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beaglebone black 能不能用PRU扩展soft uart？能的话要怎样操作？
请参考 http://processors.wiki.ti.com/index.php/Soft-UART_Implementation_on_AM335X_PRU_-_Software_Users_Guide
OpenEmbedded Recipes 这个资源下载不了，还有pasm 这个工具哪里能下载
应该在这个包里面：http://processors.wiki.ti.com/index.php/Programmable_Realtime_Unit_Software_Development#Tools_Download
