diff options
Diffstat (limited to 'Demo/NEC_V850ES_IAR/serial/serial.c')
| -rw-r--r-- | Demo/NEC_V850ES_IAR/serial/serial.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/Demo/NEC_V850ES_IAR/serial/serial.c b/Demo/NEC_V850ES_IAR/serial/serial.c new file mode 100644 index 00000000..59007b34 --- /dev/null +++ b/Demo/NEC_V850ES_IAR/serial/serial.c @@ -0,0 +1,271 @@ +/*
+ FreeRTOS.org V5.1.1 - Copyright (C) 2003-2008 Richard Barry.
+
+ This file is part of the FreeRTOS.org distribution.
+
+ FreeRTOS.org 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 2 of the License, or
+ (at your option) any later version.
+
+ FreeRTOS.org 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 should have received a copy of the GNU General Public License
+ along with FreeRTOS.org; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ A special exception to the GPL can be applied should you wish to distribute
+ a combined work that includes FreeRTOS.org, without being obliged to provide
+ the source code for any proprietary components. See the licensing section
+ of http://www.FreeRTOS.org for full details of how and when the exception
+ can be applied.
+
+ ***************************************************************************
+ ***************************************************************************
+ * *
+ * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
+ * and even write all or part of your application on your behalf. *
+ * See http://www.OpenRTOS.com for details of the services we provide to *
+ * expedite your project. *
+ * *
+ ***************************************************************************
+ ***************************************************************************
+
+ Please ensure to read the configuration and relevant port sections of the
+ online documentation.
+
+ http://www.FreeRTOS.org - Documentation, latest information, license and
+ contact details.
+
+ http://www.SafeRTOS.com - A version that is certified for use in safety
+ critical systems.
+
+ http://www.OpenRTOS.com - Commercial support, development, porting,
+ licensing and training services.
+*/
+
+/*
+ BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
+
+ *NOTE* - This file is designed to test some of the RTOS features - it is
+ not intended to represent an efficient implementation!
+*/
+
+/* Standard includes. */
+#include <stdlib.h>
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "queue.h"
+
+/* Demo application includes. */
+#include "serial.h"
+
+
+/* Hardware specifics. */
+#define serRX_DATA_PIN ( 0x01 )
+#define serTX_DATA_PIN ( 0x02 )
+#define serCLOCK_Fxx_DIV_8 0x03
+#define serUPWR ( 0x80 )
+#define serUTXE ( 0x40 )
+#define serURXE ( 0x20 )
+#define serUCL ( 0x02 )
+#define serLSB ( 0x10 )
+
+/* Misc. */
+#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
+#define serHANDLE ( ( xComPortHandle ) 1 )
+#define serNO_BLOCK ( ( portTickType ) 0 )
+
+/*-----------------------------------------------------------*/
+
+/* Queues used to hold received characters, and characters waiting to be
+transmitted. */
+static xQueueHandle xRxedChars;
+static xQueueHandle xCharsForTx;
+
+/*-----------------------------------------------------------*/
+
+/* Interrupt entry point written in the assembler file serialISR.s85. */
+extern void vSerialISREntry( void );
+
+/* Flag to indicate whether or not there are characters already queued to send. */
+static volatile unsigned long ulTxInProgress = pdFALSE;
+
+/*-----------------------------------------------------------*/
+
+/*
+ * See the serial2.h header file.
