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126 lines
2.9 KiB
Markdown
126 lines
2.9 KiB
Markdown
# _SPI Slave Example_
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_This example uses ESP8266 hspi Slave to send and receive data to another ESP8266 hspi Master_
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## How to use example
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### Hardware Required
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* Connection:
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| Signal | Slave | Master |
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|-----------|--------|--------|
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| SCLK | GPIO14 | GPIO14 |
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| MISO | GPIO12 | GPIO12 |
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| MOSI | GPIO13 | GPIO13 |
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| CS | GPIO15 | GPIO15 |
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| HANDSHARK | GPIO4 | GPIO4 |
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| GND | GND | GND |
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* Note:
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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.
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```
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Master OFF -> Slave ON -> Master ON
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```
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### Configure the project
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```
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make menuconfig
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```
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* Set serial port under Serial Flasher Options.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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make -j4 flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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* LOG:
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```
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I (221) spi_slave_example: init gpio
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I (223) gpio: GPIO[4]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
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I (234) spi_slave_example: init spi
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I (2516) spi_slave_example: ------Slave read------
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I (2519) spi_slave_example: addr: 0x0
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I (2511) spi_slave_example: read_data[0]: 0x0
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I (2515) spi_slave_example: read_data[1]: 0x11111111
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I (2524) spi_slave_example: read_data[2]: 0x22222222
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I (2533) spi_slave_example: read_data[3]: 0x33333333
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I (2542) spi_slave_example: read_data[4]: 0x44444444
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I (2551) spi_slave_example: read_data[5]: 0x55555555
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I (2560) spi_slave_example: read_data[6]: 0x66666666
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I (2579) spi_slave_example: read_data[7]: 0x77777777
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I (2596) spi_slave_example: ------Slave read------
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I (2599) spi_slave_example: addr: 0x1
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I (2593) spi_slave_example: read_data[0]: 0x1
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I (2601) spi_slave_example: read_data[1]: 0x11111111
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I (2610) spi_slave_example: read_data[2]: 0x22222222
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I (2629) spi_slave_example: read_data[3]: 0x33333333
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I (2638) spi_slave_example: read_data[4]: 0x44444444
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I (2647) spi_slave_example: read_data[5]: 0x55555555
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I (2656) spi_slave_example: read_data[6]: 0x66666666
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I (2655) spi_slave_example: read_data[7]: 0x77777777
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I (2676) spi_slave_example: ------Slave read------
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I (2672) spi_slave_example: addr: 0x2
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I (2689) spi_slave_example: read_data[0]: 0x2
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I (2697) spi_slave_example: read_data[1]: 0x11111111
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I (2706) spi_slave_example: read_data[2]: 0x22222222
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I (2705) spi_slave_example: read_data[3]: 0x33333333
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I (2714) spi_slave_example: read_data[4]: 0x44444444
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I (2723) spi_slave_example: read_data[5]: 0x55555555
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I (2732) spi_slave_example: read_data[6]: 0x66666666
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I (2741) spi_slave_example: read_data[7]: 0x77777777
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```
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* WAVE FORM:
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- SPI_MASTER_WRITE_DATA_TO_SLAVE
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- SPI_MASTER_READ_DATA_FROM_SLAVE
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