TM4C1294NCPDT: How to output complex log via UART driver

Guo Yinxiu

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL

Hi,

CCS examples output logs via XDC tools(System_printf). I want to output logs via UART driver(UART_write).

Do you have some examples, especially printing with one or two parameters(e.g. printf("Config failed for deviceMap %u with error code %d\n\n", deviceMap, retVal);)

over 2 years ago

0 Charles Tsai over 2 years ago

TI__Guru**** 191346 points

Hi,

Please download TivaWare SDK from https://www.ti.com/tool/SW-TM4C. The TivaWare SDK provides a suite of software libraries. The libraries include a Driver library for all device peripherals and many examples. The TivaWare Driver library provides easy-to-use APIs for each peripheral to simplify development. Please look at the hello example from C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\hello. The hello example will send a 'hello world' through UART onto your COM port. There are more examples you can find in the below two directories:

C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl

C:\ti\TivaWare_C_Series-2.2.0.295\examples\peripherals

If you are using TI-RTOS then there are examples to send messages to the COM port through UART. Please find below examples that you can download from TI Resource Explorer from within CCS.

0 Guo Yinxiu over 2 years ago in reply to Charles Tsai

Prodigy 170 points

Yes, I have used the example "uart echo", but in this example, it just output a string without any arguments. So if I want to print some strings with parameters, which interface can I use?

0 Charles Tsai over 2 years ago in reply to Guo Yinxiu

TI__Guru**** 191346 points

Hi,

You would need to use C library function like sprintf() to first send the formatted output to a string and then pass the string to UART. See below link.

https://www.tutorialspoint.com/c_standard_library/c_function_sprintf.htm

0 Guo Yinxiu over 2 years ago in reply to Charles Tsai

Prodigy 170 points

Does TI-RTOS provide these similar interfaces? Where can I find?

0 Charles Tsai over 2 years ago in reply to Guo Yinxiu

TI__Guru**** 191346 points

Hi,

If you are referring to the sprintf function, then it is part of the C runtime library. You need the header #include <stdio.h> . Below is an example you can find online. In you case, you just pass the string as an argument to the UART_write() function.

#include <stdio.h>
#include <math.h>

int main () {
   char str[80];

   sprintf(str, "Value of Pi = %f", M_PI);
   puts(str);
   
   return(0);
}

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TM4C1294NCPDT: How to output complex log via UART driver