fpga-computer/tusb-blaster

TI TUBS3410 USB cleint Stack + USB Blaster Clone

tusb-blaster's Issues

Porting to EFM8UB1 MCU ?

This looks a very cool project, but the TUSB3410 is quite expensive ($6+), and needs a Crystal.
Since you started this, SiLabs have released low cost 1T 8051 USB devices, that may be a better fit ?

I also see here http://ixo-jtag.sourceforge.net/archive/ixo_de_usb_jtag.html
that author started C8051F32x/F34x porting some years back, and those parts are predecessors to the EFM8UB1. (earliest ones were 24MHz SysCLK, 48MHz USB, newer are 48MHz for both CPU & USB)

Mouser shows EFM8UB10F8G-C-QFN20 for 81c 1+
There are also 8k, 16k choices and QFN20, QFN28 or QSOP24 packages.
The newest EFM8UB1 (2016) also have a boot-loader, allowing simpler firmware updates.

I've been looking to see if the SPI port can be used dynamically for the byte-level ByteBlaster, but this will need some testing on the hand-over details between Bit-Mode and Byte-Mode.
SPI has a 4 byte FIFO and can do 48MHz/(2 * (SPI0CKR + 1)) bit rates (suggests 12MHz max), so that should manage the bulk transfers of JTAG well.

Software-only JTAG is of course simpler, and could be used for proof of concept work.