Design of SPI driver based on ARM embedded system-EEWORLD

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The specific process of the write operation is shown in Figure 1. First, the user data is converted from the space state to the kernel state, and the corresponding receive flag is set. Then the data size is determined. If the data is larger than the buffer space, the data overflows and the write operation ends; if there is no overflow, in order to ensure the data between processes, the process obtains the spin lock, and then determines whether the buffer is empty. According to the introduction of the above two functions, different functions are called in different situations. After the data is written into the ring buffer, the data is sent to the SPI transmit register. When the SPI transmit register sends data, the ring buffer still receives data. If the buffer is full at this time, the spin lock is released, and the process wait flag (wait_Tx_done) is set to put the process to sleep until the data in the transmit register is sent. Then wake up the process to determine whether all the data has been sent. If there is still data waiting to be sent, copy_to_Tx_buf_int is called; if all the data has been sent, the write operation ends. If the buffer is not full, it is determined whether the data has been sent. When all the data has been sent, the send operation ends.

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