125 lines
4.6 KiB
C
125 lines
4.6 KiB
C
/******************************************************************************
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* Software License Agreement
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*
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* Copyright (c) 2015-2016, Infineon Technologies AG
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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 are met:
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*
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* 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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* 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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* Neither the name of the copyright holders nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* To improve the quality of the software, users are encouraged to share
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* modifications, enhancements or bug fixes with Infineon Technologies AG
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* (dave@infineon.com).
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*
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*****************************************************************************/
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/**
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* @file uart.c
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* @date 30 July, 2016
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* @version 1.0.0
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*
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* @brief Implements service layer for UART communication <br>
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*
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* <b>Detailed description of file</b> <br>
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* The file implements functions for buffering received data, transmit data, provide event
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* flags etc.
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*
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* History
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*
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* 01 Jul 2014 Version 1.0.0 <br>
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* Initial version
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*/
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#include "uart.h"
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/*USIC channel configuration*/
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const XMC_UART_CH_CONFIG_t UART_channel_config =
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{
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.baudrate = 19200U,
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.data_bits = 8U,
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.frame_length = 8U,
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.stop_bits = 1U,
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.oversampling = 16U,
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.parity_mode = XMC_USIC_CH_PARITY_MODE_NONE
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};
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/*Transmit pin configuration*/
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const XMC_GPIO_CONFIG_t UART_tx_pin_config =
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{
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.mode = XMC_GPIO_MODE_OUTPUT_PUSH_PULL_ALT2,
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.output_level = XMC_GPIO_OUTPUT_LEVEL_HIGH,
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.output_strength = XMC_GPIO_OUTPUT_STRENGTH_STRONG_SOFT_EDGE
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};
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uint8_t UART_RX_Buffer[UART_RX_BUFF_SIZE];
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/*Initialization function to configure USIC 0 channel 0 as UART
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* using pins Rx=P1.4, Tx=P1.5 using FIFO for transmission and reception*/
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void UART_init(void)
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{
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XMC_GPIO_SetMode((XMC_GPIO_PORT_t *)PORT1_BASE, 4U, XMC_GPIO_MODE_INPUT_TRISTATE);
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/* Initialize USIC channel in UART mode*/
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XMC_UART_CH_Init(XMC_UART0_CH0, &UART_channel_config);
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/*Set input source path*/
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XMC_USIC_CH_SetInputSource(XMC_UART0_CH0, XMC_USIC_CH_INPUT_DX0, 1U);
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/*Configure transmit FIFO*/
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XMC_USIC_CH_TXFIFO_Configure(XMC_UART0_CH0,
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16U,
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XMC_USIC_CH_FIFO_SIZE_16WORDS,
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1U);
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/*Configure receive FIFO*/
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XMC_USIC_CH_RXFIFO_Configure(XMC_UART0_CH0,
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0U,
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XMC_USIC_CH_FIFO_SIZE_16WORDS,
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15U);
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/* Start UART */
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XMC_UART_CH_Start(XMC_UART0_CH0);
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/* Initialize UART TX pin */
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XMC_GPIO_Init((XMC_GPIO_PORT_t *)PORT1_BASE, 5U, &UART_tx_pin_config);
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}
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/*Function to transmit data using Tx FIFO.
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* The return value indicates the number of bytes actually transmitted*/
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uint32_t UART_Transmit(uint8_t * data, uint32_t count)
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{
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uint32_t data_index = 0;
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while((!XMC_USIC_CH_TXFIFO_IsFull(XMC_UART0_CH0)) && (data_index < count))
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{
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XMC_UART_CH_Transmit(XMC_UART0_CH0, (uint16_t)data[data_index]);
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data_index++;
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}
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return data_index;
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}
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/*Function checks if any data is received on the Rx FIFO.
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* It reads the data from Rx FIFO and stores it in UART_RX_Buffer*/
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uint32_t UART_CheckRxData(void)
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{
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uint32_t data_index = 0;
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while((!XMC_USIC_CH_RXFIFO_IsEmpty(XMC_UART0_CH0)) && (data_index < UART_RX_BUFF_SIZE))
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{
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UART_RX_Buffer[data_index] = (uint8_t)XMC_UART_CH_GetReceivedData(XMC_UART0_CH0);
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data_index++;
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}
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return data_index;
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}
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