![]() My thinking was, if I compile the program, and try each morpho pin connector - I may be able to identify which pins are defined and from there decipher this syntax. When you highlight the text "p23" that is defining this pin as the output pin for the variable R which will be our red value, it highlights a box on the right side saying p23 = p1_17.which leads me to absolutely nowhere. I have loaded the app-board RGB program and attempted to compile without modifying at all - which as results in numerous errors.įirstly, pins 23, 24, and 25 - is not clear to which pin of which IC these connections are to be made. I purely want to blink an LED.which is one of the easiest tasks accomplish able on the arduino, yet this platform is much more complicated. I just want to define output pins, plain and simple. I cannot seem to find any syntax references, and the major is that I receive errors on pre written programs that I literally haven't changed anything. I am still having trouble understanding the mbed platform. NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x01 NVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn * PB12 is connected to EXTI_Line12, which has EXTI15_10_IRQn vector */ SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource12) * Tell system that you will use PB12 for EXTI_Line12 */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE) NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE ![]() NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00 NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00 NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn * PD0 is connected to EXTI_Line0, which has EXTI0_IRQn vector */ * Triggers on rising and falling edge */ĮXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOD, EXTI_PinSource0) ĮXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt * Tell system that you will use PD0 for EXTI_Line0 */ GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP GPIO_InitStruct.GPIO_OType = GPIO_OType_PP GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE) RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE) *Ğxternal interrupts Tilen Keil uVision 5 Code below should be well documented to understand how it works. In this example, we will set pin PD0 and PB12 to be a GPIO interrupts. Yes, lines 5-9 have the same interrupt handler and this is also for lines 10 to 15.Īfter you set settings for EXTI, you have to add them into NVIC. You have probably also figured, that only lines 0 to 4 have own IRQ handler. This table show you which IRQ you have to set for NVIC (first column) and function names to handle your interrupts (second column). Handler for pins connected to line 10 to 15 Handler for pins connected to line 5 to 9 STM32F4 has 7 interrupt handlers for GPIO pins. But you have to handle interrupt somehow. OK, now you have selected your pin you want to use. PA0 and PA5 are connected to different lines, they can be used at the same time.Įach line can trigger an interrupt on rising, falling or rising_falling enge on signal.PA0 and PB0 and PC0 and so on, are connected to Line0, so you can use only one pin at one time to handle interrupt from there.IMPORTANT: You can not use two pins on one line simultaneously: This is for all pins on board, All Px0 (where x is GPIO name) pins are connected to Line0 and let’s say all Px3 are connected to Line3 on the Interrupt channel.Īll pins with same number are connected to line with same number. You have to know that PB0 is also connected to Line0 and PC0 also and so on. This means, PA0 is connected to Line0 and PA13 is connected to Line13. They are line0 to line15 and they also represent pin number. In section one (GPIOs) we have 16 interrupt lines. I will show now how to configure GPIO pin to be an interrupt and how to handle it in your code with CMSIS function. October 1, 2014: Added external interrupts library. First interrupt section is for external pins (P0 to P15) on each port, and other section is for other events, like RTC interrupt, Ethernet interrupt, USB interrupt and so on. Each STM32F4 device has 23 external interrupt or event sources.
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