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/* vim: set sts=4:sw=4:ts=4:noexpandtab
simusb.c
Copyright 2012 Torbjorn Tyridal <ttyridal@gmail.com>
This file is part of simavr.
simavr is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
simavr is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with simavr. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/mman.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <libgen.h>
#include <pthread.h>
#include "sim_avr.h"
#include "avr_ioport.h"
#include "sim_elf.h"
#include "sim_hex.h"
#include "sim_gdb.h"
#include "vhci_usb.h"
#include "sim_vcd_file.h"
struct vhci_usb_t vhci_usb;
avr_t * avr = NULL;
avr_vcd_t vcd_file;
struct avr_flash {
char avr_flash_path[1024];
int avr_flash_fd;
};
// avr special flash initalization
// here: open and map a file to enable a persistent storage for the flash memory
void avr_special_init( avr_t* avr, void *data)
{
struct avr_flash *flash_data = (struct avr_flash *)data;
//puts(" --=== INIT CALLED ===--");
// release flash memory if allocated
if(avr->flash) free(avr->flash);
// open the file
flash_data->avr_flash_fd = open(flash_data->avr_flash_path,
O_RDWR|O_CREAT, 0644);
if (flash_data->avr_flash_fd < 0) {
perror(flash_data->avr_flash_path);
exit(1);
}
// resize and map the file the file
(void)ftruncate(flash_data->avr_flash_fd, avr->flashend + 1);
avr->flash = (uint8_t*)mmap(NULL, avr->flashend + 1, // 32k is multiple of 4096
PROT_READ|PROT_WRITE, MAP_SHARED, flash_data->avr_flash_fd, 0);
if (!avr->flash) {
fprintf(stderr, "unable to map memory\n");
perror(flash_data->avr_flash_path);
exit(1);
}
}
// avr special flash deinitalization
// here: cleanup the persistent storage
void avr_special_deinit( avr_t* avr, void *data)
{
struct avr_flash *flash_data = (struct avr_flash *)data;
//puts(" --=== DEINIT CALLED ===--");
// unmap and close the file
munmap( avr->flash, avr->flashend + 1);
close(flash_data->avr_flash_fd);
// signal that cleanup is done
avr->flash = NULL;
}
int main(int argc, char *argv[])
{
// elf_firmware_t f;
const char * pwd = dirname(argv[0]);
struct avr_flash flash_data;
avr = avr_make_mcu_by_name("at90usb162");
if (!avr) {
fprintf(stderr, "%s: Error creating the AVR core\n", argv[0]);
exit(1);
}
strcpy(flash_data.avr_flash_path, "simusb_flash.bin");
flash_data.avr_flash_fd = 0;
// register our own functions
avr->custom.init = avr_special_init;
avr->custom.deinit = avr_special_deinit;
avr->custom.data = &flash_data;
//avr->reset = NULL;
avr_init(avr);
avr->frequency = 8000000;
// this trick creates a file that contains /and keep/ the flash
// in the same state as it was before. This allow the bootloader
// app to be kept, and re-run if the bootloader doesn't get a
// new one
{
char path[1024];
uint32_t base, size;
snprintf(path, sizeof(path), "%s/../%s", pwd, "at90usb162_cdc_loopback.hex");
uint8_t * boot = read_ihex_file(path, &size, &base);
if (!boot) {
fprintf(stderr, "%s: Unable to load %s\n", argv[0], path);
exit(1);
}
printf("Bootloader %04x: %d\n", base, size);
memcpy(avr->flash + base, boot, size);
free(boot);
avr->pc = base;
avr->codeend = avr->flashend;
}
// even if not setup at startup, activate gdb if crashing
avr->gdb_port = 1234;
if (0) {
//avr->state = cpu_Stopped;
avr_gdb_init(avr);
}
vhci_usb_init(avr, &vhci_usb);
vhci_usb_connect(&vhci_usb, '0');
while (1) {
avr_run(avr);
}
}
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