Search found 13 matches

by marc4444
Wed Jul 15, 2020 8:21 pm
Forum: MicroPython pyboard
Topic: Pyboard with RS485
Replies: 0
Views: 119

Pyboard with RS485

Hi, I'm doing some tests with the Pyboard and a RS485 driver chip. The chip is connected to one of the UARTs and has an 'enable' pin which is connected to an IO. The pin needs to be raised before the UART sends and then lowered after. Currently i'm doing this in software and it works, but I'm hoping...
by marc4444
Mon Apr 06, 2020 6:41 am
Forum: General Discussion and Questions
Topic: Mboot SPI Flash Question
Replies: 7
Views: 540

Re: Mboot SPI Flash Question

In case anyone else has this issue - it turns out that the problem was that I was using the internal crystal rather than an external crystal on my custom board. Micropython supports this but MBOOT did not, I spoke with Damien and he's adding a fix in main.c in mboot for this so shouldn't be an issue...
by marc4444
Wed Apr 01, 2020 4:13 pm
Forum: General Discussion and Questions
Topic: Mboot SPI Flash Question
Replies: 7
Views: 540

Re: Mboot SPI Flash Question

Thanks for the detailed reply Jimmo - going through each of your points: You have a custom board definition that is very similar to PYBV11 but with mboot in sector 0, filesystem in sectors 1, sector 2 unused (?), and code (inc ISR) at sector 3 onwards. Yes this is correct. And good spot I had missed...
by marc4444
Tue Mar 31, 2020 9:18 pm
Forum: General Discussion and Questions
Topic: Mboot SPI Flash Question
Replies: 7
Views: 540

Re: Mboot SPI Flash Question

Ah ok understood - i think they are slightly different (below) and the call to update_mpy() references the location/length of the SPI flash. 0x08000000<< Mboot start 0x80000000<< SPI Flash start Any other ideas on what could be causing it just to hang without deleting anything? I wasn't sure if it n...
by marc4444
Tue Mar 31, 2020 9:05 pm
Forum: General Discussion and Questions
Topic: Mboot SPI Flash Question
Replies: 7
Views: 540

Re: Mboot SPI Flash Question

Hi David, Thanks for the quick reply - My understanding is yes mboot is at 0x08000000 but I don't see how the DFU image starts at the same address? I thought the 'TEXT0_ADDR = 0x0800C000' shifts the ISR after the filesystem, leaving 0x08000000 free for MBOOT. I've pasted both memory files that are i...
by marc4444
Tue Mar 31, 2020 5:04 pm
Forum: General Discussion and Questions
Topic: Mboot SPI Flash Question
Replies: 7
Views: 540

Mboot SPI Flash Question

Hi all, I've built a custom board with the STM32F12CE (that's working fine with micropython after a new board definition) and I'm trying use MBOOT to load firmware from an SPI memory chip (32M-BIT Winbond W25Q32JV). I've previously got MBOOT working with the pyboard lite and a similar SPI memory chi...
by marc4444
Mon Mar 16, 2020 9:25 am
Forum: MicroPython pyboard
Topic: Most efficient searching within large bytearrays
Replies: 5
Views: 756

Re: Most efficient searching within large bytearrays

Thanks Robert - any ideas from anyone on a more efficient way than the function I posted are appreciated?

Best,
Marc
by marc4444
Sun Mar 15, 2020 8:05 pm
Forum: MicroPython pyboard
Topic: Most efficient searching within large bytearrays
Replies: 5
Views: 756

Re: Most efficient searching within large bytearrays

Hi Robert, Thanks for the quick reply, see below prints on the REPL. I'm just using a pyboard, do I have some old version or something? I should have added to my original post that I'm trying to do the .find() on the bytearray. Thanks! Print from Pyboard: >>> a = bytearray(20) >>> a.find(b'\r\n') Tr...
by marc4444
Sun Mar 15, 2020 6:28 pm
Forum: MicroPython pyboard
Topic: Most efficient searching within large bytearrays
Replies: 5
Views: 756

Most efficient searching within large bytearrays

Hi All, I've created a large (2000) bytearray with a memoryview to read a UART into. The commands that the UART is receiving can sometimes take a while to arrive, so I'd like to check for a specific finish character sequence within the bytearray in a loop. I've noticed that Micropython doesn't suppo...
by marc4444
Sun Jan 12, 2020 6:46 pm
Forum: MicroPython pyboard
Topic: Loading Files via JTAG
Replies: 4
Views: 638

Re: Loading Files via JTAG

Thanks for the comments on this. As a temporary method I've just been programming upy onto the board via STLInk and done what christmas9 suggested and configured a UART REPL to start up and program our boot files over UART onto the SPI Flash. Will have a look at reading off a complete image and prog...