0_1,2,3) and (eMIOS0_4,5,6)
26/03/2016: Bug:Phase lag of 1uSec is present between (eMIOS0_1,2,3) and (eMIOS0_4,5,6) 
01/04/2016: Phase lag removed. [clear the GTBE bit at beginning of Init_eMIOS() and set it at the end of the Init_eMIOS().] 
18/04/2016: Remove PCTL[32] & PCTL[68] command from InitModesAndClks function to run eMIOS and ADC together

Connections:
eMIOS No.  => Port No. => Pad No. => Pin No.(144-pin LQFP package)
eMIOS0_1   => PA[1]   =>  PCR[1]  => PIN 11
eMIOS0_2   => PA[2]   =>  PCR[2]  => PIN 9
eMIOS0_3   => PA[3]   =>  PCR[3]  => PIN 90
eMIOS0_4   => PA[4]   =>  PCR[4]  => PIN 43
eMIOS0_5   => PA[5]   =>  PCR[5]  => PIN 118
eMIOS0_6   => PA[6]   =>  PCR[6]  => PIN 119

SIGNAL ADC0_Channel   PORT    SIU_PAD_CONFIG   PACKAGE_PIN (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  

Potentiometer is connected to ANS0 (B8) for this program.

Calculations:
Frequency Calculation of PWM:     
         For "x" Hz Frequency, B_VAL = 1/[(x)*10^-6]  
Duty Cycle Calculation of PWM:    
         For "y" % Duty Cycle, A_VAL = (y)*100/(x)

Testing:- Output PWM waveform can be observed on DSO.
- Potentiometer input can be seen approximately on 4 LEDs in discrete range.
Exercise:
Make the connections shown below:
- Connect DSO probe +ve terminal to eMIOS0_1 PA[1] and DSO prob gnd to the gnd of the TRK-MPC5606B board.
- Similarly, Connect remaining eMIOS0 and test it.

Downloads:
eMIOS0_ADC0_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.
If you find this helpful by any mean like, comment and share the post.
This is the simplest way to encourage me to keep doing such work.

Thanks and Regards,
-Akshay P. Daga
Post a Comment (0)
Previous Post Next Post