kopia lustrzana https://gitlab.com/markol/Teathimble_Firmware
172 wiersze
5.4 KiB
C
172 wiersze
5.4 KiB
C
/*
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****************************************************************************
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*
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* simulavr - A simulator for the Atmel AVR family of microcontrollers.
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* Copyright (C) 2013 Markus Hitter <mah@jump-ing.de>
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* ELF storage strategy inspired by simavr by Michel Pollet.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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****************************************************************************
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*
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* $Id$
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*
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* This header provides macros to embed simulator setup information into
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* a compiled ELF binary.
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*
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* Example:
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*
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* Add this somewhere at the root level of your AVR code:
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*
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* #include "simulavr_info.h"
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* SIMINFO_DEVICE("atmega644");
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* SIMINFO_CPUFREQUENCY(F_CPU);
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*
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* Then link as usual, but add these linker flags to avr-gcc to prohibit
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* the linker from removing the info sections at the link stage:
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*
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* -Wl,--section-start=.siminfo=0x900000
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* -u siminfo_device
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* -u siminfo_cpufrequency
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* -u siminfo_serial_in
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* -u siminfo_serial_out
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*
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* The value choosen here to be 0x900000 can be choosen freely, but must
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* be above 0x840400, else it can conflict with program / eeprom / fuses /
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* lockbits / signature data, see ELFLoad() in src/avrreadelf.cpp, line 215ff.
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*
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* Having this done, running the ELF binary in the simulator will
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* automatically inform simulavr for which AVR variant and CPU frequency
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* the binary was built, making the corresponding command line parameters
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* obsolete. In case you give both, in-binary and CLI parameters, CLI
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* parameters take precedence.
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*
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* The really nice thing about this mechanism is, it doesn't alter the
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* executed binary at all. You can upload and run this on real hardware,
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* not a single byte of Flash memory or a single CPU cycle at runtime wasted.
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*/
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#ifndef __SIMULAVR_INFO_H__
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#define __SIMULAVR_INFO_H__
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SIMINFO_SECTION __attribute__((used)) __attribute__((section(".siminfo")))
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enum {
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SIMINFO_TAG_NOTAG = 0, // keep this unused as a protection against empty data
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SIMINFO_TAG_DEVICE,
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SIMINFO_TAG_CPUFREQUENCY,
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SIMINFO_TAG_SERIAL_OUT,
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SIMINFO_TAG_SERIAL_IN,
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};
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struct siminfo_long_t {
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uint8_t tag;
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uint8_t length;
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uint32_t value;
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} __attribute__((__packed__));
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struct siminfo_string_t {
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uint8_t tag;
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uint8_t length;
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char string[9];
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} __attribute__((__packed__));
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struct siminfo_serial_t {
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uint8_t tag;
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uint8_t length;
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char pin[3];
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uint32_t baudrate;
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char filename[2];
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} __attribute__((__packed__));
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/*
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* This gives the device type, like "attiny45", "atmega128", "atmega644", etc.
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*/
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#define SIMINFO_DEVICE(name) \
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const struct siminfo_string_t siminfo_device SIMINFO_SECTION = { \
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SIMINFO_TAG_DEVICE, \
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/* We could use sizeof(siminfo_device) here, but avr-gcc has \
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been seen to set length to 0 (zero), then. */ \
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sizeof(name) + 2, \
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name \
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}
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/*
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* This gives the cpu frequency, like 8000000UL or 16000000UL.
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*/
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#define SIMINFO_CPUFREQUENCY(value) \
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const struct siminfo_long_t siminfo_cpufrequency SIMINFO_SECTION = { \
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SIMINFO_TAG_CPUFREQUENCY, \
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sizeof(uint32_t) + 2, \
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value \
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}
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/*
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* Create a serial in (Rx, to AVR) component. The the sent characters/bytes
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* will be taken from the given file. This component can be connected to the
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* same file as a serial out, if it's a special file like a real serial device
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* or a pipe. Connecting both to the same regular file will mess things up.
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*
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* Using "-" as file name means connecting to the console (stdin/stdout).
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*
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* The pin to connect is named by a 2-character string, where "E2" means
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* pin 2 on port E.
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*
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* Why a baud rate? Well, the component doesn't just write to the UART receive
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* register, but synthesizes actual serial signals on the pin, which in turn
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* should be interpreted by your AVR code. If your code sets a baud rate not
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* matching the one given here, serial communications won't work. Just like a
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* real serial device configured to work at 19200 baud won't work on a real
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* serial port set to something else.
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*
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* Other parameters are fixed to 8N1, which means 8 bits, no parity, 1 stop bit.
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*/
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#define SIMINFO_SERIAL_IN(pin, filename, baudrate) \
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const struct siminfo_serial_t siminfo_serial_in SIMINFO_SECTION = { \
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SIMINFO_TAG_SERIAL_IN, \
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sizeof(char[3]) + sizeof(uint32_t) + sizeof(filename) + 2, \
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pin, \
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baudrate, \
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filename \
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}
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/*
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* Create a serial out (Tx, from AVR) component. Same as above, but the
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* other direction. The serial port pin is continuously read and interpreted.
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*/
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#define SIMINFO_SERIAL_OUT(pin, filename, baudrate) \
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const struct siminfo_serial_t siminfo_serial_out SIMINFO_SECTION = { \
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SIMINFO_TAG_SERIAL_OUT, \
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sizeof(char[3]) + sizeof(uint32_t) + sizeof(filename) + 2, \
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pin, \
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baudrate, \
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filename \
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}
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#ifdef __cplusplus
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};
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#endif
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#endif /* __SIMULAVR_INFO_H__ */
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