/** | |
* \file | |
* | |
* \brief SAM D20 PINMUX Driver Quick Start | |
* | |
* Copyright (C) 2012-2013 Atmel Corporation. All rights reserved. | |
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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 | |
*/ |