Questions tagged [spi]
Serial Peripheral Interface. Allows full-duplex serial communication from a master device to one or more slave devices arranged on a bus. Sometimes referred to as a 4-wire bus.
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connected between 2 arduino
i want to connect SPI 2 arduino master and slave through the MUX , to write and read in external memory , when the master write in memory slave read .
pls help .
code to master
#include <SPI.h&...
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Set SPI MOSI pin to idle low on a Due?
I have an SPI slave connected to Due. I send the SPI slave into sleep mode. During sleep, I need to pull all pins low, including MOSI. What's the best way to pull the SPI-4 pin low on a Due?
Here's a ...
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I2C and SPI using sensor and Oled display
Im currently working on a project which displays vital signs such as pulse and oxygen on my display. Now, my sensor is connected through I2C while my OLED runs through SPI. Im trying to display the ...
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multiple RC522 RFID on arduino yun
I was trying for one month to make multiple RC522 rfid readers work together on SPI on an arduino yun, one works fine, but if I plug 4, each with a specific slave select, only one, sometimes 2, ...
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SPI command versus data?
I have bough an LCD screen display TFT Touch Screen Board For Arduino UNO R3.
Aand the following commands are given to me for the initialization:
write_SPI_commond(0xFF);
write_SPI_commond(0xFF);
...
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Extra `eecfbba=.@aa` file in sd card
I am doing a project, and I need an SD card. Everything worked well, but after a while when I read the SD card from my PC(Windows 10 64 bit, Intel Core), I found a file called eecfbba=.@aa. It's so ...
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Topic: How to draw a circle on LCD128x64?
I want to know what's the default or recommended arithmetic to draw a circle on the LCD128x64 using ST7920 driver.
I've done the following functions:
drawing a pixel at any point on the LCD
sending ...
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Can the ESP-1 use SPI to communicate with sensors?
I wonder if I can use SPI to communicate between ESP-1 ESP8266 module and SPI sensors and other slaves.
If so, do I need to install a library?
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Multiple variant.cpp entries for same physical pin
Some variant.cpp files have more than one entry that points to the same physical pin. For example (from Arduino Zero's file):
// 14..19 - Analog pins
// --------------------
{ PORTA, 2, PIO_ANALOG, ...
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SD Library function doesnt work while using second SPI port with ESP32
i work on a group project with an ESP32. We have a lcd display and a sd card connected via the two SPI ports of the ESP32.
The card gets initialized with no problem using this code:
bool ...
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how to wrire into the contents of the registers in ADMV1013 up converter using arduino Due?
There are nine registers inside and the contents of the registers can be changed to perform several operations. The link of the data-sheet is given here(Page 26). The write cycle sampling must be ...
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Arduino Zero to Arduino Zero SPI configuration
I am in the planning stage of chaning two ATSAMD21 with a Zero or Nano 33 bootloade r in a SPI connection. The rational for this is that i am in need of 30 pin GPIO expansion and using 2 mcp23s17 ...
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SPI communication with Arduino and PGA411-Q1 resolver sensor
I have been trying to implement SPI communication between an Arduino board and a PGA411-Q1 resolver sensor board. I have set up the Arduino SPI settings as indicated on the resolver sensor's datasheet ...
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ESP32-CAM not reading BME680
I am trying to read BME680 on ESP32-CAM with following code :
(Before trying BME680, I have suscessfully connected BME280 to ESP32-CAM over S/W SPI)
#include <Wire.h>
#include <SPI.h>
#...
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What pins can be used for chip select (CS, CC) on the Arduino nano every?
I’ve checked the nano’s tech specs but I can’t seem to find any information regarding it. I’ve tried setting it to pin 26 (digital output)
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How fast should I be able to write to AT45DB321D flash memory?
I checked the AT45DB321D datasheet and it says it operates at either 66 MHz oder 33 MHz. Both of these speeds are higher than what an Arduino Nano supports (my google fu fails me here, but according ...
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SD writing problem
I have an Arduino code for logging sensor data, time and date. Then I store all the data in the SD card and then I will send the sensor value to another node by using Lora. but I can't write the data ...
