LPC Microcontrollers中的主题 UART3 RS485 Not Transmitting? https://community.nxp.com/t5/LPC-Microcontrollers/UART3-RS485-Not-Transmitting/m-p/519151#M3010 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by tetwin11 on Thu Oct 31 08:16:54 MST 2013</STRONG><BR /><SPAN>I'm setting up UART3 on a RS485 bus.</SPAN><BR /><BR /><SPAN>The RS485 transceiver has power.</SPAN><BR /><SPAN>The transmit enable line is pulled to enable the transceiver.</SPAN><BR /><SPAN>UART3 peripheral has power</SPAN><BR /><SPAN>Pins are initialized</SPAN><BR /><SPAN>Baud rate is set</SPAN><BR /><SPAN>The FIFOs are enabled via FIFO Control Register</SPAN><BR /><SPAN>Transmit is enabled via Transmit Enable Register</SPAN><BR /><BR /><SPAN>When I write a byte to Transmit Holding Register, the Line Status Register indicates that the THR contains data, but it is not sending.</SPAN><BR /><BR /><SPAN>Any ideas on what I'm missing?</SPAN><BR /><BR /><SPAN>Thanks!</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:39:28 GMT lpcware 2016-06-15T17:39:28Z UART3 RS485 Not Transmitting? https://community.nxp.com/t5/LPC-Microcontrollers/UART3-RS485-Not-Transmitting/m-p/519151#M3010 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by tetwin11 on Thu Oct 31 08:16:54 MST 2013</STRONG><BR /><SPAN>I'm setting up UART3 on a RS485 bus.</SPAN><BR /><BR /><SPAN>The RS485 transceiver has power.</SPAN><BR /><SPAN>The transmit enable line is pulled to enable the transceiver.</SPAN><BR /><SPAN>UART3 peripheral has power</SPAN><BR /><SPAN>Pins are initialized</SPAN><BR /><SPAN>Baud rate is set</SPAN><BR /><SPAN>The FIFOs are enabled via FIFO Control Register</SPAN><BR /><SPAN>Transmit is enabled via Transmit Enable Register</SPAN><BR /><BR /><SPAN>When I write a byte to Transmit Holding Register, the Line Status Register indicates that the THR contains data, but it is not sending.</SPAN><BR /><BR /><SPAN>Any ideas on what I'm missing?</SPAN><BR /><BR /><SPAN>Thanks!</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:39:28 GMT https://community.nxp.com/t5/LPC-Microcontrollers/UART3-RS485-Not-Transmitting/m-p/519151#M3010 lpcware 2016-06-15T17:39:28Z