chore: housekeeping

include/uart.h

@@ -3,20 +3,29 @@
 
 #include <stdint.h>
 
+// RS485 baud rate
 #define UART1_BAUD_RATE 9600
+#define UART2_BAUD_RATE 115200
 
-// Macro definitions
-#define APB1_CLOCK (FUNCONF_SYSTEM_CORE_CLOCK / 2)  // APB1 is divided by 2
+// APB1 bus clock is half the system core clock
+#define APB1_CLOCK (FUNCONF_SYSTEM_CORE_CLOCK / 2)
 
-// USART2
-#define UART_BRR_APB1 (((APB1_CLOCK) + (UART_BAUD_RATE / 2)) / (UART_BAUD_RATE))
-
-// USART1
+// Calculate baud rate divisors
+// Adds BAUD_RATE/2 for rounding to nearest integer
+#define UART_BRR_APB1 \
+  (((APB1_CLOCK) + (UART2_BAUD_RATE / 2)) / (UART2_BAUD_RATE))
 #define UART_BRR_APB2 \
   (((FUNCONF_SYSTEM_CORE_CLOCK) + (UART1_BAUD_RATE / 2)) / (UART1_BAUD_RATE))
 
 // Function prototypes
 
-void init_uart(int uart_brr);
+// UART2
+void uart2_init(int uart_brr);
+
+// RS485 functions
+void rs485_init(int uart_brr);
+void rs485_send(uint8_t *buf, uint16_t len);
+uint8_t rs485_available(void);
+uint8_t rs485_read(void);
 
 #endif  // UART_H