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25 lines
1 KiB
Text
25 lines
1 KiB
Text
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Example Description
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This example describes how to use SPI stream 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, we use config SPI_IS_AS_MASTER to decide if device is master or slave.
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If SPI_IS_AS_MASTER is 1, then device is master.
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If SPI_IS_AS_MASTER is 0, then device is slave.
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We connect wires as below:
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master's MOSI (PC_2) connect to slave's MOSI (PC_2)
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master's MISO (PC_3) connect to slave's MISO (PC_3)
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master's SCLK (PC_1) connect to slave's SCLK (PC_1)
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master's CS (PC_0) connect to slave's CS (PC_0)
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This example shows master sends data to slave.
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We bootup slave first, and then bootup master.
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Then log will presents that master sending data to slave.
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To ensure the order is correct, we use a GPIO pin to notify the master that the slave device is ready to write or read data.
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