I have a Leonardo where:
I'm trying to get print and println to work with no success. I've written a little piece of C code to poll /dev/ttyUSB0 and /dev/ttyAMA0 for data. Nothing.
I tried using the IDE's "Serial Monitor" listening on serial ports /dev/ttyUSB0 and /dev/ttyAMA0. Nothing.
Suggestions?
Suggestions?
Start by posting the test program running on the Leonardo
#include <HID.h>
#include <Keyboard.h>
#include "usb_hid_keys.h"
#if 0
/* Arduino Zero */
#define SERDEBUG Serial1
#define USBEvent Serial
#endif
#if 1
/* Trinket M0 or 32u4 */
//#define SERDEBUG Serial
#define USBEvent Serial1
#endif
#define SHIFT 0x80
const uint8_t _asciimap[128] =
{
0x00, // NUL
0x00, // SOH
0x00, // STX
0x00, // ETX
0x00, // EOT
0x00, // ENQ
0x00, // ACK
0x00, // BEL
0x2a, // BS Backspace
0x2b, // TAB Tab
0x28, // LF Enter
0x00, // VT
0x00, // FF
0x00, // CR
0x00, // SO
0x00, // SI
0x00, // DEL
0x00, // DC1
0x00, // DC2
0x00, // DC3
0x00, // DC4
0x00, // NAK
0x00, // SYN
0x00, // ETB
0x00, // CAN
0x00, // EM
0x00, // SUB
0x00, // ESC
0x00, // FS
0x00, // GS
0x00, // RS
0x00, // US
0x2c, // ' '
0x1e|SHIFT, // !
0x34|SHIFT, // "
0x20|SHIFT, // #
0x21|SHIFT, // $
0x22|SHIFT, // %
0x24|SHIFT, // &
0x34, // '
0x26|SHIFT, // (
0x27|SHIFT, // )
0x25|SHIFT, // *
0x2e|SHIFT, // +
0x36, // ,
0x2d, // -
0x37, // .
0x38, // /
0x27, // 0
0x1e, // 1
0x1f, // 2
0x20, // 3
0x21, // 4
0x22, // 5
0x23, // 6
0x24, // 7
0x25, // 8
0x26, // 9
0x33|SHIFT, // :
0x33, // ;
0x36|SHIFT, // <
0x2e, // =
0x37|SHIFT, // >
0x38|SHIFT, // ?
0x1f|SHIFT, // @
0x04|SHIFT, // A
0x05|SHIFT, // B
0x06|SHIFT, // C
0x07|SHIFT, // D
0x08|SHIFT, // E
0x09|SHIFT, // F
0x0a|SHIFT, // G
0x0b|SHIFT, // H
0x0c|SHIFT, // I
0x0d|SHIFT, // J
0x0e|SHIFT, // K
0x0f|SHIFT, // L
0x10|SHIFT, // M
0x11|SHIFT, // N
0x12|SHIFT, // O
0x13|SHIFT, // P
0x14|SHIFT, // Q
0x15|SHIFT, // R
0x16|SHIFT, // S
0x17|SHIFT, // T
0x18|SHIFT, // U
0x19|SHIFT, // V
0x1a|SHIFT, // W
0x1b|SHIFT, // X
0x1c|SHIFT, // Y
0x1d|SHIFT, // Z
0x2f, // [
0x31, // bslash
0x30, // ]
0x23|SHIFT, // ^
0x2d|SHIFT, // _
0x35, // `
0x04, // a
0x05, // b
0x06, // c
0x07, // d
0x08, // e
0x09, // f
0x0a, // g
0x0b, // h
0x0c, // i
0x0d, // j
0x0e, // k
0x0f, // l
0x10, // m
0x11, // n
0x12, // o
0x13, // p
0x14, // q
0x15, // r
0x16, // s
0x17, // t
0x18, // u
0x19, // v
0x1a, // w
0x1b, // x
0x1c, // y
0x1d, // z
0x2f|SHIFT, // {
0x31|SHIFT, // |
0x30|SHIFT, // }
0x35|SHIFT, // ~
0 // DEL
};
KeyReport rawdata;
char aLine[81];
uint8_t aLine_count = 0;
void setup()
{
Serial1.begin(9600);
#ifdef SERDEBUG
SERDEBUG.begin(9600);
#endif
USBEvent.begin(9600);
aLine_count = 0;
}
void sendReport(KeyReport* keys)
{
HID().SendReport(2,keys,sizeof(KeyReport));
}
void releaseAll()
{
memset(&rawdata, 0x0, sizeof(KeyReport));
