DAC 18 bits (VGA) + Wifi

Todo aquello que acompaña a la placa del ZX-Uno (carcasas, alimentadores, pegatinas para el teclado, etc) / Everything that goes with the ZX-Uno board (cases, AC adapters, stickers for keyboard, etc)
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jsj
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor jsj » 28 Jul 2017, 18:32

Recibido el add-on, instalado en el ZX-GO+ y ¡¡¡funcionando perfectamente!!! :chocala!: :plasplas:

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yombo
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor yombo » 29 Jul 2017, 08:28

Me alegro! A disfrutar! :-)

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SevenFFF
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor SevenFFF » 19 Feb 2018, 17:12

What would be the easiest way of getting direct access to the UART without wifi? I would like to connect a 3v3 USB FTDI cable (something like this) to the Uno, compile a UART into the ZX core, and do some remote debugging.

Can I use the core that's been modified modified for Antonio's wifi board, without his board? Can I connect the RXD, TXD and GND pins of the FTDI cable straight to the Uno expansion socket? What would the pinout for that be?

I see there are resistors on Antonio's wifi board. Are they for the DAC, or are they needed for the UART connection?
Última edición por SevenFFF el 19 Feb 2018, 20:30, editado 1 vez en total.
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azesmbog
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor azesmbog » 19 Feb 2018, 18:57

SevenFFF escribió:I see there are resistors on Antonio's wifi board. Are they for the DAC, or are they needed for the UART connection?

RX\TX как раз напрямую, без резисторов
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SevenFFF
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor SevenFFF » 19 Feb 2018, 19:30

Awesome, thank you azesmbog!
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SevenFFF
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor SevenFFF » 19 Feb 2018, 19:50

Is that pins 10/11/12 of J10?
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antoniovillena
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor antoniovillena » 19 Feb 2018, 22:03

SevenFFF escribió:Is that pins 10/11/12 of J10?


Yes. You only need these 3 pins. They are in rightmost part (orientating the ZX-Uno with expansion at top left) of the middle (second) row.
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ZX-Uno · Clon de ordenador ZX Spectrum basado en FPGA

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SevenFFF
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor SevenFFF » 20 Feb 2018, 07:23

THanks Antonio! I haven't had time to try compiling the core yet. I will probably have some questions when I do :)
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SevenFFF / Threetwosevensixseven / colonel32
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yombo
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor yombo » 20 Feb 2018, 07:36

SevenFFF escribió:THanks Antonio! I haven't had time to try compiling the core yet. I will probably have some questions when I do :)


The core needed to run the WiFi has just the UART support, you don't need to recompile it. The .zx1 files are available (link is in the first post)

Beware that the ZXUno (or better said, the sinthetic Z80 inside it) is too slow to read continuous bytes received from the UART. For this reason exists the wire RTS, which is an output from the ZX-Uno and tells the external device to stop sending bytes because it is busy. The ZX-Uno internal UART buffer is only one byte of lenght.

Not all devices implement the RTS signal, especially the USB-TTL converters. The ESP8266 _does_ support RTS.

If you are not sending two bytes consecutively to the ZX-Uno, you can use a USB-TTL without RTS/CTS support and leave RTS in the ZX-Uno disconnected.

The RTS signal is called CTS in the other (external) device.

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SevenFFF
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Re: DAC 18 bits (VGA) + Wifi

Mensajepor SevenFFF » 20 Feb 2018, 19:10

Thanks yombo. I will try first with your Test_24 in an alternate core. My project needs EXP25 or above, so I will need to build EXP25 or EXP26 eventually :)
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SevenFFF / Threetwosevensixseven / colonel32
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