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ESP8266_RTOS_SDK/examples/peripherals/spi_slave
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README.md

SPI Slave Example

This example uses ESP8266 hspi Slave to send and receive data to another ESP8266 hspi Master

How to use example

Hardware Required

  • Connection:
Signal Slave Master
SCLK GPIO14 GPIO14
MISO GPIO12 GPIO12
MOSI GPIO13 GPIO13
CS GPIO15 GPIO15
HANDSHARK GPIO4 GPIO4
GND GND GND
  • Note:

When the ESP8266 is powered on, it is necessary to keep the GPIO15 low to enter the Flash mode, so the Master and the Slave have different power-on sequences.

Master OFF -> Slave ON -> Master ON

Configure the project

make menuconfig
  • Set serial port under Serial Flasher Options.

Build and Flash

Build the project and flash it to the board, then run monitor tool to view serial output:

make -j4 flash monitor

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

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

  • LOG:
I (221) spi_slave_example: init gpio
I (223) gpio: GPIO[4]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (234) spi_slave_example: init spi
I (2516) spi_slave_example: ------Slave read------

I (2519) spi_slave_example: addr: 0x0

I (2511) spi_slave_example: read_data[0]: 0x0

I (2515) spi_slave_example: read_data[1]: 0x11111111

I (2524) spi_slave_example: read_data[2]: 0x22222222

I (2533) spi_slave_example: read_data[3]: 0x33333333

I (2542) spi_slave_example: read_data[4]: 0x44444444

I (2551) spi_slave_example: read_data[5]: 0x55555555

I (2560) spi_slave_example: read_data[6]: 0x66666666

I (2579) spi_slave_example: read_data[7]: 0x77777777

I (2596) spi_slave_example: ------Slave read------

I (2599) spi_slave_example: addr: 0x1

I (2593) spi_slave_example: read_data[0]: 0x1

I (2601) spi_slave_example: read_data[1]: 0x11111111

I (2610) spi_slave_example: read_data[2]: 0x22222222

I (2629) spi_slave_example: read_data[3]: 0x33333333

I (2638) spi_slave_example: read_data[4]: 0x44444444

I (2647) spi_slave_example: read_data[5]: 0x55555555

I (2656) spi_slave_example: read_data[6]: 0x66666666

I (2655) spi_slave_example: read_data[7]: 0x77777777

I (2676) spi_slave_example: ------Slave read------

I (2672) spi_slave_example: addr: 0x2

I (2689) spi_slave_example: read_data[0]: 0x2

I (2697) spi_slave_example: read_data[1]: 0x11111111

I (2706) spi_slave_example: read_data[2]: 0x22222222

I (2705) spi_slave_example: read_data[3]: 0x33333333

I (2714) spi_slave_example: read_data[4]: 0x44444444

I (2723) spi_slave_example: read_data[5]: 0x55555555

I (2732) spi_slave_example: read_data[6]: 0x66666666

I (2741) spi_slave_example: read_data[7]: 0x77777777

  • WAVE FORM:

    • SPI_MASTER_WRITE_DATA_TO_SLAVE

      wave

    • SPI_MASTER_READ_DATA_FROM_SLAVE

      wave