4 Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
6 This file is part of simavr.
8 simavr is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 simavr is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with simavr. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef __AVR_MCU_SECTION_H__
23 #define __AVR_MCU_SECTION_H__
26 * This header is used to pass "parameters" to the programmer or the simulator,
27 * it tags the ELF file with a section that contains parameters about the physical
28 * AVR this was compiled for, including the speed, model, and signature bytes.
30 * A programmer software can read this and verify fuses values for example, and a
31 * simulator can instanciate the proper "model" of AVR, the speed and so on without
32 * command line parameters.
36 * #include "avr_mcu_section.h"
37 * AVR_MCU(F_CPU, "atmega88");
46 AVR_MMCU_TAG_FREQUENCY,
50 AVR_MMCU_TAG_SIGNATURE,
51 AVR_MMCU_TAG_VCD_FILENAME,
52 AVR_MMCU_TAG_VCD_PERIOD,
53 AVR_MMCU_TAG_VCD_TRACE,
58 #define _MMCU_ __attribute__((section(".mmcu")))
59 struct avr_mmcu_long_t {
63 } __attribute__((__packed__));
65 struct avr_mmcu_string_t {
69 } __attribute__((__packed__));
71 struct avr_mmcu_vcd_trace_t {
77 } __attribute__((__packed__));
79 #define AVR_MCU_STRING(_tag, _str) \
80 const struct avr_mmcu_string_t _##_tag _MMCU_ = {\
86 #define AVR_MCU_LONG(_tag, _val) \
87 const struct avr_mmcu_long_t _##_tag _MMCU_ = {\
89 .len = sizeof(uint32_t),\
93 #define AVR_MCU_BYTE(_tag, _val) \
94 const uint8_t _##_tag _MMCU_ = { _tag, 1, _val }
96 #define AVR_MCU_VCD_SYMBOL(_name) \
97 .tag = AVR_MMCU_TAG_VCD_TRACE, \
98 .len = sizeof(struct avr_mmcu_vcd_trace_t) - 2 + sizeof(_name),\
101 // specified the nane and wanted period (usec) for a VCD file
102 // thid is not mandatory, a default one will be created if
103 // symbols are declared themselves
104 #define AVR_MCU_VCD_FILE(_name, _period) \
105 AVR_MCU_STRING(AVR_MMCU_TAG_VCD_FILENAME, _name);\
106 AVR_MCU_LONG(AVR_MMCU_TAG_VCD_PERIOD, _period)
109 * This the has to be used if you want to add other tags to the .mmcu section
110 * the _mmcu symbol is used as an anchor to make sure it stays linked in.
112 #define AVR_MCU(_speed, _name) \
113 const uint8_t _mmcu[2] _MMCU_ = { AVR_MMCU_TAG, 0 }; \
114 AVR_MCU_STRING(AVR_MMCU_TAG_NAME, _name);\
115 AVR_MCU_LONG(AVR_MMCU_TAG_FREQUENCY, _speed)