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https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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f06330768f
* Add Makefile project for RISC-V QEMU virtpc
This patch adds simple demo directory for QEMU virtpc machine.
A demo just prints Tx/Rx message of queue to serial port, use no
other hardware and use only primary core (currently hart0).
Other cores are simply going to wfi state and execute nothing else.
Example command is:
qemu-system-riscv32 -nographic -machine virt -net none \
-chardev stdio,id=con,mux=on -serial chardev:con \
-mon chardev=con,mode=readline -bios none \
-kernel demo.elf -smp cpus=2 -s
* Fix copyright and URLS of FreeRTOS
* Fix Makefile
* Add Readme.md
* Separate blinky demo from main code
Co-authored-by: alfred gedeon <alfred2g@hotmail.com>
Co-authored-by: Cobus van Eeden <35851496+cobusve@users.noreply.github.com>
Co-authored-by: Carl Lundin <53273776+lundinc2@users.noreply.github.com>
75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
/*
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* FreeRTOS Kernel V10.4.1
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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://www.github.com/FreeRTOS
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*
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* 1 tab == 4 spaces!
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*/
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#include <stdint.h>
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#include "ns16550.h"
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/* register definitions */
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#define REG_RBR 0x00 /* Receiver buffer reg. */
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#define REG_THR 0x00 /* Transmitter holding reg. */
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#define REG_IER 0x01 /* Interrupt enable reg. */
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#define REG_IIR 0x02 /* Interrupt ID reg. */
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#define REG_FCR 0x02 /* FIFO control reg. */
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#define REG_LCR 0x03 /* Line control reg. */
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#define REG_MCR 0x04 /* Modem control reg. */
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#define REG_LSR 0x05 /* Line status reg. */
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#define REG_MSR 0x06 /* Modem status reg. */
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#define REG_SCR 0x07 /* Scratch reg. */
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#define REG_BRDL 0x00 /* Divisor latch (LSB) */
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#define REG_BRDH 0x01 /* Divisor latch (MSB) */
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/* Line status */
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#define LSR_DR 0x01 /* Data ready */
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#define LSR_OE 0x02 /* Overrun error */
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#define LSR_PE 0x04 /* Parity error */
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#define LSR_FE 0x08 /* Framing error */
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#define LSR_BI 0x10 /* Break interrupt */
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#define LSR_THRE 0x20 /* Transmitter holding register empty */
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#define LSR_TEMT 0x40 /* Transmitter empty */
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#define LSR_EIRF 0x80 /* Error in RCVR FIFO */
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static uint8_t readb( uintptr_t addr )
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{
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return *( (uint8_t *) addr );
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}
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static void writeb( uint8_t b, uintptr_t addr )
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{
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*( (uint8_t *) addr ) = b;
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}
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void vOutNS16550( struct device *dev, unsigned char c )
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{
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uintptr_t addr = dev->addr;
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while ( (readb( addr + REG_LSR ) & LSR_THRE) == 0 ) {
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/* busy wait */
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}
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writeb( c, addr + REG_THR );
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}
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