Hello Carsten,
This know issue of Processor Expert. When one pin can be used as two different ADC channels in the single ended mode the fsl_adc component cannot select the channel number according to the pin (the same pin is used for two channels and there is not any other property that allows selection of the channel number). The issue will be fixed in the next release.
There is possible to use the following workaround for this issue:
The A/D Channel (pin) property is used for selection of the channel and also for the allocation of the pin (routing of the pin). When a channel cannot be selected (e.g. the ADC0_SE4a) you can select an internal signal (e.g. VDDA; the internal signal does not allocate any pin) as a placeholder for the configuration item in the adc16_chn_config_t structure that is generated in the source code file, see below:
The required pin can be selected in the PinSettings, i.e. open the ADC tab in the PinSettings and select the pin of the ADC for allocation and for routing of this pin, see below:
Generate code of the project and freeze the generated code for the fsl_adc component, i.e. in the context menu of the fsl_adc component select the Code Generation > Don't Write Generated Component Modules, see below:
The generated source code files will not be modified during generating code by the Processor Expert. You can modify the configuration structure and correct the channel number in the initialization code of the configuration structure (e.g. replace kAdc16Chn29 by kAdc16Chn4a in the adConv1 source code file), see below:
const adc16_chn_config_t adConv1_ChnConfig1 = {
.chnIdx = kAdc16Chn4a,
.convCompletedIntEnable = false,
.diffConvEnable = false
};
This modification of the project allows you to use all channels of the ADC and properly allocate (route) required pins.
Best Regards,
Marek Neuzil
Hello Carsten,
From the Reference manual of K02, the ADC input signal of "ADC0_SE4a" and "ADC0_SE4a" use the same pin PTE16,
and in the PE ,we can see the "A/D channel(pin)" selection is pin , so i think this button only can identify which pin ,while this
pin has TWO ADC channel , so it show error . When we select the channel as "ADC0_SE4b" or others , it will no error.
And if you want use "ADC0_SE4a" , i recommend you configure it us code , please refer to the demo code under SDK installation directory:
KSDK_1.2.0\examples\frdmk22f\driver_examples\adc16 :
in the demo code , you can see the configuration of the channel as this :
For example , if you want use che ADC0_SE4a , you can change it to :
| #define ADC16_TEMPERATURE_CHN | (kAdc16Chn4 ) |
And please pay attention to this : in the PE configure window , when the selection show this symbol of red , it meaning it can not select :
Hope it helps
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Have a great day,
Alice
