I have two Jetson Nano devices that need to exchange data over SPI protocol. It is my first and only project with Jetson Nano, so I am completely new to the SPI or anything regarding low-level coding. In the project, I want to use Daisy Chain to communicate, for starters I have used only two device…

You can using my dtb to confirm device tree configure.

Hii @ShaneCCC , Output of loopback test : root@b2qt-jetson-nano-emmc:~# ./spidev_test -D/dev/spidev1.0 -s18000000 -n10 -g30 -p4 transfer ioctl error: -1 transfer ioctl error: -1 transfer ioctl error: -1 transfer ioctl error: -1 transfer ioctl error: -1 transfer ioctl error: -1 transfer ioctl error…

Hii @ShaneCCC , what else can I try to make it working. Thank You.

Could you check with below command. ./spidev_test -D /dev/spidev1.0 -g8 -zz

Hii @ShaneCCC , $./spidev_test -D /dev/spidev1.0 -g8 -zz using device: /dev/spidev1.0 setting spi mode for read,write setting spi bpw setting max speed for rd/wr spi mode: 0 bits per word: 8 bytes per word: 1 max speed: 10000000 Hz (10000 KHz) no. runs: 1 Using seed:0x5f673610 loop count = 0 using…

Your PINs configure looks like incorrect. You can try devmem2 to write it like my REG dump and run the spidev_test command to verify. [image] prasad.suralkar: Bank: 1 Reg: 0x70003064 Val: 0x00006004 -> spi2_mosi_pb4 Bank: 1 Reg: 0x70003068 Val: 0x00006044 -> spi2_miso_pb5 Bank: 1 Reg: 0x7000306…

Hii @ShaneCCC , I have edited pinmux but the result is same, Pinmux settings $ cat /sys/kernel/debug/tegra_pinctrl_reg | grep -i spi Bank: 1 Reg: 0x70003050 Val: 0x0000e004 -> spi1_mosi_pc0 Bank: 1 Reg: 0x70003054 Val: 0x0000e044 -> spi1_miso_pc1 Bank: 1 Reg: 0x70003058 Val: 0x0000e004 -> spi1_sc…

Did you short pin 37/22 for loopback test?

Hii @ShaneCCC , Thank you for your support. Loopback test does not work on slave, it gives error but the master slave communication worked fine but I just want to ask that [image] ShaneCCC: Bank: 1 Reg: 0x70003064 Val: 0x00006044 -> spi2_mosi_pb4 Bank: 1 Reg: 0x70003068 Val: 0x00006044 -> spi…

Hii @ShaneCCC , I have couple of questions, I have done the pinmux setting according to technical guide provided by NVIDIA for jetson nano, but spidev_test passes only when we set pinmux settings according to your pinmux, I dont understand why is that happens. How we can send our data like patter…

Master-Slave Communication Between Two Jetson Nano over SPI

Robotics & Edge Computing Jetson Systems Jetson Nano

ShaneCCC August 24, 2022, 5:08pm 53

Try this

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Master-Slave Communication Between Two Jetson Nano over SPI

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