Software interrupt doesn't work - please help

[igal]

Posted on September 09, 2013 at 17:04

Hi,

I try to set a software interrupt. I set it as follows: &sharpdefine HZ500_EXT_INT_LINE                                EXTI_Line1 &sharpdefine HZ500_EXT_INT_IRQ                                    EXTI1_IRQn &sharpdefine HZ500_EXT_INT_PREEMPTION                    1 &sharpdefine HZ500_EXT_INT_SUB                                    2 void init_500hz_event_interrupt(void) {   EXTI_InitTypeDef   EXTI_InitStructure;   NVIC_InitTypeDef   NVIC_InitStructure;        /* Enable SYSCFG clock */   RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);     /* Configure EXTI Line1 */   EXTI_InitStructure.EXTI_Line = HZ500_EXT_INT_LINE;   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event;   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;   EXTI_InitStructure.EXTI_LineCmd = ENABLE;   EXTI_Init(&EXTI_InitStructure);        /* Enable and set EXTI1 Interrupt */   NVIC_InitStructure.NVIC_IRQChannel = HZ500_EXT_INT_IRQ;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = HZ500_EXT_INT_PREEMPTION;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = HZ500_EXT_INT_SUB;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;        NVIC_Init(&NVIC_InitStructure); } I have an ISR routine that is triggered by an external interrupt and it should trigger the software interrupt, I use the following command in order to trigger the software interrupt: EXTI_GenerateSWInterrupt(HZ500_EXT_INT_LINE); Unfortunately the software interrupt is not trigered. Am I missing something? The ISR for the interrupt routine is defined as follows: &sharpdefine HZ500_EXT_INT_HANDLER                                                    EXTI1_IRQHandler void HZ500_EXT_INT_HANDLER(void) {     static uint8_t hz_100_creation;          EXTI_ClearITPendingBit(HZ500_EXT_INT_LINE);     TOGGLE_TP23;     read_ppg_led_registers();     hz_100_creation++;     if(hz_100_creation >= HZ_100_COUNT)     {         hz_100_creation = 0; &sharpifdef RAW_DATA_MODE         dls_dicmation(); &sharpelse         dls_100hz_section(); &sharpendif /* RAW_DATA_MODE */     }      } Thank you for your help #exti #event #stm32-exti-software-interrupt" #software-interrupt"

[Tesla DeLorean]

Posted on September 09, 2013 at 22:26

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

[igal]

Posted on September 10, 2013 at 08:29

But since SYSCFG_EXTICR1 = 0; transitions on PA1 will cause interrupt too, I don't want the external port to cause interrupt

[igal]

Posted on September 10, 2013 at 10:17

I found a solution

I cancelled the lines: EXTI_InitStructure.EXTI_Line = HZ500_EXT_INT_LINE; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); instead of using EXTI_GenerateSWInterrupt I use NVIC->STIR = HZ500_EXT_INT_IRQ; Clive's solution works but it also causes external interrupt from the port and not only software interrupts, so it's not good for my purposes. I though setting the type to event will disable external interrupts but will enable software interrupts using EXTI_GenerateSWInterrupt. I was wrong. If anyone has a better way of doing it or if my solution is not a healthy one I will be extremely happy to hear about it Thank you

[oliver23]

Posted on October 16, 2013 at 13:32

Hi

I have had the same problem and found another solution:    EXTI->RTSR = 0x0000;     EXTI->FTSR = 0x0000; This will disable rising and falling edge trigger detection. There will be no trigger from external pin. I recommend updating the library to have this option, doing the above:EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Software_Only; I am open to other suggestions.