Posted on May 27, 2013 at 05:31Application note AN3070 describes a procedure for releasing RS485 bus when using DMA to transfer USART data. The procedure uses two interrupts: * DMA transfer complete (DMA_TC) interrupt * USART transfer complete ...
Posted on May 13, 2014 at 10:55Scott, did you ever get an answer from STM? I'm connecting the STM to RMII switch (no need for RX_ER signal because of store-and-forward). I'm want the RX_ER pins for a another function, but can't really tell from ...
Posted on April 18, 2014 at 08:53I just ran the numbers for my design and I found the same result, the 25Mhz oscillator I'm using has a really low gain margin (1.62). To this point I've never had issues with the design not starting up. Its seem...
Posted on October 12, 2013 at 20:21I've had this issue also. Dependent on certain settings, the clock used for the timers will actually be 2x the speed of the bus they are on. In section 6.2 of the STM32F4 reference manual there is a short blurb...
Posted on May 31, 2013 at 22:39Thanks for the reply.Concerning latency of DMA transfers. Suppose the DMA did fall behind USART as some point and caused USART TC flag to be set. When using only USART_TC interrupt (my psuedo-code above), the enable...
