292 lines
12 KiB
C
292 lines
12 KiB
C
/************************************************************************************//**
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* \file Source\ARMCM3_STM32F1\uart.c
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* \brief Bootloader UART communication interface source file.
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* \ingroup Target_ARMCM3_STM32F1
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* \internal
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*----------------------------------------------------------------------------------------
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* C O P Y R I G H T
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*----------------------------------------------------------------------------------------
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* Copyright (c) 2011 by Feaser http://www.feaser.com All rights reserved
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*
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*----------------------------------------------------------------------------------------
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* L I C E N S E
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*----------------------------------------------------------------------------------------
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* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published by the Free
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* Software Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You have received a copy of the GNU General Public License along with OpenBLT. It
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* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
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*
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* \endinternal
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****************************************************************************************/
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/****************************************************************************************
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* Include files
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****************************************************************************************/
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#include "boot.h" /* bootloader generic header */
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#if (BOOT_COM_UART_ENABLE > 0)
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/****************************************************************************************
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* Type definitions
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****************************************************************************************/
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/** \brief UART register layout. */
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typedef struct
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{
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volatile blt_int16u SR; /**< status register */
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blt_int16u RESERVED0;
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volatile blt_int16u DR; /**< data register */
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blt_int16u RESERVED1;
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volatile blt_int16u BRR; /**< baudrate register */
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blt_int16u RESERVED2;
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volatile blt_int16u CR1; /**< control register 1 */
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blt_int16u RESERVED3;
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volatile blt_int16u CR2; /**< control register 2 */
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blt_int16u RESERVED4;
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volatile blt_int16u CR3; /**< control register 3 */
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blt_int16u RESERVED5;
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volatile blt_int16u GTPR; /**< guard time and prescale reg. */
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blt_int16u RESERVED6;
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} tUartRegs; /**< UART register layout type */
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/****************************************************************************************
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* Macro definitions
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****************************************************************************************/
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/** \brief Timeout time for the reception of a CTO packet. The timer is started upon
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* reception of the first packet byte.
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*/
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#define UART_CTO_RX_PACKET_TIMEOUT_MS (100u)
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/** \brief Timeout for transmitting a byte in milliseconds. */
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#define UART_BYTE_TX_TIMEOUT_MS (10u)
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/** \brief USART enable bit. */
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#define UART_BIT_UE ((blt_int16u)0x2000)
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/** \brief Transmitter enable bit. */
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#define UART_BIT_TE ((blt_int16u)0x0008)
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/** \brief Receiver enable bit. */
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#define UART_BIT_RE ((blt_int16u)0x0004)
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/** \brief Transmit data reg. empty bit. */
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#define UART_BIT_TXE ((blt_int16u)0x0080)
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/** \brief Read data reg. not empty bit. */
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#define UART_BIT_RXNE ((blt_int16u)0x0020)
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/****************************************************************************************
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* Register definitions
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****************************************************************************************/
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#if (BOOT_COM_UART_CHANNEL_INDEX == 0)
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/** \brief Set UART base address to USART1. */
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#define UARTx ((tUartRegs *) (blt_int32u)0x40013800)
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#elif (BOOT_COM_UART_CHANNEL_INDEX == 1)
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/** \brief Set UART base address to USART2. */
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#define UARTx ((tUartRegs *) (blt_int32u)0x40004400)
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#else
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/** \brief Set UART base address to USART1 by default. */
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#define UARTx ((tUartRegs *) (blt_int32u)0x40013800)
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#endif
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/****************************************************************************************
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* Function prototypes
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****************************************************************************************/
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static blt_bool UartReceiveByte(blt_int8u *data);
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static blt_bool UartTransmitByte(blt_int8u data);
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/************************************************************************************//**
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** \brief Initializes the UART communication interface.
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** \return none.
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**
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****************************************************************************************/
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void UartInit(void)
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{
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/* the current implementation supports USART1 and USART2. throw an assertion error in
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* case a different UART channel is configured.
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*/
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ASSERT_CT((BOOT_COM_UART_CHANNEL_INDEX == 0) || (BOOT_COM_UART_CHANNEL_INDEX == 1));
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/* first reset the UART configuration. note that this already configures the UART
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* for 1 stopbit, 8 databits and no parity.
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*/
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UARTx->BRR = 0;
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UARTx->CR1 = 0;
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UARTx->CR2 = 0;
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UARTx->CR3 = 0;
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UARTx->GTPR = 0;
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/* configure the baudrate, knowing that PCLKx is configured to be half of
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* BOOT_CPU_SYSTEM_SPEED_KHZ.
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*/
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UARTx->BRR = ((BOOT_CPU_SYSTEM_SPEED_KHZ/2)*(blt_int32u)1000)/BOOT_COM_UART_BAUDRATE;
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/* enable the UART including the transmitter and the receiver */
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UARTx->CR1 |= (UART_BIT_UE | UART_BIT_TE | UART_BIT_RE);
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} /*** end of UartInit ***/
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/************************************************************************************//**
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** \brief Transmits a packet formatted for the communication interface.
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** \param data Pointer to byte array with data that it to be transmitted.
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** \param len Number of bytes that are to be transmitted.
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** \return none.
