mirror of
https://gitea.osmocom.org/sim-card/simtrace2.git
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3f5e3ddffc
This way we can easily check with 'diff' for differences in our code and Atmel softpack. Also, this layout is more suitable for building various different firmware images (e.g. factory-test, dfu-loader, main application) for a variety of different boards (simtrace, owhw, qmod).
411 lines
12 KiB
C
411 lines
12 KiB
C
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2009, Atmel Corporation
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*
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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 disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/** \addtogroup usart_module Working with USART
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* The USART driver provides the interface to configure and use the USART peripheral.\n
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*
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* The USART supports several kinds of comminication modes such as full-duplex asynchronous/
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* synchronous serial commnunication,RS485 with driver control signal,ISO7816,SPI and Test modes.
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*
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* To start a USART transfer with \ref AT91SAM3S_PDC "PDC" support, the user could follow these steps:
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* <ul>
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* <li> Configure USART with expected mode and baudrate(see \ref USART_Configure), which could be done by:
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* -# Resetting and disabling transmitter and receiver by setting US_CR(Control Register). </li>
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* -# Conifguring the USART in a specific mode by setting USART_MODE bits in US_MR(Mode Register) </li>
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* -# Setting baudrate which is different from mode to mode.
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</li>
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* <li> Enable transmitter or receiver respectively by set US_CR_TXEN or US_CR_RXEN in US_CR.</li>
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* <li> Read from or write to the peripheral with \ref USART_ReadBuffer or \ref USART_WriteBuffer.
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These operations could be done by polling or interruption. </li>
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* <li> For polling, check the status bit US_CSR_ENDRX/US_CSR_RXBUFF (READ) or US_CSR_ENDTX/
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US_CSR_TXBUFE (WRITE). </li>
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* <li> For interruption,"enable" the status bit through US_IER and
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realize the hanler with USARTx_IrqHandler according to IRQ vector
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table which is defined in board_cstartup_<toolchain>.c
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To enable the interruption of USART,it should be configured with priority and enabled first through
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NVIC .</li>
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* </ul>
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*
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* For more accurate information, please look at the USART section of the
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* Datasheet.
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*
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* Related files :\n
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* \ref usart.c\n
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* \ref usart.h\n
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*/
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/**
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* \file
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*
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* Implementation of USART (Universal Synchronous Asynchronous Receiver Transmitter)
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* controller.
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*
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*/
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/*------------------------------------------------------------------------------
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* Headers
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*------------------------------------------------------------------------------*/
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#include "chip.h"
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#include "trace.h"
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#include <assert.h>
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#include <string.h>
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/*----------------------------------------------------------------------------
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* Local definitions
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*----------------------------------------------------------------------------*/
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/*------------------------------------------------------------------------------
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* Exported functions
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*------------------------------------------------------------------------------*/
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/**
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* \brief Configures an USART peripheral with the specified parameters.
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*
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*
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* \param usart Pointer to the USART peripheral to configure.
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* \param mode Desired value for the USART mode register (see the datasheet).
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* \param baudrate Baudrate at which the USART should operate (in Hz).
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* \param masterClock Frequency of the system master clock (in Hz).
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*/
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void USART_Configure(Usart *usart,
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uint32_t mode,
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uint32_t baudrate,
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uint32_t masterClock)
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{
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/* Reset and disable receiver & transmitter*/
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usart->US_CR = US_CR_RSTRX | US_CR_RSTTX
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| US_CR_RXDIS | US_CR_TXDIS;
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/* Configure mode*/
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usart->US_MR = mode;
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/* Configure baudrate*/
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/* Asynchronous, no oversampling*/
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if ( ((mode & US_MR_SYNC) == 0) && ((mode & US_MR_OVER) == 0) )
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{
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usart->US_BRGR = (masterClock / baudrate) / 16;
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}
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if( ((mode & US_MR_USART_MODE_SPI_MASTER) == US_MR_USART_MODE_SPI_MASTER)
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|| ((mode & US_MR_SYNC) == US_MR_SYNC))
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{
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if( (mode & US_MR_USCLKS_Msk) == US_MR_USCLKS_MCK)
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{
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usart->US_BRGR = masterClock / baudrate;
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}
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else
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{
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if ( (mode & US_MR_USCLKS_DIV) == US_MR_USCLKS_DIV)
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{
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usart->US_BRGR = masterClock / baudrate / 8;
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}
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}
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}
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/* TODO other modes*/
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}
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/**
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* \brief Enables or disables the transmitter of an USART peripheral.
