244 lines
9.4 KiB
C
244 lines
9.4 KiB
C
/************************************************************************************//**
|
|
* \file Source\ARMCM3_LM3S\uart.c
|
|
* \brief Bootloader UART communication interface source file.
|
|
* \ingroup Target_ARMCM3_LM3S
|
|
* \internal
|
|
*----------------------------------------------------------------------------------------
|
|
* C O P Y R I G H T
|
|
*----------------------------------------------------------------------------------------
|
|
* Copyright (c) 2012 by Feaser http://www.feaser.com All rights reserved
|
|
*
|
|
*----------------------------------------------------------------------------------------
|
|
* L I C E N S E
|
|
*----------------------------------------------------------------------------------------
|
|
* This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation, either version 3 of the License, or (at your option) any later
|
|
* version.
|
|
*
|
|
* OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU General Public License for more details.
|
|
*
|
|
* You have received a copy of the GNU General Public License along with OpenBLT. It
|
|
* should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy.
|
|
*
|
|
* \endinternal
|
|
****************************************************************************************/
|
|
|
|
/****************************************************************************************
|
|
* Include files
|
|
****************************************************************************************/
|
|
#include "boot.h" /* bootloader generic header */
|
|
#include "inc/hw_memmap.h"
|
|
#include "inc/hw_types.h"
|
|
#if (BOOT_COM_UART_ENABLE > 0)
|
|
#include "driverlib/sysctl.h"
|
|
#include "driverlib/uartlib.h"
|
|
#endif
|
|
|
|
|
|
#if (BOOT_COM_UART_ENABLE > 0)
|
|
/****************************************************************************************
|
|
* Macro definitions
|
|
****************************************************************************************/
|
|
/** \brief Timeout time for the reception of a CTO packet. The timer is started upon
|
|
* reception of the first packet byte.
|
|
*/
|
|
#define UART_CTO_RX_PACKET_TIMEOUT_MS (100u)
|
|
/** \brief Timeout for transmitting a byte in milliseconds. */
|
|
#define UART_BYTE_TX_TIMEOUT_MS (10u)
|
|
|
|
|
|
/****************************************************************************************
|
|
* Function prototypes
|
|
****************************************************************************************/
|
|
static blt_bool UartReceiveByte(blt_int8u *data);
|
|
static blt_bool UartTransmitByte(blt_int8u data);
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Initializes the UART communication interface.
|
|
** \return none.
|
|
**
|
|
****************************************************************************************/
|
|
void UartInit(void)
|
|
{
|
|
/* the current implementation supports UART0. throw an assertion error in case a
|
|
* different UART channel is configured.
|
|
*/
|
|
ASSERT_CT(BOOT_COM_UART_CHANNEL_INDEX == 0);
|
|
/* enable the UART0 peripheral */
|
|
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
|
|
/* configure the UART0 baudrate and communication parameters */
|
|
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), BOOT_COM_UART_BAUDRATE,
|
|
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
|
|
UART_CONFIG_PAR_NONE));
|
|
} /*** end of UartInit ***/
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Transmits a packet formatted for the communication interface.
|
|
** \param data Pointer to byte array with data that it to be transmitted.
|
|
** \param len Number of bytes that are to be transmitted.
|
|
** \return none.
|
|
**
|
|
****************************************************************************************/
|
|
void UartTransmitPacket(blt_int8u *data, blt_int8u len)
|
|
{
|
|
blt_int16u data_index;
|
|
blt_bool result;
|
|
|
|
/* verify validity of the len-paramenter */
|
|
ASSERT_RT(len <= BOOT_COM_UART_TX_MAX_DATA);
|
|
|
|
/* first transmit the length of the packet */
|
|
result = UartTransmitByte(len);
|
|
ASSERT_RT(result == BLT_TRUE);
|
|
|
|
/* transmit all the packet bytes one-by-one */
|
|
for (data_index = 0; data_index < len; data_index++)
|
|
{
|
|
/* keep the watchdog happy */
|
|
CopService();
|
|
/* write byte */
|
|
result = UartTransmitByte(data[data_index]);
|
|
ASSERT_RT(result == BLT_TRUE);
|
|
}
|
|
} /*** end of UartTransmitPacket ***/
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Receives a communication interface packet if one is present.
