Updated Drivers

drivers/0x01_uart/0x01_uart.c

@@ -46,32 +46,23 @@
 #define UART_RX_PIN  1
 #define UART_BAUD    115200
 
-/**
- * @brief Convert a lowercase ASCII character to uppercase
- *
- * Returns the uppercase equivalent if the character is in 'a'-'z';
- * all other characters are passed through unchanged.
- *
- * @param c Input character
- * @return char Uppercase equivalent, or the original character
- */
-static char to_upper(char c) {
-    if (c >= 'a' && c <= 'z') {
-        return (char)(c - 32);
-    }
-    return c;
-}
 
+/**
+ * @brief Application entry point for the UART uppercase echo demo
+ *
+ * Initializes UART0 and enters an infinite loop that reads incoming
+ * characters, converts them to uppercase, and echoes them back.
+ *
+ * @return int Does not return
+ */
 int main(void) {
     uart_driver_init(UART_TX_PIN, UART_RX_PIN, UART_BAUD);
-
     uart_driver_puts("UART driver ready (115200 8N1)\r\n");
     uart_driver_puts("Type characters to echo them back in UPPERCASE:\r\n");
-
     while (true) {
         if (uart_driver_is_readable()) {
             char c     = uart_driver_getchar();
-            char upper = to_upper(c);
+            char upper = uart_driver_to_upper(c);
             uart_driver_putchar(upper);
         }
     }

drivers/0x01_uart/uart.c

@@ -34,26 +34,39 @@
 
 #define UART_INST uart0
 
+
 void uart_driver_init(uint32_t tx_pin, uint32_t rx_pin, uint32_t baud_rate) {
     uart_init(UART_INST, baud_rate);
     gpio_set_function(tx_pin, GPIO_FUNC_UART);
     gpio_set_function(rx_pin, GPIO_FUNC_UART);
 }
 
+
 bool uart_driver_is_readable(void) {
     return uart_is_readable(UART_INST);
 }
 
+
 char uart_driver_getchar(void) {
     return (char)uart_getc(UART_INST);
 }
 
+
 void uart_driver_putchar(char c) {
     uart_putc_raw(UART_INST, c);
 }
 
+
 void uart_driver_puts(const char *str) {
     while (*str) {
         uart_putc_raw(UART_INST, *str++);
     }
 }
+
+
+char uart_driver_to_upper(char c) {
+    if (c >= 'a' && c <= 'z') {
+        return (char)(c - 32);
+    }
+    return c;
+}

drivers/0x01_uart/uart.h

@@ -86,4 +86,15 @@ void uart_driver_putchar(char c);
  */
 void uart_driver_puts(const char *str);
 
+/**
+ * @brief Convert a lowercase ASCII character to uppercase
+ *
+ * Returns the uppercase equivalent if the character is in 'a'-'z';
+ * all other characters are passed through unchanged.
+ *
+ * @param c Input character
+ * @return char Uppercase equivalent, or the original character
+ */
+char uart_driver_to_upper(char c);
+
 #endif // UART_H