Reading battery voltage on Argon

iitgrad · November 7, 2022, 7:36pm

Given this schematic of the Argon, is the proper way to read the pin P0.05/AIN3 like this?

int32_t voltage = analogRead(BATT);

BATT is defined as pin 33 but I’m not sure what this relates to in the actual hardware.

thanks

gusgonnet · November 7, 2022, 7:40pm

hey, does this help?

source

iitgrad · November 7, 2022, 7:42pm

Yep, helps confirm what I was thinking. Thanks @gusgonnet. I was just trying to map via documentation how one gets from BATT to the schematic. :-). Since BATT is just a constant at 33, wasn’t sure how 33 gets to AIN3.

rickkas7 · November 9, 2022, 10:24am

The fifth column in this table is the source of truth for that. It’s the analog input channel a GPIO is connected to. There’s one of these tables in the Device OS source for every platform:

github.com

particle-iot/device-os/blob/develop/hal/src/argon/pinmap_hal.c#L56


      
          /* RGBB          - 23 */ { NRF_PORT_0, 15, PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, 0,                 3,                8, EXTI_CHANNEL_NONE, 0},
          /* TX1           - 24 */ { NRF_PORT_1, 5,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* RX1           - 25 */ { NRF_PORT_1, 4,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* CTS1          - 26 */ { NRF_PORT_1, 6,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* RTS1          - 27 */ { NRF_PORT_1, 7,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* ESPBOOT       - 28 */ { NRF_PORT_0, 16, PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* ESPEN         - 29 */ { NRF_PORT_0, 24, PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* HWAKE         - 30 */ { NRF_PORT_0, 7,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* ANTSW1        - 31 */ { NRF_PORT_0, 2,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* ANTSW2        - 32 */ { NRF_PORT_0, 25, PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* BATT          - 33 */ { NRF_PORT_0, 5,  PIN_MODE_NONE, PF_NONE, 3,                PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* PWR           - 34 */ { NRF_PORT_0, 12, PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          /* CHG           - 35 */ { NRF_PORT_1, 9,  PIN_MODE_NONE, PF_NONE, ADC_CHANNEL_NONE, PWM_INSTANCE_NONE, PWM_CHANNEL_NONE, 8, EXTI_CHANNEL_NONE, 0},
          };
          
          
const uint8_t NRF_PIN_LOOKUP_TABLE[48] = {
              PIN_INVALID, PIN_INVALID, 31,          19,          18,          33,          9,           30,          /* P0.00 ~ P0.07 */
              10,          PIN_INVALID, PIN_INVALID, 20,          34,          21,          22,          23,          /* P0.08 ~ P0.15 */
              28,          PIN_INVALID, PIN_INVALID, PIN_INVALID, PIN_INVALID, PIN_INVALID, PIN_INVALID, PIN_INVALID, /* P0.16 ~ P0.23 */
              29,          32,          0,           1,           17,          16,          15,          14,          /* P0.24 ~ P0.31 */
              PIN_INVALID, 2,           3,           8,           25,          24,          26,          27,          /* P1.00 ~ P1.07 */

system · December 9, 2022, 8:24pm

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Reading battery voltage on Argon

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