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*
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*
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* \param usart Pointer to an USART peripheral
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* \param enabled If true, the transmitter is enabled; otherwise it is
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* disabled.
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*/
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void USART_SetTransmitterEnabled(Usart *usart, uint8_t enabled)
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{
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if (enabled) {
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usart->US_CR = US_CR_TXEN;
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}
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else {
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usart->US_CR = US_CR_TXDIS;
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}
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}
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/**
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* \brief Enables or disables the receiver of an USART peripheral
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*
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*
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* \param usart Pointer to an USART peripheral
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* \param enabled If true, the receiver is enabled; otherwise it is disabled.
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*/
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void USART_SetReceiverEnabled(Usart *usart,
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uint8_t enabled)
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{
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if (enabled) {
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usart->US_CR = US_CR_RXEN;
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}
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else {
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usart->US_CR = US_CR_RXDIS;
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}
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}
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/**
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* \brief Sends one packet of data through the specified USART peripheral. This
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* function operates synchronously, so it only returns when the data has been
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* actually sent.
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*
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*
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* \param usart Pointer to an USART peripheral.
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* \param data Data to send including 9nth bit and sync field if necessary (in
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* the same format as the US_THR register in the datasheet).
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* \param timeOut Time out value (0 = no timeout).
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*/
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void USART_Write(
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Usart *usart,
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uint16_t data,
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volatile uint32_t timeOut)
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{
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if (timeOut == 0) {
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while ((usart->US_CSR & US_CSR_TXEMPTY) == 0);
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}
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else {
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while ((usart->US_CSR & US_CSR_TXEMPTY) == 0) {
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if (timeOut == 0) {
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TRACE_ERROR("USART_Write: Timed out.\n\r");
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return;
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}
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timeOut--;
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}
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}
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usart->US_THR = data;
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}
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/**
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* \brief Sends the contents of a data buffer through the specified USART peripheral.
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* This function returns immediately (1 if the buffer has been queued, 0
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* otherwise); poll the ENDTX and TXBUFE bits of the USART status register
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* to check for the transfer completion.
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*
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* \param usart Pointer to an USART peripheral.
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* \param buffer Pointer to the data buffer to send.
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* \param size Size of the data buffer (in bytes).
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*/
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uint8_t USART_WriteBuffer(
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Usart *usart,
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void *buffer,
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uint32_t size)
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{
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/* Check if the first PDC bank is free*/
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if ((usart->US_TCR == 0) && (usart->US_TNCR == 0)) {
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usart->US_TPR = (uint32_t) buffer;
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usart->US_TCR = size;
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usart->US_PTCR = US_PTCR_TXTEN;
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return 1;
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}
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/* Check if the second PDC bank is free*/
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else if (usart->US_TNCR == 0) {
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usart->US_TNPR = (uint32_t) buffer;
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usart->US_TNCR = size;
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return 1;
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}
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else {
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return 0;
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}
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}
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/**
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* \brief Reads and return a packet of data on the specified USART peripheral. This
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* function operates asynchronously, so it waits until some data has been
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* received.
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*
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* \param usart Pointer to an USART peripheral.
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* \param timeOut Time out value (0 -> no timeout).
