C Compiler Warning: #223-D - Implicit Function Declaration (dmx512_usart_init)

This warning indicates that the function 'dmx512_usart_init' was used without being explicitly declared before it was called.

To fix this, add a function declaration for 'dmx512_usart_init' before it is called. Do this by adding the following line at the beginning of your code, before the main() function:

void dmx512_usart_init(void);

This declares the function with the same name and arguments as the one you're calling, and should resolve the warning.