how to make a handler

I have learnt how to use registers to setup GPIO pins and to set/read them.

I now want to learn how to use registers to make interrupt. First I am trying to make an interrupt for rising edge of PA0. I think that I have setup the register properly but don’t know how to set the function that gets called when the interrupt fires.

I have some code to set the PA0 as input but will just post my code for setting up the interrupt.
uint32 *EXTI_IMR = (uint32_t *)0x400107ff;
uint32 *EXTI_RTSR = (uint32_t *)0x40010807;
uint32 *AFIO_EXTICR1 = (uint32_t *)0x40010407;

void setup() {
*EXTI_IMR = 0b00000000000000000000000000000001; //setup for pin 0
*EXTI_RTSR = 0b00000000000000000000000000000001; //setup for rising pin 0
*AFIO_EXTICR1 = 0b00000000000000000000000000000000; //setup for Port A
}

Yes I would like to learn how to do it if no one had already created the fuctions for you and you just had a data shett for a new chip and had to start at the beginning

2nd, use the nvic-enableirq function in cmsis to put the isr in the vector table. Nvic-disableirq does the opposite.

Some examples of that can be found here: https://github.com/dannyf00/My-MCU-Libr … /STM32F1xx

Reading the datasheet is the best way to go, in my view.

I look at the code in your link and this is exactly what I am trying to learn.

Now I have a couple of questions

is NVIC_EnableIRQ() a standard function for C?? do I need to include anything to be able to use it??

Where can I find the vector table??

the code used NVIC_EnableIRQ(TIMx_CC_IRQn) to point to void TIM2_IRQHandler(void), I assume TIMx_CC_IRQn is in the vector table and the data sheet somewhere??? Is there somewhere I can read info on the naming of the fuction i.e why it was called TIM2_IRQHandler

I have discovered “stm32f10x.h” from ST which holds everything that I need for the blue pill.

I also understand what the GNU toolchain from Arm Cortex-M does and this is where the NVIC_EnableIRQ() comes from.

I have my code working now and will clean it up and post it for others to see

Thanks for everyone’s help I am slowly getting learning what I need to know

The main loop just turns off the LED every half a second and and interupt turns it on whenever the is a rising or falling edge on PA12. I have an external pull up on the PA12

#include "stm32f10x.h"

void loop() {
GPIOC->BSRR = GPIO_BSRR_BS13; //Set PC13 low
waiting(1500000);
}

An example would be:

//set LEDG
void ledg_set(void) {
IO_SET(LEDG_PORT, LEDG_PIN);
}

//enable global interrupt
ei();