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*/
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uint16_t USART_Read(
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Usart *usart,
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volatile uint32_t timeOut)
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{
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if (timeOut == 0) {
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while ((usart->US_CSR & US_CSR_RXRDY) == 0);
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}
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else {
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while ((usart->US_CSR & US_CSR_RXRDY) == 0) {
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if (timeOut == 0) {
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TRACE_ERROR( "USART_Read: Timed out.\n\r" ) ;
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return 0;
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}
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timeOut--;
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}
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}
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return usart->US_RHR;
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}
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/**
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* \brief Reads data from an USART peripheral, filling the provided buffer until it
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* becomes full. This function returns immediately with 1 if the buffer has
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* been queued for transmission; otherwise 0.
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*
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* \param usart Pointer to an USART peripheral.
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* \param buffer Pointer to the buffer where the received data will be stored.
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* \param size Size of the data buffer (in bytes).
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*/
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uint8_t USART_ReadBuffer(Usart *usart,
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void *buffer,
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uint32_t size)
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{
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/* Check if the first PDC bank is free*/
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if ((usart->US_RCR == 0) && (usart->US_RNCR == 0)) {
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usart->US_RPR = (uint32_t) buffer;
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usart->US_RCR = size;
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usart->US_PTCR = US_PTCR_RXTEN;
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return 1;
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}
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/* Check if the second PDC bank is free*/
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else if (usart->US_RNCR == 0) {
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usart->US_RNPR = (uint32_t) buffer;
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usart->US_RNCR = size;
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return 1;
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}
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else {
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return 0;
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}
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}
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/**
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* \brief Returns 1 if some data has been received and can be read from an USART;
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* otherwise returns 0.
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*
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* \param usart Pointer to an Usart instance.
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*/
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uint8_t USART_IsDataAvailable(Usart *usart)
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{
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if ((usart->US_CSR & US_CSR_RXRDY) != 0) {
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return 1;
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}
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else {
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return 0;
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}
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}
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/**
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* \brief Sets the filter value for the IRDA demodulator.
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*
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* \param pUsart Pointer to an Usart instance.
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* \param filter Filter value.
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*/
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void USART_SetIrdaFilter(Usart *pUsart, uint8_t filter)
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{
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assert( pUsart != NULL ) ;
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pUsart->US_IF = filter;
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}
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/**
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* \brief Sends one packet of data through the specified USART peripheral. This
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* function operates synchronously, so it only returns when the data has been
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* actually sent.
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*
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* \param usart Pointer to an USART peripheral.
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* \param c Character to send
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*/
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void USART_PutChar(
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Usart *usart,
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uint8_t c)
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{
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/* Wait for the transmitter to be ready*/
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while ((usart->US_CSR & US_CSR_TXEMPTY) == 0);
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/* Send character*/
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usart->US_THR = c;
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/* Wait for the transfer to complete*/
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while ((usart->US_CSR & US_CSR_TXEMPTY) == 0);
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}
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/**
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* \brief Return 1 if a character can be read in USART
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*/
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uint32_t USART_IsRxReady(Usart *usart)
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{
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return (usart->US_CSR & US_CSR_RXRDY);
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}
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/**
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* \brief Get present status
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*/
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uint32_t USART_GetStatus(Usart *usart)
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{
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return usart->US_CSR;
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}
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/**
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* \brief Enable interrupt
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*/
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void USART_EnableIt(Usart *usart,uint32_t mode)
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{
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usart->US_IER = mode;
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}
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/**
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* \brief Disable interrupt
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*/
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void USART_DisableIt(Usart *usart,uint32_t mode)
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{
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usart->US_IDR = mode;
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}
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/**
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* \brief Reads and returns a character from the USART.
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*
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* \note This function is synchronous (i.e. uses polling).
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* \param usart Pointer to an USART peripheral.
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* \return Character received.
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*/
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uint8_t USART_GetChar(Usart *usart)
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{
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while ((usart->US_CSR & US_CSR_RXRDY) == 0);
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return usart->US_RHR;
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}
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