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**
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****************************************************************************************/
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void UartTransmitPacket(blt_int8u *data, blt_int8u len)
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{
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blt_int16u data_index;
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blt_bool result;
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/* verify validity of the len-paramenter */
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ASSERT_RT(len <= BOOT_COM_UART_TX_MAX_DATA);
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/* first transmit the length of the packet */
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result = UartTransmitByte(len);
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ASSERT_RT(result == BLT_TRUE);
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/* transmit all the packet bytes one-by-one */
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for (data_index = 0; data_index < len; data_index++)
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{
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/* keep the watchdog happy */
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CopService();
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/* write byte */
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result = UartTransmitByte(data[data_index]);
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ASSERT_RT(result == BLT_TRUE);
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}
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} /*** end of UartTransmitPacket ***/
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/************************************************************************************//**
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** \brief Receives a communication interface packet if one is present.
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** \param data Pointer to byte array where the data is to be stored.
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** \param len Pointer where the length of the packet is to be stored.
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** \return BLT_TRUE if a packet was received, BLT_FALSE otherwise.
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**
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****************************************************************************************/
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blt_bool UartReceivePacket(blt_int8u *data, blt_int8u *len)
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{
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static blt_int8u xcpCtoReqPacket[BOOT_COM_UART_RX_MAX_DATA+1]; /* one extra for length */
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static blt_int8u xcpCtoRxLength;
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static blt_bool xcpCtoRxInProgress = BLT_FALSE;
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static blt_int32u xcpCtoRxStartTime = 0;
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/* start of cto packet received? */
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if (xcpCtoRxInProgress == BLT_FALSE)
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{
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/* store the message length when received */
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if (UartReceiveByte(&xcpCtoReqPacket[0]) == BLT_TRUE)
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{
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if ( (xcpCtoReqPacket[0] > 0) &&
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(xcpCtoReqPacket[0] <= BOOT_COM_UART_RX_MAX_DATA) )
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{
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/* store the start time */
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xcpCtoRxStartTime = TimerGet();
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/* reset packet data count */
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xcpCtoRxLength = 0;
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/* indicate that a cto packet is being received */
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xcpCtoRxInProgress = BLT_TRUE;
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}
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}
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}
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else
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{
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/* store the next packet byte */
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if (UartReceiveByte(&xcpCtoReqPacket[xcpCtoRxLength+1]) == BLT_TRUE)
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{
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/* increment the packet data count */
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xcpCtoRxLength++;
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/* check to see if the entire packet was received */
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if (xcpCtoRxLength == xcpCtoReqPacket[0])
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{
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/* copy the packet data */
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CpuMemCopy((blt_int32u)data, (blt_int32u)&xcpCtoReqPacket[1], xcpCtoRxLength);
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/* done with cto packet reception */
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xcpCtoRxInProgress = BLT_FALSE;
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/* set the packet length */
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*len = xcpCtoRxLength;
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/* packet reception complete */
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return BLT_TRUE;
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}
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}
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else
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{
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/* check packet reception timeout */
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if (TimerGet() > (xcpCtoRxStartTime + UART_CTO_RX_PACKET_TIMEOUT_MS))
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{
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/* cancel cto packet reception due to timeout. note that that automaticaly
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* discards the already received packet bytes, allowing the host to retry.
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*/
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xcpCtoRxInProgress = BLT_FALSE;
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}
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}
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}
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/* packet reception not yet complete */
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return BLT_FALSE;
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} /*** end of UartReceivePacket ***/
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/************************************************************************************//**
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** \brief Receives a communication interface byte if one is present.
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** \param data Pointer to byte where the data is to be stored.
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** \return BLT_TRUE if a byte was received, BLT_FALSE otherwise.
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**
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****************************************************************************************/
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static blt_bool UartReceiveByte(blt_int8u *data)
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{
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/* check if a new byte was received by means of the RDR-bit */
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if ((UARTx->SR & UART_BIT_RXNE) != 0)
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{
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/* store the received byte */
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data[0] = UARTx->DR;
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/* inform caller of the newly received byte */
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return BLT_TRUE;
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}
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/* inform caller that no new data was received */
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return BLT_FALSE;
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} /*** end of UartReceiveByte ***/
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/************************************************************************************//**
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** \brief Transmits a communication interface byte.
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** \param data Value of byte that is to be transmitted.
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** \return BLT_TRUE if the byte was transmitted, BLT_FALSE otherwise.
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**
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****************************************************************************************/
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static blt_bool UartTransmitByte(blt_int8u data)
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{
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blt_int32u timeout;
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blt_bool result = BLT_TRUE;
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/* check if tx holding register can accept new data */
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if ((UARTx->SR & UART_BIT_TXE) == 0)
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{
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/* UART not ready. should not happen */
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return BLT_FALSE;
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}
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/* write byte to transmit holding register */
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UARTx->DR = data;
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/* set timeout time to wait for transmit completion. */
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timeout = TimerGet() + UART_BYTE_TX_TIMEOUT_MS;
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/* wait for tx holding register to be empty */
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while ((UARTx->SR & UART_BIT_TXE) == 0)
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{
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/* keep the watchdog happy */
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CopService();
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/* break loop upon timeout. this would indicate a hardware failure. */
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if (TimerGet() > timeout)
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{
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result = BLT_FALSE;
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break;
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}
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}
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/* give the result back to the caller */
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return result;
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} /*** end of UartTransmitByte ***/
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#endif /* BOOT_COM_UART_ENABLE > 0 */
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/*********************************** end of uart.c *************************************/
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