|
|
** \param data Pointer to byte array where the data is to be stored.
|
|
** \param len Pointer where the length of the packet is to be stored.
|
|
** \return BLT_TRUE if a packet was received, BLT_FALSE otherwise.
|
|
**
|
|
****************************************************************************************/
|
|
blt_bool UartReceivePacket(blt_int8u *data, blt_int8u *len)
|
|
{
|
|
static blt_int8u xcpCtoReqPacket[BOOT_COM_UART_RX_MAX_DATA+1]; /* one extra for length */
|
|
static blt_int8u xcpCtoRxLength;
|
|
static blt_bool xcpCtoRxInProgress = BLT_FALSE;
|
|
static blt_int32u xcpCtoRxStartTime = 0;
|
|
|
|
/* start of cto packet received? */
|
|
if (xcpCtoRxInProgress == BLT_FALSE)
|
|
{
|
|
/* store the message length when received */
|
|
if (UartReceiveByte(&xcpCtoReqPacket[0]) == BLT_TRUE)
|
|
{
|
|
if ( (xcpCtoReqPacket[0] > 0) &&
|
|
(xcpCtoReqPacket[0] <= BOOT_COM_UART_RX_MAX_DATA) )
|
|
{
|
|
/* store the start time */
|
|
xcpCtoRxStartTime = TimerGet();
|
|
/* reset packet data count */
|
|
xcpCtoRxLength = 0;
|
|
/* indicate that a cto packet is being received */
|
|
xcpCtoRxInProgress = BLT_TRUE;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* store the next packet byte */
|
|
if (UartReceiveByte(&xcpCtoReqPacket[xcpCtoRxLength+1]) == BLT_TRUE)
|
|
{
|
|
/* increment the packet data count */
|
|
xcpCtoRxLength++;
|
|
|
|
/* check to see if the entire packet was received */
|
|
if (xcpCtoRxLength == xcpCtoReqPacket[0])
|
|
{
|
|
/* copy the packet data */
|
|
CpuMemCopy((blt_int32u)data, (blt_int32u)&xcpCtoReqPacket[1], xcpCtoRxLength);
|
|
/* done with cto packet reception */
|
|
xcpCtoRxInProgress = BLT_FALSE;
|
|
/* set the packet length */
|
|
*len = xcpCtoRxLength;
|
|
/* packet reception complete */
|
|
return BLT_TRUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* check packet reception timeout */
|
|
if (TimerGet() > (xcpCtoRxStartTime + UART_CTO_RX_PACKET_TIMEOUT_MS))
|
|
{
|
|
/* cancel cto packet reception due to timeout. note that that automaticaly
|
|
* discards the already received packet bytes, allowing the host to retry.
|
|
*/
|
|
xcpCtoRxInProgress = BLT_FALSE;
|
|
}
|
|
}
|
|
}
|
|
/* packet reception not yet complete */
|
|
return BLT_FALSE;
|
|
} /*** end of UartReceivePacket ***/
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Receives a communication interface byte if one is present.
|
|
** \param data Pointer to byte where the data is to be stored.
|
|
** \return BLT_TRUE if a byte was received, BLT_FALSE otherwise.
|
|
**
|
|
****************************************************************************************/
|
|
static blt_bool UartReceiveByte(blt_int8u *data)
|
|
{
|
|
blt_int32s result;
|
|
|
|
/* try to read a newly received byte */
|
|
result = UARTCharGetNonBlocking(UART0_BASE);
|
|
/* check if a new byte was received */
|
|
if (result != -1)
|
|
{
|
|
/* store the received byte */
|
|
data[0] = (blt_int8u)result;
|
|
/* inform caller of the newly received byte */
|
|
return BLT_TRUE;
|
|
}
|
|
/* inform caller that no new data was received */
|
|
return BLT_FALSE;
|
|
} /*** end of UartReceiveByte ***/
|
|
|
|
|
|
/************************************************************************************//**
|
|
** \brief Transmits a communication interface byte.
|
|
** \param data Value of byte that is to be transmitted.
|
|
** \return BLT_TRUE if the byte was transmitted, BLT_FALSE otherwise.
|
|
**
|
|
****************************************************************************************/
|
|
static blt_bool UartTransmitByte(blt_int8u data)
|
|
{
|
|
blt_int32u timeout;
|
|
blt_bool result = BLT_TRUE;
|
|
|
|
/* write byte to transmit holding register */
|
|
if (UARTCharPutNonBlocking(UART0_BASE, data) == false)
|
|
{
|
|
/* tx holding register can accept new data */
|
|
return BLT_FALSE;
|
|
}
|
|
/* set timeout time to wait for transmit completion. */
|
|
timeout = TimerGet() + UART_BYTE_TX_TIMEOUT_MS;
|
|
/* wait for tx holding register to be empty */
|
|
while (UARTSpaceAvail(UART0_BASE) == false)
|
|
{
|
|
/* keep the watchdog happy */
|
|
CopService();
|
|
/* break loop upon timeout. this would indicate a hardware failure. */
|
|
if (TimerGet() > timeout)
|
|
{
|
|
result = BLT_FALSE;
|
|
break;
|
|
}
|
|
}
|
|
/* give the result back to the caller */
|
|
return result;
|
|
} /*** end of UartTransmitByte ***/
|
|
#endif /* BOOT_COM_UART_ENABLE > 0 */
|
|
|
|
|
|
/*********************************** end of uart.c *************************************/
|