mirror of
https://github.com/pvvx/RTL00_WEB.git
synced 2024-11-22 22:14:19 +00:00
23 lines
877 B
Text
23 lines
877 B
Text
|
Example Description
|
||
|
|
|
||
|
|
This example describes how to use SPI read/write by mbed api.
|
||
|
|
|
||
|
|
|
||
|
|
The SPI Interface provides a "Serial Peripheral Interface" Master.
|
||
|
|
|
||
|
|
This interface can be used for communication with SPI slave devices,
|
||
|
|
such as FLASH memory, LCD screens and other modules or integrated circuits.
|
||
|
|
|
||
|
|
In this example, it use 2 sets of SPI. One is master, the other is slave.
|
||
|
|
By default it use SPI0 as slave, and use SPI2 as master.
|
||
|
|
So we connect them as below:
|
||
|
|
Connect SPI0_MOSI (PC_2) to SPI2_MOSI (PA_1)
|
||
|
|
Connect SPI0_MISO (PC_3) to SPI2_MISO (PA_0)
|
||
|
|
Connect SPI0_SCLK (PC_1) to SPI2_SCLK (PA_2)
|
||
|
|
Connect SPI0_CS (PC_0) to SPI2_CS (PA_4)
|
||
|
|
|
||
|
|
Because some GPIOA are used as SDIO purpose which has higher priority.
|
||
|
|
So we need pull high PA_7 when device boot up.
|
||
|
|
Connect PA_7 to 3V3
|
||
|
|
|
||
|
|
After boot up, the master will send data to slave and shows result on LOG_OUT.
|