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");
50 AVR_MMCU_TAG_FREQUENCY,
57 AVR_MMCU_TAG_SIGNATURE,
58 AVR_MMCU_TAG_SIMAVR_COMMAND,
59 AVR_MMCU_TAG_SIMAVR_CONSOLE,
60 AVR_MMCU_TAG_VCD_FILENAME,
61 AVR_MMCU_TAG_VCD_PERIOD,
62 AVR_MMCU_TAG_VCD_TRACE,
67 SIMAVR_CMD_VCD_START_TRACE,
68 SIMAVR_CMD_VCD_STOP_TRACE,
69 SIMAVR_CMD_UART_LOOPBACK,
74 #define _MMCU_ __attribute__((section(".mmcu")))
75 struct avr_mmcu_long_t {
79 } __attribute__((__packed__));
81 struct avr_mmcu_string_t {
85 } __attribute__((__packed__));
87 struct avr_mmcu_addr_t {
91 } __attribute__((__packed__));
93 struct avr_mmcu_vcd_trace_t {
99 } __attribute__((__packed__));
101 #define AVR_MCU_STRING(_tag, _str) \
102 const struct avr_mmcu_string_t _##_tag _MMCU_ = {\
104 .len = sizeof(_str),\
108 #define AVR_MCU_LONG(_tag, _val) \
109 const struct avr_mmcu_long_t _##_tag _MMCU_ = {\
111 .len = sizeof(uint32_t),\
115 #define AVR_MCU_BYTE(_tag, _val) \
116 const uint8_t _##_tag _MMCU_ = { _tag, 1, _val }
119 * This Macro allows you to specify traces for the VCD file output
120 * engine. This specifies a default header, and let you fill in the
123 * const struct avr_mmcu_vcd_trace_t _mytrace[] _MMCU_ = {
124 * { AVR_MCU_VCD_SYMBOL("UDR0"), .what = (void*)&UDR0, },
125 * { AVR_MCU_VCD_SYMBOL("UDRE0"), .mask = (1 << UDRE0), .what = (void*)&UCSR0A, },
127 * This structure will automatically tell simavr to add a VCD trace
128 * for the UART register, and the UDRE0 bit, so you can trace exactly
129 * the timing of the changed using gtkwave.
131 #define AVR_MCU_VCD_SYMBOL(_name) \
132 .tag = AVR_MMCU_TAG_VCD_TRACE, \
133 .len = sizeof(struct avr_mmcu_vcd_trace_t) - 2 + sizeof(_name),\
137 * Specifies the name and wanted period (in usec) for a VCD file
138 * this is not mandatory for the VCD output to work, if this tag
139 * is not used, a VCD file will still be created with default values
141 #define AVR_MCU_VCD_FILE(_name, _period) \
142 AVR_MCU_STRING(AVR_MMCU_TAG_VCD_FILENAME, _name);\
143 AVR_MCU_LONG(AVR_MMCU_TAG_VCD_PERIOD, _period)
146 * It is possible to send "commands" to simavr from the
147 * firmware itself. For this to work you need to specify
148 * an IO register that is to be used for a write-only
149 * bridge. A favourite is one of the usual "GPIO register"
150 * that most (all ?) AVR have.
151 * See definition of SIMAVR_CMD_* to see what commands can
152 * be used from your firmware.
154 #define AVR_MCU_SIMAVR_COMMAND(_register) \
155 const struct avr_mmcu_addr_t _simavr_command_register _MMCU_ = {\
156 .tag = AVR_MMCU_TAG_SIMAVR_COMMAND,\
157 .len = sizeof(void *),\
158 .what = (void*)_register, \
161 * Similar to AVR_MCU_SIMAVR_COMMAND, The CONSOLE allows the AVR code
162 * to declare a register (typically a GPIO register, but any unused
163 * register can work...) that will allow printing on the host's console
164 * without using a UART to do debug.
166 #define AVR_MCU_SIMAVR_CONSOLE(_register) \
167 const struct avr_mmcu_addr_t _simavr_command_register _MMCU_ = {\
168 .tag = AVR_MMCU_TAG_SIMAVR_CONSOLE,\
169 .len = sizeof(void *),\
170 .what = (void*)_register, \
174 * This tag allows you to specify the voltages used by your board
175 * It is optional in most cases, but you will need it if you use
176 * ADC module's IRQs. Not specifying it in this case might lead
177 * to a divide-by-zero crash.
178 * The units are Volts*1000 (millivolts)
180 #define AVR_MCU_VOLTAGES(_vcc, _avcc, _aref) \
181 AVR_MCU_LONG(AVR_MMCU_TAG_VCC, (_vcc));\
182 AVR_MCU_LONG(AVR_MMCU_TAG_AVCC, (_avcc));\
183 AVR_MCU_LONG(AVR_MMCU_TAG_AREF, (_aref));
186 * This the has to be used if you want to add other tags to the .mmcu section
187 * the _mmcu symbol is used as an anchor to make sure it stays linked in.
189 #define AVR_MCU(_speed, _name) \
190 const uint8_t _mmcu[2] _MMCU_ = { AVR_MMCU_TAG, 0 }; \
191 AVR_MCU_STRING(AVR_MMCU_TAG_NAME, _name);\
192 AVR_MCU_LONG(AVR_MMCU_TAG_FREQUENCY, _speed)