2 FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.
4 This file is part of the FreeRTOS distribution.
6 FreeRTOS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 FreeRTOS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 A special exception to the GPL can be applied should you wish to distribute
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26 ***************************************************************************
27 See http://www.FreeRTOS.org for documentation, latest information, license
28 and contact details. Please ensure to read the configuration and relevant
29 port sections of the online documentation.
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31 Also see http://www.SafeRTOS.com for an IEC 61508 compliant version along
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32 with commercial development and support options.
33 ***************************************************************************
36 /* ------------------------ MCF523x includes ------------------------------ */
40 /* ------------------------ FreeRTOS includes ----------------------------- */
47 /* ----------------------- Defines ----------------------------------------- */
48 #define BAUDRATE_VALUE(fsys, baud) ( ( fsys )/(32UL * baud) )
49 #define MCF_UART_VECTOR ( 64 + 13 )
51 #define COM_BLOCK_RETRYTIME 10
53 /* ------------------------ Static functions ------------------------------ */
54 static void prvSerialISR( void );
56 /* ------------------------ Static variables ------------------------------ */
59 portBASE_TYPE xInitialized;
60 xQueueHandle xRXChars;
61 xQueueHandle xTXChars;
64 static xComPortIF_t xComPortIF[ COM_NIFACE ];
66 /* ------------------------ Begin implementation -------------------------- */
68 xSerialPortInitMinimal( unsigned portLONG ulWantedBaud,
69 unsigned portBASE_TYPE uxQueueLength )
71 extern void ( *__RAMVEC[] ) ( );
72 xComPortHandle xReturn;
73 portBASE_TYPE xOldIPL;
75 /* Create the queues used to hold Rx and Tx characters. */
76 xComPortIF[ 0 ].xRXChars =
77 xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
78 xComPortIF[ 0 ].xTXChars =
79 xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
81 /* If the queues were created correctly then setup the serial port hardware. */
82 if( ( xComPortIF[ 0 ].xRXChars != 0 ) && ( xComPortIF[ 0 ].xTXChars != 0 ) )
84 xOldIPL = portSET_IPL( portIPL_MAX );
86 /* UART 0: Reset transmitter, receiver and mode register pointer */
87 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x3 );
88 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x2 );
89 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x1 );
91 /* Enable receive interrupts. */
92 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
94 /* 8 Databits, 1 Stopbit and no parity */
95 MCF_UART_UMR0 = MCF_UART_UMR_PM( 0x3 ) | MCF_UART_UMR_SB( 0x7 ) | MCF_UART_UMR_BC( 0x3 );
98 MCF_UART_UCSR0 = MCF_UART_UCSR_RCS( 0xd ) | MCF_UART_UCSR_TCS( 0xd );
99 MCF_UART_UBG10 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) >> 8U;
100 MCF_UART_UBG20 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) & 0xFFU;
102 /* UART 0: Enable interrupts */
103 __RAMVEC[MCF_UART_VECTOR] = prvSerialISR;
104 MCF_INTC0_ICR13 = MCF_INTC0_ICRn_IL( 0x2 ) | MCF_INTC0_ICRn_IP( 0x1 );
105 MCF_INTC0_IMRL &= ~MCF_INTC0_IMRL_INT_MASK13;
107 /* UART 0 Miscellaneous */
110 /* UART 0: Enable pins */
111 MCF_GPIO_PAR_UART = MCF_GPIO_PAR_UART_PAR_U0RXD | MCF_GPIO_PAR_UART_PAR_U0TXD;
113 /* Enable the UART. */
114 MCF_UART_UCR0 = MCF_UART_UCR_RXC( 0x1 ) | MCF_UART_UCR_TXC( 0x1 );
116 xComPortIF[ 0 ].xInitialized = TRUE;
117 xReturn = ( xComPortHandle ) &xComPortIF[ 0 ];
119 ( void )portSET_IPL( xOldIPL );
123 xReturn = ( xComPortHandle ) 0;
130 xSerialGetChar( xComPortHandle pxPort, signed portCHAR * pcRxedChar,
131 portTickType xBlockTime )
134 portBASE_TYPE xResult = pdFALSE;
135 /* Lookup the correct interface. */
136 for( i = 0; i < COM_NIFACE; i++ )
138 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
143 /* This COM port is available. */
144 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
146 /* Get the next character from the buffer. Return false if no characters
147 * are available, or arrive before xBlockTime expires.
