Hi, I'm with a problem during the blink example with my MPW5 board. @jeffdi @Tim Edwards When I use the caravel Nucleo Board + STM Nucleo Board, I get:

Success: Found one matching FTDI device at <ftdi://ftdi:232>h:1:d/1

Caravel data:

mfg        = ffff

product    = ff

project ID = ffffffff

Resetting Flash...

status = 0x00

JEDEC = b'000000'

Winbond SRAM not found

But when I use just the Caravel Nucleo (unplugging the STM Nucleo Board), I get:

Success: Found one matching FTDI device at <ftdi://ftdi:232>h:1:e/1

Caravel data:

mfg        = 0456

product    = 11

project ID = 00051890

Resetting Flash...

status = 0x00

JEDEC = b'ef4016'

Erasing chip...

done

status = 0x0

setting address to 0x0

addr 0x0: flash page write successful

addr 0x100: flash page write successful

addr 0x200: flash page write successful

addr 0x300: flash page write successful

addr 0x400: flash page write successful

addr 0x500: flash page write successful

addr 0x600: flash page write successful

addr 0x700: flash page write successful

total_bytes = 2048

status reg_1 = 0x0

status reg_2 = 0x2

************************************

verifying...

************************************

status reg_1 = 0x0

status reg_2 = 0x2

setting address to 0x0

addr 0x0: *** read compare FAILED ***

b'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'

<----->

I have to go back and refresh my memory on the Nucleo board setup. But I know that as soon as you plug the Nucleo board in, the Nucleo takes control of the chip, so the only way to communicate with the board is through the Nucleo's micropython interface. The code in the

utils/

directory only applies to the board running in standalone mode (which works okay for flashing the part, but has issues with configuring the GPIOs, which is why we have the Nucleo board).

So, should I use the Nucleo without the STM32 board to run the blink example?

For MPW-2 through MPW-5, if you use the Caravel Nucleo hat board standalone, you are likely not to get a correct GPIO configuration. The Nucleo board is programmed to run a calibration step that determines how to best attempt to get a workable configuration programmed into the GPIO. It will program the flash accordingly. If you then remove the hat from the Nucleo board, there are enough differences in power supply voltages that the configuration is unlikely to work; even ambient temperature changes can cause the configuration to fail. This is not to say that it will necessarily fail if you run the Caravel board standalone, but from experience, I have not had much luck doing that.

Got it, so I have this

Winbond SRAM not found

. I've been looking in the Caravel Issues and this slack, but any consistent solution. Some suggestion?