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can I program a nano over SPI with another nano?
I'm fairly new to arduino, but I want to program a nano over SPI to skip the bootloader. I know I can program the nano with an uno as a programmer to do this, but I don't have an uno, but I do have a ...
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When does interrupt get fired
When does the ISR mapped to SPI_STC_vect (SPI transmission complete) get fired? Does it fire after a byte has been received (eight clock cycles) of when the slave select changes back to high to ...
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Reading data from the MCP3002
I am using a MCP3002 to convert an analog signal to digital data. It works fine actually, sends good data. However; After a while, when the power is turned off and on again a few times, it only ...
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Is it possible to synchronize two SPI busses to send data out in parallel on the same clock signal?
We're working with these very odd driver chips which are sort of like shift registers except rather than latch the data at the end, the latch needs to happen over the last 'n' clock cycles in parallel ...
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AD7476 adc and SPI
I'm trying to understand if I can use the AD7476 with Arduino and SPI:
datasheet
My rough idea is that I should put CS low, then read two bytes using SPI.transfer() twice, and then bring CS high ...
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'TCCR1B' was not declared in this scope
I'm trying to use a MS5540C (digital pressure sensor)
and the sample code has this line:
TCCR1B = (TCCR1B & 0xF8) | 1; //generates the MCLK signal
I'm a bit of a noob to the IoT but its not ...
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How can I connect 6 solenoid locks to an arduino
Im in college and our research is about a fingerprint based door lock system. We really dont have any idea about arduino. Now we bought arduino mega for our research but I dont know how to connect ...
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MPU9250 with Arduino Nano and Arduino Nano 33 BLE
I am trying to read sensor data from two MPU9250s with both one Arduino Nano and a Arduino Nano 33 BLE using SPI. As for the Arduino nano, I was successful to acquire the sensor data and output it in ...
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reference to 'File' is ambiguous. Why am I getting this error?
The program is supposed to take photo and store the picture into the SD card with the timestamp.
My Program Code:
#include <SdFat.h>
#include <Adafruit_VC0706.h>
#include <SPI.h>
#...
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Arduino Due as Triggered DMA SPI Slave is possible?
Is it possible for arduino Due to act as DMA-SPI-slave device which can exchange SPI data (uint16_t TX[10] and RX[10]) in triggered slave mode?
I have a setup in which time period is very short (~...
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Does MFRC522 supports native SPI of Arduino Due?
Does MFRC522 library support native SPI interface of Arduino Due?
By native SPI I mean this one:
I came here with this question because the initializer asks for 2 pins: SS and Reset:
MFRC522(byte ...
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Is the code correct? Nrf24l01
I'm am a beginner, so I'm sorry I have written this wrong.
Is this piece of code correct? If not where?
Transmitter:
#include <SPI.h>
#include "RF24.h"
int* Msg, mSg, msG;
RF24 radio(9, 10);...
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Nano can't get reply from ENC28J60 Ethernet Shield
My Arduino Nano can't get a reply from my new ENC28J60 Ethernet Shield - I can't get any library examples to work. Using the UIPEthernet lib, and running the EchoServer example with logging turned up, ...
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SPI receive register size of ESP32
ESP32 has 64 byte SPI FIFO size, but I could not find what is the largest bit size it can receive over SPI?
P.S. I need to interface a sensor, which returns 32 bit response.
EDIT to clarify why I am ...
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Communication between Arduino and Can Bus
Function mcp2515_get_message appears the following instruction:
uint32_t i1 = (uint32_t) spi_putc(0xff),
i2 = (uint32_t) spi_putc(0xff),
i3 = (uint32_t) spi_putc(0xff),
...
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How to connect two LED strips (APA102/SK9822) to Arduino UNO?
So what I am trying to do is to connect two SK9822 LED strips to Arduino UNO.
I am a bit confused about how to properly set this up so I can individualy control any led. So obviously 5V should go to ...
