[修改] 增加freeRTOS
1. 版本FreeRTOSv202212.01，命名为kernel；
This commit is contained in:
468
kernel/FreeRTOS/Demo/Flshlite/serial/serial.c
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468
kernel/FreeRTOS/Demo/Flshlite/serial/serial.c
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/*
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* FreeRTOS V202212.01
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* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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/*
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Changes from V1.00:
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+ Call to the more efficient portSWITCH_CONTEXT() replaces the call to
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taskYIELD() in the ISR.
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Changes from V1.01:
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+ The semaphore task is not operational. This does nothing but check
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the semaphore from ISR functionality.
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+ ISR modified slightly so only Rx or Tx is serviced per ISR - not both.
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Changes from V1.2.0:
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+ Change so Tx uses a DMA channel, and Rx uses an interrupt.
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Changes from V1.2.3
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+ The function xPortInitMinimal() has been renamed to
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xSerialPortInitMinimal() and the function xPortInit() has been renamed
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to xSerialPortInit().
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Changes from V1.2.5
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+ Reverted back to the non-DMA serial port driver, with a slightly modified
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ISR. This is a better test of the scheduler mechanisms.
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+ A critical section is now used in vInterruptOn().
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+ Flag sTxInterruptOn has been added to the port structure. This allows
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checking of the interrupt enable status without performing any IO.
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Changes from V2.0.0
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+ Use TickType_t in place of unsigned pdLONG for delay periods.
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+ Slightly more efficient vSerialSendString() implementation.
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+ cQueueReieveFromISR() used in place of xQueueReceive() in ISR.
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*/
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#include <stdlib.h>
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#include <dos.h>
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "task.h"
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#include "portasm.h"
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#include "semphr.h"
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#define serMAX_PORTS ( ( unsigned short ) 2 )
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#define serPORT_0_INT_REG ( 0xff44 )
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#define serPORT_0_BAUD_REG ( 0xff88 )
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#define serPORT_0_RX_REG ( 0xff86 )
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#define serPORT_0_TX_REG ( 0xff84 )
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#define serPORT_0_STATUS_REG ( 0xff82 )
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#define serPORT_0_CTRL_REG ( 0xff80 )
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#define serPORT_0_IRQ ( 0x14 )
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#define serPORT_1_INT_REG ( 0xff42 )
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#define serPORT_1_BAUD_REG ( 0xff18 )
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#define serPORT_1_RX_REG ( 0xff16 )
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#define serPORT_1_TX_REG ( 0xff14 )
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#define serPORT_1_STATUS_REG ( 0xff12 )
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#define serPORT_1_CTRL_REG ( 0xff10 )
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#define serPORT_1_IRQ ( 0x11 )
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#define serTX_EMPTY ( ( unsigned short ) 0x40 )
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#define serRX_READY ( ( unsigned short ) 0x80 )
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#define serRESET_PIC( usEOI_TYPE ) portOUTPUT_WORD( ( unsigned short ) 0xff22, usEOI_TYPE )
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#define serTX_HOLD_EMPTY_INT ( ( unsigned short ) 0x100 )
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#define serENABLE_INTERRUPTS ( ( unsigned short ) 0x80 )
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#define serMODE ( ( unsigned short ) 0x01 )
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#define serENABLE_TX_MACHINES ( ( unsigned short ) 0x40 )
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#define serENABLE_RX_MACHINES ( ( unsigned short ) 0x20 )
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#define serINTERRUPT_MASK ( ( unsigned short ) 0x08 )
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#define serCLEAR_ALL_STATUS_BITS ( ( unsigned short ) 0x00 )
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#define serINTERRUPT_PRIORITY ( ( unsigned short ) 0x01 ) /*< Just below the scheduler priority. */
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#define serDONT_BLOCK ( ( TickType_t ) 0 )
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typedef enum
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{
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serCOM1 = 0,
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serCOM2,
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serCOM3,
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serCOM4,
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serCOM5,
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serCOM6,
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serCOM7,
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serCOM8
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} eCOMPort;
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typedef enum
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{
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serNO_PARITY,
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serODD_PARITY,
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serEVEN_PARITY,
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serMARK_PARITY,
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serSPACE_PARITY
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} eParity;
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typedef enum
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{
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serSTOP_1,
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serSTOP_2
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} eStopBits;
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typedef enum
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{
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serBITS_5,
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serBITS_6,
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serBITS_7,
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serBITS_8
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} eDataBits;
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typedef enum
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{
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ser50 = 0,
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ser75,
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ser110,
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ser134,
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ser150,
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ser200,
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ser300,
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ser600,
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ser1200,
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ser1800,
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ser2400,
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ser4800,
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ser9600,
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ser19200,
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ser38400,
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ser57600,
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ser115200
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} eBaud;
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/* Must be same order as eBaud definitions. */
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static const unsigned short usBaudRateDivisor[] =
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{
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0, /* Not sure if the first 6 are correct. First cannot be used. */
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29127,
