The functionality of the MAX232 IC can be tested by connecting the RX and TX pins together and typing a character into the terminal.
If the typed character does not appear or only noise is displayed, then the reasons may be as follows:
- the power line is broken: Vcc is missing or GND is floating (broken wire),
- the voltage is unstable or lower than +5V,
- the Maxim IC is faulty.
If the MAX232 receives Vcc voltage (+5V) and the GND pins are also connected between the power source (such as USB port) and the other devices (RS232 pin 5 and the GND on the UART port of the box), the converter power should be OK.
If the bootloader has been overwritten (or just erased its area), I have a strong suspicion that we will not get anything through UART.
But I have never met one like this before, so I don't know for sure. I think chewitt has more experience with this.
At what percentage does the USB Burning Tool stop?
Quote from 'Amlogic Platform USB Burning Tool V2 User Guide - Revision 1.0.pdf'
Progress bar percentage:
- 0~2%:
During this stage:
1) If erase_bootloader is selected, then erase Bootloader and reboot.
2) Initialize burning environment and get the icon resources etc., from burning package.
! If burning fails and stay at 2%. It means flash initialization fails! - 2%~5%:
This stage is for flash initialization. If erase_flash is selected, it will also erase flash. - 6%~94%:
This stage is for burning the data partitions except for Bootloader. If the progress bar stops here, it means partition burning fails. - 96%~98%:
This stage is for burning bootloader. - 100%:
Burn successfully.
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