371 lines
11 KiB
C
371 lines
11 KiB
C
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/**
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*
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* \file
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*
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* \brief SAM UART Driver for SAMB11
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*
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* Copyright (C) 2015-2016 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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/*
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* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
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*/
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#ifndef UART_H_INCLUDED
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#define UART_H_INCLUDED
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/**
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* \defgroup asfdoc_samb_uart_group SAM UART Driver (UART)
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*
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* This driver for Atmel® | SMART SAM devices provides an interface for the
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* configuration and management of the device's Universal Asynchronous
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* Receiver/Transmitter (UART) interfaces functionality.
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*
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* The following peripherals are used by this module:
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* - UART (Universal Asynchronous Receiver/Transmitter)
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*
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* The following devices can use this module:
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* - Atmel | SMART SAM B11
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*
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* The outline of this documentation is as follows:
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* - \ref asfdoc_samb_uart_prerequisites
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* - \ref asfdoc_samb_uart_module_overview
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* - \ref asfdoc_samb_uart_special_considerations
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* - \ref asfdoc_samb_uart_extra_info
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* - \ref asfdoc_samb_uart_examples
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* - \ref asfdoc_samb_uart_api_overview
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*
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*
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* \section asfdoc_samb_uart_prerequisites Prerequisites
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*
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* There are no prerequisites for this module.
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*
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*
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* \section asfdoc_samb_uart_module_overview Module Overview
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*
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* The device UART module provides an interface between the user application
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* logic and hardware peripheral. This driver provides an easy-to-use interface
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* to transfer and receive data.
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*
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* \section asfdoc_samb_uart_special_considerations Special Considerations
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*
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* There are no special considerations for this module.
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*
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* \section asfdoc_samb_uart_extra_info Extra Information
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*
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* For extra information, see \ref asfdoc_samb_uart_extra. This includes:
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* - \ref asfdoc_samb_uart_extra_acronyms
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* - \ref asfdoc_samb_uart_extra_dependencies
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* - \ref asfdoc_samb_uart_extra_errata
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* - \ref asfdoc_samb_uart_extra_history
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*
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*
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* \section asfdoc_samb_uart_examples Examples
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*
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* For a list of examples related to this driver, see
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* \ref asfdoc_samb_uart_exqsg.
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*
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*
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* \section asfdoc_samb_uart_api_overview API Overview
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* @{
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*/
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#include <compiler.h>
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#include <system_sam_b.h>
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#include <gpio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \brief UART byte bit selection
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*
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* Number of bit per byte selection for UART communication.
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*/
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enum uart_number_of_bit_selection{
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/** 8 bit per byte*/
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UART_8_BITS = UART_CONFIGURATION_NUMBER_OF_BITS_0,
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/** 7 bit per byte*/
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UART_7_BITS = UART_CONFIGURATION_NUMBER_OF_BITS_1,
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};
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/** \brief UART stop bit selection
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*
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* Number of stop bit selection for UART communication.
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*/
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enum uart_stop_bit_selection{
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/** 1 stop bit per byte*/
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UART_1_STOP_BIT = UART_CONFIGURATION_STOP_BITS_0,
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/** 2 stop bit per byte*/
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UART_2_STOP_BITS = UART_CONFIGURATION_STOP_BITS_1,
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};
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/** \brief UART Parity selection
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*
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* Parity type selection for UART communication.
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*/
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enum uart_parity_selection{
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/** No parity bit */
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UART_NO_PARITY = 0,
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/** Even parity */
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UART_EVEN_PARITY,
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/** Odd parity */
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UART_ODD_PARITY,
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/** Space parity */
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UART_SPACE_PARITY,
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/** Mark parity */
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UART_MARK_PARITY
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};
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/**
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* \brief UART module instance
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*
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* Forward Declaration for the device instance.
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*/
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struct uart_module;
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/**
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* \brief UART callback type
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*
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* Type of the callback functions.
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*/
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typedef void (*uart_callback_t)(struct uart_module *const module);
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/**
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* \brief UART Callback enum
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*
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* Callbacks for the UART driver.
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*/
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enum uart_callback {
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/** Callback for TX FIFO not full. */
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UART_TX_COMPLETE,
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/** Callback for CTS active. */
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UART_CTS_ACTIVE,
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/** Callback for RX FIFO overrun. */
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UART_RX_COMPLETE,
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/** Callback for RX FIFO overrun. */
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UART_RX_FIFO_OVERRUN,
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/** Number of available callbacks. */
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UART_CALLBACK_N,
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};
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/**
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* \brief Configuration structure for the UART module
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*
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* This is the configuration structure for the UART Module in SAMB11. It
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* is used as an argument for \ref uart_init to provide the desired
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* configurations for the module. The structure should be initialized using the
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* \ref uart_get_config_defaults .
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*/
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struct uart_config{
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/** Baud rate */
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uint32_t baud_rate;
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/** Number of data bits */
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enum uart_number_of_bit_selection data_bits;
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/** Number of stop bits */
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enum uart_stop_bit_selection stop_bits;
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/** Parity type */
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enum uart_parity_selection parity;
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/** flow control type */
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bool flow_control;
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/** UART PAD pin number */
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uint32_t pin_number_pad[4];
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/** UART PAD pinmux selection */
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uint32_t pinmux_sel_pad[4];
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};
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/**
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* \brief UART driver software device instance structure.
