Hello, I am new to programing with the RPI and Python. I need to connect 2 RPI's to communicate over SPI bus (SPI bus is my special need) to send large data. For some reason i can even pass the characters over the link.
HW configuration are as follows:
RPI - #1 (master) SPI0
MOSI - pin 19
MISO - pin 21
ClK - pin 23 (out)
CE - pin 24 (out)
RPI - #2 (slave) SPI0
MOSI - pin 19
MISO - pin 21
ClK - pin 23 (in)
CE - pin 24 (in)
i wrote small script to send and receive 3 character (from both sides) and loop around for number times. Neither RPI receiving anything. My actual need is to send 1 Meg Byte data over the link (after i get the basics to work). I know there other ways to do it, but there are tech reasons to why i have to use SPI.
BTW, i tried to use a combination for spi.readbytes and spi.writebytes on both sides and that did not work.
i appreciate the help.
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Code for RPI #1
HW configuration are as follows:
RPI - #1 (master) SPI0
MOSI - pin 19
MISO - pin 21
ClK - pin 23 (out)
CE - pin 24 (out)
RPI - #2 (slave) SPI0
MOSI - pin 19
MISO - pin 21
ClK - pin 23 (in)
CE - pin 24 (in)
i wrote small script to send and receive 3 character (from both sides) and loop around for number times. Neither RPI receiving anything. My actual need is to send 1 Meg Byte data over the link (after i get the basics to work). I know there other ways to do it, but there are tech reasons to why i have to use SPI.
BTW, i tried to use a combination for spi.readbytes and spi.writebytes on both sides and that did not work.
i appreciate the help.
-------------------------------------------------
Code for RPI #1
Code:
import spidev # Import the spidev library for SPI communicationimport time # Import the time module for delaysimport RPi.GPIO as GPIO# Initialize SPIbus = 0 # SPI bus (usually 0 or 1)device = 0 # Chip select (CE0 or CE1)GPIO.setmode(GPIO.BOARD)GPIO.setup(24,GPIO.OUT)GPIO.setup(23,GPIO.OUT)spi = spidev.SpiDev() # Create an SPI objectspi.open(bus, device) # Open SPI communicationspi.max_speed_hz = 5000000 # Set SPI speed (5 MHz)spi.mode = 0 # Set SPI mode (0 or 3)# Message to sendmsg = [61, 62, 63] # 2 characterfor _ in range(25): # Repeat 25 times GPIO.output(24,0) time.sleep(0.1) ret=spi.xfer3(msg) # Send/receive message GPIO.output(24,1) time.sleep(0.1) print(msg,ret)spi.close()GPIO.cleanup()--------------------------- The code for RPI 2import spidev # Import the spidev library for SPI communicationimport time # Import the time module for delaysimport RPi.GPIO as GPIO# Set up GPIOGPIO.setmode(GPIO.BOARD) # Use physical pin numberingGPIO.setup(24, GPIO.IN) GPIO.setup(23, GPIO.IN)# Initialize SPIbus = 0 # SPI bus (usually 0 or 1)device = 0 # Chip select (CE0 or CE1)spi = spidev.SpiDev() # Create an SPI objectspi.open(bus, device) # Open SPI communicationspi.max_speed_hz = 5000000 # Set SPI speed (5 MHz)spi.mode = 0 # Set SPI mode (0 or 3)# Message to sendmsg = [50, 51, 52 ] i = 1while True and i < 50: # Repeat for 5 minutes# print("CE signal is: ", GPIO.input(24)) if GPIO.input(24) == 0: ret=spi.xfer3(msg) print(msg,ret) i = i + 1 time.sleep(0.05)spi.close()GPIO.cleanup()Statistics: Posted by RamizEXP — Wed Jul 17, 2024 6:57 am