LPC MicrocontrollersのトピックLPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542259#M12454 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qwerty1 on Sun Dec 14 02:36:49 MST 2014</STRONG><BR /><SPAN>Hello, </SPAN><BR /><BR /><SPAN>I am trying to configure an interrupt which should occur each 30 ms using the systick. </SPAN><BR /><BR /><SPAN>Do you think it is feasable to count 3&nbsp; 10 ms triggers and then set a flag in order to trigger the can interrupt ? As far as i've understood from the user manual, the 10ms is fixed, the tick clock frequency could be variable ... </SPAN><BR /><BR /><SPAN>RELOAD = (system tick clock frequency x 10 ms) 1 = (50 MHz x 10 ms) -1 = 500000-1 = 499999 = 0x0007A11F.</SPAN><BR /><BR /><SPAN>As i'm not that experienced, any advice counts. </SPAN><BR /><BR /><SPAN>Thanks. </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:46:45 GMT lpcware 2016-06-15T19:46:45Z LPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542259#M12454 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qwerty1 on Sun Dec 14 02:36:49 MST 2014</STRONG><BR /><SPAN>Hello, </SPAN><BR /><BR /><SPAN>I am trying to configure an interrupt which should occur each 30 ms using the systick. </SPAN><BR /><BR /><SPAN>Do you think it is feasable to count 3&nbsp; 10 ms triggers and then set a flag in order to trigger the can interrupt ? As far as i've understood from the user manual, the 10ms is fixed, the tick clock frequency could be variable ... </SPAN><BR /><BR /><SPAN>RELOAD = (system tick clock frequency x 10 ms) 1 = (50 MHz x 10 ms) -1 = 500000-1 = 499999 = 0x0007A11F.</SPAN><BR /><BR /><SPAN>As i'm not that experienced, any advice counts. </SPAN><BR /><BR /><SPAN>Thanks. </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:46:45 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542259#M12454 lpcware 2016-06-15T19:46:45Z Re: LPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542260#M12455 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Sun Dec 14 03:07:26 MST 2014</STRONG><BR /><SPAN>CMSIS or LPCOpen is helping you to setup your SysTick&nbsp; <SPAN class="lia-unicode-emoji" title=":slightly_smiling_face:"><LI-EMOJI id="lia_slightly-smiling-face" title=":slightly_smiling_face:"></LI-EMOJI></SPAN> </SPAN><BR /><BR /><SPAN>Sample:</SPAN><BR /><BR /><TABLE border="1"><TBODY><TR><TD bgcolor="#cacaca"> <PRE>SysTick_Config(SystemCoreClock/10); //set 100ms timer</PRE> </TD></TR></TBODY></TABLE><BR /><BR /><SPAN>Now Systick is reloading 1/10 of a second = 100ms...</SPAN><BR /><BR /><SPAN>Of course you can also set a relad value:</SPAN><BR /><BR /><TABLE border="1"><TBODY><TR><TD bgcolor="#cacaca"> <PRE>SysTick_Config(50E3); //set 1ms timer in 50MHz system</PRE> </TD></TR></TBODY></TABLE><BR /><BR /><SPAN>With 50E6 / 1000 = 50E3 SysTick is triggered every 1/1000 s = 1ms</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:46:46 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542260#M12455 lpcware 2016-06-15T19:46:46Z Re: LPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542261#M12456 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qwerty1 on Sun Dec 14 03:26:07 MST 2014</STRONG><BR /><SPAN>Thank you for your answer, so if i do it like </SPAN><BR /><BR /><SPAN>SysTick_Config(50E3*30) i should get it at 30 ms right ? </SPAN><BR /><BR /><SPAN>Thanks for your help </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:46:47 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542261#M12456 lpcware 2016-06-15T19:46:47Z Re: LPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542262#M12457 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Sun Dec 14 03:32:21 MST 2014</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: qwerty1</STRONG><BR />SysTick_Config(50E3*30) i should get it at 30 ms right ? </SPAN><HR /><BR /><BR /><SPAN>Yes&nbsp; :) </SPAN><BR /><BR /><SPAN>50E3*30 = 1.5E6</SPAN><BR /><BR /><SPAN>That's 1/33 of your main clock and so generating 1/33 sec interrupts...</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:46:48 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542262#M12457 lpcware 2016-06-15T19:46:48Z Re: LPC11c24 30 ms systick interrupt possible ? https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542263#M12458 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by qwerty1 on Sun Dec 14 03:39:30 MST 2014</STRONG><BR /><SPAN>thank you very very much ! </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:46:48 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC11c24-30-ms-systick-interrupt-possible/m-p/542263#M12458 lpcware 2016-06-15T19:46:48Z