Hi, Huang Shijie writes: > 于 2013年07月07日 19:51, Lothar Waßmann 写道: > > Hi, > > > > Shawn Guo writes: > >> On Fri, Jul 05, 2013 at 02:12:30PM +0800, Huang Shijie wrote: > >>> There is something wrong with the RTS/CTS pads: > >>> The RTS pad is assigned with the CTS's value; > >>> while the CTS pad is assigned with the RTS's value. > >>> > >> So basically, you are saying that select_input should be set up for CTS > >> rather than RTS. It seems that the people who generated the macro got > >> the wrong input from developer. > >> > > programming 'select_input' only makes sense for inputs, not outputs. > > Since CTS is an output signal, select_input only makes sense for the > > RTS function of the pads. > Hi Lothar: > > In our imx6 Soc, the CTS is used as a input signal, not as a output signal. > > I checked two boards, one is imx6q ARM2 armidillo board, one is > imx6-sabreauto board, > both the boards use the CTS as a input signal. > that's the problem with the DTE/DCE mode. Depending on the DCEDTE bit in the UARTx_UFCR we would need different pad configurations for RTS/CTS because in DCE mode CTS is an output and in DTE mode it's an input. Thus the correct pad config value would need the input_sel on the CTS pad definition for DTE mode and on the RTS pad definition for DCE mode. Maybe something like: #define MX6Q_PAD_EIM_D19__UART1_DCE_CTS_B 0x09c 0x3b0 0x000 0x4 0x0 #define MX6Q_PAD_EIM_D19__UART1_DCE_RTS_B 0x09c 0x3b0 0x91c 0x4 0x0 #define MX6Q_PAD_EIM_D19__UART1_DTE_CTS_B 0x09c 0x3b0 0x91c 0x4 0x0 #define MX6Q_PAD_EIM_D19__UART1_DTE_RTS_B 0x09c 0x3b0 0x000 0x4 0x0 Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@xxxxxxxxxxxxxxxxxxx ___________________________________________________________ -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
