I’ve made the USART support for SAM3x8e arduino based board.
The MCU has TXRDY, ENDTX, TXEMPTY, TXBUFE interrupts. What would be the best choice to be used in IRQ driven transmission handling? Now I use TXRDY. Everything works, but I would like to know maybe ENDTX, TXEMPTY are more suitable for such a purpose?
Thanx.