## rs232

Minimum support for pic rs232 interface.

1. `void rs232_init()`

   Configures rs232 interface in polling mode. Provides 9600 bauds communications at 16Mhz. Source code must be modified for other speeds

2. `void rs232_putchar(char c)`

   Sends character `c` to rs232 interface when this one becomes available.

3. `char rs232_getchar()`

   Waits for a character, and returns it when available. Can indefinitly block.