Interrupts 🔴 ATmega328P Programming #6 AVR microcontroller with Atmel Studio 

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Use a Queue. There's not much to it. xQueueCreate xQueueSendFromISR xQueueReceive

The short answer is: Stupid proofing the code. Long answer: The desired result for the DDRD register is 0xF0 and not 0xF3 or 0b1111 00xx where x is do not care. Using the bitwise operators allows you to change only the bits you want to change. In this particular case the operations do not change the state of the lower 2 bits of the DDRD register. The base concept is to change only what you need to use. The other concept is to future proof your code. Lets take to following hypothetical: I have some peripheral that take control over the settings of the state of the lower 2 bits of the DDRD register, if I use a = then it will ruin the settings of the peripheral but using a logic operator will not interfere with the operation of the peripheral. The UART is one of the peripherals that takes console of the DDRx settings. & (AND) is used to clear bits. | (OR) is used to set bits. Sample program #include #include int main(void) { uint8_t DDRD = 0; for(uint16_t i = 0; i < 256; i++){ DDRD = (uint8_t)i; DDRD &= 0xF3; //0b11110011 DDRD |= 0xF0; //0b11110000 printf("input 0x%02x | DDRD 0x%02x ",i,DDRD); } return 0; }

@@BinderTronicsI’m finding your video very helpful for a lab I have at Uni. I find it really cool that you take such time to respond to a question. I had the same question since this isn’t obvious for a beginner. Thanks for explaining : )

Skill set hierarchy uart > uart buffers > C/C++ string processing > AT commands > AT command processing > Bluetooth protocol. Recommended HC-06 Bluetooth Module OR Get a ESP32 OR Get a NRF52/NRF53 SoC Depend on what your goal is. Learn the skills or get something that works. The host microcontroller is irrelevant. That should get you going. I'm not going to get to it anytime soon.

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