Workshop — Issue with PWM on MSP430F5529 + EduBP-MK2

[rei-vilo]

The following basic sketch sometimes runs and sometimes freezes on the MSP430F5529 LaunchPad and Educational BossterPack-MK2.

// Define variables and constants
#define redLED 39
#define greenLED 38
#define blueLED 37

// Add setup code
void setup()
{
    Serial.begin(9600);
    Serial.println("*** RGB LED");

    pinMode(redLED, OUTPUT);
    pinMode(greenLED, OUTPUT);
    pinMode(blueLED, OUTPUT);
}

// Add loop code
void loop()
{
    for (uint16_t i = 0; i<256; i++) {
        Serial.print("\r Red-Green   ");
        Serial.print(i, DEC);
        analogWrite(redLED, 255-i);
        analogWrite(greenLED, i);
        delay(10);
    }

    for (uint16_t i = 0; i<256; i++) {
        Serial.print("\r Green-Blue  ");
        Serial.print(i, DEC);
        analogWrite(greenLED, 255-i);
        analogWrite(blueLED, i);
        delay(10);
    }

    for (uint16_t i = 0; i<256; i++) {
        Serial.print("\r Blue-Red   ");
        Serial.print(i, DEC);
        analogWrite(blueLED, 255-i);
        analogWrite(redLED, i);
        delay(10);
    }
}

[StefanSch]

Does it freeze directly after loading or also if it is running while.

[rei-vilo]

*** RGB LED is sent to the console, so it freezes after.

Problem is, the issue raises randomly.

[StefanSch]

but only sometimes ?
Can you try the same with a faster baud rate, e.g. 115k?

[StefanSch]

Can you also check this line
#define redLED 39
the device only has 38 pins

[rei-vilo]

Same issue with Serial.begin(115200);, but this time nothing is sent to the console, the issue occurs before sending the first Serial.println("*** RGB LED");.

Pressing the RESET or BSL buttons does nothing, only power-cycling the board.

#define redLED 39 refers to the LaunchPad pin 39, as defined in pins_energia.h line 164

static const uint8_t P1_5 = 38;

[StefanSch]

The link to pins_energia.h goes to the MSP430F5529 but the title says MSP430F2955 ???

[rei-vilo]

Sorry, I was talking about the MSP430F5529.