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364 lines
14 KiB
364 lines
14 KiB
/**
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* @file
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* @brief This files defines the driver API including definitions, data types
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* and function prototypes.
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*/
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/* ****************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2019-10-07 11:05:30 -0500 (Mon, 07 Oct 2019) $
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* $Revision: 47429 $
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*
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*************************************************************************** */
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#ifndef _UART_H_
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#define _UART_H_
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/***** Includes *****/
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#include <stdint.h>
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#include "uart_regs.h"
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#include "mxc_sys.h"
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/***** Definitions *****/
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/**
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* @brief Alternate clock rate. (7.3728MHz) */
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#define UART_ALTERNATE_CLOCK_HZ 7372800
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/**
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* @defgroup uart UART
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* @ingroup periphlibs
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* @{
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*/
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/**
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* @brief Parity settings type */
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typedef enum {
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UART_PARITY_DISABLE = 0, /**< Parity disabled */
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UART_PARITY_EVEN_0 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_EVEN |
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MXC_F_UART_CTRL_PARMD), /**< Use for even parity 0 */
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UART_PARITY_EVEN_1 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_EVEN), /**< Use for even parity 1 */
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UART_PARITY_EVEN = UART_PARITY_EVEN_1, /**< Conventional even parity */
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UART_PARITY_ODD_0 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_ODD |
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MXC_F_UART_CTRL_PARMD), /**< Use for odd parity 0 */
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UART_PARITY_ODD_1 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_ODD), /**< Use for odd parity 1 */
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UART_PARITY_ODD = UART_PARITY_ODD_1, /**< Conventional odd parity */
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UART_PARITY_MARK_0 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_MARK |
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MXC_F_UART_CTRL_PARMD), /**< Use for mark parity 0 */
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UART_PARITY_MARK_1 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_MARK), /**< Use for mark parity 1 */
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UART_PARITY_MARK = UART_PARITY_MARK_1, /**< Conventional mark parity */
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UART_PARITY_SPACE_0 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_SPACE |
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MXC_F_UART_CTRL_PARMD), /**< Use for space parity 0 */
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UART_PARITY_SPACE_1 = (MXC_F_UART_CTRL_PARITY_EN |
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MXC_S_UART_CTRL_PARITY_SPACE), /**< Use for space parity 1 */
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UART_PARITY_SPACE = UART_PARITY_SPACE_1, /**< Conventional space parity */
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} uart_parity_t;
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/**
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* @brief Message size settings */
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typedef enum {
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UART_DATA_SIZE_5_BITS = MXC_S_UART_CTRL_CHAR_SIZE_5, /**< Data Size 5 Bits */
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UART_DATA_SIZE_6_BITS = MXC_S_UART_CTRL_CHAR_SIZE_6, /**< Data Size 6 Bits */
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UART_DATA_SIZE_7_BITS = MXC_S_UART_CTRL_CHAR_SIZE_7, /**< Data Size 7 Bits */
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UART_DATA_SIZE_8_BITS = MXC_S_UART_CTRL_CHAR_SIZE_8, /**< Data Size 8 Bits */
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} uart_size_t;
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/**
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* @brief Stop bit settings */
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typedef enum {
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UART_STOP_1 = 0, /**< UART Stop 1 clock cycle */
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UART_STOP_1P5 = MXC_F_UART_CTRL_STOPBITS, /**< UART Stop 1.5 clock cycle */
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UART_STOP_2 = MXC_F_UART_CTRL_STOPBITS, /**< UART Stop 2 clock cycle */
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} uart_stop_t;
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/**
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* @brief Flow control */
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typedef enum {
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UART_FLOW_CTRL_DIS = 0, /**< RTS/CTS flow is disabled */
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UART_FLOW_CTRL_EN = MXC_F_UART_CTRL_FLOW_CTRL, /**< RTS/CTS flow is enabled */
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} uart_flow_ctrl_t;
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/**
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* @brief Flow control Polarity */
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typedef enum {
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UART_FLOW_POL_DIS = 0, /**< RTS/CTS asserted is low */
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UART_FLOW_POL_EN = MXC_F_UART_CTRL_FLOW_POL, /**< RTS/CTS asserted is high */
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} uart_flow_pol_t;
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#if (TARGET != 32660)
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/**
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* @brief Clock Source Select */
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typedef enum {
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UART_CLKSEL_SYSTEM = 0, /**< Peripheral clock will be used as the bit rate clock */
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UART_CLKSEL_ALTERNATE = MXC_F_UART_CTRL_CLKSEL, /**< Use the device's alternate UART bit rate clock. */
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} uart_clksel_t;
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#endif
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/**
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* @brief UART configuration type. */
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typedef struct {
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uart_parity_t parity; /** Configure parity checking */
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uart_size_t size; /** Configure character size */
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uart_stop_t stop; /** Configure the number of stop bits to use */
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uart_flow_ctrl_t flow; /** Configure hardware flow control */
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uart_flow_pol_t pol; /** Configure hardware flow control */
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uint32_t baud; /** Configure baud rate */
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#if (TARGET != 32660)
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uart_clksel_t clksel; /** Configure hardware clock source */
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#endif
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} uart_cfg_t;
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/**
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* @brief Non-blocking UART transaction request. */
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typedef struct uart_req uart_req_t;
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struct uart_req {
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uint8_t *data; /** Data buffer for characters */
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int len; /** Length of characters in data to send or receive */
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int num; /** Number of characters actually sent or received */
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/**
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* @brief Callback for asynchronous request.
