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Allocate GPIOs for SPI/SDcard interface? #44
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I have been working on a ili9341 TFT waterfall, I've provisionally allocated allocated these pins.
Obviously, I'm not actually using the MISO pin, but thought it made sense to allocate it so that the SPI could be used with other peripherals such as SD card or similar. I will ditch the RST pin if I can, and might try to double up the DC pin with something else too if I can. I would like to keep GPIO28 spare for a microphone input, and 3 other pins for TX functions. Perhaps we should allocate GPIO9 as SD card CS pin? |
Since you are asking, what are your plans for the SD card? |
@mryndzionek suggested sd card recording in the #15 features discussion issue @dawsonjon re: PIN_CS on gpio 13 vs 9. Not sure there's much benefit one way or the other.
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If you go the I2C expander route, you could "just" use another Pico. It is a bit more expensive than a MCP23017 but gives more options. |
Quad core radio :) Beware the I2C MCP23017 - silicon bugs require A7 and B7 be set to outputs |
What about the bandpass filter control pins (2, 3, 4)? The breadboard version doesn't use those pins. |
Ideally the one firmware would work on both with no runtime config. For best image rejection (and noise) you should really use the band select filters. |
As I was looking for other ways to add buttons. Can ADC2 be used to add a keypad? |
I'm quite keen to keep the spare ADC input as a mic input when I add TX capability. It will probably double as a morse paddle input too. Another option to consider is to add an IR remote. Only needs one IO pin... IR remotes are also very cheap, often cheaper than a keypad. |
Not a really serious suggestion but something to be inspired by: |
SPI1 on GPIO10,11,12,13 ?
and maybe GPIO 14 and 15 for additional SPI slave selects (or multiplexing via a HC139 ?)
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