Hi, please excuse me if this isn't the right place to ask this. I'm new to FPGAs and not sure if my question is related to icestorm/iceprog or just a question about my board.
I have an ice40 up5k breakout board and would like to do RS-232 over the USB cable. This was easy on my icestick, which dedicates one of the FTDI's interfaces to RS-232 pins. I'm stumped getting it to work on my up5k board.
Looking at the UP5k board, schematic, I see interface A's TX/RX pins are connected to the SPI pins SCK and SI. So I thought if I'm not using SPI, I can use those pins for my serial communication.
I shunted the programming shunts vertically and removed the J7 shunt to disable flash.
Then I wrote my verilog code with SCK as the rx pin and SI as the tx pin. I synthesized and programmed the board with yosys/nextpnr, and I verified the board is transmitting data by probing the SI pin.
On the computer side, I see no incoming data on the /dev/ttyUSB? device exposed from the FTDI driver. Nor do I see the board receiving data when I send it from the computer. I also tried to connect to the device with a C program using libftdi. That program connects to the FTDI device successfully, but again, no data going back and forth from its perspective.
I connected the SCK/SI pins to another DB-9/USB cable with an internal FTDI device, and when I do that, I see data going over the line, so I think the verilog implementation is not the problem.
Hi, please excuse me if this isn't the right place to ask this. I'm new to FPGAs and not sure if my question is related to icestorm/iceprog or just a question about my board.
I have an ice40 up5k breakout board and would like to do RS-232 over the USB cable. This was easy on my icestick, which dedicates one of the FTDI's interfaces to RS-232 pins. I'm stumped getting it to work on my up5k board.
Looking at the UP5k board, schematic, I see interface A's TX/RX pins are connected to the SPI pins SCK and SI. So I thought if I'm not using SPI, I can use those pins for my serial communication.
I shunted the programming shunts vertically and removed the J7 shunt to disable flash.
Then I wrote my verilog code with SCK as the rx pin and SI as the tx pin. I synthesized and programmed the board with yosys/nextpnr, and I verified the board is transmitting data by probing the SI pin.
On the computer side, I see no incoming data on the /dev/ttyUSB? device exposed from the FTDI driver. Nor do I see the board receiving data when I send it from the computer. I also tried to connect to the device with a C program using libftdi. That program connects to the FTDI device successfully, but again, no data going back and forth from its perspective.
I connected the SCK/SI pins to another DB-9/USB cable with an internal FTDI device, and when I do that, I see data going over the line, so I think the verilog implementation is not the problem.
I noticed the same behavior as https://github.com/YosysHQ/icestorm/issues/194. I followed the steps in that issue to re-bind the device, but no progress.