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

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/*
* Copyright (c) 2014, Texas Instruments Incorporated - http://www.ti.com/
* 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.
* 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 cc26xx-uart
* @{
*
* \file
* Implementation of the CC13xx/CC26xx UART driver.
*/
/*---------------------------------------------------------------------------*/
#include <Board.h>
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#include <ti/drivers/UART.h>
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/*---------------------------------------------------------------------------*/
#include <contiki.h>
/*---------------------------------------------------------------------------*/
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#include <stdint.h>
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#include <stdbool.h>
/*---------------------------------------------------------------------------*/
#include "uart0-arch.h"
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/*---------------------------------------------------------------------------*/
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static UART_Handle gh_uart;
static volatile uart0_input_cb g_input_cb;
static unsigned char g_char_buf;
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static bool g_bIsInit = false;
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/*---------------------------------------------------------------------------*/
static void
uart0_cb(UART_Handle handle, void *buf, size_t count)
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{
if (!g_input_cb) { return; }
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/*
* Save the current callback function, as this might be overwritten after
* the callback is called.
*/
const uart0_input_cb currCb = g_input_cb;
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/* Call the callback. Note this might reset g_input_cb */
currCb(g_char_buf);
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/*
* If g_input_cb didn't change after the call, do another read.
* Else, the uart0_set_callback was called with a different callback pointer
* and triggered an another read.
*/
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if (currCb == g_input_cb) {
UART_read(gh_uart, &g_char_buf, 1);
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}
}
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/*---------------------------------------------------------------------------*/
void
uart0_init(void)
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{
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if (g_bIsInit) { return; }
g_bIsInit = true;
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UART_Params params;
UART_Params_init(&params);
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params.baudRate = TI_UART_CONF_BAUD_RATE;
params.readMode = UART_MODE_CALLBACK;
params.writeMode = UART_MODE_BLOCKING;
params.readCallback = uart0_cb;
params.readDataMode = UART_DATA_TEXT;
params.readReturnMode = UART_RETURN_NEWLINE;
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gh_uart = UART_open(Board_UART0, &params);
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}
/*---------------------------------------------------------------------------*/
int_fast32_t
uart0_write(const void *buffer, size_t size)
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{
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if (!g_bIsInit) {
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return UART_STATUS_ERROR;
}
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return UART_write(gh_uart, buffer, size);
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}
/*---------------------------------------------------------------------------*/
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int_fast32_t
uart0_set_callback(uart0_input_cb input_cb)
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{
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if (!g_bIsInit) {
return UART_STATUS_ERROR;
}
if (g_input_cb == input_cb) {
return UART_STATUS_SUCCESS;
}
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g_input_cb = input_cb;
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if (input_cb) {
return UART_read(gh_uart, &g_char_buf, 1);
} else {
UART_readCancel(gh_uart);
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return UART_STATUS_SUCCESS;
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}
}
/*---------------------------------------------------------------------------*/
/** @} */