| /** | |
| * \file | |
| * | |
| * \brief SAM D20 PINMUX Driver Quick Start | |
| * | |
| * Copyright (C) 2012-2013 Atmel Corporation. All rights reserved. | |
| * | |
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| * | |
| * \page License | |
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| * Atmel microcontroller product. | |
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| */ | |
| /** | |
| * \page asfdoc_samd20_system_pinmux_basic_use_case Quick Start Guide for SYSTEM PINMUX - Basic | |
| * | |
| * In this use case, the PINMUX module is configured for: | |
| * \li One pin in input mode, with pull-up enabled, connected to the GPIO | |
| * module | |
| * \li Sampling mode of the pin changed to sample on demand | |
| * | |
| * This use case sets up the PINMUX to configure a physical I/O pin set as | |
| * an input with pull-up. and changes the sampling mode of the pin to reduce | |
| * power by only sampling the physical pin state when the user application | |
| * attempts to read it. | |
| * | |
| * \section asfdoc_samd20_system_pinmux_basic_use_case_setup Setup | |
| * | |
| * \subsection asfdoc_samd20_system_pinmux_basic_use_case_setup_prereq Prerequisites | |
| * There are no special setup requirements for this use-case. | |
| * | |
| * \section asfdoc_samd20_system_pinmux_basic_use_case_use_main Use Case | |
| * | |
| * \subsection asfdoc_samd20_system_pinmux_basic_use_case_code Code | |
| * Copy-paste the following code to your user application: | |
| * \snippet qs_pinmux_basic.c main | |
| * | |
| * \subsection asfdoc_samd20_system_pinmux_basic_use_case_flow Workflow | |
| * -# Create a PINMUX module pin configuration struct, which can be filled out | |
| * to adjust the configuration of a single port pin. | |
| * \snippet qs_pinmux_basic.c pinmux_config | |
| * -# Initialize the pin configuration struct with the module's default values. | |
| * \note This should always be performed before using the configuration | |
| * struct to ensure that all values are initialized to known default | |
| * settings. | |
| * | |
| * \snippet qs_pinmux_basic.c pinmux_config_defaults | |
| * -# Adjust the configuration struct to request an input pin with pullup | |
| * connected to the GPIO peripheral. | |
| * \snippet qs_pinmux_basic.c pinmux_update_config_values | |
| * -# Configure GPIO10 with the initialized pin configuration struct, to enable | |
| * the input sampler on the pin. | |
| * \snippet qs_pinmux_basic.c pinmux_set_config | |
| * -# Adjust the configuration of the pin to enable on-demand sampling mode. | |
| * \snippet qs_pinmux_basic.c pinmux_change_input_sampling | |
| */ |