[修改] 增加freeRTOS
1. 版本FreeRTOSv202212.01，命名为kernel；
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kernel/FreeRTOS/Demo/H8S/RTOSDemo/serial/serial.c
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kernel/FreeRTOS/Demo/H8S/RTOSDemo/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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/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1.
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Note that this driver is written to test the RTOS port and is not intended
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to represent an optimised solution. In particular no use is made of the DMA
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peripheral. */
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/* Standard include files. */
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#include <stdlib.h>
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/* Scheduler include files. */
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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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/* Demo application include files. */
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#include "serial.h"
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/* The queues used to communicate between the task code and the interrupt
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service routines. */
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static QueueHandle_t xRxedChars;
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static QueueHandle_t xCharsForTx;
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/* Hardware specific constants. */
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#define serTX_INTERRUPT ( ( unsigned char ) 0x80 )
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#define serRX_INTERRUPT ( ( unsigned char ) 0x40 )
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#define serTX_ENABLE ( ( unsigned char ) 0x20 )
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#define serRX_ENABLE ( ( unsigned char ) 0x10 )
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/* Macros to turn on and off the serial port THRE interrupt while leaving the
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other register bits in their correct state. The Rx interrupt is always
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enabled. */
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#define serTX_INTERRUPT_ON() SCR1 = serTX_INTERRUPT | serRX_INTERRUPT | serTX_ENABLE | serRX_ENABLE;
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#define serTX_INTERRUPT_OFF() SCR1 = serRX_INTERRUPT | serTX_ENABLE | serRX_ENABLE;
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/* Bit used to switch on the channel 1 serial port in the module stop
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register. */
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#define serMSTP6 ( ( unsigned short ) 0x0040 )
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/* Interrupt service routines. Note that the Rx and Tx service routines can
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cause a context switch and are therefore defined with the saveall attribute in
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addition to the interrupt_handler attribute. See the FreeRTOS.org WEB site
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documentation for a full explanation.*/
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void vCOM_1_Rx_ISR( void ) __attribute__ ( ( saveall, interrupt_handler ) );
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void vCOM_1_Tx_ISR( void ) __attribute__ ( ( saveall, interrupt_handler ) );
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void vCOM_1_Error_ISR( void ) __attribute__ ( ( interrupt_handler ) );
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/*-----------------------------------------------------------*/
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/*
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* Initialise port 1 for interrupt driven communications.
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*/
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xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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/* Create the queues used to communicate between the tasks and the
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interrupt service routines. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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/* No parity, 8 data bits and 1 stop bit is the default so does not require
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configuration - setup the remains of the hardware. */
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portENTER_CRITICAL();
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{
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/* Turn channel 1 on. */
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MSTPCR &= ~serMSTP6;
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/* Enable the channels and the Rx interrupt. The Tx interrupt is only
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enabled when data is being transmitted. */
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SCR1 = serRX_INTERRUPT | serTX_ENABLE | serRX_ENABLE;
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/* Bit rate settings for 22.1184MHz clock only!. */
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switch( ulWantedBaud )
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{
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case 4800 : BRR1 = 143;
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break;
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case 9600 : BRR1 = 71;
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break;
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case 19200 : BRR1 = 35;
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break;
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case 38400 : BRR1 = 17;
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break;
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case 57600 : BRR1 = 11;
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break;
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case 115200 : BRR1 = 5;
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break;
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default : BRR1 = 5;
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break;
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}
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}
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portEXIT_CRITICAL();
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/* Unlike some ports, this driver code does not allow for more than one
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com port. We therefore don't return a pointer to a port structure and can
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instead just return NULL. */
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return NULL;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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{
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/* Get the next character from the buffer queue. Return false if no characters
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are available, or arrive before xBlockTime expires. */
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if( xQueueReceive( 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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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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{
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signed portBASE_TYPE xReturn = pdPASS;
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/* Return false if after the block time there is no room on the Tx queue. */
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portENTER_CRITICAL();
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{
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/* Send a character to the queue of characters waiting transmission.
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The queue is serviced by the Tx ISR. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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/* Could not post onto the queue. */
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xReturn = pdFAIL;
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}
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else
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{
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/* The message was posted onto the queue so we turn on the Tx
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interrupt to allow the Tx ISR to remove the character from the
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queue. */
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serTX_INTERRUPT_ON();
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}
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}
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portEXIT_CRITICAL();
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Not supported. */
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( void ) xPort;
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}
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/*-----------------------------------------------------------*/
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void vCOM_1_Rx_ISR( void )
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{
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/* This can cause a context switch so this macro must be the first line
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in the function. */
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portENTER_SWITCHING_ISR();
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/* As this is a switching ISR the local variables must be declared as
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static. */
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static char cRxByte;
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static portBASE_TYPE xHigherPriorityTaskWoken;
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xHigherPriorityTaskWoken = pdFALSE;
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/* Get the character. */
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cRxByte = RDR1;
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/* Post the character onto the queue of received characters - noting
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whether or not this wakes a task. */
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xQueueSendFromISR( xRxedChars, &cRxByte, &xHigherPriorityTaskWoken );
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/* Clear the interrupt. */
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SSR1 &= ~serRX_INTERRUPT;
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/* This must be the last line in the function. We pass cTaskWokenByPost so
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a context switch will occur if the received character woke a task that has
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a priority higher than the task we interrupted. */
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portEXIT_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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/*-----------------------------------------------------------*/
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void vCOM_1_Tx_ISR( void )
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{
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/* This can cause a context switch so this macro must be the first line
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in the function. */
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portENTER_SWITCHING_ISR();
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/* As this is a switching ISR the local variables must be declared as
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static. */
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static char cTxByte;
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static signed portBASE_TYPE xTaskWokenByTx;
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/* This variable is static so must be explicitly reinitialised each
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time the function executes. */
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xTaskWokenByTx = pdFALSE;
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/* The interrupt was caused by the THR becoming empty. Are there any
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more characters to transmit? Note whether or not the Tx interrupt has
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woken a task. */
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if( xQueueReceiveFromISR( xCharsForTx, &cTxByte, &xTaskWokenByTx ) == pdTRUE )
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{
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/* A character was retrieved from the queue so can be sent to the
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THR now. */
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TDR1 = cTxByte;
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/* Clear the interrupt. */
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SSR1 &= ~serTX_INTERRUPT;
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}
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else
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{
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/* Queue empty, nothing to send so turn off the Tx interrupt. */
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serTX_INTERRUPT_OFF();
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}
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/* This must be the last line in the function. We pass cTaskWokenByTx so
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a context switch will occur if the Tx'ed character woke a task that has
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a priority higher than the task we interrupted. */
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portEXIT_SWITCHING_ISR( xTaskWokenByTx );
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}
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/*-----------------------------------------------------------*/
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/*
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* This ISR cannot cause a context switch so requires no special
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* considerations.
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*/
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void vCOM_1_Error_ISR( void )
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{
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volatile unsigned char ucIn;
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ucIn = SSR1;
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SSR1 = 0;
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}
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