Troubleshooting

Printf() troubleshooting

Try not to use Printf().

If needed, use Printf() in main-while() with sufficient time delay.

• printf() can cause a bottleneck for other processing

Do not use Printf() in a Timer Interrupt IRQ handler function.

• In some cases, using printf() in a Timer Interrupt for debugging your algorithm can freeze the processor

Do not use Printf() just before USARTwrite() for the same variable

• In some cases, using printf() then USARTwrite() of a variable value can send "blank" message .

  • e.g.

  printf("%c",value1); // USART2,

  USARTWrite(usart1, &value1) // other serial

  • This can send '__' blank value to USART1

Zigbee communication troubleshooting

When Connecting Each Zigbee to each MCU on a different Laptop.

VCC/GND check

• VCC and GND pins of Zigbee modules (for different laptops) MUST NOT be connected with the same MCU

• Separate the two Zigbee-MCU vcc/gnd pins

• Try not to use breadboard between Zigbee and MCUs

Unstable power source from Laptop

• Try to use external power adaptor for MCU, instead of laptop

  • Laptop with battery may not give stable 5V that can cause communication error

• Check if Laptop is connected to the power adaptor, not on battery.

For Debugging,

• Use the same Laptop for checking the communication between two zigbee-MCU modules