2 FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.
\r
4 This file is part of the FreeRTOS distribution.
\r
6 FreeRTOS is free software; you can redistribute it and/or modify
\r
7 it under the terms of the GNU General Public License as published by
\r
8 the Free Software Foundation; either version 2 of the License, or
\r
9 (at your option) any later version.
\r
11 FreeRTOS is distributed in the hope that it will be useful,
\r
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 GNU General Public License for more details.
\r
16 You should have received a copy of the GNU General Public License
\r
17 along with FreeRTOS; if not, write to the Free Software
\r
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
20 A special exception to the GPL can be applied should you wish to distribute
\r
21 a combined work that includes FreeRTOS, without being obliged to provide
\r
22 the source code for any proprietary components. See the licensing section
\r
23 of http://www.FreeRTOS.org for full details of how and when the exception
\r
26 ***************************************************************************
\r
27 ***************************************************************************
\r
29 * SAVE TIME AND MONEY! Why not get us to quote to get FreeRTOS.org *
\r
30 * running on your hardware - or even write all or part of your application*
\r
31 * for you? See http://www.OpenRTOS.com for details. *
\r
33 ***************************************************************************
\r
34 ***************************************************************************
\r
36 Please ensure to read the configuration and relevant port sections of the
\r
37 online documentation.
\r
39 http://www.FreeRTOS.org - Documentation, latest information, license and
\r
42 http://www.SafeRTOS.com - A version that is certified for use in safety
\r
45 http://www.OpenRTOS.com - Commercial support, development, porting,
\r
46 licensing and training services.
\r
49 /* ------------------------ MCF523x includes ------------------------------ */
\r
50 #include "mcf5xxx.h"
\r
51 #include "mcf523x.h"
\r
53 /* ------------------------ FreeRTOS includes ----------------------------- */
\r
54 #include "FreeRTOS.h"
\r
60 /* ----------------------- Defines ----------------------------------------- */
\r
61 #define BAUDRATE_VALUE(fsys, baud) ( ( fsys )/(32UL * baud) )
\r
62 #define MCF_UART_VECTOR ( 64 + 13 )
\r
63 #define COM_NIFACE 1
\r
64 #define COM_BLOCK_RETRYTIME 10
\r
66 /* ------------------------ Static functions ------------------------------ */
\r
67 static void prvSerialISR( void );
\r
69 /* ------------------------ Static variables ------------------------------ */
\r
72 portBASE_TYPE xInitialized;
\r
73 xQueueHandle xRXChars;
\r
74 xQueueHandle xTXChars;
\r
77 static xComPortIF_t xComPortIF[ COM_NIFACE ];
\r
79 /* ------------------------ Begin implementation -------------------------- */
\r
81 xSerialPortInitMinimal( unsigned portLONG ulWantedBaud,
\r
82 unsigned portBASE_TYPE uxQueueLength )
\r
84 extern void ( *__RAMVEC[] ) ( );
\r
85 xComPortHandle xReturn;
\r
86 portBASE_TYPE xOldIPL;
\r
88 /* Create the queues used to hold Rx and Tx characters. */
\r
89 xComPortIF[ 0 ].xRXChars =
\r
90 xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
\r
91 xComPortIF[ 0 ].xTXChars =
\r
92 xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
\r
94 /* If the queues were created correctly then setup the serial port hardware. */
\r
95 if( ( xComPortIF[ 0 ].xRXChars != 0 ) && ( xComPortIF[ 0 ].xTXChars != 0 ) )
\r
97 xOldIPL = portSET_IPL( portIPL_MAX );
\r
99 /* UART 0: Reset transmitter, receiver and mode register pointer */
\r
100 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x3 );
\r
101 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x2 );
\r
102 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x1 );
\r
104 /* Enable receive interrupts. */
\r
105 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
\r
107 /* 8 Databits, 1 Stopbit and no parity */
\r
108 MCF_UART_UMR0 = MCF_UART_UMR_PM( 0x3 ) | MCF_UART_UMR_SB( 0x7 ) | MCF_UART_UMR_BC( 0x3 );
\r
110 /* UART 0 Clocking */
\r
111 MCF_UART_UCSR0 = MCF_UART_UCSR_RCS( 0xd ) | MCF_UART_UCSR_TCS( 0xd );
\r
112 MCF_UART_UBG10 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) >> 8U;
\r
113 MCF_UART_UBG20 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) & 0xFFU;
\r
115 /* UART 0: Enable interrupts */
\r
116 __RAMVEC[MCF_UART_VECTOR] = prvSerialISR;
\r
117 MCF_INTC0_ICR13 = MCF_INTC0_ICRn_IL( 0x2 ) | MCF_INTC0_ICRn_IP( 0x1 );
\r
118 MCF_INTC0_IMRL &= ~MCF_INTC0_IMRL_INT_MASK13;
\r
120 /* UART 0 Miscellaneous */
\r
121 MCF_UART_UACR0 = 0;
\r
123 /* UART 0: Enable pins */
\r
124 MCF_GPIO_PAR_UART = MCF_GPIO_PAR_UART_PAR_U0RXD | MCF_GPIO_PAR_UART_PAR_U0TXD;
\r
126 /* Enable the UART. */
\r
127 MCF_UART_UCR0 = MCF_UART_UCR_RXC( 0x1 ) | MCF_UART_UCR_TXC( 0x1 );
\r
129 xComPortIF[ 0 ].xInitialized = TRUE;
\r
130 xReturn = ( xComPortHandle ) &xComPortIF[ 0 ];
\r
132 ( void )portSET_IPL( xOldIPL );
\r
136 xReturn = ( xComPortHandle ) 0;
\r
142 signed portBASE_TYPE
\r
143 xSerialGetChar( xComPortHandle pxPort, signed portCHAR * pcRxedChar,
\r
144 portTickType xBlockTime )
\r
147 portBASE_TYPE xResult = pdFALSE;
\r
148 /* Lookup the correct interface. */
\r
149 for( i = 0; i < COM_NIFACE; i++ )
\r
151 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
\r
156 /* This COM port is available. */
\r
157 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
\r
159 /* Get the next character from the buffer. Return false if no characters
\r
160 * are available, or arrive before xBlockTime expires.
