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HCI 缓冲空间问题

Other Parts Discussed in Thread: CC2540

我用notification发送数据包,每个20个字节,只能成功发送4个,后面的notification返回值是MSG_BUFFER_NOT_AVAIL( No HCI buffer is available),我想问下这个HCI缓冲区在哪里设置?我要发送大量数据包的话设定这个可行么?我想做一个cc2540的传输速度测试,有做过相关测试的同学请给些建议。