microchip-application-pec930-pec930_peripheral/Examples/adc/adc_trigger_src_io/readme.md

adc_trigger_src_io

This is an example to select the source (I/O) to trigger ADC start

It uses the specific pin to trigge ADC

• Select the ADC converison channel

  // in main.c
  #define CONFIG_ADC_IO_SRC_PORT          GPIOA
  #define CONFIG_ADC_IO_SRC_PIN           GPIO_Pin_09
  #define CONFIG_TARGGET_ADC_1_CHANNEL    ADC_Channel_03
  

• Select the specific pin to trigger ADC

  It supports PB1 (nRST) or PB2 (JTCK)

  PB1/PB2 MUST be changed to normal I/O mode

  // in main.c
  #define CONFIG_ADC_EXT_TRIG_SRC         ADC_ExtTrigSource_PB1
  

• Select the trigger mode of the specific pin

  It supports rising or falling trigger mode

  // in main.c
  #define CONFIG_ADC_EXT_TRIG_MODE        ADC_ExtTrigMode_PinRising
  

Log

Use serial port with baudrate 115200, 8bit, no parity check.

• Link PB1 to button

  • Trigger ADC when free button

    Oct  7 2025 15:46:32
    ADC Trigger single conversion (AIN-3) from external source (Pin: PB1 Rising)
       Button = PA2
    Press Button to setup I/O trigger ...
        PB1 (nRST) => I/O
      1-th ADC Single Conv Value = 0x77C (1916) <--- Trigger ADC when free button
      2-th ADC Single Conv Value = 0x778 (1912)
      3-th ADC Single Conv Value = 0x77A (1914)
      4-th ADC Single Conv Value = 0x77E (1918)
      5-th ADC Single Conv Value = 0x77F (1919)
    

  • Trigger ADC when press button

    Oct  7 2025 15:59:09
    ADC Trigger single conversion (AIN-3) from external source (Pin: PB1 Falling)
       Button = PA2
    Press Button to setup I/O trigger ...
        PB1 (nRST) => I/O
      1-th ADC Single Conv Value = 0x775 (1909) <--- Trigger ADC when press button
      2-th ADC Single Conv Value = 0x789 (1929)
      3-th ADC Single Conv Value = 0x78A (1930)
      4-th ADC Single Conv Value = 0x777 (1911)
    

• Link PB2 to button

  • Trigger ADC when free button

    Oct  7 2025 16:18:35
    ADC Trigger single conversion (AIN-3) from external source (Pin: PB2 Rising)
       Button = PA2
    Press Button to setup I/O trigger ...
      1-th ADC Single Conv Value = 0x7DF (2015) <--- Link ICE handshaking
      2-th ADC Single Conv Value = 0x722 (1826)
      3-th ADC Single Conv Value = 0x6E8 (1768)
      4-th ADC Single Conv Value = 0x752 (1874)
      5-th ADC Single Conv Value = 0x748 (1864)
      6-th ADC Single Conv Value = 0x675 (1653)
        PB2 (JTCK) => I/O                       <--- disable ICE
      7-th ADC Single Conv Value = 0x789 (1929) <--- free button
      8-th ADC Single Conv Value = 0x7E5 (2021)
    ...
    

  • Trigger ADC when press button

    Oct  3 2025 16:22:41
    ADC Trigger single conversion (AIN-3) from external source (Pin: PB2 Falling)
       Button = PA2
    Press Button to setup I/O trigger ...
    ...
      31-th ADC Single Conv Value = 0x78A (1930) <--- Link ICE handshaking
      32-th ADC Single Conv Value = 0x77B (1915)
      33-th ADC Single Conv Value = 0x7A8 (1960)
      34-th ADC Single Conv Value = 0x792 (1938)
      35-th ADC Single Conv Value = 0x777 (1911) <--- Link ICE handshaking
        PB2 (JTCK) => I/O                        <--- disable ICE
      36-th ADC Single Conv Value = 0x7EC (2028) <--- press button
      37-th ADC Single Conv Value = 0x777 (1911)
      38-th ADC Single Conv Value = 0x78E (1934)
      39-th ADC Single Conv Value = 0x792 (1938)