tool/mbed/mbed-sdk/libraries/tests/mbed/analog_in/main.cpp

   1 /*
   2  * Version of the Analog test,
   3  * Intended for use by devices which
   4  * don't have analog out.
   5  *
   6  * Connect 'control' to pin 21 of an mbed LPC1768
   7  * Connect 'analogInput' to pin 18 of an mbed LPC1768
   8  * Connect 'TX/RX' to pins 27 and 28 of an mbed LPC1768
   9  *
  10  * Upload:
  11 */
  12 #include "test_env.h"
  13
  14 #define ERROR_TOLERANCE 0.05
  15
  16 #if defined(TARGET_LPC1114)
  17
  18 AnalogIn analogInput(dp4);
  19 DigitalOut control(dp5);
  20 DigitalOut indicator(LED1);
  21
  22 #else
  23
  24 #endif
  25
  26 uint8_t successes = 0;
  27
  28 int main() {
  29         control = 0;
  30
  31         for (int i = 0; i < 10; i++) {
  32                 // Read value,
  33                 float expectedValue = i * 0.1;
  34                 float value = analogInput.read();
  35
  36                 if (value > expectedValue + ERROR_TOLERANCE || value < expectedValue - ERROR_TOLERANCE) {
  37                         // Failure.
  38                         printf("ERROR (out:%.4f) - (in:%.4f) = (%.4f)"NL, expectedValue, value, fabs(expectedValue - value));
  39                 }
  40                 else {
  41                         printf("OK    (out:%.4f) - (in:%.4f) = (%.4f)"NL, out_value, in_value, diff);
  42                         successes++;
  43                 }
  44
  45                 control = 1;
  46                 indicator = 1;
  47                 wait(0.1);
  48                 control = 0;
  49                 indicator = 0;
  50         }
  51
  52         if (successes > 8) {
  53                 notify_success(true);
  54         }
  55         else {
  56                 notify_success(false);
  57         }
  58 }