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*
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* @param uart_req_t* Pointer to the transaction request.
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* @param int Error code.
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*
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*/
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void(*callback)(uart_req_t*, int);
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};
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/***** Functions Prototypes *****/
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/**
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* @brief Initialize and enable UART module.
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* @param uart Pointer to the UART registers.
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* @param cfg Pointer to UART configuration.
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* @param sys_cfg Pointer to system configuration object
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* @returns #E_NO_ERROR UART initialized successfully, @ref MXC_Error_Codes "error" if
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* unsuccessful.
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*/
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int UART_Init(mxc_uart_regs_t *uart, const uart_cfg_t *cfg, const sys_cfg_uart_t* sys_cfg);
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/**
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* @brief Shutdown UART module.
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* @param uart Pointer to the UART registers.
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* @returns #E_NO_ERROR UART shutdown successfully, @ref MXC_Error_Codes "error" if
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* unsuccessful.
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*/
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int UART_Shutdown(mxc_uart_regs_t *uart);
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/**
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* @brief UART interrupt handler.
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* @details This function should be called by the application from the
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* interrupt handler if UART interrupts are enabled. Alternately,
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* this function can be periodically called by the application if
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* UART interrupts are disabled. It is only necessary to call this
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* when using asynchronous functions.
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*
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* @param uart Pointer to the UART registers.
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*/
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void UART_Handler(mxc_uart_regs_t *uart);
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/**
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* @brief Read UART data, <em>blocking</em> until transaction is complete.
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*
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* @param uart Pointer to the UART registers.
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* @param data Pointer to buffer to save the data read.
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* @param len Number of bytes to read.
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* @param num Pointer to store the number of bytes actually read, pass NULL if not needed.
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*
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* @return Number of bytes read, @ref MXC_Error_Codes "error" if unsuccessful.
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*/
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int UART_Read(mxc_uart_regs_t *uart, uint8_t *data, int len, int *num);
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/**
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* @brief Write UART data. This function blocks until the write transaction
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* is complete.
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* @param uart Pointer to the UART registers.
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* @param data Pointer to buffer for write data.
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* @param len Number of bytes to write.
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* @note This function will return once data has been put into FIFO, not necessarily
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* transmitted.
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* @return Number of bytes written if successful, @ref MXC_Error_Codes "error" if unsuccessful.
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*/
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int UART_Write(mxc_uart_regs_t *uart, const uint8_t *data, int len);
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/**
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* @brief Asynchronously read UART data.
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*
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* @param uart Pointer to the UART registers.
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* @param req Pointer to request for a UART transaction, see #uart_req.
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* @note Request struct must remain allocated until callback function specified in 'req' is called.
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*
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* @return #E_NO_ERROR Asynchronous read successfully started, @ref MXC_Error_Codes "error" if unsuccessful.
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*/
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int UART_ReadAsync(mxc_uart_regs_t *uart, uart_req_t *req);
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/**
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* @brief Asynchronously write/transmit UART data.
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*
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* @param uart Pointer to the UART registers.
