void usb_msc_start (void)
{
init_usb_msc_device();
// call USB interrupt handler continuously
while (1) {
USBHwISR();
}
}
int main() {
// DeInit NVIC and SCBNVIC
NVIC_DeInit();
NVIC_SCBDeInit();
/* Configure the NVIC Preemption Priority Bits:
* two (2) bits of preemption priority, six (6) bits of sub-priority.
* Since the Number of Bits used for Priority Levels is five (5), so the
* actual bit number of sub-priority is three (3)
*/
NVIC_SetPriorityGrouping(0x05);
NVIC_SetVTOR(0x00000000);
#ifdef UARTDEBUG
uart_init();
#endif
BlockDevInit();
#ifdef UARTDEBUG
if (1) {
U32 size;
BlockDevGetSize(&size);
DBG("Found SD card of size %d", size);
BlockDevGetBlockLength(&size);
DBG("block length %d", size);
}
#endif
if (bootloader_button_pressed() || (user_code_present() == 0)) {
DBG("entering bootloader");
init_usb_msc_device();
for (;usb_msc_not_ejected();)
USBHwISR();
DBG("usb ejected, rebooting");
USBHwConnect(FALSE);
spi_close();
}
else {
if ((r = f_mount(0, &fatfs)) == FR_OK) {
if ((r = f_open(&f, "/firmware.bin", FA_READ | FA_OPEN_EXISTING)) == FR_OK) {
unsigned int fs = f_size(&f);
DBG("found firmware.bin with %u bytes", fs);
if ((fs > 0) && (fs <= USER_FLASH_SIZE)) {
U8 buffer[FLASH_BUF_SIZE];
for (unsigned int i = 0; i < fs; i += FLASH_BUF_SIZE) {
unsigned int j = FLASH_BUF_SIZE;
if (i + j > fs)
j = fs - i;
DBG("writing %d-%d", i, i+j);
if ((r = f_read(&f, buffer, j, &j)) == FR_OK) {
// pad last block to a full sector size
while (j < FLASH_BUF_SIZE) {
buffer[j++] = 0xFF;
}
write_flash((unsigned int *) (USER_FLASH_START + i), (char *) &buffer, j);
}
else {
DBG("read failed: %d", r);
i = fs;
}
}
r = f_close(&f);
r = f_unlink("/firmware.bck");
r = f_rename("/firmware.bin", "/firmware.bck");
}
}
else {
DBG("open \"/firmware.bin\" failed: %d", r);
}
#ifdef GENERATE_FIRMWARE_CUR
if (f_open(&f, "/firmware.bck", FA_READ | FA_OPEN_EXISTING)) {
f_close(&f);
}
else {
// no firmware.bck, generate one!
if (f_open(&f, "/firmware.bck", FA_WRITE | FA_CREATE_NEW) == FR_OK) {
U8 *flash = (U8 *) USER_FLASH_START;
f_close(&f);
}
}
#endif
// elm-chan's fatfs doesn't have an unmount function
// f_umount(&fatfs);
}
else {
DBG("mount failed: %d", r);
}
spi_close();
if (user_code_present()) {
DBG("starting user code...");
execute_user_code();
}
else {
DBG("user code invalid, rebooting");
}
}
NVIC_SystemReset();
}
