nes-proj/arch/cpu/cc13xx-cc26xx/dev/uart0-arch.c

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/*
* Copyright (c) 2018, Texas Instruments Incorporated - http://www.ti.com/
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* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* 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
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc13xx-cc26xx-uart
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* @{
*
* \file
* Implementation of UART driver for CC13xx/CC26xx.
* \author
* Edvard Pettersen <e.pettersen@ti.com>
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*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
/*---------------------------------------------------------------------------*/
#include "uart0-arch.h"
/*---------------------------------------------------------------------------*/
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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>
/*---------------------------------------------------------------------------*/
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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/*---------------------------------------------------------------------------*/
static void
uart0_cb(UART_Handle handle, void *buf, size_t count)
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{
/* Simply return if the current callback is NULL. */
if(!curr_input_cb) { return; }
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/*
* Save the current callback function locally, as it might be overwritten
* after calling the callback.
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*/
const uart0_input_fxn_t curr_cb = curr_input_cb;
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
* and triggered an another read.
*/
if(curr_cb == curr_input_cb) {
UART_read(uart_handle, &char_buf, 1);
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}
}
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/*---------------------------------------------------------------------------*/
void
uart0_init(void)
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{
if(initialized) { return; }
UART_Params uart_params;
UART_Params_init(&uart_params);
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uart_params.baudRate = TI_UART_CONF_BAUD_RATE;
uart_params.readMode = UART_MODE_CALLBACK;
uart_params.writeMode = UART_MODE_BLOCKING;
uart_params.readCallback = uart0_cb;
uart_params.readDataMode = UART_DATA_TEXT;
uart_params.readReturnMode = UART_RETURN_NEWLINE;
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/* No error handling. */
uart_handle = UART_open(Board_UART0, &uart_params);
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initialized = true;
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}
/*---------------------------------------------------------------------------*/
int_fast32_t
uart0_write(const void *buf, size_t buf_size)
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{
if(!initialized) {
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return UART_STATUS_ERROR;
}
return UART_write(uart_handle, buf, buf_size);
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}
/*---------------------------------------------------------------------------*/
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int_fast32_t
uart0_set_callback(uart0_input_fxn_t input_cb)
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{
if(!initialized) {
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return UART_STATUS_ERROR;
}
if(curr_input_cb == input_cb) {
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return UART_STATUS_SUCCESS;
}
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curr_input_cb = input_cb;
if(input_cb) {
return UART_read(uart_handle, &char_buf, 1);
} else {
UART_readCancel(uart_handle);
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return UART_STATUS_SUCCESS;
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}
}
/*---------------------------------------------------------------------------*/
/** @} */