mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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3a2f6646f0
* Use new version of CI-CD Actions, checkout@v3 instead of checkout@v2 on all jobs * Use cSpell spell check, and use ubuntu-20.04 for formatting check * Add in bot formatting action * Update freertos_demo.yml and freertos_plus_demo.yml files to increase github log readability * Add in a Qemu demo onto the workflows.
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* FreeRTOS V202212.00
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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typedef struct UART_t
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{
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volatile uint32_t DATA;
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volatile uint32_t STATE;
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volatile uint32_t CTRL;
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volatile uint32_t INTSTATUS;
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volatile uint32_t BAUDDIV;
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} UART_t;
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#define UART0_ADDR ( ( UART_t * ) ( 0x40004000 ) )
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#define UART_DR( baseaddr ) ( *( unsigned int * ) ( baseaddr ) )
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#define UART_STATE_TXFULL ( 1 << 0 )
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#define UART_CTRL_TX_EN ( 1 << 0 )
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#define UART_CTRL_RX_EN ( 1 << 1 )
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extern unsigned long _heap_bottom;
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extern unsigned long _heap_top;
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extern unsigned long g_ulBase;
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static void * heap_end = 0;
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/**
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* @brief initializes the UART emulated hardware
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*/
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void uart_init()
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{
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UART0_ADDR->BAUDDIV = 16;
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UART0_ADDR->CTRL = UART_CTRL_TX_EN;
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}
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/**
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* @brief not used anywhere in the code
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* @todo implement if necessary
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*
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*/
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int _fstat( int file )
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{
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return 0;
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}
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/**
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* @brief not used anywhere in the code
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* @todo implement if necessary
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*
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*/
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int _read( int file,
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char * buf,
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int len )
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{
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return -1;
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}
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/**
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* @brief Write bytes to the UART channel to be displayed on the command line
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* with qemu
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* @param [in] file ignored
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* @param [in] buf buffer to send
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* @param [in] len length of the buffer
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* @returns the number of bytes written
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*/
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int _write( int file,
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char * buf,
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int len )
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{
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int todo;
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for( todo = 0; todo < len; todo++ )
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{
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UART_DR( UART0_ADDR ) = *buf++;
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}
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return len;
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}
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/**
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* @brief function called by malloc and friends to reserve memory on the heap
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* @param [in] incr the amount of bytes to increase or decrease
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* @returns the previous top of the heap
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* @note uses a global variable <b>heap_end</b> to keep track of the previous top
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*/
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void * _sbrk( int incr )
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{
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char * prev_heap_end;
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if( heap_end == 0 )
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{
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heap_end = ( void * ) &_heap_bottom;
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}
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prev_heap_end = heap_end;
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if( ( heap_end + incr ) > ( void * ) &_heap_top )
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{
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return ( void * ) -1;
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}
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heap_end += incr;
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return prev_heap_end;
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}
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#ifdef __cplusplus
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}
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#endif
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