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KwikStik UART5 baud rate error

Question asked by Leandro Rondon on Jan 19, 2012
Latest reply on Jan 23, 2012 by Leandro Rondon



First of all, I'd like to say that I'm a new computer engineer and just started to learn about ARM development, so I'm sorry if these questions are so basic, but I already read the Reference Manual and search the forum and didn't find how to fix it.


Now, my problem:


I am using a Kinetis KwikStik module with a K40 processor and I'm trying to communicate via UART5 with my PC via COM1. 


I've made a project based on some IAR examples (pdb_adc_demo). My application is a simple echo: the K40 receive a character and send it back.


I want a baudrate of 115200bps, so I made the following calculation (clk is 48000 khz):

sbr = ((clk*1000)/(115200 * 16));

sbr = 26 (1A)


My config registers are like this:


MCG_C1 = 0x18        (FRDIV=3)

MCG_C2 = 0x2C       (EREFS, HGO, RANGE=2)

UART5_BDH = 0x00

UART5_BDL = 0x1A


Then I connected the module and configure the COM1 to use 115200 and it doesn't works. But if I change the COM1 baudrate to 57600 it works like a charm.


Am I doing something wrong? Maybe the MCG configuration is not ok... I don't know :smileysad:



Thank you,

Leandro Rondon