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//values view macros
//integer viewer
#define I(x) do {char wtbuf[640]; sprintf(wtbuf,"\r\n["#x"=%d] ",(x));Serial.print(wtbuf); delay(1);} while(0);
//hex viewer
#define X(x) do {char wtbuf[640]; sprintf(wtbuf,"\r\n["#x"=0x%x] ",(x));Serial.print(wtbuf);delay(1);} while(0);
//float viewer
#define FL(x) do {char wtbuf[640]; Serial.print("\r\n["#x"="); dtostrf((x),10,5,wtbuf); Serial.print(wtbuf);Serial.print("]");delay(1);} while(0);
//buffer viwer
#define B(x) do {char wtbuf[640]; Serial.print("\r\n["#x"="); for(int i=0;i<sizeof(x);i++){ sprintf(wtbuf,"%02X ",(x)[i]);Serial.print(wtbuf);Serial.print("]"); delay(1);} Serial.print(" "); } while(0);
//string viewer
#define S(x) do {Serial.print("\r\n["#x"=""); Serial.print((x));Serial.print(""] ");delay(1);} while(0);
//break point macro BP
#define BP(x) {char wtbuf[1000]; delay(1); sprintf(wtbuf,"\r\n******BreakPoint in %s() @file:...%s ******",FUNCTION,(char *)(FILE)+strlen(FILE)-20); Serial.print(wtbuf); Serial.print("\r\n=>"); sprintf(wtbuf,"%d ",LINE); Serial.print(wtbuf); Serial.print(#x); while(!Serial.available())delay(1); Serial.read();} x

Demo:

void setup() {
pinMode(13, OUTPUT);
Serial.begin(115200);
}

void loop() {
int i=1;
float f=0.1;

I(i) //view i
FL(f) //view f

BP(digitalWrite(13, HIGH);) // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
BP(digitalWrite(13, LOW);) // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}

Note:
//BP(digitalWrite(13, HIGH);) set a breakpoint at here.

when running the program,open comport monitor please,and select baudrate to 115200, and select options to send an end char after click "send" button.

Then in the monitor ,will display,

******BreakPoint in loop() @file:...tch_883305\Blink.ino ******
=>27 digitalWrite(13, HIGH);

This means that code is running at line 27, in function loop() ,and CPU fall into the breakpoint , you can click the "send" button or press Enter to continue:

******BreakPoint in loop() @file:...tch_201339\Blink.ino ******
=>36 digitalWrite(13, LOW);
[i=1]
[f= 0.10000]
******BreakPoint in loop() @file:...tch_201339\Blink.ino ******
=>34 digitalWrite(13, HIGH);
******BreakPoint in loop() @file:...tch_201339\Blink.ino ******
=>36 digitalWrite(13, LOW);
[i=1]
[f= 0.10000]
******BreakPoint in loop() @file:...tch_201339\Blink.ino ******
=>34 digitalWrite(13, HIGH);