From 0c1f7fef8447da32a94c7b6784edd9a6b3a12428 Mon Sep 17 00:00:00 2001 From: Sadeep Madurange Date: Sun, 3 Nov 2024 14:16:32 +0800 Subject: Serial console. --- door_lock/serial.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 door_lock/serial.c (limited to 'door_lock/serial.c') diff --git a/door_lock/serial.c b/door_lock/serial.c new file mode 100644 index 0000000..4dba0e5 --- /dev/null +++ b/door_lock/serial.c @@ -0,0 +1,32 @@ +#include +#include + +#include "serial.h" + +void serial_init(void) +{ + UBRR0H = UBRRH_VALUE; + UBRR0L = UBRRL_VALUE; +#if USE_2X + UCSR0A |= (1 << U2X0); +#else + UCSR0A &= ~(1 << U2X0); +#endif + UCSR0B = (1 << TXEN0) | (1 << RXEN0); + UCSR0C = (1 << UCSZ01) | (1 << UCSZ00); +} + +static void serial_write_raw(unsigned char data) +{ + while (!(UCSR0A & (1 << UDRE0))) + ; + UDR0 = data; +} + +void serial_write(const char *s) +{ + for (; *s; s++) + serial_write_raw(*s); + serial_write_raw('\r'); + serial_write_raw('\n'); +} -- cgit v1.2.3