sendReport(&rawdata);
}
uint8_t first_time = 1;
void loop() {
memset(&rawdata, 0x0, sizeof(KeyReport));
rawdata.keys[0] = KEY_RIGHT;
sendReport(&rawdata);
releaseAll();
delay(3000);
rawdata.keys[0] = KEY_RIGHT;
sendReport(&rawdata);
releaseAll();
delay(3000);
rawdata.keys[0] = KEY_RIGHT;
sendReport(&rawdata);
releaseAll();
delay(3000);
rawdata.keys[0] = KEY_DOWN;
sendReport(&rawdata);
releaseAll();
delay(1000);
rawdata.keys[0] = KEY_ENTER;
sendReport(&rawdata);
releaseAll();
if (first_time) {
first_time = 0;
memset(&rawdata, 0x0, sizeof(KeyReport));
rawdata.keys[0] = KEY_CAPSLOCK;
sendReport(&rawdata);
releaseAll();
delay(100);
rawdata.keys[0] = KEY_CAPSLOCK;
sendReport(&rawdata);
releaseAll();
delay(100);
rawdata.keys[0] = KEY_LEFTSHIFT;
sendReport(&rawdata);
releaseAll();
delay(100);
}
Serial.print("KEY_A: ");
Serial.print(KEY_A);
uint8_t c;
if (Serial1.available()) // If anything comes in Serial1 (pins 0 & 1)
c = Serial1.read(); // read it and send it out Serial (USB)
memset(&rawdata, 0x0, sizeof(KeyReport));
rawdata.keys[0] = _asciimap[c]; //KEY_A;
sendReport(&rawdata);
releaseAll();
rawdata.keys[0] = KEY_B;
sendReport(&rawdata);
releaseAll();
rawdata.keys[0] = KEY_W;
sendReport(&rawdata);
releaseAll();
rawdata.keys[0] = KEY_ENTER;
sendReport(&rawdata);
releaseAll();
delay(1000);
}When you are having problems, you need to eliminate all unnecessary complexity. That code has a ton of stuff that is completely unrelated to your current project of getting serial communication working.
Use this code:
void setup() {
Serial.begin(9600);
}
void loop() {
Serial.println("hello");
delay(1000);
}
After uploading it, open Serial Monitor. Make sure the baud rate menu at the bottom right corner of Serial Monitor is set to 9600. Does it work as expected?
Created a sketch with this code, built it, uploaded it, and set the port to /dev/ttyUSB0. Opened "Serial Monitor" (baud 9600) and got nothing.
Ran my C polling code on /dev/ttyUSB0; got nothing.
If I plug in the OTG cable and load the simple print sketch code, then I get /dev/ttyACM0 for a serial device I can monitor. And yes, the prints appear.
BUT if I'm running my USB keyboard emulation code then there is NO /dev/ttyACM0 and consequently nothing to monitor.
I tried:
void loop() {
Serial1.println("hello");
delay(1000);
}
And monitoring /dev/ttyUSB0. That's a no-go.
OK, that's a good start. Now try this:
void setup() {
Serial1.begin(9600);
}
void loop() {
Serial1.println("hello");
delay(1000);
}
Make sure to select the port of your CP210x UART Bridge from the Arduino IDE's Tools > Port menu before opening the Serial Monitor.
Looking good guys!
Thanks for all your help!
You're welcome. I'm glad if I was able to be of assistance. Enjoy!
Per