Questions 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.
504
questions
0
votes
0
answers
11
views
Raspberry Pi 3B shows a screen with an underscore in the corner
I am using a raspberry pi 3B v1.2 with a 3.5 inch kuman display as shown here. I have installed the lcd-show drivers by doing this:
sudo rm -rf LCD-show
git clone https://github.com/goodtft/LCD-show....
0
votes
1
answer
29
views
rpi SPI works if I run python via ssh but not working if I start the py file in /etc/rc.local
So, to explain further.
I have a raspberry pi Model 3B which I run headless. I have a python3 script with which I communicate via SPI with a 3rd party board. According to the manufacturer I need to ...
- 511
0
votes
0
answers
48
views
Cannot determine pins to use when connecting 3 SPI devices to Pi 5
I am trying to connect 3 SPI devices to my pi 5, they are all RFID-RC522 modules and so they all have the same device id, so I put them on separate busses.
I researched and selected these three ...
- 101
0
votes
1
answer
27
views
#include files for https://www.kernel.org/doc/html/v4.14/driver-api/spi.html Pi5 C/C++ development
Referring to https://www.kernel.org/doc/html/v4.14/driver-api/spi.html
Writing code to use the SPI API's on a Pi5(RP1). The spec shows the basic Structs for each SPI API. Those structs contain ...
- 11
0
votes
0
answers
15
views
RPI 4 with LS7366R encoder counter chip with incremental photoelectric rotary encoder
I have raspberry Pi 4 and it is connected to LS7366R, but I am not using the CS0 or cs1, am using any GPIO and controlling it (high/low) manually.
the encoder has A and B signals, and they are ...
- 1
1
vote
1
answer
58
views
Get display working on SPI1
I'm trying to get a waveshare 4.2inch E-Ink Display Module Compatible with Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/WH/Zero 2W Series Boards 400x300 Resolution SPI Interface working on a Raspberry ...
- 113
0
votes
1
answer
32
views
Change which pin is used for SPI SCLK
I'm trying to get a waveshare 4.2inch E-Ink Display Module Compatible with Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/WH/Zero 2W Series Boards 400x300 Resolution SPI Interface working on a Raspberry ...
- 113
0
votes
0
answers
33
views
How soon can I use SPI to communicate with a peripheral after boot?
So, I'm building a device involving a raspberry pi (Pi4) and an e-ink display, with SPI communication. I'm wondering what the soonest would be, I could communicate with the display. Main idea here is, ...
- 1
0
votes
0
answers
19
views
SPI with Bookworm OS - Change SPI Clock Speed [duplicate]
Is it possible to adjust the Clock speed of the SPI device from the terminal/CLI?
- 11
1
vote
2
answers
150
views
Using SPI and GPIO in Pi OS Bookworm on Pi 3b v1.2
How can I control GPIO from the CLI when I have SPI enabled?
I need to add a reset signal to an application that issues the reset via a shell script, prior to launching the application. The ...
- 11
0
votes
0
answers
23
views
Delay between writes of two spi.xfer for sending data to DAC
I am using Raspberry pi 3 for sending data through a DAC through SPI communication. Right now I am using AD5686 which is connected to the raspberry pi using SPI communication SPI0 (SCLK to CLK of DAC, ...
-1
votes
1
answer
55
views
Digital potentiometer X9C104P with a Raspberry Pi 5
I've tried using a Raspberry Pi 5 to control a digital potentiometer X9C104P. I followed this wiring diagram:
Potentiometer (POT) - Raspberry Pi
INC: GPIO20
UD: GPIO21
Vh: 5V
Vss: GND
Vcc: 5V
CS: ...
0
votes
0
answers
44
views
Reading from MT6816 magnetic encoder with SPI connection using Python on Raspberry Pi 4
I am totally new to the field, don't really know what I'm doing and in need of help. I'm trying to read an absolute angle using an MT6816 14-bit magnetic encoder via SPI connection using Python on ...
0
votes
0
answers
26
views
Problem when testing module DAC MCP4922 with Raspberry Pi
I'm encountering an issue while testing a custom-designed DAC module that utilizes an MCP4922 chip as its primary processor.
The vendor provided C language test code for ESP32-S3, but I intend to test ...
- 11
0
votes
0
answers
29
views
Implementing Precise Timing between values with Raspberry Pi and 16-bit DAC using py-spidev
I want to send values from an RPi to a DAC in order to generate an analog signal. The DAC is 16 bits, and I'm using the py-spidev library. Let's say I have a pre-prepared list of 1000 16-bit values ...
