topic Re: lcp2388 UART Tx fifo in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657468#M26126 <HTML><HEAD></HEAD><BODY><P>Did you enable the interrupt? if no, please enable the interrupt in U0IER. &nbsp; &nbsp;</P></BODY></HTML> Fri, 17 Mar 2017 07:55:55 GMT jimmychan 2017-03-17T07:55:55Z lcp2388 UART Tx fifo https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657467#M26125 <HTML><HEAD></HEAD><BODY><P>UART fifo 通过UnLSR寄存器的THER和TEMT位标记fifo中是否有数据，如何能知道fifo中是否已满，或者fifo中剩余空间。我的应用是想用轮询方式发送数据，每次轮询时，如果有需要发送的数据，就将fifo填满，此时fifo可能有剩余字节。但无法知道剩余多少，就只能等fifo空后，再一次性将fifo填入16字节。但这样可能会使两个字节间隔变长导致帧断裂，破坏modbus协议，特在此求助。谢谢大家。</P></BODY></HTML> Thu, 16 Mar 2017 01:28:41 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657467#M26125 fzg 2017-03-16T01:28:41Z Re: lcp2388 UART Tx fifo https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657468#M26126 <HTML><HEAD></HEAD><BODY><P>Did you enable the interrupt? if no, please enable the interrupt in U0IER. &nbsp; &nbsp;</P></BODY></HTML> Fri, 17 Mar 2017 07:55:55 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657468#M26126 jimmychan 2017-03-17T07:55:55Z Re: lcp2388 UART Tx fifo https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657469#M26127 <HTML><HEAD></HEAD><BODY><P>谢谢您的回答，我目前整个项目设计就是想不用中断的方式发送数据，希望能定时器定期轮询的方式发送数据，lpc2388这款芯片可以实现么，谢谢！</P></BODY></HTML> Mon, 20 Mar 2017 00:21:02 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657469#M26127 fzg 2017-03-20T00:21:02Z Re: lcp2388 UART Tx fifo https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657470#M26128 <HTML><HEAD></HEAD><BODY><P>U0IER[1] enables the THRE interrupt for UARTn. The status of this can be read from UnLSR[5].</P><P>UnIER[2] enables the UARTn RX line status interrupts. The status of this interrupt can be read from UnLSR[4:1].</P><P></P><P>U0IER enable 可以只用來查status用, 不是一定要用中断的方式发送数据, 可以继续用轮询的方式发送数据.</P></BODY></HTML> Tue, 21 Mar 2017 01:45:29 GMT https://community.nxp.com/t5/LPC-Microcontrollers/lcp2388-UART-Tx-fifo/m-p/657470#M26128 jimmychan 2017-03-21T01:45:29Z