topic K20 with UART in Kinetis Microcontrollers

K20 with UART

lander — Tue, 29 Jan 2013 14:46:33 GMT

I'm pretty new at CW and microcontrollers so I keep running into issues. I'm getting these errors that are preventing me from debugging my project...

Description Resource Path Location Type

ARM_GCC_Support/ewl/EWL_C/src/sys/uart_console_io.c undefined reference to `InitializeUART' TouchLEDs line 200 C/C++ Problem

ARM_GCC_Support/ewl/EWL_C/src/sys/uart_console_io.c undefined reference to `ReadUARTN' TouchLEDs line 93 C/C++ Problem

ARM_GCC_Support/ewl/EWL_C/src/sys/uart_console_io.c undefined reference to `WriteUARTN' TouchLEDs line 151 C/C++ Problem

mingw32-make: *** [TouchLEDs.elf] Error 1 TouchLEDs C/C++ Problem

The problem is that I can't jump to the line, declaration, or file the problem is located. Also, when I search for 'InitializeUART', ... and the 'uart_console_io.c' on my computer, they are no where to be found. I don't know what I'm missing to receive these errors and I don't know what to do to fix them.

Anybody know what is my issue?

Thank you,

Lander

Re: K20 with UART

JimDon — Tue, 29 Jan 2013 14:59:38 GMT

You (or perhaps some other piece of code) are supposed to define these functions, so that things like printf will use your UART code.

This is what I did, and it make printf work:

enum {

kUARTNoError = 0,

kUARTUnknownBaudRate,

kUARTConfigurationError,

kUARTBufferOverflow, /* specified buffer was too small */

kUARTNoData /* no data available from polling */

};

// these are my functions:

uint8_t Serial_rxbyte(int port, uint8_t *data);

uint8_t Serial_txbuf(int port,uint8_t * data, uint16_t len, uint16_t *sent);

// These make printf work...

int WriteUARTN(void* bytes, unsigned long length);

// This gets called with a length of 1.

int ReadUARTN(void* bytes, unsigned long length )

{

while(RX_EMPTY == Serial_rxbyte(0,(uint8_t *) bytes) )

;

WriteUARTN(bytes, 1);

return kUARTNoError;

}

int WriteUARTN(void* bytes, unsigned long length)

{

Serial_txbuf(0,(uint8_t *)bytes, (uint16_t) length, 0);

return kUARTNoError;

}

// Call other code to init UART, this is just to satisfy the linker...

int InitializeUART( int baudrate )

{

return kUARTNoError;

}

Even if you just define them empty, it will solve the build problem for now.

Re: K20 with UART

adriansc — Tue, 29 Jan 2013 19:44:06 GMT

Hi,

Which version of CW warrior are you using? it is the 10.3 Beta version? If you don´t know it, When did you downloaded and install CW?

There are some members who say that this problem has been solved creating the project again as a new project. You could try it! But it is not 100% accurate that this will solve your problem.

Hope this helps.

Re: K20 with UART

lander — Tue, 29 Jan 2013 20:01:14 GMT

I have tried this with no success. I also went to KINETIS_72MHz_SRC and created a new project with the premade .exe that basically recreates the hello_world project so the user can work on it without having to set anything up.

Do I have to make a processor expert component for UART and DMA in order to talk to the console? And do I call any functions from the components (i.e Enable, SendChar...)?

-Lander

Re: K20 with UART

lander — Tue, 29 Jan 2013 20:23:18 GMT

I was able to build the project by initializing the variables with errors to 0. Now, my program is interrupting (this interrupt PE_ISR(Cpu_Interrupt)) at the printf() statement. I'm working on making sure that my device is set up correctly and such, any ideas on why it is interrupting there?

Re: K20 with UART

JimDon — Tue, 29 Jan 2013 20:40:59 GMT

Which variables did you initialize to 0?

InitializeUART is a function. If you set it to 0 you would crash.

BTW You will not see these errors until you call printf in 10.3 release version.

Re: K20 with UART

lander — Tue, 29 Jan 2013 21:00:21 GMT

I read the response wrong. Okay, I left the functions empty and I'm getting multiple definition errors. I can't seem to understand what is wrong.

Thank you for your help.

Re: K20 with UART

JimDon — Tue, 29 Jan 2013 21:07:34 GMT

It' hard to help if you don't post the errors....

Re: K20 with UART

Frost — Sun, 14 Apr 2013 09:59:53 GMT

So errm... This any help?

Having the same probs.

Re: K20 with UART

Frost — Sun, 14 Apr 2013 10:21:46 GMT

I'm using a KL25 freedom board, but what I'm getting from the above is that you basically need to put in the low level functions if you've left the I/O support at UART(default) when making a new project.

For me, UART0 routes to the SDA debug MCU onboard, so it's a physical UART interface rather than console IO. Might be best to start again with "console IO" selected if you want that for printf...

So basically, I set up the UART to 38400,8,n,1, UART0 on my target, (target's pins PTA1 & PTA2) which connects to the SDA debug MCU's UART1, see the KL25 schematics if you want H/W info. Set up a terminal program in Win7 and opened the com port with matching settings, and hey presto.

Hope that helps. :smileyhappy: