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Newest 'spi' Questions - Raspberry Pi Stack Exchange
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Learn more about TeamsQuestions tagged [spi]
The SPI bus, Serial Peripheral Interface, is a synchronous serial communication interface for short distance communication, e.g. between components in an embedded system such as the Pi. Devices communicate in full duplex mode using a master-slave architecture with a single master. The master device (typically the Pi) initates all communications.
496 questions
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Quad SPI setting CM4S(lite) for SD card connections
I m working with a CM4s on a custom board with a connection to the quad spi connection on pins 10,12,16,18,22,24 as per page 16 of the data sheet. We are having problems with the SD card connection ...
0
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0
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26
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What is the DMA frame end (as referred in the official manual)
The official data sheet contains a remark that the TA bit in SPI_CS register is automatically reset on "dma_frame_end impulse" (see p 138 Table 160 SPI_CS register).
However there is no ...
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0
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How to use a Pimoroni 1.3" SPI Colour Square LCD with pico & MicroPython?
I want to use the 1.3" SPI Colour Square LCD (240x240) with a pico and micropython. According to the website that is possible. However, when looking at the github page of examples there is ...
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2
answers
54
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0
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1
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3
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59
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Pi5 dtoverlay=spi0-2cs creates SPI objects, dtoverlay=spi5-1cs does not
Using Linux rasp5Dev 6.12.20+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.20-1+rpt1~bpo12+1 (2025-03-19) aarch64 GNU/Linux.
Attempting dtoverlay=spi?-1cs, substituting the values 1 through 6. All fail to ...
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1
answer
126
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1
vote
1
answer
504
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Raspberry Pi 5 SPI Problems
I currently have a custom hat with ADCs that communicate via SPI. I am using a Raspberry Pi 4 with a C program to perform measurements at a frequency of 50 kHz, and everything is working well. However,...
3
votes
0
answers
97
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Why irq/186-spi0.0 takes 25% of CPU time (a RS485 hat)
I have a number of Rpi 5.0. I used to use SPI0.0 there using one of these CAN/RS485 hats like this (there is the hat's pinout on that page). It worked without problem. Yet, there was that irq/186-spi0....
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44
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0
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276
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Qualcomm QCA7000 over SPI on Raspberry Pi 4b
I'm attempting to connect a RED BEET Qualcomm QCA7000 board over SPI to a Raspberry Pi 4B. I've added the dtoverlay=qca7000 to the config.txt and wired up the board with the Pi GPIO pins according to ...
2
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0
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172
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Changing SPI mode from multi to single on Raspberry Pi 5
I'm trying to connect my Raspberry Pi 5 to Arduino via SPI inteface.
As a reference, I've used connection scheme and code from this manual on penguintutor and it worked like a charm.
But in my project ...
0
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1
answer
105
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No SPI0 MISO pin on Raspberry PI 3B +
I had to reinstall my Raspberry Pi, now with Raspberry Pi OS bookworm, keeping the hardware. I am using a MCP3008 ADC converter with the new Adafruit libraries as https://learn.adafruit.com/raspberry-...
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1
answer
116
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My ST7735 TFT Display is showing stuff cursed
I am trying to display text on my display but it shows stuff very weirdly, it's hardly readable. I am using the Raspberry Pi Zero 2 W with the Raspberry Pi Os Lite 64 bit.
I have SPI activated.
This ...
0
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0
answers
22
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Acceleration and Gyroscope read 0 on the ICM 20468
I'm trying to read from the ICM 20948 using a Pico W, however, whenever I read from the acceleration and gyroscope addresses I get 0. What could be the problem?
imu.c
void init_imu(IMU* imu) {
...
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