Raspberry Pi - SPI Communication
You want to read 4 bytes from an SPI sensor repeatedly every second. Which code snippet correctly implements this using spidev?
You want to read 4 bytes from an SPI sensor repeatedly every second. Which code snippet correctly implements this using spidev?
hard🚀 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify continuous reading with delay
import spidev import time spi = spidev.SpiDev() spi.open(0, 0) while True: data = spi.xfer2([0, 0, 0, 0]) print(data) time.sleep(1) uses a while loop with time.sleep(1) to read 4 bytes repeatedly every second.Step 2: Verify correct SPI transfer method
import spidev import time spi = spidev.SpiDev() spi.open(0, 0) while True: data = spi.xfer2([0, 0, 0, 0]) print(data) time.sleep(1) uses spi.xfer2() with 4 zero bytes to read data, which is correct. Other options use invalid methods or do not loop.Final Answer:
The code with the while True loop, spi.xfer2([0, 0, 0, 0]), and time.sleep(1) -> Option DQuick Check:
Use while loop + spi.xfer2() + sleep for repeated reads [OK]
Quick Trick: Use while loop with spi.xfer2() and time.sleep() for repeated reads [OK]
Common Mistakes:
MISTAKES- Using spi.read() which does not exist
- Not looping for repeated reads
- Using spi.write() instead of xfer2()
Master "SPI Communication" in Raspberry Pi
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore Raspberry Pi Quizzes