This section covers functions related to the SAM L22's analog-to-digital converter, as well as configuring and reading values from the five analog-capable pins on the 9-pin connector. More...

- -

+
Enumerations
enum	watch_adc_reference_voltage { ADC_REFERENCE_INTREF = 0 +
enum	watch_adc_reference_voltage { ADC_REFERENCE_INTREF = 0 , ADC_REFERENCE_VCC_DIV1POINT6 , ADC_REFERENCE_VCC_DIV2 , ADC_REFERENCE_VCC }

- - + @@ -115,9 +114,9 @@ void

+
Functions
-void	watch_enable_adc (void)
+void	watch_enable_adc (void)
	Enables the ADC peripheral. You must call this before attempting to read a value from an analog pin.

void	watch_enable_analog_input (const uint8_t pin)

Detailed Description

-

This section covers functions related to the SAM L22's analog-to-digital converter, as well as configuring and reading values from the five analog-capable pins on the 9-pin connector.

+

This section covers functions related to the SAM L22's analog-to-digital converter, as well as configuring and reading values from the five analog-capable pins on the 9-pin connector.

Function Documentation

- +

◆ watch_disable_adc()

@@ -138,7 +137,7 @@ void +

◆ watch_disable_analog_input()

@@ -164,7 +163,7 @@ void +

◆ watch_enable_analog_input()

@@ -190,7 +189,7 @@ void +

◆ watch_get_analog_pin_level()

@@ -218,7 +217,7 @@ void +

◆ watch_get_vcc_voltage()

@@ -235,11 +234,11 @@ void

Returns the voltage of the VCC supply in millivolts (i.e. 3000 mV == 3.0 V). If running on a coin cell, this will be the battery voltage.

-

Unlike other ADC functions, this function does not return a raw value from the ADC, but rather scales it to an actual number of millivolts. This is because the ADC doesn't let us measure VCC per se; it instead lets us measure VCC / 4, and we choose to measure it against the internal reference voltage of 1.024 V. In short, the ADC gives us a number that's complicated to deal with, so we just turn it into a useful number for you :)

Note: This function depends on INTREF being 1.024V. If you have changed it by poking at the supply controller's VREF.SEL bits, this function will return inaccurate values.

+

Unlike other ADC functions, this function does not return a raw value from the ADC, but rather scales it to an actual number of millivolts. This is because the ADC doesn't let us measure VCC per se; it instead lets us measure VCC / 4, and we choose to measure it against the internal reference voltage of 1.024 V. In short, the ADC gives us a number that's complicated to deal with, so we just turn it into a useful number for you :)

Note: This function depends on INTREF being 1.024V. If you have changed it by poking at the supply controller's VREF.SEL bits, this function will return inaccurate values.

- +

◆ watch_set_analog_num_samples()

@@ -272,7 +271,7 @@ void +

◆ watch_set_analog_reference_voltage()

@@ -296,12 +295,12 @@ void +

◆ watch_set_analog_sampling_length()

@@ -332,7 +331,7 @@ void -- cgit v1.2.3

+

Enumerations

+

Functions