+ */
+xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
+{
+xComPortHandle xReturn = serHANDLE;
+const unsigned portLONG ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL;
+
+ /* Create the queues used to hold Rx and Tx characters. */
+ xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+ xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
+
+ /* If the queues were created correctly then setup the serial port
+ hardware. */
+ if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
+ {
+ portENTER_CRITICAL();
+ {
+ /* Set the UART0 Rx and Tx pins to their alternative function. */
+ PMC3 |= ( serRX_DATA_PIN | serTX_DATA_PIN );
+ PM3 &= ~( serTX_DATA_PIN );
+
+ /* Setup clock for required baud. */
+ UD0CTL1 = serCLOCK_Fxx_DIV_8;
+ UD0CTL2 = ulFuclk / ( 2 * ulWantedBaud );
+
+ /* Enable, n81. */
+ UD0CTL0 = ( serUPWR | serUTXE | serURXE | serUCL | serLSB );
+
+ /* Enable interrupts for both Rx and Tx. */
+ UD0TIC = 0x07;
+ UD0RIC = 0x07;
+
+ ulTxInProgress = pdFALSE;
+ }
+ portEXIT_CRITICAL();
+ }
+ else
+ {
+ xReturn = ( xComPortHandle ) 0;
+ }
+
+ /* This demo file only supports a single port but we have to return
+ something to comply with the standard demo header file. */
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
+{
+ /* The port handle is not required as this driver only supports one port. */
+ ( void ) pxPort;
+
+ /* Get the next character from the buffer. Return false if no characters
+ are available, or arrive before xBlockTime expires. */
+ if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
+ {
+ return pdTRUE;
+ }
+ else
+ {
+ return pdFALSE;
+ }
+}
+/*-----------------------------------------------------------*/
+
+void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
+{
+signed portCHAR *pxNext;
+
+ /* A couple of parameters that this port does not use. */
+ ( void ) usStringLength;
+ ( void ) pxPort;
+
+ /* NOTE: This implementation does not handle the queue being full as no
+ block time is used! */
+
+ /* The port handle is not required as this driver only supports UART0. */
+ ( void ) pxPort;
+
+ /* Send each character in the string, one at a time. */
+ pxNext = ( signed portCHAR * ) pcString;
+ while( *pxNext )
+ {
+ xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
+ pxNext++;
+ }
+}
+/*-----------------------------------------------------------*/
+
+signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
+{
+portBASE_TYPE xReturn = pdPASS;
+
+ portENTER_CRITICAL();
+ {
+ /* There are currently no characters queued up to send so write the
+ character directly to the UART. */
+ if( ulTxInProgress == pdFALSE )
+ {
+ UD0TX = cOutChar;
+ ulTxInProgress = pdTRUE;
+ }
+ else
+ {
+ /* The UART is already busy so write the character to the Tx queue.
+ The queue is drained from within the Tx interrupt. */
+ if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
+ {
+ xReturn = pdFAIL;
+ }
+ }
+ }
+ portEXIT_CRITICAL();
+
+ return xReturn;
+}
+/*-----------------------------------------------------------*/
+
+void vSerialClose( xComPortHandle xPort )
+{
+ /* Not supported as not required by the demo application. */
+}
+/*-----------------------------------------------------------*/
+
+/* Tx interrupt handler. This is called from the asm file wrapper. */
+void vUARTTxISRHandler( void )
+{
+char cChar;
+portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
+
+ /* Are there any more characters queue to transmit? */
+ if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
+ {
+ /* Send the next character. */
+ UD0TX = cChar;
+ }
+ else
+ {
+ /* The UART is no longer active. */
+ ulTxInProgress = pdFALSE;
+ }
+
+ /* If reading a character from the Rx queue caused a task to unblock, and
+ the unblocked task has a priority higher than the currently running task,
+ then xHigherPriorityTaskWoken will have been set to true and a context
+ switch should occur now. */
+ portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+}
+/*-----------------------------------------------------------*/
+
+/* Rx interrupt handler. This is called from the asm file wrapper. */
+void vUARTRxISRHandler( void )
+{
+portCHAR cChar;
+portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
+
+ /* Send the received character to the Rx queue. */
+ cChar = UD0RX;
+ xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
+
+ /* If sending a character to the Tx queue caused a task to unblock, and
+ the unblocked task has a priority higher than the currently running task,
+ then xHigherPriorityTaskWoken will have been set to true and a context
+ switch should occur now. */
+ portYIELD_FROM_ISR( xHigherPriorityTaskWoken );
+}
+
+
+
+
+
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