YaR Posted May 24, 2018 Share Posted May 24, 2018 Need to have working both SPI0 and SPI1 on Orange Pi Plus 2. Linux orange 4.14.40-sunxi #155 SMP Sat May 12 11:12:46 CEST 2018 armv7l armv7l armv7l GNU/Linux ARMBIAN 5.44.180510 nightly Ubuntu 16.04.4 LTS 4.14.40-sunxi SPI Double overlay installed (https://github.com/armbian/sunxi-DT-overlays/blob/master/examples/spi-double-spidev-bus.dts) I can see both spi's ls /dev/spi* /dev/spidev0.0 /dev/spidev1.0 I know all SPI0 pins - 19, 21, 23, 24 SPI1 pin CS = 8, CLK = 10 but what is MOSI and MISO? How do I know where they are (or even select) ? Link to comment Share on other sites More sharing options...
martinayotte Posted May 24, 2018 Share Posted May 24, 2018 SPIO1_MOSI is PA15 and SPI1_MISO is PA16. According to orangepi-plus-h3-v1_1.pdf schematic, the PA15 is used by STATUS_LED and PA16 is used by MUTE. Since they are in currently used, SPI1 is not available. To go around that, you would need to tweak DT or FEX to have those STATUS_LED/MUTE disconnected ... Link to comment Share on other sites More sharing options...
YaR Posted May 24, 2018 Author Share Posted May 24, 2018 Sorry, but which pins PA15 and PA16 on th scheme above? 4 minutes ago, martinayotte said: To go around that, you would need to tweak DT Can you give a point to start to? Link to comment Share on other sites More sharing options...
martinayotte Posted May 24, 2018 Share Posted May 24, 2018 They are not provided on the GPIO header ... Grab the schematic from https://forum.armbian.com/applications/core/interface/file/attachment.php?id=2 You will see that the only way to get those PA15/PA16 is to solder tiny wires on proper side of R59 and R132. Ouups ! Schematic link doesn't work, here I'm adding it in attachment. orangepi-plus-h3-v1_1.pdf 1 Link to comment Share on other sites More sharing options...
YaR Posted May 24, 2018 Author Share Posted May 24, 2018 So sad :( Can I connect 2 displays (small TFT and larger TFT with touch - actually 3 SPI devices) to SPI0 ? - TFT with touch - https://aliexpress.com/item/3-5-Inch-320-X-480-TFT-LCD-Display-Touch-Board-For-Raspberry-Pi-2-Model/32631471521.html?spm=a2g0v.10010108.1000016/B.1.6be451f6odXBwj&isOrigTitle=true - small TFT - https://ru.aliexpress.com/item/1-8-inch-SPI-TFT-LCD-Display-Module-ST7735-128x160-51-AVR-STM32-ARM-8-16/32817088094.html?spm=a2g0v.10010108.1000016/B.1.29732a62QrOuol&isOrigTitle=true Link to comment Share on other sites More sharing options...
zador.blood.stained Posted May 24, 2018 Share Posted May 24, 2018 1 hour ago, YaR said: Can I connect 2 displays (small TFT and larger TFT with touch - actually 3 SPI devices) to SPI0 ? In theory - yes, but keep in mind that the bus bandwidth will be split between 3 devices so you'll get lower FPS and worse touch screen responsiveness than if they were connected to dedicated SPI controllers. You will need to add extra GPIO chip selects using this as an example and add 3 slave SPIdev devices like here. 1 Link to comment Share on other sites More sharing options...
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