Op donderdag 13 september 2018 16:35:22 UTC+2 schreef Jernej Skrabec: > > Dne sreda, 12. september 2018 ob 18:16:45 CEST je [email protected] > <javascript:> > napisal(a): > > I am experiencing issues with Allwinner H3's UART. Trying to use it @ > > 250000 bps, but unable to established reliable communication. It works > fine > > up to 150000 bps, but above this speed no proper communication. I tried > > Armbian with 4.14.65 and 4.13 Linux kernels. > > Currently, with 24 MHz clock parent, 1.5 Mbps is the highest possible rate > (24 > MHz / 16 / x, where x is integer number). Theoretically, it is possible to > change clock parent but I'm not sure anyone actually tried that. Such > change > would also affect I2C IIRC. > > Best regards, > Jernej > > > With baudrate = 24000000 / 16 / x = 250000, then x = 6 (UART_DLH=6, UART_DLL=0) So with the F_24M the requested 250000 is doable. No need to change clock parent.
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