Low-Level-SPI.md

@@ -16,7 +16,8 @@ Those GPIOs are:
 - **MISO**: communication from slave to master (Master Input Slave Output)
 - **MOSI**: communication master to slave (Master Output Slave Input)
 
-> :warning: **The SPI is a _syncronous bus_: while the master is writing to `MOSI`, the slave is writing to `MISO`.**
+> :warning: **The SPI is a _synchronous bus_: while the master is writing to `MOSI`, the slave is writing to `MISO`.**
+> ![SPI](images/spi/spi.png)
 
 Consider that the GPIOs associated to the SPI bus (`SPI1` in this example) can vary according to the microcontroller you are using. For the STM32F407VG, the needed GPIOs are
 `PA5`, `PA6` and `PA7`.