LeafLabs Garden » Topic: Using USART CK pin for different purpose after Serial.begin()

LeafLabs Garden » Topic: Using USART CK pin for different purpose after Serial.begin() http://forums.leaflabs.com/topic.php?id=1147 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:07:58 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://forums.leaflabs.com/search.php HDS on "Using USART CK pin for different purpose after Serial.begin()" http://forums.leaflabs.com/topic.php?id=1147#post-7135 Thu, 10 Nov 2011 13:55:39 +0000 HDS 7135@http://forums.leaflabs.com/ Just GREAT! tx for reply. This makes many things much easier here... (Shield design, connector positions) BTW: tried a serial bitbanging also with other pin(s) Pin 13 Dedicated also to peripheral SPI, 1_SCK. Here I notice strange chars on the LCD about each half second mixing with the transmitted chars... Explanations? 5 min later: EDIT: BOARD_LED_PIN: 13 - I'm using this in the loop to signalize LCD communication... (Ashes to ashes, dust to dust, brickheads to brickheads...) But: Again thanks for your clearifying statement ;)) mbolivar on "Using USART CK pin for different purpose after Serial.begin()" http://forums.leaflabs.com/topic.php?id=1147#post-7072 Wed, 02 Nov 2011 14:38:44 +0000 mbolivar 7072@http://forums.leaflabs.com/ We only touch the TX and RX pins from within Serialx.begin(), so using the other pins as regular INPUT or OUTPUT should just work. HDS on "Using USART CK pin for different purpose after Serial.begin()" http://forums.leaflabs.com/topic.php?id=1147#post-7063 Tue, 01 Nov 2011 13:27:49 +0000 HDS 7063@http://forums.leaflabs.com/ Hi, I am using pin 6 (Maple rev5) for serial communicaion with an LCD 2.5 from Sparkfun, but also Serial1 for the communication with another processor. According to the general pin map, pin 6 is beeing dedicated to Serial1.CK. <pre><code>void setup() { pinMode(pinLCD, OUTPUT); //Pin 6 to LCD, 5 V tolerant pinMode(BOARD_LED_PIN, OUTPUT); //Watchdog-LED Serial1.begin(57600); //subproc-Serial Serial2.begin(9600); //Motorcontroller LCD.begin(38400); //Bitbanging-LCDSerial at pin 6 pinMode(9, OUTPUT); //DTR to subproc digitalWrite(9,LOW);//subproc-reset delay(10); digitalWrite(9,HIGH); delay(2000); //LCD.ClearDisplay(); delay(10); //LCD.print( s_plashA ); delay(10); //LCD.print( s_plashB ); delay(2000); SerialUSB.println(s_plashA); SerialUSB.println(s_plashB); }</code></pre> At the pin 6, which drives the LCD via SoftwareSerial (bitbanging) I never had any clock signal from the USART1, which definitely would have printed something strange on the LCD. In the loop, there is - by the time now - never at the same time communication with the Serial1 and the LCD. My question(s) is(are) now: A) Do I bring the chip into danger by using the CK-pin of an activated USART for different purpose - (which indeed works seemingless right now), or B) is this pin never used by the USART due to its parameters (synchronous/asynchronous??) after Serial.begin(Baudrate)? C) And what about the other USART pins except (TXn, RXn), could they be reused the same way, when initialized as Input / Output pins before the Serial[n].begin()? So- these are questions primarily posed to the folks from leaflabs... Would be pleased if there might be a short answer... (Forgibe any misspellings - am no native english speaker) ;-)