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Using Arduino to Record analog signals with SPI ADC + Sampling Rate Issue
I am using Arduino UNO to Read 8-channel, 24-bits resolution Analog signals using ADS1299 Analog-fornt-end. ADS1299 use SPI interface to talk with Arduino. Currently, I can record the analog signal ...
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How to connect SPI device on Etherntet shield on Arduino Uno
In my project I need to connect RFID reader (RC522) on top of the Ethernet shield because of it's capability of reading and editing SD card. When I connect only RFID sensor on Arduino, it works. Same ...
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Using the Broadcom AFBR-S50 with Arduino
I'm trying to interface with a Broadcom AFBR-S50MV85G ToF sensor over SPI using an Arduino, which is complicated by the fact that the provided library and reference application is written for Cortex ...
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Write and read problem while interfacing 93LC46B EEPROM through SPI
I try to save and read data from 93LC46B EEPROM using SPI with Arduino UNO.
I'm following this article https://www.arduino.cc/en/Tutorial/SPIEEPROM .
So far I have correctly connected EEPROM pinout (...
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Combining ADC IRQ with SPI peripherals results in SPI not working
I'm working on a pet project that requires ADC, SD card (SPI interface, SdFat library) and a display in the future (also SPI).
I have put together a piece of code that initializes ADC at the highest ...
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Writing to sd card with a sampling rate 50ms or less? I have a sketch that writes to sd every 1s but jams at faster sampling rates. Please help?
My code below reads data from an ADC and 3 digital pins via a Mega and prints to an SD Shield (Deek Robot). I want to be able to read the data every 50ms (20ms ideally). I can't get below 250ms.
I've ...
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ESP12E Boot vs SPI
I was wondering how I could overcome the next issue;
My ESP8266 12E is connected as follows:
GPIO0 ground if needed to program, vcc otherwise
GPIO2 vcc
GPIO15 ground
Bootmodes explained in the this ...
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SPI: test by connecting MOSI to MISO
Is it possible to test a SPI connection by wiring the MISO directly to the MOSI pin? I'm working on a low-level SPI implementation, and I want to check that the library is basically working. It ...
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Velleman KA02 not working on Mega 2560 r3
I have a Velleman KA02 audio shield. When I use this shield on an Arduino UNO R3 with this sample code, it works. And by "work" I mean when I interact with the Serial Monitor (by pressing Y, for ...
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How to utilize SPI Serial bus on a ATSAMD21G18?
Like the title suggests, I have a ATSAMD21G18 microcontroller that I want to interface with a LTC6803-4 chip, but I'm not sure how to set up the SPI bus on the microcontroller, and the datasheet ...
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LCD on top of SD datalogger flickers help!
I have a problem with my 16,2 with buttons lcd shield.(LCD Keypad Shield). It is connected on top of an SD dataloger. I came to the conclusion that every time the sd shield logs data and completes the ...
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SPI - different implementation / timing
I'm a little bit confused. I'm running the same code on a ESP32 (Adafruit Huzzah32) and an Arduino (SparkFun Pro Micro). It works on the ESP32 but not on the Arduino.
Are there different API ...
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OLED DISPLAY USING SPI
My display is not responding to this code. Help please
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define OLED_MOSI 10
#define ...
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Adafruit Micro-SD breakout not initializing on MEGA 2560
]
[I am having quite a bit of trouble trying to get my Arduino MEGA 2560 to read my micro-SD card. My wiring is as follows:
Breakout Arduino
5v 5v
Gnd Gnd
CLK 52
DO ...
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How can I rewrite Arduino Code using SPI library into C++?
The issue is that I have code using an Arduino library and need to convert it into C++ so I can use it with a raspberry pi on ROS (Robot operating system). Does anyone know the best way to change it ...
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Read write with half duplex SPI
I'm currently struggling interfacing an SPI device using just 3 pins (CLK, DATA, NSS).
Wiring up? Connecting MOSI/MISO together?
How do i read since it's half duplex?
In ESP32 there are flags ...
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My PIR sensor output changes but digitalread high all the time
This is my final project, I have to communicate with two wemos d1 mini by LAN. The problem is that when I read the state of the PIR sensor it is "HIGH" all the time, but when I connect the led light, ...
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