\r
162 if( xQueueReceive( xComPortIF[ i ].xRXChars, pcRxedChar, xBlockTime ) )
\r
171 vSerialPutString( xComPortHandle pxPort, const signed portCHAR *
\r
172 const pcString, unsigned portSHORT usStringLength )
\r
175 signed portCHAR *pChNext;
\r
177 /* Send each character in the string, one at a time. */
\r
178 pChNext = ( signed portCHAR * )pcString;
\r
179 for( i = 0; i < usStringLength; i++ )
\r
181 /* Block until character has been transmitted. */
\r
182 while( xSerialPutChar( pxPort, *pChNext, COM_BLOCK_RETRYTIME ) != pdTRUE ); pChNext++;
\r
186 signed portBASE_TYPE
\r
187 xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar,
\r
188 portTickType xBlockTime )
\r
191 portBASE_TYPE xResult = pdFALSE;
\r
192 portBASE_TYPE xOldIPL;
\r
193 /* Lookup the correct interface. */
\r
194 for( i = 0; i < COM_NIFACE; i++ )
\r
196 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
\r
201 /* This COM port is available. */
\r
202 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
\r
204 /* Place the character in the queue of characters to be transmitted. */
\r
205 if( xQueueSend( xComPortIF[ i ].xTXChars, &cOutChar, xBlockTime ) == pdPASS )
\r
207 /* Turn on the Tx interrupt so the ISR will remove the character from the
\r
208 * queue and send it. */
\r
209 MCF_UART_UIMR0 = MCF_UART_UIMR_TXRDY | MCF_UART_UIMR_RXRDY_FU;
\r
216 signed portBASE_TYPE
\r
217 xSerialPutCharNOISR( xComPortHandle pxPort, signed portCHAR cOutChar )
\r
220 portBASE_TYPE xResult = pdFALSE;
\r
221 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
\r
222 /* Lookup the correct interface. */
\r
223 for( i = 0; i < COM_NIFACE; i++ )
\r
225 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
\r
230 /* This COM port is available. Support for this only available for COM1 right now. */
\r
231 if( ( i != COM_NIFACE ) && ( i == 0 ) )
\r
233 /* Wait until the transmit buffer is ready. */
\r
234 while( !( MCF_UART_USR0 & MCF_UART_USR_TXRDY ) );
\r
235 /* Place the character in the transmit buffer. */
\r
236 MCF_UART_UTB0 = cOutChar;
\r
239 ( void )portSET_IPL( xOldIPL );
\r
244 vSerialPutStringNOISR( xComPortHandle pxPort, const signed portCHAR *
\r
245 const pcString, unsigned portSHORT usStringLength )
\r
248 signed portCHAR *pChNext;
\r
249 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
\r
251 /* Send each character in the string, one at a time. */
\r
252 pChNext = ( signed portCHAR * )pcString;
\r
253 for( i = 0; i < usStringLength; i++ )
\r
255 /* Block until character has been transmitted. */
\r
256 while( xSerialPutCharNOISR( pxPort, *pChNext ) != pdTRUE );
\r
259 ( void )portSET_IPL( xOldIPL );
\r
263 vSerialClose( xComPortHandle xPort )
\r
265 /* Not supported as not required by the demo application. */
\r
269 prvSerialISR( void )
\r
271 static signed portCHAR cChar;
\r
272 static portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
\r
274 /* We have to remvoe the effect of the GCC. Please note that the
\r
275 * __attribute__ ((interrupt_handler)) does not work here because we
\r
276 * have to do the storing of the registers ourself. Another problem
\r
277 * is the usage of a frame pointer which is unlinked on entry.
\r
279 #if _GCC_USES_FP == 1
\r
280 asm volatile ( "unlk %fp\n\t" );
\r
282 /* This ISR can cause a context switch, so the first statement must be
\r
283 * a call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any
\r
284 * variable declarations.
\r
286 portENTER_SWITCHING_ISR();
\r
288 /* Ready to send a character from the buffer. */
\r
289 if( MCF_UART_USR0 & MCF_UART_USR_TXRDY )
\r
291 /* Transmit buffer is ready. Test if there are characters available. */
\r
292 if( xQueueReceiveFromISR( xComPortIF[ 0 ].xTXChars, &cChar, &xTaskWokenByTx ) ==
\r
295 /* A character was retrieved from the queue so can be sent. */
\r
296 MCF_UART_UTB0 = cChar;
\r
300 /* Leave only receiver enabled. */
\r
301 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
\r
304 if( MCF_UART_USR0 & MCF_UART_USR_RXRDY )
\r
306 cChar = MCF_UART_URB0;
\r
308 xQueueSendFromISR( xComPortIF[ 0].xRXChars, &cChar, xTaskWokenByRx );
\r
310 /* Exit the ISR. If a task was woken by either a character being
\r
311 * or transmitted then a context switch will occur.
\r
313 portEXIT_SWITCHING_ISR( ( xTaskWokenByTx || xTaskWokenByRx ) );
\r