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You will notice that one of the pads doesn’t have all of the solder removed. The pad on the top-left in this photo. This is intentional, to show you a comparison for reference. The other pads are free of solder. Make sure to have a copper wire brush and a wet sponge handy. You wipe the iron on the wire brush and tap it on the wet sponge(to remove oxides) to keep it clean. Always clean your tip constantly. Also, after cleaning it, always re-tin the tip with fresh solder, to prevent the tip from oxidizing! Do not connect the power source until your chip is otherwise properly wired. For instance, do not connect a test clip that has power attached.
The CH341 chip supports a 5V supply voltage or a 3.3V supply voltage. When using a 5V supply voltage, the VCC pin of the CH341 chip inputs an external 5V power supply, and the V3 pin should be externally connected with a power supply decoupling capacitor of 0.01uF to 0.1uF. When working with 3.3V voltage, the V3 pin of the CH341 chip should be connected to the VCC pin, and an external 3.3V power supply is input, and the CH341 core is connected. The CH341A is a USB-based IC for interfacing with SPI devices. In this tutorial, we’ll show you how to install the CH341A drivers and use the CH341A programmer to flash an SPI BIOS chip. It is important to use spispeed=512 or a lower number such as 256 or 128, because otherwise the BBB will be quite unstable. Then you need to install it in the Programmer, making sure the notch faces the same way as indicated in the white diagram in the bottom right corner:
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Wire an SPI flasher, using 2.54mm dupont leads, to the breadboard, using the correct wiring (see link to SPI flashing guides below)
Hi, reading chinese datasheet for CH341 and at end of chapter 5.2 硬件说明 (Hardware description) is stated: Original UART applications are totally compatible without any modification in Windows operating systems. Use quality 60/40 or 63/37 lead+tin solder. Do not use lead-free! Lead-free is not suitable for hobbyist use such as this. Use quality rosin flux. Fluxes with an acid base should never be used. Amtech and MG Chemicals make good flux pastes. Use it in a dispenser tube. Some of these fluxes will contain adapic acid which has a low pH level, and it is simply used as a mild activator. So long as you clean the flux afterwards, you should be fine.
Ch341a USB Mini Programmer
Similarly, the SPI flash chip has a minimum voltage it will accept as a high logic value. This is commonly 0.7*VCC for SPI flash, which is 2.31V for 3.3V chips. If the drive strength is too low, the voltage at the pins of the flash chip may fall below this minimum voltage, causing it to register as a low logic value instead of the high value that was sent. Even without the BIOS chip on the board (at all), something should happen when you press power button, so if that’s not happening without the chip there then there is some other issue If the software announces that the programmer is connected, then press the Read button. Normally the buffer should fill on the interface and the solid lines of FF should be replaced in large part by codes in hexadecimal. If all the lines only have FF codes, then it means that the software could not read the Bios properly. It is unlikely that the chip is completely empty. Why didn’t it work ? because the programmer must be able to send enough energy in at least half of the motherboard to actually read the Bios. It will easily read the Bios in small motherboards, such as tablet, laptop, micro ATX. On the other hand in motherboards of desktop, it will have to power this last one. If the software could not read correctly the Bios, then disconnect the clamp. Reconnect the PC power supply to the motherboard (with both pins), reconnect the power supply to the mains. Reconnect the clamp. Press the Read button. This time the software should read the chip correctly. That’s what worked for me with a motherboard MSI Z77A-G43. If this is still not the case, refer to the help at the end of this article. As I was trying other methods before buying the CH341A programmer, the chip was on a bodged-together carrier board. I thought, however, that my wiring was okay as I could read the correct ID from the chip. if you could not read the chip with the CH341A programmer v1.30, then try another version of the software. The most popular version is the CH341 programmer v1.18. Try other drivers. Try other software.
NOR flashes on libreboot systems run on 3.3V DC or 1.8V DC, and this includes data lines. CH341A has 5V logic levels on data lines, which will damage your SPI flash and also the southbridge that it’s connected to, plus anything else that it’s connected to.
USB Bridge Controller CH341
KedarWolf - saving a BIOS in UEFITool does not convert anything, it simply adds .rom extension to whatever the original file extension is when you save or rebuild/save https://www.digital-kaos.co.uk/forums/showthread.php/894410-Yamaha-Xmax-300-2014-pinout-need?highlight=xmax
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