2 FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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28 Please ensure to read the configuration and relevant port sections of the
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29 online documentation.
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31 +++ http://www.FreeRTOS.org +++
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32 Documentation, latest information, license and contact details.
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34 +++ http://www.SafeRTOS.com +++
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35 A version that is certified for use in safety critical systems.
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37 +++ http://www.OpenRTOS.com +++
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38 Commercial support, development, porting, licensing and training services.
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40 ***************************************************************************
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43 /* ------------------------ MCF523x includes ------------------------------ */
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44 #include "mcf5xxx.h"
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45 #include "mcf523x.h"
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47 /* ------------------------ FreeRTOS includes ----------------------------- */
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48 #include "FreeRTOS.h"
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54 /* ----------------------- Defines ----------------------------------------- */
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55 #define BAUDRATE_VALUE(fsys, baud) ( ( fsys )/(32UL * baud) )
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56 #define MCF_UART_VECTOR ( 64 + 13 )
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57 #define COM_NIFACE 1
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58 #define COM_BLOCK_RETRYTIME 10
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60 /* ------------------------ Static functions ------------------------------ */
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61 static void prvSerialISR( void );
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63 /* ------------------------ Static variables ------------------------------ */
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66 portBASE_TYPE xInitialized;
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67 xQueueHandle xRXChars;
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68 xQueueHandle xTXChars;
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71 static xComPortIF_t xComPortIF[ COM_NIFACE ];
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73 /* ------------------------ Begin implementation -------------------------- */
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75 xSerialPortInitMinimal( unsigned portLONG ulWantedBaud,
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76 unsigned portBASE_TYPE uxQueueLength )
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78 extern void ( *__RAMVEC[] ) ( );
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79 xComPortHandle xReturn;
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80 portBASE_TYPE xOldIPL;
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82 /* Create the queues used to hold Rx and Tx characters. */
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83 xComPortIF[ 0 ].xRXChars =
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84 xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
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85 xComPortIF[ 0 ].xTXChars =
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86 xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE )sizeof( signed portCHAR ) );
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88 /* If the queues were created correctly then setup the serial port hardware. */
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89 if( ( xComPortIF[ 0 ].xRXChars != 0 ) && ( xComPortIF[ 0 ].xTXChars != 0 ) )
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91 xOldIPL = portSET_IPL( portIPL_MAX );
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93 /* UART 0: Reset transmitter, receiver and mode register pointer */
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94 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x3 );
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95 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x2 );
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96 MCF_UART_UCR0 = MCF_UART_UCR_MISC( 0x1 );
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98 /* Enable receive interrupts. */
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99 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
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101 /* 8 Databits, 1 Stopbit and no parity */
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102 MCF_UART_UMR0 = MCF_UART_UMR_PM( 0x3 ) | MCF_UART_UMR_SB( 0x7 ) | MCF_UART_UMR_BC( 0x3 );
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104 /* UART 0 Clocking */
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105 MCF_UART_UCSR0 = MCF_UART_UCSR_RCS( 0xd ) | MCF_UART_UCSR_TCS( 0xd );
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106 MCF_UART_UBG10 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) >> 8U;
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107 MCF_UART_UBG20 = BAUDRATE_VALUE( FSYS_2, ulWantedBaud ) & 0xFFU;
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109 /* UART 0: Enable interrupts */
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110 __RAMVEC[MCF_UART_VECTOR] = prvSerialISR;
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111 MCF_INTC0_ICR13 = MCF_INTC0_ICRn_IL( 0x2 ) | MCF_INTC0_ICRn_IP( 0x1 );
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112 MCF_INTC0_IMRL &= ~MCF_INTC0_IMRL_INT_MASK13;
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114 /* UART 0 Miscellaneous */
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115 MCF_UART_UACR0 = 0;
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117 /* UART 0: Enable pins */
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118 MCF_GPIO_PAR_UART = MCF_GPIO_PAR_UART_PAR_U0RXD | MCF_GPIO_PAR_UART_PAR_U0TXD;
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120 /* Enable the UART. */
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121 MCF_UART_UCR0 = MCF_UART_UCR_RXC( 0x1 ) | MCF_UART_UCR_TXC( 0x1 );
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123 xComPortIF[ 0 ].xInitialized = TRUE;
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124 xReturn = ( xComPortHandle ) &xComPortIF[ 0 ];
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126 ( void )portSET_IPL( xOldIPL );
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130 xReturn = ( xComPortHandle ) 0;
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136 signed portBASE_TYPE
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137 xSerialGetChar( xComPortHandle pxPort, signed portCHAR * pcRxedChar,
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138 portTickType xBlockTime )
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141 portBASE_TYPE xResult = pdFALSE;
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142 /* Lookup the correct interface. */
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143 for( i = 0; i < COM_NIFACE; i++ )
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145 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
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150 /* This COM port is available. */
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151 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
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153 /* Get the next character from the buffer. Return false if no characters
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154 * are available, or arrive before xBlockTime expires.
