[Solved] You want to send a command byte 0xA5 followed by data bytes [0x01, 0x02, 0x03] to an SPI display using... Which code correctly sends the command first, then the data, assuming spi is already opened? | Raspberry Pi

Raspberry Pi - SPI Communication

You want to send a command byte 0xA5 followed by data bytes [0x01, 0x02, 0x03] to an SPI display using spidev. Which code correctly sends the command first, then the data, assuming spi is already opened?

Aspi.writebytes([0xA5, 0x01, 0x02, 0x03])

Bspi.xfer2([0xA5, 0x01, 0x02, 0x03])

Cspi.xfer2([0xA5]); spi.xfer2([0x01, 0x02, 0x03])

Dspi.writebytes([0xA5]); spi.writebytes([0x01, 0x02, 0x03])

Step-by-Step Solution

Solution:

Step 1: Understand command and data separation
Many SPI displays require sending command and data separately to distinguish them.
Step 2: Check code options
spi.xfer2([0xA5]); spi.xfer2([0x01, 0x02, 0x03]) sends command byte first, then data bytes in separate calls, matching typical display protocol.
Final Answer:
spi.xfer2([0xA5]); spi.xfer2([0x01, 0x02, 0x03]) -> Option C
Quick Check:
Separate command and data transfers [OK]

Quick Trick: Send command and data in separate SPI transfers [OK]

Common Mistakes:

MISTAKES

Sending command and data in one transfer
Using writebytes() which may not return response
Not separating command from data

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More Raspberry Pi Quizzes

Which code correctly sends the command first, then the data, assuming spi is already opened?

Step 1: Understand command and data separation

Step 2: Check code options

Final Answer:

Quick Check:

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