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* @param req Request for a UART transaction, see #uart_req.
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* @note Request struct must remain allocated until callback function specified in 'req' is called.
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*
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* @return #E_NO_ERROR Asynchronous write successfully started, @ref
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* MXC_Error_Codes "error" if unsuccessful.
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*/
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int UART_WriteAsync(mxc_uart_regs_t *uart, uart_req_t *req);
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/**
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* @brief Read a single byte from the UART.
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* @note This function will block until a character is available.
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*
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* @param uart Pointer to the UART registers.
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* @return The byte read.
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*/
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uint8_t UART_ReadByte(mxc_uart_regs_t *uart);
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/**
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* @brief Write one byte at a time to the UART.
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* @note This function will block until the character has been placed in the transmit FIFO.
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* It may return before the character is actually transmitted.
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*
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* @param uart Pointer to the UART registers.
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* @param data The byte to write.
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*/
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void UART_WriteByte(mxc_uart_regs_t *uart, uint8_t data);
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/**
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* @brief Check to see if the UART is busy.
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*
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* @param uart Pointer to the UART registers.
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*
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* @return #E_NO_ERROR if the UART is idle, #E_BUSY if the UART is in use.
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*/
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int UART_Busy(mxc_uart_regs_t *uart);
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/**
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* @brief Prepare the UART for entry into a Low-Power mode (DEEPSLEEP/BACKUP).
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* @details Checks for any ongoing transactions. Disables interrupts if the
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* UART is idle.
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*
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* @param uart Pointer to the UART registers.
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* @return #E_NO_ERROR UART is ready to enter Low-Power modes (DEEPSLEEP/BACKUP).
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* @return #E_BUSY UART is active and busy and not ready to enter a
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* Low-Power mode (DEEPSLEEP/BACKUP).
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*
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*/
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int UART_PrepForSleep(mxc_uart_regs_t *uart);
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/**
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* @brief Abort asynchronous request.
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*
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* @param req Pointer to the request to abort. See #uart_req.
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*
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* @return #E_NO_ERROR if the asynchronous request aborted successfully started, @ref
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* MXC_Error_Codes "error" if unsuccessful.
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*/
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int UART_AbortAsync(uart_req_t *req);
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/**
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* @brief Returns the number of bytes still pending transmission in the UART TX FIFO.
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*
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* @param uart Pointer to the UART registers.
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*
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* @return Number of unused bytes in the TX FIFO.
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*/
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unsigned UART_NumWriteAvail(mxc_uart_regs_t *uart);
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/**
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* @brief Returns the number of bytes available to be read from the RX FIFO.
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*
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* @param uart Pointer to the UART registers.
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*
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* @return The number of bytes available to read in the RX FIFO.
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*/
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unsigned UART_NumReadAvail(mxc_uart_regs_t *uart);
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/**
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* @brief Clears the specified interrupt flags.
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*
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* @param uart Pointer to the UART registers.
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* @param mask Mask of the UART interrupts to clear, see
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* @ref UART_INT_FL Register.
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*/
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void UART_ClearFlags(mxc_uart_regs_t *uart, uint32_t mask);
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/**
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* @brief Get the UART interrupt flags.
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*
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* @param uart Pointer to the UART registers.
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*
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* @return Mask of active flags.
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*/
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unsigned UART_GetFlags(mxc_uart_regs_t *uart);
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/**
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* @brief Enables the UART.
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* @note This function does not change the existing UART configuration.
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*
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* @param uart Pointer to the UART registers.
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*/
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void UART_Enable(mxc_uart_regs_t *uart);
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/**
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* @brief Disables the UART.
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* @note This function does not change the existing UART configuration.
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*
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* @param uart Pointer to the UART registers.
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*/
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void UART_Disable(mxc_uart_regs_t *uart);
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/**
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* @brief Drains/empties and data in the RX FIFO, discarding any bytes not yet consumed.
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*
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* @param uart Pointer to the UART registers.
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*/
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void UART_DrainRX(mxc_uart_regs_t *uart);
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/**
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* @brief Drains/empties any data in the TX FIFO, discarding any bytes not yet transmitted.
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*
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* @param uart Pointer to the UART registers.
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*/
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void UART_DrainTX(mxc_uart_regs_t *uart);
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/**@} end of group uart */
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#endif /* _UART_H_ */
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