LPC Microcontrollers中的主题 ADC overrun https://community.nxp.com/t5/LPC-Microcontrollers/ADC-overrun/m-p/530427#M10001 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by IanB on Thu Dec 17 13:55:28 MST 2015</STRONG><BR /><SPAN>I have an application where the ADC is set to runs continuously. It reads 6 channels, 10 bits per channel, with a division ratio of 56. With a 48MHz clock the sequence repeats 13000 times a second.</SPAN><BR /><SPAN>The interrupt is triggered by the end of the conversion on AD7, and the routine reads all the data registers (not the global data register - I have read the errata)</SPAN><BR /><BR /><SPAN>Although the data seem correct, every channel has bit 30 set indicating an overrun.</SPAN><BR /><BR /><SPAN>I even reduced the interrupt service routine so that it did no more than read the data registers and toggle a GPIO port.</SPAN><BR /><SPAN>I could see on the 'scope that it was running 13000 times a second, but it still indicated overruns on each channel.</SPAN><BR /><BR /><SPAN>Should I just ignore bit 30? Or has there really been an overrun?</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:29:34 GMT lpcware 2016-06-15T19:29:34Z ADC overrun https://community.nxp.com/t5/LPC-Microcontrollers/ADC-overrun/m-p/530427#M10001 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by IanB on Thu Dec 17 13:55:28 MST 2015</STRONG><BR /><SPAN>I have an application where the ADC is set to runs continuously. It reads 6 channels, 10 bits per channel, with a division ratio of 56. With a 48MHz clock the sequence repeats 13000 times a second.</SPAN><BR /><SPAN>The interrupt is triggered by the end of the conversion on AD7, and the routine reads all the data registers (not the global data register - I have read the errata)</SPAN><BR /><BR /><SPAN>Although the data seem correct, every channel has bit 30 set indicating an overrun.</SPAN><BR /><BR /><SPAN>I even reduced the interrupt service routine so that it did no more than read the data registers and toggle a GPIO port.</SPAN><BR /><SPAN>I could see on the 'scope that it was running 13000 times a second, but it still indicated overruns on each channel.</SPAN><BR /><BR /><SPAN>Should I just ignore bit 30? Or has there really been an overrun?</SPAN></BODY></HTML> Wed, 15 Jun 2016 19:29:34 GMT https://community.nxp.com/t5/LPC-Microcontrollers/ADC-overrun/m-p/530427#M10001 lpcware 2016-06-15T19:29:34Z