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156 if( xQueueReceive( xComPortIF[ i ].xRXChars, pcRxedChar, xBlockTime ) )
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165 vSerialPutString( xComPortHandle pxPort, const signed portCHAR *
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166 const pcString, unsigned portSHORT usStringLength )
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169 signed portCHAR *pChNext;
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171 /* Send each character in the string, one at a time. */
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172 pChNext = ( signed portCHAR * )pcString;
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173 for( i = 0; i < usStringLength; i++ )
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175 /* Block until character has been transmitted. */
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176 while( xSerialPutChar( pxPort, *pChNext, COM_BLOCK_RETRYTIME ) != pdTRUE ); pChNext++;
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180 signed portBASE_TYPE
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181 xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar,
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182 portTickType xBlockTime )
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185 portBASE_TYPE xResult = pdFALSE;
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186 portBASE_TYPE xOldIPL;
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187 /* Lookup the correct interface. */
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188 for( i = 0; i < COM_NIFACE; i++ )
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190 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
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195 /* This COM port is available. */
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196 if( ( i != COM_NIFACE ) && xComPortIF[ i ].xInitialized )
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198 /* Place the character in the queue of characters to be transmitted. */
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199 if( xQueueSend( xComPortIF[ i ].xTXChars, &cOutChar, xBlockTime ) == pdPASS )
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201 /* Turn on the Tx interrupt so the ISR will remove the character from the
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202 * queue and send it. */
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203 MCF_UART_UIMR0 = MCF_UART_UIMR_TXRDY | MCF_UART_UIMR_RXRDY_FU;
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210 signed portBASE_TYPE
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211 xSerialPutCharNOISR( xComPortHandle pxPort, signed portCHAR cOutChar )
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214 portBASE_TYPE xResult = pdFALSE;
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215 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
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216 /* Lookup the correct interface. */
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217 for( i = 0; i < COM_NIFACE; i++ )
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219 if( pxPort == ( xComPortHandle ) &xComPortIF[ i ] )
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224 /* This COM port is available. Support for this only available for COM1 right now. */
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225 if( ( i != COM_NIFACE ) && ( i == 0 ) )
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227 /* Wait until the transmit buffer is ready. */
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228 while( !( MCF_UART_USR0 & MCF_UART_USR_TXRDY ) );
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229 /* Place the character in the transmit buffer. */
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230 MCF_UART_UTB0 = cOutChar;
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233 ( void )portSET_IPL( xOldIPL );
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238 vSerialPutStringNOISR( xComPortHandle pxPort, const signed portCHAR *
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239 const pcString, unsigned portSHORT usStringLength )
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242 signed portCHAR *pChNext;
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243 portBASE_TYPE xOldIPL = portSET_IPL( portIPL_MAX );
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245 /* Send each character in the string, one at a time. */
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246 pChNext = ( signed portCHAR * )pcString;
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247 for( i = 0; i < usStringLength; i++ )
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249 /* Block until character has been transmitted. */
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250 while( xSerialPutCharNOISR( pxPort, *pChNext ) != pdTRUE );
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253 ( void )portSET_IPL( xOldIPL );
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257 vSerialClose( xComPortHandle xPort )
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259 /* Not supported as not required by the demo application. */
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263 prvSerialISR( void )
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265 static signed portCHAR cChar;
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266 static portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByRx = pdFALSE;
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268 /* We have to remvoe the effect of the GCC. Please note that the
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269 * __attribute__ ((interrupt_handler)) does not work here because we
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270 * have to do the storing of the registers ourself. Another problem
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271 * is the usage of a frame pointer which is unlinked on entry.
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273 #if _GCC_USES_FP == 1
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274 asm volatile ( "unlk %fp\n\t" );
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276 /* This ISR can cause a context switch, so the first statement must be
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277 * a call to the portENTER_SWITCHING_ISR() macro. This must be BEFORE any
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278 * variable declarations.
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280 portENTER_SWITCHING_ISR();
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282 /* Ready to send a character from the buffer. */
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283 if( MCF_UART_USR0 & MCF_UART_USR_TXRDY )
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285 /* Transmit buffer is ready. Test if there are characters available. */
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286 if( xQueueReceiveFromISR( xComPortIF[ 0 ].xTXChars, &cChar, &xTaskWokenByTx ) ==
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289 /* A character was retrieved from the queue so can be sent. */
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290 MCF_UART_UTB0 = cChar;
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294 /* Leave only receiver enabled. */
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295 MCF_UART_UIMR0 = MCF_UART_UIMR_RXRDY_FU;
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298 if( MCF_UART_USR0 & MCF_UART_USR_RXRDY )
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300 cChar = MCF_UART_URB0;
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302 xQueueSendFromISR( xComPortIF[ 0].xRXChars, &cChar, xTaskWokenByRx );
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304 /* Exit the ISR. If a task was woken by either a character being
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305 * or transmitted then a context switch will occur.
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307 portEXIT_SWITCHING_ISR( ( xTaskWokenByTx || xTaskWokenByRx ) );
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