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mcuee avatar mcuee commented on August 14, 2024

What is the USB to Serial chipset used for your bootloader and programmer? Some USB to Serial chipsets are problematic.

from avrdude.

gauravahuja avatar gauravahuja commented on August 14, 2024

Hi @mcuee,

You are correct. I was using a 14 year old USB-Serial convertor. The chipset is based on CH340. I get the following details after running system_profiler SPUSBDataType on my terminal.

USB2.0-Serial:

              Product ID: 0x7523
              Vendor ID: 0x1a86
              Version: 2.52
              Speed: Up to 12 Mb/s
              Location ID: 0x02110000 / 3
              Current Available (mA): 500
              Current Required (mA): 96
              Extra Operating Current (mA): 0

This week I bought two new usb-serial convertors. One of them is also a CH340 chipset, but it worked fine. The new CH340 has the following descriptor

USB Serial:

              Product ID: 0x7523
              Vendor ID: 0x1a86
              Version: 2.64
              Speed: Up to 12 Mb/s
              Location ID: 0x02110000 / 3
              Current Available (mA): 500
              Current Required (mA): 98
              Extra Operating Current (mA): 0

So it seems CH340 chipset with Version: 2.64 works but with Version: 2.52 does not.

The other one that I bought is based on CP2102, which also worked.

CP2102 USB to UART Bridge Controller:

              Product ID: 0xea60
              Vendor ID: 0x10c4  (Silicon Laboratories, Inc.)
              Version: 1.00
              Serial Number: 0001
              Speed: Up to 12 Mb/s
              Manufacturer: Silicon Labs
              Location ID: 0x02110000 / 8
              Current Available (mA): 500
              Current Required (mA): 100
              Extra Operating Current (mA): 0

from avrdude.

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