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19859,
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16302,
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14564,
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10923,
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6879,
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3437,
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1718,
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1145,
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859,
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429,
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214,
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107,
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54,
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35,
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18
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};
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typedef struct xCOM_PORT
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{
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/* Hardware parameters for this port. */
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short sTxInterruptOn;
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unsigned short usIntReg;
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unsigned short usBaudReg;
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unsigned short usRxReg;
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unsigned short usTxReg;
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unsigned short usStatusReg;
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unsigned short usCtrlReg;
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unsigned short usIRQVector;
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/* Queues used for communications with com test task. */
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QueueHandle_t xRxedChars;
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QueueHandle_t xCharsForTx;
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/* This semaphore does nothing useful except test a feature of the
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scheduler. */
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SemaphoreHandle_t xTestSem;
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} xComPort;
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static xComPort xPorts[ serMAX_PORTS ] =
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{
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{ pdFALSE, serPORT_0_INT_REG, serPORT_0_BAUD_REG, serPORT_0_RX_REG, serPORT_0_TX_REG, serPORT_0_STATUS_REG, serPORT_0_CTRL_REG, serPORT_0_IRQ, NULL, NULL, NULL },
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{ pdFALSE, serPORT_1_INT_REG, serPORT_1_BAUD_REG, serPORT_1_RX_REG, serPORT_1_TX_REG, serPORT_1_STATUS_REG, serPORT_1_CTRL_REG, serPORT_1_IRQ, NULL, NULL, NULL }
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};
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typedef xComPort * xComPortHandle;
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/* These prototypes are repeated here so we don't have to include the serial header. This allows
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the xComPortHandle structure details to be private to this file. */
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xComPortHandle xSerialPortInit( eCOMPort ePort, eBaud eWantedBaud, eParity eWantedParity, eDataBits eWantedDataBits, eStopBits eWantedStopBits, unsigned portBASE_TYPE uxBufferLength );
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portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, char *pcRxedChar, TickType_t xBlockTime );
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portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, char cOutChar, TickType_t xBlockTime );
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void vSerialClose( xComPortHandle xPort );
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short sSerialWaitForSemaphore( xComPortHandle xPort );
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/*-----------------------------------------------------------*/
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static short xComPortISR( xComPort * const pxPort );
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#define vInterruptOn( pxPort, usInterrupt ) \
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{ \
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unsigned short usIn; \
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\
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portENTER_CRITICAL(); \
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{ \
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if( pxPort->sTxInterruptOn == pdFALSE ) \
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{ \
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usIn = portINPUT_WORD( pxPort->usCtrlReg ); \
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portOUTPUT_WORD( pxPort->usCtrlReg, usIn | usInterrupt ); \
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\
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pxPort->sTxInterruptOn = pdTRUE; \
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} \
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} \
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portEXIT_CRITICAL(); \
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}
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/*-----------------------------------------------------------*/
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#define vInterruptOff( pxPort, usInterrupt ) \
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{ \
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unsigned short usIn = portINPUT_WORD( pxPort->usCtrlReg ); \
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if( usIn & usInterrupt ) \
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{ \
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portOUTPUT_WORD( pxPort->usCtrlReg, usIn & ~usInterrupt); \
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pxPort->sTxInterruptOn = pdFALSE; \
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} \
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}
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/*-----------------------------------------------------------*/
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/* Define an interrupt handler for each port */
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#define COM_IRQ_WRAPPER(N) \
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static void __interrupt COM_IRQ##N##_WRAPPER( void ) \
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{ \
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if( xComPortISR( &( xPorts[##N##] ) ) ) \
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{ \
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portSWITCH_CONTEXT(); \
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} \
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}
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COM_IRQ_WRAPPER( 0 )
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COM_IRQ_WRAPPER( 1 )
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static pxISR xISRs[ serMAX_PORTS ] =
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{
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COM_IRQ0_WRAPPER,
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COM_IRQ1_WRAPPER
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};
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/*-----------------------------------------------------------*/
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xComPortHandle xSerialPortInit( eCOMPort ePort, eBaud eWantedBaud, eParity eWantedParity, eDataBits eWantedDataBits, eStopBits eWantedStopBits, unsigned portBASE_TYPE uxBufferLength )
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{
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unsigned short usPort;
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xComPortHandle pxPort = NULL;
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/* BAUDDIV = ( Microprocessor Clock / Baud Rate ) / 16 */
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/* Only n, 8, 1 is supported so these parameters are not required for this
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port. */
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( void ) eWantedParity;
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( void ) eWantedDataBits;
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( void ) eWantedStopBits;
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/* Currently only n,8,1 is supported. */
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usPort = ( unsigned short ) ePort;
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if( usPort < serMAX_PORTS )
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{
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pxPort = &( xPorts[ usPort ] );
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portENTER_CRITICAL();
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{
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unsigned short usInWord;
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/* Create the queues used by the com test task. */
