energia/Energia

CC3220S analogRead incorrect reading

dcjw opened this issue · 0 comments

dcjw commented

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Please provide the following information.

  • LaunchPad board name and version: CC3220S_LAUNCHXL (Rev-A)
  • Energia IDE version (found in Energia > About Energia menu): 1.8.7E21
  • Board package version (found in Tools > Boards > Boards Manager menu): 5.6.2
  • OS name and version: Windows 10

Describe the expected results.

`I tried to perform an analogRead with analog pins (pin 57 - 60) on CC3220S launch pad. Input voltage was around 1.1V. From the CC3220S launch pad schematics, there is a voltage divider ( 422 / 998 ) before ADC, so I would expect ADC code to be around 1360. Could it be there are additional ADC setup required (clock, register configuration, etc)?

My code basically just calls analogRead periodically as shown below.

void setup() {
// put your setup code here, to run once:
Serial.begin(250000);
}
void loop(){
int out = analogRead(24);
Serial.print(out);
delay(1000);
}
`

Describe the actual results.

However, the ADC code turned out to be 333 (around 0.11V)

List the steps to reproduce the problem.

Compile and run the code above. Drive pin60 with different voltages and observe output in Serial monitor