espressif/ESP8266_RTOS_SDK
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ESP8266_RTOS_SDK/examples/peripherals/spi_master
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README.md

SPI Master Example

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

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 (516) spi_master_example: init gpio
I (526) gpio: GPIO[4]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:1 
I (536) spi_master_example: init spi
I (556) spi_master_example: Master wrote 3200 bytes in 4302 us
I (656) spi_master_example: Master wrote 3200 bytes in 4519 us
I (766) spi_master_example: Master wrote 3200 bytes in 4522 us
I (866) spi_master_example: Master wrote 3200 bytes in 4520 us
I (966) spi_master_example: Master wrote 3200 bytes in 4521 us
I (1066) spi_master_example: Master wrote 3200 bytes in 4520 us
I (1166) spi_master_example: Master wrote 3200 bytes in 4522 us
I (1266) spi_master_example: Master wrote 3200 bytes in 4521 us
I (1366) spi_master_example: Master wrote 3200 bytes in 4520 us
I (1466) spi_master_example: Master wrote 3200 bytes in 4520 us
I (1566) spi_master_example: Master wrote 3200 bytes in 4520 us
I (1666) spi_master_example: Master wrote 3200 bytes in 4519 us
I (1766) spi_master_example: Master wrote 3200 bytes in 4521 us
I (1866) spi_master_example: Master wrote 3200 bytes in 4519 us
I (1966) spi_master_example: Master wrote 3200 bytes in 4520 us

  • WAVE FORM:

    • SPI_MASTER_WRITE_DATA_TO_SLAVE

      wave

    • SPI_MASTER_READ_DATA_FROM_SLAVE

      wave