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您好：
我使用pdk_c667x_2_0_6 中的uart驱动程序UART_open(uint32_t index, UART_Params *params);这个函数
请问函数中的第一个参数，index怎么填写？
pdk里的uart例程里有用法。
uint32_t uartTestInstance;......uart = UART_open(uartTestInstance, &uartParams);