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pxPort->xRxedChars = xQueueCreate( uxBufferLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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pxPort->xCharsForTx = xQueueCreate( uxBufferLength, ( unsigned portBASE_TYPE ) sizeof( char ) );
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/* Create the test semaphore. This does nothing useful except test a feature of the scheduler. */
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vSemaphoreCreateBinary( pxPort->xTestSem );
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/* There is no ISR here already to restore later. */
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_dos_setvect( ( short ) pxPort->usIRQVector, xISRs[ usPort ] );
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usInWord = portINPUT_WORD( pxPort->usIntReg );
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usInWord &= ~serINTERRUPT_MASK;
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usInWord |= serINTERRUPT_PRIORITY;
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portOUTPUT_WORD( pxPort->usIntReg, usInWord );
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portOUTPUT_WORD( pxPort->usBaudReg, usBaudRateDivisor[ eWantedBaud ] );
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portOUTPUT_WORD( pxPort->usCtrlReg, serENABLE_INTERRUPTS | serMODE | serENABLE_TX_MACHINES | serENABLE_RX_MACHINES );
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portOUTPUT_WORD( pxPort->usStatusReg, serCLEAR_ALL_STATUS_BITS );
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}
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portEXIT_CRITICAL();
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}
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return pxPort;
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} /*lint !e715 Some parameters are not used as only a subset of the serial port functionality is currently implemented. */
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/*-----------------------------------------------------------*/
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void vSerialPutString( xComPortHandle pxPort, const char * const pcString, unsigned short usStringLength )
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{
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unsigned short usByte;
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char *pcNextChar;
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pcNextChar = ( char * ) pcString;
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for( usByte = 0; usByte < usStringLength; usByte++ )
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{
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xQueueSend( pxPort->xCharsForTx, pcNextChar, serDONT_BLOCK );
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pcNextChar++;
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}
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vInterruptOn( pxPort, serTX_HOLD_EMPTY_INT );
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Get the next character from the buffer, note that this routine is only
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called having checked that the is (at least) one to get */
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if( xQueueReceive( pxPort->xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, char cOutChar, TickType_t xBlockTime )
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{
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if( xQueueSend( pxPort->xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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return pdFAIL;
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}
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vInterruptOn( pxPort, serTX_HOLD_EMPTY_INT );
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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portBASE_TYPE xSerialWaitForSemaphore( xComPortHandle xPort )
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{
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const TickType_t xBlockTime = ( TickType_t ) 0xffff;
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/* This function does nothing interesting, but test the
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semaphore from ISR mechanism. */
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return xSemaphoreTake( xPort->xTestSem, xBlockTime );
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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unsigned short usOutput;
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/* Turn off the interrupts. We may also want to delete the queues and/or
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re-install the original ISR. */
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portENTER_CRITICAL();
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{
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usOutput = portINPUT_WORD( xPort->usCtrlReg );
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usOutput &= ~serENABLE_INTERRUPTS;
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usOutput &= ~serENABLE_TX_MACHINES;
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usOutput &= ~serENABLE_RX_MACHINES;
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portOUTPUT_WORD( xPort->usCtrlReg, usOutput );
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usOutput = portINPUT_WORD( xPort->usIntReg );
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usOutput |= serINTERRUPT_MASK;
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portOUTPUT_WORD( xPort->usIntReg, usOutput );
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}
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portEXIT_CRITICAL();
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}
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/*-----------------------------------------------------------*/
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static portBASE_TYPE xComPortISR( xComPort * const pxPort )
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{
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unsigned short usStatusRegister;
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char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE, xContinue = pdTRUE;
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/* NOTE: THIS IS NOT AN EFFICIENT ISR AS IT IS DESIGNED SOLELY TO TEST
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THE SCHEDULER FUNCTIONALITY. REAL APPLICATIONS SHOULD NOT USE THIS
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FUNCTION. */
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while( xContinue == pdTRUE )
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{
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xContinue = pdFALSE;
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usStatusRegister = portINPUT_WORD( pxPort->usStatusReg );
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if( usStatusRegister & serRX_READY )
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{
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cChar = ( char ) portINPUT_WORD( pxPort->usRxReg );
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xQueueSendFromISR( pxPort->xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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/* Also release the semaphore - this does nothing interesting and is just a test. */
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xSemaphoreGiveFromISR( pxPort->xTestSem, &xHigherPriorityTaskWoken );
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/* We have performed an action this cycle - there may be other to perform. */
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xContinue = pdTRUE;
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}
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if( pxPort->sTxInterruptOn && ( usStatusRegister & serTX_EMPTY ) )
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{
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if( xQueueReceiveFromISR( pxPort->xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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portOUTPUT_WORD( pxPort->usTxReg, ( unsigned short ) cChar );
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/* We have performed an action this cycle - there may be others to perform. */
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xContinue = pdTRUE;
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}
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else
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{
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/* Queue empty, nothing to send */
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vInterruptOff( pxPort, serTX_HOLD_EMPTY_INT );
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}
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}
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}
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serRESET_PIC( pxPort->usIRQVector );
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/* If posting to the queue woke a task that was blocked on the queue we may
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want to switch to the woken task - depending on its priority relative to
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the task interrupted by this ISR. */
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return xHigherPriorityTaskWoken;
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}
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