spi_slave_simple

SPI Slave Simple

This example shows how to configure SPI slave by POSIX APIs, this decreases dependence on hardware and platform.

How to Use Example

Before project configuration and build, be sure to set the correct chip target using idf.py set-target <chip_name>. And this example should be used together with SPI Master Simple.

Hardware Required

• 2 development boards based on espressif SoC
• 2 USB cables for power supply and programming
• 5 DuPont lines connecting SPI pins and GND between 2 development boards

Configure the Project

Open the project configuration menu (idf.py menuconfig).

In the Example Configuration menu:

• Select SPI port in the Select SPI Device option, please note that not all SoC supports SPI3
• Set the SPI pins number in the following options according to your development board:
  • SPI CS Pin Number
  • SPI SCLK Pin Number
  • SPI MOSI Pin Number
  • SPI MISO Pin Number

Build and Flash

Run idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

Example Output

As you run the example ,you will see the following log:

I (0) cpu_start: Starting scheduler on APP CPU.
I (344) ext_vfs: Extended VFS version: 0.3.0
Opening device /dev/spi/2 for writing OK, fd=3.
Receive total 32 bytes from device: SPI Tx 0
Receive total 32 bytes from device: SPI Tx 1
Receive total 32 bytes from device: SPI Tx 2
Receive total 32 bytes from device: SPI Tx 3
Receive total 32 bytes from device: SPI Tx 4
Receive total 32 bytes from device: SPI Tx 5
Receive total 32 bytes from device: SPI Tx 6
Receive total 32 bytes from device: SPI Tx 7
Receive total 32 bytes from device: SPI Tx 8
Receive total 32 bytes from device: SPI Tx 9
Receive total 32 bytes from device: SPI Tx 10
Receive total 32 bytes from device: SPI Tx 11