SAM Analog to Digital Converter (ADC) Unit test.

#include <asf.h>
#include <stdio_serial.h>
#include <string.h>
#include "conf_test.h"

Macros
#define	ADC_OFFSET 150

#define	ADC_SAMPLES 128

#define	ADC_VAL_DAC_FULL_OUTPUT 4095

#define	ADC_VAL_DAC_HALF_OUTPUT 2047

#define	DAC_VAL_HALF_VOLT 512

#define	DAC_VAL_ONE_VOLT 1023

Functions
static void	adc_user_callback (struct adc_module *const module)
	ADC callback function. More...

static void	cdc_uart_init (void)
	Initialize the USART for unit test. More...

static void	cleanup_adc_callback_mode_test (const struct test_case *test)
	Cleanup Function: ADC callback mode test. More...

static void	cleanup_adc_window_mode_test (const struct test_case *test)
	Cleanup Function: ADC window mode test. More...

int	main (void)
	Run ADC unit tests. More...

static void	run_adc_average_mode_test (const struct test_case *test)
	ADC average mode test function. More...

static void	run_adc_callback_mode_test (const struct test_case *test)
	ADC callback mode test function. More...

static void	run_adc_init_test (const struct test_case *test)
	Test for ADC initialization. More...

static void	run_adc_polled_mode_test (const struct test_case *test)
	Test for ADC conversion in polled mode. More...

static void	run_adc_window_mode_test (const struct test_case *test)
	ADC window mode test function. More...

static void	setup_adc_average_mode_test (const struct test_case *test)
	Setup Function: ADC average mode test. More...

static void	setup_adc_callback_mode_test (const struct test_case *test)
	Setup Function: ADC callback mode test. More...

static void	setup_adc_window_mode_test (const struct test_case *test)
	Setup Function: ADC window mode test. More...

static void	test_dac_init (void)
	Initialize the DAC for unit test. More...

Variables
uint16_t	adc_buf [ADC_SAMPLES]

volatile bool	adc_init_success = false

struct adc_module	adc_inst

struct usart_module	cdc_uart_module

struct dac_module	dac_inst

volatile bool	interrupt_flag = false

#define ADC_OFFSET 150

Referenced by run_adc_average_mode_test(), run_adc_callback_mode_test(), run_adc_polled_mode_test(), and setup_adc_window_mode_test().

#define ADC_SAMPLES 128

Referenced by cleanup_adc_callback_mode_test(), run_adc_callback_mode_test(), and setup_adc_callback_mode_test().

#define ADC_VAL_DAC_FULL_OUTPUT 4095

Referenced by run_adc_polled_mode_test().

#define ADC_VAL_DAC_HALF_OUTPUT 2047

Referenced by run_adc_average_mode_test(), run_adc_callback_mode_test(), run_adc_polled_mode_test(), and setup_adc_window_mode_test().

#define DAC_VAL_HALF_VOLT 512

Referenced by run_adc_average_mode_test(), run_adc_callback_mode_test(), run_adc_polled_mode_test(), and setup_adc_window_mode_test().

#define DAC_VAL_ONE_VOLT 1023

Referenced by run_adc_polled_mode_test(), and run_adc_window_mode_test().

static void adc_user_callback ( struct adc_module *const module )

static

ADC callback function.

Called by ADC driver on interrupt detection.

Parameters

module Pointer to the ADC module (not used)

References interrupt_flag.

Referenced by setup_adc_callback_mode_test(), and setup_adc_window_mode_test().

static void cdc_uart_init ( void )

static

Initialize the USART for unit test.

Initializes the SERCOM USART (SERCOM4) used for sending the unit test status to the computer via the EDBG CDC gateway.

References usart_config::baudrate, cdc_uart_module, usart_config::mux_setting, usart_config::pinmux_pad0, usart_config::pinmux_pad1, usart_config::pinmux_pad2, usart_config::pinmux_pad3, usart_enable(), and usart_get_config_defaults().

Referenced by main().

static void cleanup_adc_callback_mode_test ( const struct test_case * test )

static

Cleanup Function: ADC callback mode test.

This function clears the ADC result buffer and unregisters & disables callback for the ADC buffer read.

Parameters

test	Current test case.

References adc_buf, ADC_CALLBACK_READ_BUFFER, adc_disable_callback(), adc_inst, ADC_SAMPLES, adc_unregister_callback(), and i.

Referenced by main().

static void cleanup_adc_window_mode_test ( const struct test_case * test )

static

Cleanup Function: ADC window mode test.

This function unregisters & disables callback for window detection.

Parameters

test	Current test case.

References ADC_CALLBACK_WINDOW, adc_disable_callback(), adc_inst, and adc_unregister_callback().

Referenced by main().

int main ( void )

Run ADC unit tests.

Initializes the system and serial output, then sets up the ADC unit test suite and runs it.

