How can I synchronize the ADC conversation with the PWM Output Block, so that the conversation definitly isn't started in the rising or falling edge ?
I want to Trigger the ADC conversation after the PWM Output has a rising edge.
My idea is to set the Output Trigger in the Three_Phase_Output block. But which one ?
I saw this tab in the Three_Phase_Output block:
Where can I find the signals PWM X VAL n ?
The selected Output pin I should configure in the ADC config block.
But here after SYNC0 and ADCA Alternate Trigger are selected only this list is displayed.
Hello lethuer,
In order to trigger directly the ADC interrupt from the flexPWM block you need to do the following changes:
1. Select output Triggers from the Three_Phase_Output block (for the example attached I chose PWM A VAL3 - falling edge of the A[0] output pin). In order to understand what output triggers you need to choose, please read from the Kinetis RM the Functional Description of the eFlexPWM, Chapter 38.
2. For ADC_Config, you need to choose the XBARA output 12 and then as ADC XBARA Trigger you need to select one according to previously selected trigger (Three_Phase_Output); please read in the same RM, Chapter 27.
3. Finally you need to disable the ADC Start conversion block for each channel since the trigger will be done by the PWM.
I have attached a working example like you asked by computing all the values inside the interrupt. Please be aware of the block execution order by changing the blocks priority if you want a block to be executed before or after another.
Hope this helps,
Marius
I still have this question and I try it again.
In the Reference Manual I found this:
This is why I configure this in the ADC Config Block:
In the PWM Block different values are available.
In center alaigned type these are:
So I configure the following in the PWM Block:
So in the Reference Manual I found this:
--> In my opinion the yellow marked numbers in the picture above are the VAL0, VAL1, VAL2 and VAL3 which you can choose in the PWM Block, correct so far ?
--> The second number marked in the picture above should be the TRIG0 or TRIG1 ?
Because I activate VAL0 I would ecpect the connection to XBARA_IN21. (second line in the picture above: PWM0_OUT_TRIG01)
But XBARA_IN21 has PWMA0_TRIG1 as assigned output.
So why I have to configure PWMA0_Trigger 0 in the ADC Config Block as ADCA XBARA Trigger ?
Hello lethuer,
In order to trigger directly the ADC interrupt from the flexPWM block you need to do the following changes:
1. Select output Triggers from the Three_Phase_Output block (for the example attached I chose PWM A VAL3 - falling edge of the A[0] output pin). In order to understand what output triggers you need to choose, please read from the Kinetis RM the Functional Description of the eFlexPWM, Chapter 38.
2. For ADC_Config, you need to choose the XBARA output 12 and then as ADC XBARA Trigger you need to select one according to previously selected trigger (Three_Phase_Output); please read in the same RM, Chapter 27.
3. Finally you need to disable the ADC Start conversion block for each channel since the trigger will be done by the PWM.
I have attached a working example like you asked by computing all the values inside the interrupt. Please be aware of the block execution order by changing the blocks priority if you want a block to be executed before or after another.
Hope this helps,
Marius
