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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 (500) spi_slave_example: init gpio
I (500) gpio: GPIO[4]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0 
I (520) spi_slave_example: init spi
I (3390) spi_slave_example: Slave wrote 3200 bytes in 4632 us
I (3490) spi_slave_example: Slave wrote 3200 bytes in 4616 us
I (3590) spi_slave_example: Slave wrote 3200 bytes in 4622 us
I (3690) spi_slave_example: Slave wrote 3200 bytes in 4611 us
I (3790) spi_slave_example: Slave wrote 3200 bytes in 4612 us
I (3890) spi_slave_example: Slave wrote 3200 bytes in 4612 us
I (3990) spi_slave_example: Slave wrote 3200 bytes in 4619 us
I (4090) spi_slave_example: Slave wrote 3200 bytes in 4607 us
I (4190) spi_slave_example: Slave wrote 3200 bytes in 4613 us
I (4290) spi_slave_example: Slave wrote 3200 bytes in 4609 us
I (4390) spi_slave_example: Slave wrote 3200 bytes in 4618 us
I (4490) spi_slave_example: Slave wrote 3200 bytes in 4619 us
I (4590) spi_slave_example: Slave wrote 3200 bytes in 4614 us
I (4690) spi_slave_example: Slave wrote 3200 bytes in 4613 us

  • WAVE FORM:

    • SPI_MASTER_WRITE_DATA_TO_SLAVE

      wave

    • SPI_MASTER_READ_DATA_FROM_SLAVE

      wave