void prepareExtFlash(void)
{
extFlashWake();
// check if old records exist
DataPacket_t packet;
bool oneInvalid = false;
extFlashAddress = EXT_FLASH_RESERVED;
while (extFlashAddress < EXT_FLASH_SIZE) {
extFlashRead(extFlashAddress, &packet, sizeof(packet));
// PRINT("read packet:\n");
// printPacket(&packet);
bool valid = true;
if (packet.crc != crc16((uint8_t *)&packet, sizeof(packet) - sizeof(uint16_t))) {
valid = false;
} else {
if (packet.dataSeqnum == 0) valid = false;
}
if (valid) {
oneInvalid = false;
} else {
// XXX: this is supposed to find first non-packet, but it will find first two invalid packets!!
if (!oneInvalid) {
oneInvalid = true;
} else {
extFlashAddress -= sizeof(packet);
break;
}
}
extFlashAddress += sizeof(packet);
}
PRINTF("flash packet offset=%lu\n", extFlashAddress - EXT_FLASH_RESERVED);
}
//-------------------------------------------
// Entry point for the application
//-------------------------------------------
void appMain(void)
{
PRINTF("\n\nAccelerometer data gathering app\n");
extFlashWake();
// start with clean and new...
cleanFlash();
accelOn();
userButtonEnable(onUserButton);
mdelay(START_DELAY);
uint16_t lastSecond;
uint16_t samplesPerSecond;
for (;;) {
while (!isActiveMode);
redLedOn();
lastSecond = getTimeSec();
samplesPerSecond = 0;
uint16_t i;
for (i = 0; isActiveMode; i++) {
if (i % 10 == 0) redLedToggle();
uint32_t now = getTimeMs();
uint32_t endTime = now + MAIN_LOOP_LENGTH;
Packet_t p;
p.timestamp = now;
p.acc_x = accelReadX();
p.acc_y = accelReadY();
p.acc_z = accelReadZ();
printPacket(&p);
samplesPerSecond++;
uint16_t currentSecond = getTimeSec();
if (currentSecond != lastSecond) {
PRINTF("samples per second = %u\n", samplesPerSecond);
lastSecond = currentSecond;
samplesPerSecond = 0;
}
while (timeAfter32(endTime, getTimeMs()));
}
redLedOff();
}
}
bool prepareExtFlash(void)
{
extFlashWake();
extFlashAddress = EXT_FLASH_RESERVED;
// // check if old records exist
// Record_t old;
// extFlashRead(EXT_FLASH_RESERVED, &old, sizeof(old));
// if (old.magicNumber == MAGIC_NUMBER
// && old.crc == crc16((uint8_t *)&old, sizeof(Record_t) - sizeof(uint16_t))) {
// return true;
// }
// return false;
return true;
}
int main(void)
{
// Make sure all interrupts are disabled.
// This must be the first step, because in some cases interupt vectors are totally wrong
// (e.g. when we get here after a soft reboot from another application)
msp430ClearAllInterruptsNosave();
msp430WatchdogStop();
ledsInit();
flashLeds(LEDS_BOOTLOADER_START);
BootParams_t bootParams;
intFlashRead(BOOT_PARAMS_ADDRESS, &bootParams, sizeof(bootParams));
++bootParams.bootRetryCount;
if (bootParams.bootRetryCount > MAX_RETRY_COUNT) {
bootParams.bootRetryCount = 0;
bootParams.extFlashAddress = GOLDEN_IMAGE_ADDRESS;
bootParams.doReprogramming = 1;
}
// make sure internal flash address is sane
if (bootParams.intFlashAddress == 0xffff || bootParams.intFlashAddress < BOOTLOADER_END) {
bootParams.intFlashAddress = SYSTEM_CODE_START;
}
// read voltage, and quit if not enough for writing in flash
if (readVoltage() < THRESHOLD_VOLTAGE) {
flashLeds(LEDS_LOW_BATTERY);
goto exec;
}
// write the updated info back in flash
intFlashErase(BOOT_PARAMS_ADDRESS, sizeof(bootParams));
intFlashWrite(BOOT_PARAMS_ADDRESS, &bootParams, sizeof(bootParams));
if (bootParams.doReprogramming) {
redLedOn();
// will be using external flash
extFlashInit();
extFlashWake();
uint32_t extAddress = bootParams.extFlashAddress;
// read number of blocks
uint16_t imageBlockCount;
extFlashRead(extAddress, &imageBlockCount, sizeof(uint16_t));
extAddress += 2;
while (imageBlockCount) {
// read a block from external flash
ExternalFlashBlock_t block;
extFlashRead(extAddress, &block, sizeof(block));
if (block.crc != crc16((uint8_t *)&block, sizeof(block) - 2)) {
// the best we can do is to reboot now;
// after a few tries the golden image will be loaded
flashLeds(LEDS_CRC_ERROR);
// no need to disable all of the interrupts (they already are),
// just write in watchdog timer wihout password, it will generate reset.
watchdogRebootSimple();
}
bool firstBlockInChunk = block.address & 0x1;
block.address &= ~0x1;
if (firstBlockInChunk) {
// prepare internal flash to be written
intFlashErase(block.address, INT_FLASH_SEGMENT_SIZE);
}
// program internal flash
COMPILE_TIME_ASSERT(sizeof(block.data) == INT_FLASH_BLOCK_SIZE, ifs);
intFlashWriteBlock(block.address, block.data, INT_FLASH_BLOCK_SIZE);
--imageBlockCount;
extAddress += sizeof(ExternalFlashBlock_t);
}
extFlashSleep();
redLedOff();
}
#if ENABLE_BOOT_DELAY
// delay for a second or so to allow the user to interrupt booting (by pressing the reset button)
flashLeds(LEDS_BOOTLOADER_END);
#endif
// execute the program
exec:
((ApplicationStartExec)bootParams.intFlashAddress)();
}
bool prepareExtFlash(void)
{
extFlashWake();
extFlashAddress = EXT_FLASH_RESERVED;
return true;
}