http://forums.leaflabs.com/topic.php?id=78 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:19:37 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=78#post-439 Thu, 01 Jul 2010 15:58:55 +0000 bnewbold 439@http://forums.leaflabs.com/ <p>We usually use a multimeter to test this sort of thing... I've never tried to use BOOT1 as GPIO and I couldn't get it to read state changes when I just tried. Next step would be to look at the schematic and see how that pin is pulled up/down. </p> <p>There are now "secret labels"; the low level way to access pins by their port and number (in this case trying C9 which is header pin 38 which is the GPIO for BUT) would be:</p> <p><code><br /> void setup() {<br /> pinMode(13,OUTPUT);<br /> gpio_set_mode(GPIOC_BASE, 9, GPIO_MODE_INPUT_FLOATING);<br /> }</p> <p>void loop() {<br /> digitalWrite(13,gpio_read_bit(GPIOC_BASE,9));<br /> }<br /> </code></p> <p>You can find more functions in libmaple/gpio.h and libmaple/gpio.c. These functions are not "fool proof" or documented and you can definitely do naughty things with them... but they can be useful for getting fast read/write access by cutting out the digitalRead/digitalWrite pin mapping lookups and function call overhead. </p> http://forums.leaflabs.com/topic.php?id=78#post-429 Wed, 30 Jun 2010 20:53:32 +0000 leaflabsandy 429@http://forums.leaflabs.com/ <p>I need to read a "reserve pin" like the<br /> PB2 Boot1 tac swich input - to check if it<br /> is sticky or not working.</p> <p>What are the "top secret" labels for these<br /> pins? </p>