References cdc_uart_init(), cleanup_adc_callback_mode_test(), cleanup_adc_window_mode_test(), DEFINE_TEST_ARRAY, DEFINE_TEST_CASE, DEFINE_TEST_SUITE, delay_init(), NULL, run_adc_average_mode_test(), run_adc_callback_mode_test(), run_adc_init_test(), run_adc_polled_mode_test(), run_adc_window_mode_test(), setup_adc_average_mode_test(), setup_adc_callback_mode_test(), setup_adc_window_mode_test(), system_init(), test_dac_init(), and test_suite_run().

static void run_adc_average_mode_test ( const struct test_case * test )

static

ADC average mode test function.

This test performs the ADC averaging by starting a conversion. 0.5V is applied as input from DAC. Converted result is verified for expected results.

Parameters

test	Current test case.

References adc_inst, ADC_OFFSET, adc_read(), adc_start_conversion(), ADC_VAL_DAC_HALF_OUTPUT, dac_chan_write(), DAC_CHANNEL_0, dac_inst, DAC_VAL_HALF_VOLT, delay_ms, STATUS_OK, and test_assert_true.

Referenced by main().

static void run_adc_callback_mode_test ( const struct test_case * test )

static

ADC callback mode test function.

This test checks the callback functionality of the ADC driver. ADC callback for buffered conversion is enabled. Converted results are verified for expected results.

Parameters

test	Current test case.

References adc_buf, adc_inst, ADC_OFFSET, adc_read_buffer_job(), ADC_SAMPLES, ADC_VAL_DAC_HALF_OUTPUT, dac_chan_write(), DAC_CHANNEL_0, dac_inst, DAC_VAL_HALF_VOLT, delay_ms, i, interrupt_flag, and test_assert_true.

Referenced by main().

static void run_adc_init_test ( const struct test_case * test )

static

Test for ADC initialization.

This test initializes the ADC module and checks whether the initialization is successful or not.

If this test fails no other tests will run.

Parameters

test	Current test case.

References adc_enable(), adc_get_config_defaults(), adc_init(), adc_init_success, adc_inst, ADC_REFERENCE_INTREF, adc_config::clock_source, GCLK_GENERATOR_3, adc_config::negative_input, adc_config::positive_input, adc_config::reference, STATUS_ERR_IO, STATUS_OK, and test_assert_true.

Referenced by main().

static void run_adc_polled_mode_test ( const struct test_case * test )

static

Test for ADC conversion in polled mode.

This test checks the polled mode functionality of the ADC. 0.5V and 1V inputs are applied to the ADC via DAC and the ADC outputs are verified for expected results.

Parameters

test	Current test case.

References adc_flush(), adc_init_success, adc_inst, ADC_OFFSET, adc_read(), adc_start_conversion(), ADC_VAL_DAC_FULL_OUTPUT, ADC_VAL_DAC_HALF_OUTPUT, dac_chan_write(), DAC_CHANNEL_0, dac_inst, DAC_VAL_HALF_VOLT, DAC_VAL_ONE_VOLT, delay_ms, i, STATUS_OK, and test_assert_true.

Referenced by main().

static void run_adc_window_mode_test ( const struct test_case * test )

static

ADC window mode test function.

This test gives an input voltage outside the window and checks whether the callback is triggered or not.

Parameters

test	Current test case.

References dac_chan_write(), DAC_CHANNEL_0, dac_inst, DAC_VAL_ONE_VOLT, delay_ms, interrupt_flag, and test_assert_true.

Referenced by main().

static void setup_adc_average_mode_test ( const struct test_case * test )

static

Setup Function: ADC average mode test.

This function initializes the ADC in averaging mode.

Parameters

test	Current test case.

References adc_disable(), adc_enable(), adc_get_config_defaults(), adc_init(), adc_init_success, adc_inst, ADC_REFERENCE_INTREF, adc_config::clock_source, GCLK_GENERATOR_3, adc_config::negative_input, adc_config::positive_input, adc_config::reference, STATUS_ERR_IO, STATUS_OK, and test_assert_true.

Referenced by main().

static void setup_adc_callback_mode_test ( const struct test_case * test )

static

Setup Function: ADC callback mode test.

This function initializes the ADC result buffer and registers & enables callback for the ADC buffer read.

Parameters

test	Current test case.

References adc_buf, ADC_CALLBACK_READ_BUFFER, adc_enable_callback(), adc_init_success, adc_inst, adc_register_callback(), ADC_SAMPLES, adc_user_callback(), i, interrupt_flag, and test_assert_true.

Referenced by main().

static void setup_adc_window_mode_test ( const struct test_case * test )

static

Setup Function: ADC window mode test.

This function initializes the ADC in window mode. Upper and lower threshold values are provided. It also registers & enables callback for window detection.

Parameters