Solved
STM32C0- CMSIS- IRQn_Type
Hello everyone,
I'm a newbie working with STM32C031, setting up interrupt for user button (blue button) integrated on the board.
I am using VS Code, GNU_ARM_GCC, and CMSIS. No hal.
while setting up interrupts, interrupt priority, etc. , I am making use of CMSIS functions which use parameter IRQn_Type which defines interrupt numbers and defined interrupt number 4-15 as 7, which I do not understand.
Why 7?
How does shifting a "one" 7 to the left turn on interrupt 13, for example?
/**
\brief Enable Interrupt
\details Enables a device specific interrupt in the NVIC interrupt controller.
\param [in] IRQn Device specific interrupt number.
\note IRQn must not be negative.
*/
__STATIC_INLINE void __NVIC_EnableIRQ(IRQn_Type IRQn)
{
if ((int32_t)(IRQn) >= 0)
{
__COMPILER_BARRIER();
NVIC->ISER[0U] = (uint32_t)(1UL << (((uint32_t)IRQn) & 0x1FUL));
__COMPILER_BARRIER();
}
}
typedef enum
{
/****** Cortex-M0+ Processor Exceptions Numbers ***************************************************************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
HardFault_IRQn = -13, /*!< 3 Cortex-M Hard Fault Interrupt */
SVC_IRQn = -5, /*!< 11 Cortex-M SV Call Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M System Tick Interrupt */
/****** STM32C0xxxx specific Interrupt Numbers ****************************************************************/
WWDG_IRQn = 0, /*!< Window WatchDog Interrupt */
RTC_IRQn = 2, /*!< RTC interrupt through the EXTI line 19 & 21 */
FLASH_IRQn = 3, /*!< FLASH global Interrupt */
RCC_IRQn = 4, /*!< RCC global Interrupt */
EXTI0_1_IRQn = 5, /*!< EXTI 0 and 1 Interrupts */
EXTI2_3_IRQn = 6, /*!< EXTI Line 2 and 3 Interrupts */
EXTI4_15_IRQn = 7, /*!< EXTI Line 4 to 15 Interrupts */
DMA1_Channel1_IRQn = 9, /*!< DMA1 Channel 1 Interrupt */
DMA1_Channel2_3_IRQn = 10, /*!< DMA1 Channel 2 and Channel 3 Interrupts */
DMAMUX1_IRQn = 11, /*!< DMAMUX Interrupts */
ADC1_IRQn = 12, /*!< ADC1 Interrupts */
TIM1_BRK_UP_TRG_COM_IRQn = 13, /*!< TIM1 Break, Update, Trigger and Commutation Interrupts */
TIM1_CC_IRQn = 14, /*!< TIM1 Capture Compare Interrupt */
TIM3_IRQn = 16, /*!< TIM3 global Interrupt */
TIM14_IRQn = 19, /*!< TIM14 global Interrupt */
TIM16_IRQn = 21, /*!< TIM16 global Interrupt */
TIM17_IRQn = 22, /*!< TIM17 global Interrupt */
I2C1_IRQn = 23, /*!< I2C1 Interrupt (combined with EXTI 23) */
SPI1_IRQn = 25, /*!< SPI1 Interrupt */
USART1_IRQn = 27, /*!< USART1 Interrupt */
USART2_IRQn = 28, /*!< USART2 Interrupt */
} IRQn_Type;