fatsdraw_MSP_EXP430FR5994_TI示例程序中，加入下面代码后报错
System_printf("Board_LED0_ON\n");
System_flush();
错误提示：Write error: Invalid File ID (65535) in CIO message!
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fatsdraw_MSP_EXP430FR5994_TI示例程序System_printf（）报错
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