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