digispark:tutorials:debugging
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digispark:tutorials:debugging [2013/05/04 16:08] RC Navy [One Wire Soft Serial Debugging] |
digispark:tutorials:debugging [2016/06/09 12:03] (current) |
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| [[digispark:tutorials:lcd|LCD Shield Kit Tutorial]] | [[digispark:tutorials:lcd|LCD Shield Kit Tutorial]] | ||
| - | ===== One Wire Soft Serial Debugging ===== | + | ===== Bi-directional Serial Debugging with a single I/O ===== |
| - | Since the last version of <SoftSerial> library (may 2013), <SoftSerial> is an alternative for debugging Digispark just using a single I/O. By declaring a <SoftSerial> object with the __same__ pin for Tx and Rx: it's possible to use a half duplex (request/response) software serial port using a __single__ I/O. | + | If you didn't plan to use DigiUSB in your final sketch, the following proposed alternative consumes less pin and program memory than USB.\\ Since the last version of <SoftSerial> library (may 2013), <SoftSerial> is an alternative for debugging Digispark just using a single I/O.\\ By declaring a <SoftSerial> object with the __same__ pin for Tx and Rx: it's possible to use a half duplex (request/response) software serial port using a __single__ I/O. |
| - | The external interface is composed of 2 resistors and a regular diode (See below). | + | The external interface is composed of 2 resistors and a regular diode (See below).\\ This approach allows to use the built-in Serial Monitor of the arduino IDE.\\ Please, note this solution requires a native RS232 port (rare today) or a RS232/USB adapter on the development PC. |
| - | __Usage__: | + | ==== How to use this debugging capabilities? ==== |
| In your sketch, declare a <SoftSerial> object with the same pin for Tx and Rx as depicted below: | In your sketch, declare a <SoftSerial> object with the same pin for Tx and Rx as depicted below: | ||
| - | <code> | + | === Simple example of sketch === |
| - | /* | + | <code c> |
| - | Hardware wiring: | + | |
| - | =============== | + | |
| - | SERIAL ONE WIRE | + | |
| - | DEBUGGING CABLE | + | |
| - | ___________________/\__________________ | + | |
| - | / \ | + | |
| - | ____ | + | |
| - | .--------. | \ | + | |
| - | | GND |--------------------------------+---o5 \ | + | |
| - | | | 47K | | 9o | | + | |
| - | | | .--###--' | o4 | | + | |
| - | | DEBUG | 4.7K | | 8o | | + | |
| - | | TX_RX |-------------------###--+--|<|------o3 | ---> To regular RS232 SubD 9 pins Male of PC or Serial/USB adapter | + | |
| - | | PIN | ^ | 1N4148 | 7o | | + | |
| - | | | | '-----------o2 | | + | |
| - | '--------' | | 6o | | + | |
| - | ATtiny85 Single | o1 / | + | |
| - | (Digispark) I/O |____/ | + | |
| - | SubD 9 pins | + | |
| - | Female | + | |
| - | */ | + | |
| #include <TinyPinChange.h> | #include <TinyPinChange.h> | ||
| #include <SoftSerial.h> | #include <SoftSerial.h> | ||
| Line 104: | Line 83: | ||
| } | } | ||
| } | } | ||
| + | </code> | ||
| + | === Hardware wiring === | ||
| + | <code> | ||
| + | SERIAL SINGLE I/O | ||
| + | DEBUGGING CABLE | ||
| + | ___________________/\__________________ | ||
| + | / \ | ||
| + | ____ | ||
| + | .--------. | \ | ||
| + | | GND |--------------------------------+---o5 \ | ||
| + | | | 47K | | 9o | | ||
| + | | | .--###--' | o4 | | ||
| + | | DEBUG | 4.7K | | 8o | | ||
| + | | TX_RX |-------------------###--+--|<|------o3 | ---> To regular RS232 SubD 9 pins Male of PC | ||
| + | | PIN | ^ | 1N4148 | 7o | or to RS232/USB adapter | ||
| + | | | | '-----------o2 | | ||
| + | '--------' | | 6o | | ||
| + | ATtiny85 Single | o1 / | ||
| + | (Digispark) I/O |____/ | ||
| + | SubD 9 pins | ||
| + | Female | ||
| </code> | </code> | ||
| - | If you didn't plan to use DigiUSB in your sketch, this alternative consumes less pin than USB and less program memory. | + | === Connection between the Digispark and the PC === |
| - | Plug the "Serial One Wire Debugging Cable " to a native RS232 port or a RS232/USB adapter to your development PC. On the PC, open your favorite Terminal application at 38400,n,8,1: HyperTerminal, Teraterm (Windows) or Minicom, GtkTerm (Linux) and CoolTerm for MAC does the trick. | + | Plug the "Serial Single I/O Debugging Cable " to a native RS232 port or to a RS232/USB adapter on your development PC. |
| - | Trick to be less intrusive: use a "high" data rate (38400 is fine): less time wasted in ISR and for transmitting each character. | + | === Built-in IDE Serial Monitor or external Terminal? === |
| + | With this approach, the regular serial monitor of the arduino IDE can be used. In the IDE, just select the RS232 port through the Tools->Serial Port menu. Then, adjust data rate and line terminator (if any), you can use the serial console as usual. | ||
| + | In this case, you do not need any external Terminal.\\ If you prefer using an external Terminal, on the PC, open your favorite Terminal application at 38400,n,8,1: HyperTerminal, Teraterm (Windows) or Minicom, GtkTerm (Linux) and CoolTerm (MAC) does the trick. | ||
| + | |||
| + | __Note__: | ||
| + | * Trick to be less intrusive: use a "high" data rate (38400 is fine) -> less time wasted in ISR and for transmitting each character. | ||
| + | * You can still upload your sketch modifications through the USB interface whilst the additionnal serial port is selected as Serial port in the IDE. | ||
| "Vintage" serial interfaces are not dead! :-) | "Vintage" serial interfaces are not dead! :-) | ||
| + | |||
| + | [[http://p.loussouarn.free.fr/partage/arduino/Libs4Digi_1io_Debug.zip|Download here the related libraries]] | ||
digispark/tutorials/debugging.1367708925.txt.gz · Last modified: 2013/05/04 16:08 by RC Navy
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