149 if( xQueueReceive( xComPortIF[ i ].xRXChars, pcRxedChar, xBlockTime ) )
158 vSerialPutString( xComPortHandle pxPort, const signed portCHAR *
159 const pcString, unsigned portSHORT usStringLength )
162 signed portCHAR *pChNext;
164 /* Send each character in the string, one at a time. */
165 pChNext = ( signed portCHAR * )pcString;
166 for( i = 0; i < usStringLength; i++ )
168 /* Block until character has been transmitted. */
169 while( xSerialPutChar( pxPort, *pChNext, COM_BLOCK_RETRYTIME ) != pdTRUE ); pChNext++;
174 xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar,
175 portTickType xBlockTime )
178 portBASE_TYPE xResult = pdFALSE;
179 portBASE_TYPE xOldIPL;
180 /* Lookup the correct interface. */
181 for( i = 0; i < COM_NIFACE; i++ )
183 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
188 /* This COM port is available. */
189 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
191 /* Place the character in the queue of characters to be transmitted. */
192 if( xQueueSend( xComPortIF[ i ].xTXChars, &cOutChar, xBlockTime ) == pdPASS )
194 /* Turn on the Tx interrupt so the ISR will remove the character from the
195 * queue and send it. */
196 MCF_UART_UIMR0 = MCF_UART_UIMR_TXRDY | MCF_UART_UIMR_RXRDY_FU;
204 xSerialPutCharNOISR( xComPortHandle pxPort, signed portCHAR cOutChar )
207 portBASE_TYPE xResult = pdFALSE;
208 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
209 /* Lookup the correct interface. */
210 for( i = 0; i < COM_NIFACE; i++ )
212 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
217 /* This COM port is available. Support for this only available for COM1 right now. */
218 if( ( i != COM_NIFACE ) && ( i == 0 ) )
220 /* Wait until the transmit buffer is ready. */
221 while( !( MCF_UART_USR0 & MCF_UART_USR_TXRDY ) );
222 /* Place the character in the transmit buffer. */
223 MCF_UART_UTB0 = cOutChar;
226 ( void )portSET_IPL( xOldIPL );
231 vSerialPutStringNOISR( xComPortHandle pxPort, const signed portCHAR *
232 const pcString, unsigned portSHORT usStringLength )
235 signed portCHAR *pChNext;
236 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
238 /* Send each character in the string, one at a time. */
239 pChNext = ( signed portCHAR * )pcString;
240 for( i = 0; i < usStringLength; i++ )
242 /* Block until character has been transmitted. */
243 while( xSerialPutCharNOISR( pxPort, *pChNext ) != pdTRUE );
246 ( void )portSET_IPL( xOldIPL );
250 vSerialClose( xComPortHandle xPort )
252 /* Not supported as not required by the demo application. */
258 static signed portCHAR cChar;
259 static portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
261 /* We have to remvoe the effect of the GCC. Please note that the
262 * __attribute__ ((interrupt_handler)) does not work here because we
263 * have to do the storing of the registers ourself. Another problem
264 * is the usage of a frame pointer which is unlinked on entry.
266 #if _GCC_USES_FP == 1
267 asm volatile ( "unlk %fp\n\t" );
269 /* This ISR can cause a context switch, so the first statement must be
270 * a call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any
271 * variable declarations.
273 portENTER_SWITCHING_ISR();
275 /* Ready to send a character from the buffer. */
276 if( MCF_UART_USR0 & MCF_UART_USR_TXRDY )
278 /* Transmit buffer is ready. Test if there are characters available. */
279 if( xQueueReceiveFromISR( xComPortIF[ 0 ].xTXChars, &cChar, &xTaskWokenByTx ) ==
282 /* A character was retrieved from the queue so can be sent. */
283 MCF_UART_UTB0 = cChar;
287 /* Leave only receiver enabled. */
288 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
291 if( MCF_UART_USR0 & MCF_UART_USR_RXRDY )
293 cChar = MCF_UART_URB0;
295 xQueueSendFromISR( xComPortIF[ 0].xRXChars, &cChar, xTaskWokenByRx );
297 /* Exit the ISR. If a task was woken by either a character being
298 * or transmitted then a context switch will occur.
300 portEXIT_SWITCHING_ISR( ( xTaskWokenByTx || xTaskWokenByRx ) );