Use of created LCD instance in an Interrupt routine - c

Question

I'm working on a project which uses STM32F103C8T6 and HD44780 LCD (2x16) to produce variable frequency PWM. I use the "4ilo HD44780 LCD library" and create an instance of LCD in the main.c called "&lcd".
The problem is when trying to use print something to LCD in the Interrupt routine, I got some errors about undeclaring &lcd because the declaration of LCD is in the main.c file not STM32F1xx_it.h. I tried to place the Interrupt handler in main.c but not a success.
any help would be appreciated
this is STM32F1xx_it.h :
void EXTI0_IRQHandler(void)
{
/* USER CODE BEGIN EXTI0_IRQn 0 */
if(EXTI->PR & EXTI_PR_PR0)
{
EXTI->PR |= EXTI_PR_PR0;
if(GPIOA->IDR & 0x0002) //0000 0000 0000 0010 -> check A1 status
{
power+=IncDec_Power_value;
if (power > maxpowerlimit) power = maxpowerlimit;
}
else
{
power-=IncDec_Power_value;
if (power < minpowerlimit) power = minpowerlimit;
}
}
/* USER CODE END EXTI0_IRQn 0 */
HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
/* USER CODE BEGIN EXTI0_IRQn 1 */
/* USER CODE END EXTI0_IRQn 1 */
}
and main.c
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stm32f1xx.h"
#include "lcd.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define LCDD4Port GPIOB
#define LCDD4Pin GPIO_PIN_12
#define LCDD5Port GPIOB
#define LCDD5Pin GPIO_PIN_13
#define LCDD6Port GPIOB
#define LCDD6Pin GPIO_PIN_14
#define LCDD7Port GPIOB
#define LCDD7Pin GPIO_PIN_15
#define LCDRegisterSelectPort GPIOB
#define LCDRegisterSelectPin GPIO_PIN_5
#define LCDEnablePort GPIOB
#define LCDEnablePin GPIO_PIN_7
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
extern volatile float power;
extern volatile float time;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void Display(Lcd_HandleTypeDef lcd)
{
Lcd_cursor(&lcd, 1, 2);
Lcd_float(&lcd, power, sizeof(power)+1);
Lcd_string(&lcd, " ");
Lcd_cursor(&lcd, 1, 10);
Lcd_float(&lcd, time, sizeof(time)+1);
Lcd_string(&lcd, " ");
}
/* USER CODE END 0 */
/**
* #brief The application entry point.
* #retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
Lcd_PortType ports[] ={LCDD4Port, LCDD5Port, LCDD6Port, LCDD7Port};
Lcd_PinType pins[] = {LCDD4Pin, LCDD5Pin, LCDD6Pin, LCDD7Pin};
Lcd_HandleTypeDef lcd;
lcd = Lcd_create(ports, pins, LCDRegisterSelectPort, LCDRegisterSelectPin, LCDEnablePort,
LCDEnablePin, LCD_4_BIT_MODE);
Lcd_clear_Display(&lcd);
Lcd_cursor(&lcd, 0, 2);
Lcd_string(&lcd, "POWER");
Lcd_cursor(&lcd, 0, 10);
Lcd_string(&lcd, "TIME");
Lcd_cursor(&lcd, 1, 2);
Lcd_float(&lcd, power, sizeof(power)+1);
Lcd_string(&lcd, " ");
Lcd_cursor(&lcd, 1, 10);
Lcd_float(&lcd, time, sizeof(time)+1);
Lcd_string(&lcd, " ");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
Lcd_cursor(&lcd, 1, 2);
Lcd_float(&lcd, power, sizeof(power)+1);
Lcd_string(&lcd, " ");
Lcd_cursor(&lcd, 1, 10);
Lcd_float(&lcd, time, sizeof(time)+1);
Lcd_string(&lcd, " ");
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}