About calvin

calvin · 2023-12-26

Hi,Currently, we are facing an accuracy problem when using the built-in DAC on the STM32F407 (with buffer enabled). As the built-in reference voltage measured 2.0005V, we set the DOR to 0x800, expecting to get 1.25V on the DAC output. However, we act...

calvin · 2017-11-20

Posted on November 21, 2017 at 03:52Hello, I'm the STM32F207 user, as title mentioned, I have a trouble when configure the usb packet size from the default 64 bytes to 256 bytes. The problem is that my usb device may not be able to connect with all ...

calvin · 2016-12-05

Posted on December 06, 2016 at 04:17Dear Community members,I'm developing a device which is based on a 'Master - Slave' communication architecture, but now I encountered with a data loss while the Slave is receiving. Since the case is occasional, I ...

calvin · 2015-08-18

Posted on August 18, 2015 at 13:41Hi all,I have a problem when I want to start-up my LAN board, the example program I used is STM32F2x7_ETH_LwIP_V1.0.2, after the program is running, the software reset polling flag ((ETH->DMABMR & ETH_DMABMR_SR) wil...

calvin · 2023-12-28

For buffer off, all output results are quite close to the IDEAL, and there is a larger dynamic range even when the DOR setting is within 100LSB to a few LSB, without significant offsets. This suggests that the DAC itself performs quite well. anyway, ...

calvin · 2023-12-28

Hi,For the test, the DAC output was left floating.I also thought that the listed offset specification only applied when the buffer is off; the buffer amplifier should have a different specification.

calvin · 2023-12-27

>> This resulted in the 0x800 being 1.6201V, which should be near 3.271/2 = 1.6335V, yet there was still a 132mV error.>You mean 13.2 mV?Yes, I mean it! My poor calculation ...In my actual case, I set the DAC to 1229, expecting to get 0.75V (VREF=2....

calvin · 2023-12-26

>Not sure I follow the math here. If VREF+ is 2.005V , a 12-bit DAC output of 0x800 should be near 1.0025 V.It's my typo, and there is something that needs clarification. The voltage of VREF+ is measured at 2.5005V, and it comes from an external volt...

calvin · 2017-11-22

Posted on November 23, 2017 at 02:23Hi Ben, I found out the descriptions in the USB specification about this, very appreciate your guidance.Thanks.

User statistics

User Activity

DAC output offset spec with output buffer enabled

Configure USB Bulk IN/OUT packet size 256 bytes

DMA transfer data loss

STM32F207 DMSBMR->SR always TRUE

Re: DAC output offset spec with output buffer enabled

Re: DAC output offset spec with output buffer enabled

Re: DAC output offset spec with output buffer enabled

Re: DAC output offset spec with output buffer enabled

Re: Configure USB Bulk IN/OUT packet size 256 bytes