I'm trying to figure out how to use W7500/P chip (from wiznet).
For the EXTI function, I did not find a register like EXTI_PR in ST mcu. So I do not know how to determine which pin really raises a interrupt as all pin use the same EXTI.
Could anyone help?
Thanks
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I'm using STM32F4 and I want to generate a pulse. the question is how do I know the pulse is generated by set certain bit of swier in exti or not? is there any way to detect the generated pulse, or any alternative way to indicate that? how should I do to achieve that way with std library?
any code to config exti for soft event mode, and how to detect or indicate generated pulse
The "pulse generator" in the diagram is merely a description of how the event generation hardware works. It is not a user accessible function.
The difference between an interrupt and an event is not clear in ST's manuals, but an interrupt signals the NVIC, and will result in the associated handler code being executed, while an event is used to directly signal a peripheral device.
So here if the configured EXTI edge occurs, and the corresponding event mask bit is set, a pulse is generated signalling some other internal on-chip peripheral.
there any way to detect the generated pulse
Not in the context of that diagram. It is probably irrelevant to whatever it is you are trying to do.
how should I do to achieve that way with std library?
Classic X-Y problem, you have fixated a solution and are asking questions about the solution. You need to ask about the problem. Unfortunately it is entirely unclear what that problem is.
Moreover what "std library"? Are you using the older "standard peripheral library" or the abysmal CubeMX library?
If you want to simply generate an output pulse in response to an edge in an input, then most of the timer peripherals support that with zero software overhead. Search your parts reference manual for "One-pulse mode" in relation to any of the available timer peripherals.
I am using MC3635 Evaluation Board(EV3635B). There is no problem about SPI connection and i can read X,Y,Z movement via SPI. But i can not use interrupt pin as output. I want that let interrupt pin of the accelerometer give me HIGH when there is a tapping or movement and let me turn this interrupt pin LOW via SPI when i read this changing. Because i am trying to wake my microcontroller by this movement. Additionally i am using PIC12LF1822 but it is not a necessary information. Could you help me to configure the registers of the accelerometer?
Best regards.
I have a basys3 board with a 100MHZ oscillator, I was wondering if it would be feasible to get a 200Mhz clock by pulsing the output on the rising and falling edge of the 100Mhz oscillator. I cant seem to find any material online about people attempting this. thanks for any and all help.
I recommend against it, you should use a PLL or MMCM IP modules, which you can configure in Vivado.
I see in STM32F103 series, the GPIO extra interrupt is set to the EXTI. And GPIOx_0 (x=A,B,C...)is set to EXTI0. Take an example, if I want to use PA0 and PB0 as interrupt input,can I set them to EXTI0 at the same time? I mean in the EXTI0_Handler function I read the value of the input register of PA0 and PB0 to judge which one input a electrical level I want to carry different function by using if...else. I use it in STM8 successfully but there seems a little problem in STM32. Can you help me? Thanks.
The answer explains the problem clearly. The picture takes an example that why the four bits will be changed if you set different pins. You can see that the four bit affect by each other status if you config other pins. I ignore this problem before.
If you look into the STM32F103 Reference Manual p. 209, you will see that there is actually a multiplexer that decides if PA0, PB0, ... or PG0 is connected to the EXTI0 signal:
STM32F103 ExtI0 schematic
That means that you cannot connect both PA0 and PB0 to EXTI0. In fact, there are four specific bits in the alternate function input/output register (AFIO) which let you choose which pin is connected to the EXTI0 signal. Here, these bits are located in the control register AFIO_EXTICR1. See the AFIO register map in the same document for further information.
Now I don't know which setup you are using, but as I recall, I had separate functions for different interrupt request routines (for EXTI0, EXTI1 and so on).
I'm using STM32f103 micro controller for a while and today I just confused about clock source and PLL configuration!
I know the clock source is HSI by default when micro starts and startup_stm32f10x_xx.s runs, but I don't know if PLL sets or not!? how can I know whats my micro freq?
thank you
A call to RCC_GetClocksFreq() will tell you the clock frequencies (SYSCLK, HCLK, PCLK1, PCLK2, ADCCLK).
If you are using the CMSIS library for the STM32, it has functions to configure the clock and also functions to tell you at runtime what the clock is.
If you are not, you will have to look to see where the clock source is being set, and if it is the HSE you will need to know what crystal you have. Once you have that info, you can then look at the M, N, and P parameters of the PLL (if used) to calculate your HCLK. You should be able to find all this information in the reference manual for the STM32F103 in the RCC (reset and clock control) section.