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- Re: Kwikstik UART
Kwikstik UART
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I'm just getting started with my K40 Kwikstik in CW10.1, and do not have a tower system. I've tried running several of the demos, and have been successful at building the MQX libraries to get the demos to debug and execute, however when I probe the UART5 TPs (which I believe are ttyf in software), I see no communication. I have also tried switching the BSP_DEFAULT_IO_CHANNEL to "ttye:", which should be UART4 (the CAN TPs on the Kwikstik), and have probed these with a scope as well with no success. What am I missing? The demo I'm currently trying is the "io_kwikstikk40x256", and it builds successfully after enabling ttya and ttyb.
I also debugged to see that Hardware flow control is not being used, however I also can't figure out where this is set in the software.
Any help would be appreciated!
Thanks,
Neil
Solved! Go to Solution.
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And the solution:
On the KwikStik-K40 V5 board, the silk screen labels for UART5 TX and RTS are REVERSED! As soon as I moved my probe over to the RTS pin, I saw the serial data screaming across as it should.
From continuity checking my KwikStik V5:
TP labeled as "RTS" is connected to pin A44 of the tower connector "PTE8/UART_TX".
TP labeled as "TX" is connected to pin B21 of the tower connector "PTE7/UART_RTS".
TP labeled as "RX" is correctly connected to pin A43 of the tower connector "PTE9/UART_RX".
TP labeled as "CTS" is correctly connected to pin A9 of the tower connector "PTE10/UART_CTS".
I assumed by V5 of a board, Freescale would have the basics checked out, and that a non-functioning port would be my own software mistake. I am still assuming this was my issue with UART4 as well... Maybe I'm wrong?
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Some more information:
I have verified that the output pins still work by using the LWGPIO, and simply toggling the bits.
Additionally, to eliminate flow control as an issue (since I'm not connected to a serial level shifter or other device), I set:
#define BSP_DEFAULT_IO_OPEN_MODE (pointer) (IO_SERIAL_RAW_IO)
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And the solution:
On the KwikStik-K40 V5 board, the silk screen labels for UART5 TX and RTS are REVERSED! As soon as I moved my probe over to the RTS pin, I saw the serial data screaming across as it should.
From continuity checking my KwikStik V5:
TP labeled as "RTS" is connected to pin A44 of the tower connector "PTE8/UART_TX".
TP labeled as "TX" is connected to pin B21 of the tower connector "PTE7/UART_RTS".
TP labeled as "RX" is correctly connected to pin A43 of the tower connector "PTE9/UART_RX".
TP labeled as "CTS" is correctly connected to pin A9 of the tower connector "PTE10/UART_CTS".
I assumed by V5 of a board, Freescale would have the basics checked out, and that a non-functioning port would be my own software mistake. I am still assuming this was my issue with UART4 as well... Maybe I'm wrong?
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Hi Neil ,
So you were successful at everything?
I downloaded the demo code, MQX, added MQX patches, updated CW10.1, and build the code.....did everything per the demo lab document (0.4).
I got close but no cigar as they say.
Something appears not to be built right? Definitely, problems arise when I do the final "Run Debug Configurations",.... Did you do anything special? I'm building on WInXP.
Thanks for any info.
-Kevin 314-546-9624
