144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/*
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* Copyright (c) 2018, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may 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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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc13xx-cc26xx-uart
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* @{
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*
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* \file
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* Implementation of UART driver for CC13xx/CC26xx.
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* \author
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* Edvard Pettersen <e.pettersen@ti.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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/*---------------------------------------------------------------------------*/
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#include "uart0-arch.h"
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/*---------------------------------------------------------------------------*/
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#include <Board.h>
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#include <ti/drivers/UART.h>
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/*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <stdbool.h>
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/*---------------------------------------------------------------------------*/
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static UART_Handle uart_handle;
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static volatile uart0_input_fxn_t curr_input_cb;
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static unsigned char char_buf;
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static bool initialized;
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/*---------------------------------------------------------------------------*/
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static void
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uart0_cb(UART_Handle handle, void *buf, size_t count)
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{
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/* Simply return if the current callback is NULL. */
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if(!curr_input_cb) {
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return;
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}
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/*
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* Save the current callback function locally, as it might be overwritten
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* after calling the callback.
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*/
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const uart0_input_fxn_t curr_cb = curr_input_cb;
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curr_cb(char_buf);
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/*
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* If curr_input_cb didn't change after the call, do another read.
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* Else, the uart0_set_callback was called with a different callback pointer
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* and triggered an another read.
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*/
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if(curr_cb == curr_input_cb) {
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UART_read(uart_handle, &char_buf, 1);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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uart0_init(void)
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{
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if(initialized) {
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return;
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}
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UART_Params uart_params;
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UART_Params_init(&uart_params);
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uart_params.baudRate = TI_UART_CONF_BAUD_RATE;
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uart_params.readMode = UART_MODE_CALLBACK;
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uart_params.writeMode = UART_MODE_BLOCKING;
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uart_params.readCallback = uart0_cb;
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uart_params.readDataMode = UART_DATA_TEXT;
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uart_params.readReturnMode = UART_RETURN_NEWLINE;
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/* No error handling. */
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uart_handle = UART_open(Board_UART0, &uart_params);
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initialized = true;
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}
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/*---------------------------------------------------------------------------*/
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int_fast32_t
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uart0_write(const void *buf, size_t buf_size)
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{
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if(!initialized) {
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return UART_STATUS_ERROR;
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}
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return UART_write(uart_handle, buf, buf_size);
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}
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/*---------------------------------------------------------------------------*/
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int_fast32_t
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uart0_write_byte(uint8_t byte)
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{
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if(!initialized) {
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return UART_STATUS_ERROR;
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}
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return UART_write(uart_handle, &byte, 1);
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}
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/*---------------------------------------------------------------------------*/
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int_fast32_t
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uart0_set_callback(uart0_input_fxn_t input_cb)
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{
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if(!initialized) {
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return UART_STATUS_ERROR;
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}
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if(curr_input_cb == input_cb) {
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return UART_STATUS_SUCCESS;
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}
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curr_input_cb = input_cb;
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if(input_cb) {
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return UART_read(uart_handle, &char_buf, 1);
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} else {
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UART_readCancel(uart_handle);
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return UART_STATUS_SUCCESS;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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