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DIIDevHeads IoT Integration Server
Created by Sterling on 9/11/2024 in #firmware-and-baremetal
How to Manually Program an Interrupt Service Routine (ISR) for STM32F4 MCU Without Using Libraries?
Lets go back to the startup code and look inside the table... what is this? 
                ; External Interrupts
                DCD     WWDG_IRQHandler                   ; Window WatchDog interrupt ( wwdg1_it)                                         
                DCD     PVD_AVD_IRQHandler                ; PVD/AVD through EXTI Line detection                        
                DCD     TAMP_STAMP_IRQHandler             ; Tamper and TimeStamps through the EXTI line            
                DCD     RTC_WKUP_IRQHandler               ; RTC Wakeup through the EXTI line                       
                DCD     FLASH_IRQHandler                  ; FLASH                                           
                DCD     RCC_IRQHandler                    ; RCC        
                ; External Interrupts
                DCD     WWDG_IRQHandler                   ; Window WatchDog interrupt ( wwdg1_it)                                         
                DCD     PVD_AVD_IRQHandler                ; PVD/AVD through EXTI Line detection                        
                DCD     TAMP_STAMP_IRQHandler             ; Tamper and TimeStamps through the EXTI line            
                DCD     RTC_WKUP_IRQHandler               ; RTC Wakeup through the EXTI line                       
                DCD     FLASH_IRQHandler                  ; FLASH                                           
                DCD     RCC_IRQHandler                    ; RCC
That's all the symbols for all the interrupt handlers being declared... we are about to have some fun though because what is this.... 
Default_Handler PROC                                      

                EXPORT  WWDG_IRQHandler                   [WEAK]                                       
                EXPORT  PVD_AVD_IRQHandler                [WEAK]                         
                EXPORT  TAMP_STAMP_IRQHandler             [WEAK]   
                EXPORT  RTC_WKUP_IRQHandler               [WEAK]  
Default_Handler PROC                                      

                EXPORT  WWDG_IRQHandler                   [WEAK]                                       
                EXPORT  PVD_AVD_IRQHandler                [WEAK]                         
                EXPORT  TAMP_STAMP_IRQHandler             [WEAK]   
                EXPORT  RTC_WKUP_IRQHandler               [WEAK]
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