http://forums.leaflabs.com/topic.php?id=13433 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:20:46 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=13433#post-28547 Sat, 24 Aug 2013 09:43:25 +0000 stafil 28547@http://forums.leaflabs.com/ <p>thx very much, it's works fine. </p> http://forums.leaflabs.com/topic.php?id=13433#post-28545 Sat, 24 Aug 2013 03:23:18 +0000 ventosus 28545@http://forums.leaflabs.com/ <p>I don't use the ide, but the clock prescalers and multipliers seem to be set in function "setupClocks" in:<br /> maple-ide-v0.0.12/hardware/leaflabs/cores/maple/boards.cpp </p> http://forums.leaflabs.com/topic.php?id=13433#post-28529 Fri, 23 Aug 2013 06:01:37 +0000 stafil 28529@http://forums.leaflabs.com/ <p>thx. I used maple 0.0.12 ide. Where do i change RCC_PRESCALERS? What value is set for 300baud? very thx </p> http://forums.leaflabs.com/topic.php?id=13433#post-28528 Fri, 23 Aug 2013 02:21:53 +0000 ventosus 28528@http://forums.leaflabs.com/ <p>Have a look at RM0008.pdf under the title "fractional baud rate generation", there it's written how the baud rate is configured:</p> <p>Tx/Rx baud rate = fck / (16 * USARTDIV)</p> <p>USARTDIV is a 12.4 fixed point number, it's maximal value therefore is 0xfff.f = 4095.9.</p> <p>In the default configuration of the Maple boards, fck1=72e6 Hz for USART1 and fck2=36e6 Hz for USART2+3.</p> <p>The minimal baud rate therefore is 1098.6 Hz for USART1 and 549.32 Hz for USART2,3.</p> <p>If you want to go lower, you have to lower the clock rates fck1,2 of the MCU.</p> <p>You may achieve this by changing the RCC_PRESCALERS in function "board_setup_clock_prescalers" in "libmaple/wirish/stm32f1/board_setup.cpp". </p> http://forums.leaflabs.com/topic.php?id=13433#post-28527 Fri, 23 Aug 2013 00:16:31 +0000 stafil 28527@http://forums.leaflabs.com/ <p>Hi all,</p> <p>Serial communication with baudrate 300 not working, why? Pls Help me </p>