AnsweredAssumed Answered

SendBlock funtion doesn´t send correct data

Question asked by Arturo Arteaga on Mar 21, 2017
Latest reply on Mar 23, 2017 by Alice_Yang





I´m new with freescale microcontrollers and I am testing a board with

MK20DX256VLH7 microcontroller. I have startedwith a Project developed with

the Processor Expert tool. In order to develop the application I have

followed step by step "the Processor Expert Software – Microcontrollers

Driver Suite Getting Started Guide" tutorial. Then when I had to test

debugging I saw that the LED was flashing well with the correct frequency,

but I checked that the message sent to Tera Term Application by UART wasn't

correct. Tera Term has received something but there are some strange

characters. The string that I send is "Hello World". The direction where is

stored the string is 0xfc0 allways, although I change the string, and I saw

that all characters are stored in them.




ange_characters.png> Descripción: Strange characters recrived in Tera Term



The configuration is the same in Tera and in AS1 component, the baud rate is

9600, no parity, stop bit, 8 bits, and no control flow.






aTermConfiguration.png> Descripción: Tera Term Configuration




T_Component_Configuration.png> Descripción: UART Component Configuration


When I execute step by step inside the "AS1_SendBlock" function, I can see

how the characters are saved. For example the character that I can see in

*DeviceDataPrv->OutDataPtr is 0x48h, that is the hexadecimal character of

first letter "H". Then later it is executed the next line:






Here I think it´s the sending order. Why don´t send the string correctly?

There are something in the configuration? The configuration should be

different with MK20DX256VLH7? The baud rate is ok?




In my application “AS1_SendBlock” function  is executed step by step like it

should be, but when I want to see where the data are sent (in which output

registers) when the transmission interrupt is enable, I don’t know where

because they are unknown for me. Do you Know the registers in which appears

the UART output transmission data or the UART output buffer for

mK20dx256vlh7 microcontroller?? I´m reading in the datasheet and I don´t

find any registers related on them. I want to see if the transmission data

in these registers are the same that I want to transmit and also in order to

compare with data that arrive to Tera application.




I would be very grateful for your help,




Arturo Arteaga