About stuart239955

stuart239955 · 2021-10-22

When both UARTS are transmitting & receiving, my ADC conversions (via DMA) sometimes do not complete. If I double clock speed (which I do not want to do in the product), the problem goes away. I cannot see any issues in my code that would cause this....

stuart239955 · 2012-04-17

Posted on April 17, 2012 at 16:16Hi, I've a complicated application with 3 STM32F1xx microcontrollers. Each of the microcontrollers communicate to each other via SPI. DMA is used for SPI communications. The micros (STM32F103) have 2 SPI ports each. ...

stuart239955 · 2012-02-22

Posted on February 22, 2012 at 17:14Dear All, I have two separate STM32F103's communicating to each other by SPI. I've configured one as a master & the other as a slave. I'm using DMA to automate the SPI transfer. I've used the ST Library (3.5.0) e...

stuart239955 · 2011-06-15

Posted on June 15, 2011 at 10:15Hi, Using STM32F103. I want to use the external trigger mode of the ADC to start a regular group of channels (in dual, simultaneous mode) via the TIM4 CC4 Event. The examples that ST provide illustrate using TIM1 CC1...

stuart239955 · 2010-10-26

Posted on October 26, 2010 at 10:52STM32 Flash sector size

stuart239955 · 2021-10-26

Thank you for your answer. I have examined Application note AN2548: 'Using the STM32F0/F1/F3/Gx/Lx Series DMA controller' and am on the same track as you.So, the answer is that the DMA transfer does not get dropped, it just gets delayed (or blocked)....

stuart239955 · 2021-10-25

Hi. Thanks for your reply.I'm using a STM32F103VE micro at HCLK / AHB = 36MHz APB1 = 18MHz APB2 = 36MHzI've got 2 UARTS using DMA one at 187.5kBaud running as fast as possible to a PC (about 17k bytes / second) other at 115.2 kBaud also runnin...

stuart239955 · 2012-04-18

Posted on April 18, 2012 at 13:49 When this sort of thing happens, Check that the interrupt is being set-up properly. To set up an interrupt, you need to enable the interrupt with its priority & pre-emption. Such as: //*****************************...

stuart239955 · 2012-04-18

Posted on April 18, 2012 at 13:25 Thanks Clive, I tried lowering the data rate (from 9MHz SPI to 4.5MHz) & it appeared to stop the problem. Do you know what happens when the DMA bus bandwidth is exceeded? I though that I'd get some sort of exception...

stuart239955 · 2012-03-05

Posted on March 05, 2012 at 13:21 Hi all, Had no responses, so I'm refreshing this issue to keep it in the 'recent list' on the forum. Anyone got any ideas? Thanks.

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Hi. I have been using STM32F1xx for many years. I have a new design that uses two uarts and the ADC peripheral - all using DMA. My question is: is it possible to overload the bus arbiter when there are too many dma transactions going on at the same time?

SPI Communications with DMA

SPI BSY flag

Timer4 trigger for ADC

STM32 Flash sector size

Re: Hi. I have been using STM32F1xx for many years. I have a new design that uses two uarts and the ADC peripheral - all using DMA. My question is: is it possible to overload the bus arbiter when there are too many dma transactions going on at the same time?

Re: Hi. I have been using STM32F1xx for many years. I have a new design that uses two uarts and the ADC peripheral - all using DMA. My question is: is it possible to overload the bus arbiter when there are too many dma transactions going on at the same time?

Re: I2S/SPI Interrupts

Re: SPI Communications with DMA

Re: SPI BSY flag