LPC Microcontrollers中的主题 i2c_master_transmit_poll soetimes transmits nothing https://community.nxp.com/t5/LPC-Microcontrollers/i2c-master-transmit-poll-soetimes-transmits-nothing/m-p/544045#M12817 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by remcopoelstra on Fri Oct 31 06:48:56 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm using the I2C rom driver on an LPC11A12. Setup runs fine (I get back a handle and no error when I set the bitrate).</SPAN><BR /><SPAN>Sometimes when I then call i2c_master_transmit_poll(), the function returns LPC_OK, but nothing is transmitted. Other times, it works fine, so I assume it must be a timing issue.</SPAN><BR /><SPAN>Unfortunately I've no idea where to start looking.</SPAN><BR /><SPAN>The SCL and SDA lines are high, so the bus is free.</SPAN><BR /><SPAN>The STAT register is 0xF8, so the controller is doing nothing.</SPAN><BR /><SPAN>Under what circumstances can the i2c_master_transmit_poll() return LPC_OK while not transmitting any data?</SPAN><BR /><BR /><SPAN>Thanks in advance.</SPAN><BR /><BR /><SPAN>Kind regards,</SPAN><BR /><BR /><SPAN>Remco Poelstra</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:45:02 GMT lpcware 2016-06-15T19:45:02Z i2c_master_transmit_poll soetimes transmits nothing https://community.nxp.com/t5/LPC-Microcontrollers/i2c-master-transmit-poll-soetimes-transmits-nothing/m-p/544045#M12817 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by remcopoelstra on Fri Oct 31 06:48:56 MST 2014</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I'm using the I2C rom driver on an LPC11A12. Setup runs fine (I get back a handle and no error when I set the bitrate).</SPAN><BR /><SPAN>Sometimes when I then call i2c_master_transmit_poll(), the function returns LPC_OK, but nothing is transmitted. Other times, it works fine, so I assume it must be a timing issue.</SPAN><BR /><SPAN>Unfortunately I've no idea where to start looking.</SPAN><BR /><SPAN>The SCL and SDA lines are high, so the bus is free.</SPAN><BR /><SPAN>The STAT register is 0xF8, so the controller is doing nothing.</SPAN><BR /><SPAN>Under what circumstances can the i2c_master_transmit_poll() return LPC_OK while not transmitting any data?</SPAN><BR /><BR /><SPAN>Thanks in advance.</SPAN><BR /><BR /><SPAN>Kind regards,</SPAN><BR /><BR /><SPAN>Remco Poelstra</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:45:02 GMT https://community.nxp.com/t5/LPC-Microcontrollers/i2c-master-transmit-poll-soetimes-transmits-nothing/m-p/544045#M12817 lpcware 2016-06-15T19:45:02Z