Add Pullup to uart RX pin

stm-firmware/include/reflow-controller/ui/lcd.h

@@ -39,6 +39,8 @@
 #define LCD_SHIMATTA_STRING "\xBC\xCF\xAF\xC0"
 #define LCD_DEGREE_SYMBOL_STRING "\xDF"
 #define LCD_DEGREE_SYMBOL_CHAR '\xDF'
+#define LCD_OHM_SYMBOL_CHAR '\xF4'
+#define LCD_OHM_SYMBOL_STRING "\xF4"
 
 enum lcd_fsm_ret {LCD_FSM_NOP, LCD_FSM_CALL_AGAIN, LCD_FSM_WAIT_CALL};
 

stm-firmware/main.c

@@ -74,6 +74,9 @@ static inline void uart_gpio_config(void)
 	SHELL_UART_PORT->MODER |= ALTFUNC(SHELL_UART_RX_PIN) | ALTFUNC(SHELL_UART_TX_PIN);
 	SETAF(SHELL_UART_PORT, SHELL_UART_RX_PIN, SHELL_UART_RX_PIN_ALTFUNC);
 	SETAF(SHELL_UART_PORT, SHELL_UART_TX_PIN, SHELL_UART_TX_PIN_ALTFUNC);
+
+	/* Setup Pullup resistor at UART RX */
+	SHELL_UART_PORT->PUPDR |= PULLUP(SHELL_UART_RX_PIN);
 #endif
 }
 

stm-firmware/reflow-menu.c

@@ -71,7 +71,7 @@ static void reflow_menu_monitor(struct lcd_menu *menu, enum menu_entry_func_entr
 	if (systick_ticks_have_passed(my_timestamp, 250)) {
 		my_timestamp = systick_get_global_tick();
 		adc_pt1000_get_current_resistance(&tmp);
-		snprintf(line, sizeof(line), "Res: %.1f", tmp);
+		snprintf(line, sizeof(line), "Res: %.1f " LCD_OHM_SYMBOL_STRING, tmp);
 		menu->update_display(0, line);
 
 		res = temp_converter_convert_resistance_to_temp(tmp, &tmp);