This example code is used for the M031 series microcontroller (MCU) to send and receive data between SPI and 4 UARTs.
There are two projects in the example. A master project in the Master directory communicates with slave through SPI, sets SPI bus clock frequency to 16 MHz, sends data to slave at intervals, reads and parses slave data after detecting the slave request, and records and prints the length of the transmitted data. A slave project in the Slave directory parses and sends data to other devices through UARTs after receiving SPI data from master, and similarly encodes data and notifies master to read data after receiving UART data from other devices. This document introduces the example code of SPI clock frequency and role setting, PDMA Basic operation mode and Scatter-Gather operation mode setting, and SPI+PDMA transmission and judgment of transmission completion.