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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
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* FreeRTOS Kernel V10.2.1
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* Copyright (C) 2019 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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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/*
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* startup.c
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* Author Jefferson L Smith, Robotronics Inc.
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*
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* __premain() is the startup code to init hardware and ram to execute the
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* C application.
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*
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*/
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#include <sys/ports.h>
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#include "cpu.h"
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void ATTR_NEAR __premain (void);
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void
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__premain (void)
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{
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// in case special mode enabled, avoid conflict on PORTE
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PEAR |= NECLK;
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// bgnd mode stops COP and RTI clocks
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COPCTL = RSBCK;
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// stops TCNT counter when debugging stops
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TSCR1 |= (1<<5); // TFRZ
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// PLL
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CLKSEL = 0; // disable PLL to configure
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// xtal 16MHz, bus 24MHz
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SYNR = 3 - 1;
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REFDV = 2 - 1;
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while (!(CRGFLG & 0x08)) // wait for PLL LOCK
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cop_optional_reset();
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CLKSEL |= 0x80; // use PLL
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// init switch inputs
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PERH = 0xff; // pullups
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// outputs
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#if PORT_LED==M6811_PORTB //PORTB
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DDRB = 0xff; // init LED
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#elif PORT_LED==M6811_PORTA //PORTA
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DDRA = 0xff;
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#elif PORT_LED==M6811_PTT //PTT
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DDRT = 0xff;
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#elif PORT_LED==M6811_PTM //PTM
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DDRM = 0xff;
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#elif PORT_LED==M6811_PTP //PTP
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DDRP = 0xff;
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#elif PORT_LED==M6811_PTH //PTH
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DDRH = 0xff;
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#endif
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}
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