About CLH

CLH · 2021-07-13

Hi,I have a STMF32446ZE board and require an external crystal that isn't using the STLINK crystal. For x3 ST recommend the following: NX3225GD-8.000MEXS00A-CG04874The specs of this crystal are: Frequency Stability ±50ppm Frequency Tolerance ±20ppm ...

CLH · 2020-03-03

Given the following possibilities:Buffer not filled due to message not being in correct formatBuffer not filled due to random characters sent on the TX lineHow do I go about resetting/aborting the transfer if the message isn't fully filling the buffe...

CLH · 2020-02-18

I have the following code:HAL_UART_Transmit_DMA(Outgoinghuart, (uint8_t *)message, sizeOfMessage); delay(10000); HAL_UART_Transmit_DMA(Outgoinghuart, (uint8_t *)message, sizeOfMessage);The second DMA transmit is always busy, no matter how big the del...

CLH · 2020-02-05

The scope is showing the following code takes 602ms (I'm using the external crystal, so no jitter) this 2ms can be seen on top of any delay I set. while (1) { HAL_GPIO_WritePin(GPIOB, profilingPin_Pin, GPIO_PIN_SET); HAL_Delay(300); H...

CLH · 2020-01-08

Hi, This may be an easy thing to answer, but I haven't had much experience. I have a JSON message that I'm sending down to my F446RE board.I am using the HAL_UART_RxCpltCallback function, this works great, however, for this to work I need to know the...

CLH · 2020-03-03

It isn't a hardware issue as much as it is guaranteeing the USART can recover without question if random things happen on the line.Are you of the opinion that it can't happen if the hardware is setup correctly, and will work 100% of the time? I have ...

CLH · 2020-02-21

After an entire week wasted thinking it was a code issue. It was attolic studio. Breakpoints to be specific. To fix the issue:1) Clear all breakpoints2) Power cycle board3) Re-flash the boardnow everything works... This IDE finds new ways to annoy th...

CLH · 2020-01-08

Is it possible to get byte-by-byte interrupts without using DMA. My issue is that if I set the following: HAL_UART_Receive_IT(&huart3, buffer_rx, 1); Then once the buffer is full aka 1 byte then the interrupt is fired, however isn't fired again. The ...

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Can't find the X3 crystal recommended by ST from any supplier, nor can I find an equivalent that is in stock from any supplier.

Buffer never filled due to incorrect message/noise, how to reset if buffer not filled in time?

HAL_UART_Transmit_DMA() cannot send 2 as second shows busy

HAL_Delay is offset by 2ms on the scope

Get single JSON message sent over Serial.

Re: Buffer never filled due to incorrect message/noise, how to reset if buffer not filled in time?

Re: HAL_UART_Transmit_DMA() cannot send 2 as second shows busy

Re: Get single JSON message sent over Serial.