I have been able to successfully get either device working, but not both together. Select all [ Kernel trailer DTOK property says yes Because in your case the clock nodes both have the same name which in my opinion ought to be OK because they are effectively local to each device , the second clock instance never gets created and the second driver instance hangs around waiting for it. Board index All times are UTC. The registers are shift 3 positions left because the UART’s internal register select are the bits 3: Thanks for your assistance!
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Linux source code: drivers/tty/serial/sc16is7xx.c (v) – Bootlin
Because in your case the clock nodes both have the same name which in my opinion ought to be OK because they are effectively local to each devicethe second clock instance never gets created and liinux second driver instance hangs around waiting for it. I started compiling locally but a quick search in the forum tells me it will take 5hs or more. What is the correct solution in this situation and how to reduce 25ms latency in Linux Kernel?
Original Attachment has been moved to: So, it seems that the DTB file name matters. Your feedback or suggestions are also welcome. Priorities won’t solve your problem completely anyway, because there’s always a chance for another unrelated IRQ to arise between your IRQ and the process. But queued work is performed within 25ms after interrupt occurs. In the example channel 0 is used.
sc16ia752 Device tree loaded to 0x2fffc size 0x3ef8 Thanks for your assistance! Loaded overlay ‘i2c-rtc’ I’ve tried to play with the priorities and scheldule policies, but it also did not give the desired results.
There might be a bug with using multiple instances of the driver. The devices are connected to spi0 on CS0 and CS1.
SC16IS752 – Bare metal example project
I’m trying to port an old project in which, over the years, I ran out of RAM. The registers are shift 3 positions left because the UART’s internal register select are the bits 3: And I faced the problem of long latencies. Failed to load overlay ‘spi-gpio-cs’.
Sc16is725 any data is transmitted or received, the master must send the address of the receiver via the SDA line. It’s hard to tell where these 25ms come from exactly without doing profiling on your system. Sign up or log in Sign up using Google. I will set up a VM with Ubuntu tonight and cross-compile.
Is rpi-upgrade still possible or do I have to compile the kernel after each upgrade? Does “dmesg -l lnux show anything interesting? If you are building your own kernel, you can see if the module is loaded using lsmod.
In the DT case the name can either come from the “clock-output-names” property or, in its absence, the name of the node that declares the clock. One function is performed about ms.
Select all [ I’m asking that, cause I’m prototyping with the Raspberry Pi. Initialization of the bridge to perform the communication. I 2 C data write and read operations. If you look at other SPI overlays e.
SC16IS – Bare metal example project | NXP Community
But besides that I need to recompile the kernel and so on I I read about that here: Board index All times are UTC. I will play around with this and let you know the results.
But after this time, FIFO is overflowed and data lost bytes transmits in 26ms.