225 lines
8.8 KiB
C
225 lines
8.8 KiB
C
/****************************************************************************************
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| Description: bootloader UART communication interface source file
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| File Name: uart.c
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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) 2012 by Feaser http://www.feaser.com All rights reserved
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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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| 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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| You should have received a copy of the GNU General Public License along with OpenBLT.
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| If not, see <http://www.gnu.org/licenses/>.
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| A special exception to the GPL is included to allow you to distribute a combined work
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| that includes OpenBLT without being obliged to provide the source code for any
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| proprietary components. The exception text is included at the bottom of the license
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| file <license.html>.
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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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#include "efm32.h"
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#include "efm32_cmu.h"
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#include "efm32_gpio.h"
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#include "efm32_leuart.h"
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#if (BOOT_COM_UART_ENABLE > 0)
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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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** NAME: UartInit
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** PARAMETER: none
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** RETURN VALUE: none
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** DESCRIPTION: Initializes the UART communication interface
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**
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****************************************************************************************/
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void UartInit(void)
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{
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LEUART_Init_TypeDef init = LEUART_INIT_DEFAULT;
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/* currently, only LEUART1 is supported */
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ASSERT_CT(BOOT_COM_UART_CHANNEL_INDEX == 1);
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/* max baudrate for LEUART is 9600 bps */
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ASSERT_CT(BOOT_COM_UART_BAUDRATE <= 9600);
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/* configure GPIO pins */
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CMU_ClockEnable(cmuClock_GPIO, true);
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/* to avoid false start, configure output as high */
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GPIO_PinModeSet(gpioPortC, 6, gpioModePushPull, 1);
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GPIO_PinModeSet(gpioPortC, 7, gpioModeInput, 0);
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/* enable CORE LE clock in order to access LE modules */
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CMU_ClockEnable(cmuClock_CORELE, true);
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/* select LFXO for LEUARTs (and wait for it to stabilize) */
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CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO);
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/* do not prescale clock */
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CMU_ClockDivSet(cmuClock_LEUART1, cmuClkDiv_1);
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/* enable LEUART1 clock */
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CMU_ClockEnable(cmuClock_LEUART1, true);
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/* configure LEUART */
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init.enable = leuartDisable;
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LEUART_Init(LEUART1, &init);
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LEUART_BaudrateSet(LEUART1, 0, BOOT_COM_UART_BAUDRATE);
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/* enable pins at default location */
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LEUART1->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN;
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/* clear previous RX interrupts */
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LEUART_IntClear(LEUART1, LEUART_IF_RXDATAV);
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/* finally enable it */
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LEUART_Enable(LEUART1, leuartEnable);
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} /*** end of UartInit ***/
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/****************************************************************************************
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** NAME: UartTransmitPacket
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** PARAMETER: data pointer to byte array with data that it to be transmitted.
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** len number of bytes that are to be transmitted.
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** RETURN VALUE: none
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** DESCRIPTION: Transmits a packet formatted for the communication interface.
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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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/* verify validity of the len-paramenter */
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ASSERT_RT(len <= BOOT_COM_TX_MAX_DATA);
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/* first transmit the length of the packet */
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ASSERT_RT(UartTransmitByte(len) == 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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ASSERT_RT(UartTransmitByte(data[data_index]) == BLT_TRUE);
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}
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} /*** end of UartTransmitPacket ***/
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/****************************************************************************************
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** NAME: UartReceivePacket
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** PARAMETER: data pointer to byte array where the data is to be stored.
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** RETURN VALUE: BLT_TRUE if a packet was received, BLT_FALSE otherwise.
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** DESCRIPTION: Receives a communication interface packet if one is present.
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**
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****************************************************************************************/
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blt_bool UartReceivePacket(blt_int8u *data)
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{
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static blt_int8u xcpCtoReqPacket[XCP_CTO_PACKET_LEN+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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/* 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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/* indicate that a cto packet is being received */
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xcpCtoRxInProgress = BLT_TRUE;
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/* reset packet data count */
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xcpCtoRxLength = 0;
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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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/* packet reception complete */
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return BLT_TRUE;
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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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** NAME: UartReceiveByte
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** PARAMETER: data pointer to byte where the data is to be stored.
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** RETURN VALUE: BLT_TRUE if a byte was received, BLT_FALSE otherwise.
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** DESCRIPTION: Receives a communication interface byte if one is present.
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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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blt_bool result = BLT_FALSE;
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/* check to see if a new bytes was received */
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if ((LEUART1->IF & LEUART_IF_RXDATAV) != 0)
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{
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/* store the received data byte and set return value to positive */
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*data = LEUART_Rx(LEUART1);
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result = BLT_TRUE;
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}
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/* inform caller about the result */
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return result;
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} /*** end of UartReceiveByte ***/
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/****************************************************************************************
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** NAME: UartTransmitByte
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** PARAMETER: data value of byte that is to be transmitted.
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** RETURN VALUE: BLT_TRUE if the byte was transmitted, BLT_FALSE otherwise.
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** DESCRIPTION: Transmits a communication interface byte.
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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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/* check if tx holding register can accept new data */
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if ((LEUART1->STATUS & LEUART_STATUS_TXBL) == 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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LEUART_Tx(LEUART1, data);
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/* wait for tx holding register to be empty */
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while((LEUART1->STATUS & LEUART_STATUS_TXBL) == 0)
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{
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/* keep the watchdog happy */
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CopService();
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}
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/* byte transmitted */
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return BLT_TRUE;
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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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