restrcuct

include/io.h

@@ -0,0 +1,64 @@
+#ifndef UART_IO_H
+#define UART_IO_H
+
+#include <stdint.h>
+
+#define UART0_BASE 0x3F201000
+#define UART0_DR   (*((volatile uint32_t *)(UART0_BASE + 0x00)))
+#define UART0_FR   (*((volatile uint32_t *)(UART0_BASE + 0x18)))
+
+typedef struct UART_IO {
+    void (*putc)(char c);
+    void (*puts)(const char* str);
+    char (*getc)(void);
+    void (*print_int)(unsigned int value);
+} UART_IO;
+
+// Function implementations
+
+static void uart_putc(char c)
+{
+    while (UART0_FR & (1 << 5)) { } // Wait while TXFF is set
+    UART0_DR = c;
+}
+
+static void uart_puts(const char* str)
+{
+    while (*str)
+        uart_putc(*str++);
+}
+
+static char uart_getc(void)
+{
+    while (UART0_FR & (1 << 4)) { } // Wait while RXFE is set
+    return (char)(UART0_DR & 0xFF);
+}
+
+static void uart_print_int(unsigned int value)
+{
+    char buffer[10];
+    int i = 0;
+
+    if (value == 0) {
+        uart_putc('0');
+        return;
+    }
+
+    while (value > 0 && i < 10) {
+        buffer[i++] = (value % 10) + '0';
+        value /= 10;
+    }
+
+    while (i--)
+        uart_putc(buffer[i]);
+}
+
+// UART_IO instance with function pointers assigned
+static const UART_IO uart_io = {
+    .putc = uart_putc,
+    .puts = uart_puts,
+    .getc = uart_getc,
+    .print_int = uart_print_int,
+};
+
+#endif // UART_IO_H