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*
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* UART driver software instance structure, used to retain software
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* state information of an associated hardware module instance.
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*
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* \note The fields of this structure should not be altered by the user
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* application; they are reserved for module-internal use only.
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*/
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struct uart_module {
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/** Pointer to the hardware instance. */
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Uart *hw;
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/** Array to store callback function pointers in. */
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uart_callback_t callback[UART_CALLBACK_N];
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/** Buffer pointer to where the next received character will be put */
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volatile uint8_t *rx_buffer_ptr;
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/** Buffer pointer to where the next character will be transmitted from
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**/
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volatile uint8_t *tx_buffer_ptr;
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/** Remaining characters to receive */
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volatile uint16_t remaining_rx_buffer_length;
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/** Remaining characters to transmit */
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volatile uint16_t remaining_tx_buffer_length;
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/** Bit mask for callbacks registered. */
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uint8_t callback_reg_mask;
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/** Bit mask for callbacks enabled. */
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uint8_t callback_enable_mask;
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/** Holds the status of the ongoing or last operation */
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volatile enum status_code status;
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};
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/** \name UART Configuration and initialization
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* @{
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*/
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void uart_get_config_defaults(struct uart_config *const config);
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enum status_code uart_init(struct uart_module *const module, Uart * const hw,
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const struct uart_config *const config);
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/** @} */
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/** \name UART read and write functions
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* @{
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*/
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enum status_code uart_write_wait(struct uart_module *const module,
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const uint8_t tx_data);
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enum status_code uart_read_wait(struct uart_module *const module,
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uint8_t *const rx_data);
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enum status_code uart_write_buffer_wait(struct uart_module *const module,
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const uint8_t *tx_data, uint32_t length);
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enum status_code uart_read_buffer_wait(struct uart_module *const module,
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uint8_t *rx_data, uint16_t length);
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enum status_code uart_write_buffer_job(struct uart_module *const module,
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uint8_t *tx_data, uint32_t length);
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enum status_code uart_read_buffer_job(struct uart_module *const module,
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uint8_t *rx_data, uint16_t length);
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/** @} */
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/** \name UART callback config
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* @{
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*/
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void uart_register_callback(struct uart_module *const module,
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uart_callback_t callback_func,
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enum uart_callback callback_type);
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void uart_unregister_callback(struct uart_module *module,
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enum uart_callback callback_type);
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void uart_enable_callback(struct uart_module *const module,
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enum uart_callback callback_type);
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void uart_disable_callback(struct uart_module *const module,
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enum uart_callback callback_type);
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/** @}*/
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/** \name UART DAM enable/disable functions
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* @{
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*/
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void uart_enable_transmit_dma(struct uart_module *const module);
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void uart_disable_transmit_dma(struct uart_module *const module);
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void uart_enable_receive_dma(struct uart_module *const module);
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void uart_disable_receive_dma(struct uart_module *const module);
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/** @}*/
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/** @}*/
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#ifdef __cplusplus
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}
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#endif
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/**
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* \page asfdoc_samb_uart_extra Extra Information for UART Driver
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*
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* \section asfdoc_samb_uart_extra_acronyms Acronyms
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* Below is a table listing the acronyms used in this module, along with their
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* intended meanings.
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*
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* <table>
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* <tr>
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* <th>Acronym</th>
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* <th>Description</th>
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* </tr>
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* <tr>
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* <td>UART</td>
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* <td>Universal Asynchronous Receiver/Transmitter</td>
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* </tr>
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* </table>
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*
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*
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* \section asfdoc_samb_uart_extra_dependencies Dependencies
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* There are no dependencies related to this driver.
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*
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*
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* \section asfdoc_samb_uart_extra_errata Errata
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* There are no errata related to this driver.
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*
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*
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* \section asfdoc_samb_uart_extra_history Module History
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* An overview of the module history is presented in the table below, with
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* details on the enhancements and fixes made to the module since its first
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* release. The current version of this corresponds to the newest version in
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* the table.
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*
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* <table>
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* <tr>
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* <th>Changelog</th>
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* </tr>
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* <tr>
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* <td>Initial Release</td>
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* </tr>
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* </table>
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*/
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/**
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* \page asfdoc_samb_uart_exqsg Examples for UART Driver
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*
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* This is a list of the available Quick Start guides (QSGs) and example
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* applications for \ref asfdoc_samb_uart_group. QSGs are simple examples with
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* step-by-step instructions to configure and use this driver in a selection of
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* use cases. Note that QSGs can be compiled as a standalone application or be
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* added to the user application.
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*
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* - \subpage asfdoc_samb_uart_basic_use_case
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* - \subpage asfdoc_samb_uart_dma_use_case
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*
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* \page asfdoc_samb_uart_document_revision_history Document Revision History
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*
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* <table>
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* <tr>
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* <th>Doc. Rev.</td>
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* <th>Date</td>
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* <th>Comments</td>
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* </tr>
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* <tr>
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* <td>A</td>
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* <td>09/2015</td>
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* <td>Initial release</td>
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* </tr>
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* </table>
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*/
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#endif
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