2 FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd.
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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 it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * Looking for a quick start? Then check out the FreeRTOS eBook! *
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29 * See http://www.FreeRTOS.org/Documentation for details *
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31 ***************************************************************************
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35 Please ensure to read the configuration and relevant port sections of the
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36 online documentation.
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38 http://www.FreeRTOS.org - Documentation, latest information, license and
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41 http://www.SafeRTOS.com - A version that is certified for use in safety
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44 http://www.OpenRTOS.com - Commercial support, development, porting,
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45 licensing and training services.
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49 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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52 /* Library includes. */
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53 #include "75x_uart.h"
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54 #include "75x_gpio.h"
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55 #include "75x_eic.h"
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56 #include "75x_mrcc.h"
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58 /* Scheduler includes. */
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59 #include "FreeRTOS.h"
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62 /* Demo application includes. */
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65 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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66 #define serNO_BLOCK ( ( portTickType ) 0 )
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68 /*-----------------------------------------------------------*/
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70 /* Queues used to hold received characters, and characters waiting to be
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72 static xQueueHandle xRxedChars;
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73 static xQueueHandle xCharsForTx;
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75 static volatile portBASE_TYPE xQueueEmpty = pdTRUE;
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77 /*-----------------------------------------------------------*/
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79 /* The interrupt service routine - called from the assembly entry point. */
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80 __arm void vSerialISR( void );
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82 /*-----------------------------------------------------------*/
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85 * See the serial2.h header file.
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87 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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89 xComPortHandle xReturn;
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90 UART_InitTypeDef UART_InitStructure;
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91 GPIO_InitTypeDef GPIO_InitStructure;
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92 EIC_IRQInitTypeDef EIC_IRQInitStructure;
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94 /* Create the queues used to hold Rx and Tx characters. */
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95 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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96 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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98 /* If the queues were created correctly then setup the serial port
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100 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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102 portENTER_CRITICAL();
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104 /* Enable the UART0 Clock. */
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105 MRCC_PeripheralClockConfig( MRCC_Peripheral_UART0, ENABLE );
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107 /* Configure the UART0_Tx as alternate function */
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108 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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109 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
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110 GPIO_Init(GPIO0, &GPIO_InitStructure);
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112 /* Configure the UART0_Rx as input floating */
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113 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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114 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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115 GPIO_Init(GPIO0, &GPIO_InitStructure);
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117 /* Configure UART0. */
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118 UART_InitStructure.UART_WordLength = UART_WordLength_8D;
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119 UART_InitStructure.UART_StopBits = UART_StopBits_1;
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120 UART_InitStructure.UART_Parity = UART_Parity_No;
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121 UART_InitStructure.UART_BaudRate = ulWantedBaud;
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122 UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
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123 UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
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124 UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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125 UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
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126 UART_Init(UART0, &UART_InitStructure);
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128 /* Enable the UART0 */
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129 UART_Cmd(UART0, ENABLE);
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131 /* Configure the IEC for the UART interrupts. */
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132 EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE;
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133 EIC_IRQInitStructure.EIC_IRQChannel = UART0_IRQChannel;
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134 EIC_IRQInitStructure.EIC_IRQChannelPriority = 1;
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135 EIC_IRQInit(&EIC_IRQInitStructure);
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137 xQueueEmpty = pdTRUE;
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138 UART_ITConfig( UART0, UART_IT_Transmit | UART_IT_Receive, ENABLE );
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140 portEXIT_CRITICAL();
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144 xReturn = ( xComPortHandle ) 0;
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147 /* This demo file only supports a single port but we have to return
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148 something to comply with the standard demo header file. */
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151 /*-----------------------------------------------------------*/
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153 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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155 /* The port handle is not required as this driver only supports one port. */
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158 /* Get the next character from the buffer. Return false if no characters
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159 are available, or arrive before xBlockTime expires. */
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160 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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169 /*-----------------------------------------------------------*/
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171 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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173 signed portCHAR *pxNext;
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175 /* A couple of parameters that this port does not use. */
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176 ( void ) usStringLength;
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179 /* NOTE: This implementation does not handle the queue being full as no
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180 block time is used! */
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182 /* The port handle is not required as this driver only supports UART0. */
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185 /* Send each character in the string, one at a time. */
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186 pxNext = ( signed portCHAR * ) pcString;
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189 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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193 /*-----------------------------------------------------------*/
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195 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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197 portBASE_TYPE xReturn;
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199 /* Place the character in the queue of characters to be transmitted. */
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200 portENTER_CRITICAL();
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202 if( xQueueEmpty == pdTRUE )
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204 UART0->DR = cOutChar;
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209 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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219 xQueueEmpty = pdFALSE;
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221 portEXIT_CRITICAL();
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225 /*-----------------------------------------------------------*/
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227 void vSerialClose( xComPortHandle xPort )
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229 /* Not supported as not required by the demo application. */
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231 /*-----------------------------------------------------------*/
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233 __arm void vSerialISR( void )
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235 signed portCHAR cChar;
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236 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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240 if( UART0->MIS & UART_IT_Transmit )
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242 /* The interrupt was caused by the THR becoming empty. Are there any
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243 more characters to transmit? */
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244 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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246 /* A character was retrieved from the queue so can be sent to the
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252 xQueueEmpty = pdTRUE;
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255 UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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258 if( UART0->MIS & UART_IT_Receive )
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260 /* The interrupt was caused by a character being received. Grab the
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261 character from the RHR and place it in the queue of received
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264 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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265 UART_ClearITPendingBit( UART0, UART_IT_Receive );
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267 } while( UART0->MIS );
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269 /* If a task was woken by either a character being received or a character
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270 being transmitted then we may need to switch to another task. */
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271 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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