tehsquidge/SquidgeOS
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Keyboard Work - setting up PLIC, UART, Interrupts

Browse source
This commit is contained in:
Liam Kerr 2026-02-10 01:21:49 +00:00
parent 4c0a4958a2
commit 50757427be
12 changed files with 295 additions and 68 deletions
Download patch file Download diff file Expand all files Collapse all files

35
src/drivers/uart.c
View file

@ -1,14 +1,42 @@
#include <stdint.h>
#include <stddef.h>
#include <stdarg.h>
#include <syscon/syscon.h>
#include <drivers/uart.h>
#include <lib/string.h>
void uart_init()
{
kprint("UART Drive Init...");
volatile uint8_t *UART_IER = (uint8_t *)(UART_ADDRESS + 1);
*UART_IER = 0x01; // Enable "Received Data Available" interrupt
kputs("OK");
}
void uart_put(size_t base_addr, uint8_t data)
{
*(volatile uint8_t *)base_addr = data;
}
char uart_getc()
{
if (*UART_LSR & 0x01)
{
return (char)(*UART_RBR);
}
return '\0';
}
void uart_handle_interrupt()
{
char c = uart_getc();
if (c != '\0')
{
// Later, this will go into a "Circular Buffer"
kputchar(c);
}
}
int kputchar(int ch)
{
uart_put(UART_ADDRESS, ch);
@ -107,6 +135,11 @@ void kprintf(const char *format, ...)
p++;
switch (*p)
{
case 'c':
{
char c = (char)va_arg(args, int);
kputchar(c);
}
case 's':
{
char *s = va_arg(args, char *);
@ -127,7 +160,7 @@ void kprintf(const char *format, ...)
}
case 'x': // Hex
case 'p': // Pointer
{
{
uint64_t x = va_arg(args, uint64_t);
kprint_hex(x);
break;