void vUARTCommandConsoleStart( uint16_t usStackSize, unsigned portBASE_TYPE uxPriority )
{
/* A UART is used for printf() output and CLI input and output. Note there
is no mutual exclusion on the UART, but the demo as it stands does not
require mutual exclusion. */
prvConfigureUART();
/* Create that task that handles the console itself. */
xTaskCreate( prvUARTCommandConsoleTask, /* The task that implements the command console. */
"CLI", /* Text name assigned to the task. This is just to assist debugging. The kernel does not use this name itself. */
usStackSize, /* The size of the stack allocated to the task. */
NULL, /* The parameter is not used, so NULL is passed. */
uxPriority, /* The priority allocated to the task. */
NULL ); /* A handle is not required, so just pass NULL. */
}
static void prvUARTCommandConsoleTask( void *pvParameters )
{
uint8_t ucRxedChar, ucInputIndex = 0, *pucOutputString;
static int8_t cInputString[ cmdMAX_INPUT_SIZE ], cLastInputString[ cmdMAX_INPUT_SIZE ];
portBASE_TYPE xReturned;
static struct usart_module xCDCUsart; /* Static so it doesn't take up too much stack. */
( void ) pvParameters;
/* A UART is used for printf() output and CLI input and output. Note there
is no mutual exclusion on the UART, but the demo as it stands does not
require mutual exclusion. */
prvConfigureUART( &xCDCUsart );
/* Obtain the address of the output buffer. Note there is no mutual
exclusion on this buffer as it is assumed only one command console
interface will be used at any one time. */
pucOutputString = ( uint8_t * ) FreeRTOS_CLIGetOutputBuffer();
/* Send the welcome message. */
prvSendBuffer( &xCDCUsart, pcWelcomeMessage, strlen( ( char * ) pcWelcomeMessage ) );
for( ;; )
{
/* Wait for the next character to arrive. A semaphore is used to
ensure no CPU time is used until data has arrived. */
usart_read_buffer_job( &xCDCUsart, &ucRxedChar, sizeof( ucRxedChar ) );
if( xSemaphoreTake( xRxCompleteSemaphore, portMAX_DELAY ) == pdPASS )
{
/* Echo the character back. */
prvSendBuffer( &xCDCUsart, ( uint8_t * ) &ucRxedChar, sizeof( ucRxedChar ) );
/* Was it the end of the line? */
if( ucRxedChar == '\n' || ucRxedChar == '\r' )
{
/* Just to space the output from the input. */
prvSendBuffer( &xCDCUsart, ( uint8_t * ) pcNewLine, strlen( ( char * ) pcNewLine ) );
/* See if the command is empty, indicating that the last command is
to be executed again. */
if( ucInputIndex == 0 )
{
/* Copy the last command back into the input string. */
strcpy( ( char * ) cInputString, ( char * ) cLastInputString );
}
/* Pass the received command to the command interpreter. The
command interpreter is called repeatedly until it returns pdFALSE
(indicating there is no more output) as it might generate more than
one string. */
do
{
/* Get the next output string from the command interpreter. */
xReturned = FreeRTOS_CLIProcessCommand( cInputString, ( int8_t * ) pucOutputString, configCOMMAND_INT_MAX_OUTPUT_SIZE );
/* Write the generated string to the UART. */
prvSendBuffer( &xCDCUsart, ( uint8_t * ) pucOutputString, strlen( ( char * ) pucOutputString ) );
} while( xReturned != pdFALSE );
/* All the strings generated by the input command have been sent.
Clear the input string ready to receive the next command. Remember
the command that was just processed first in case it is to be
processed again. */
strcpy( ( char * ) cLastInputString, ( char * ) cInputString );
ucInputIndex = 0;
memset( cInputString, 0x00, cmdMAX_INPUT_SIZE );
prvSendBuffer( &xCDCUsart, ( uint8_t * ) pcEndOfOutputMessage, strlen( ( char * ) pcEndOfOutputMessage ) );
}
else
{
if( ucRxedChar == '\r' )
{
/* Ignore the character. */
}
else if( ( ucRxedChar == '\b' ) || ( ucRxedChar == cmdASCII_DEL ) )
{
/* Backspace was pressed. Erase the last character in the
string - if any. */
if( ucInputIndex > 0 )
{
ucInputIndex--;
cInputString[ ucInputIndex ] = '\0';
}
}
else
{
/* A character was entered. Add it to the string
entered so far. When a \n is entered the complete
string will be passed to the command interpreter. */
if( ( ucRxedChar >= ' ' ) && ( ucRxedChar <= '~' ) )
{
if( ucInputIndex < cmdMAX_INPUT_SIZE )
{
cInputString[ ucInputIndex ] = ucRxedChar;
ucInputIndex++;
}
}
}
}
}
}
}
