topic Re: kinteis k10 uart program error in Kinetis Microcontrollers

kinteis k10 uart program error

gnsh2196 — Tue, 24 Sep 2019 05:59:35 GMT

I am working on a custom board with k10mcu mk10dx256. IM trying to implement uart program with it.I have attached the program.I am getting a garbage value on my serial terminal.

heres my program:

#include <__cross_studio_io.h>
#include "MK10DZ10.h"

main(){
char data = 'a';
int i;
unsigned long int SBR_value=0;
char data1,ch;

SBR_value = (int) ( (72*1000000)/ ( 16 * 9600) ) ;
UART2_BDH |= ( ( SBR_value >> 8 ) & 0x1F );
UART2_BDL = ( SBR_value & 0xFF );

while(1)
{

while( !(( UART2_S1 >> 7) & 0x01));
ch|= data;
UART2_D |=ch;
debug_printf("sending\n %s \n %d \n ",data,i#);}

}

i m getting interrupts but my data is not able to captured in receive program.

Re: kinteis k10 uart program error

jingpan — Wed, 25 Sep 2019 03:28:58 GMT

Hi ganesh,

I think this may the baudrate problem. First, please clarify what kind of K10 are you using. You use K10DZ10.h. This is form 100Mhz main clock device. But in your code, you use 72M to calculate SBR. Second, after reset, the chip clock is in FEI mode. FLL output 20.97M clock to system. You should initialize the clock first.

Regards,

Jing

Re: kinteis k10 uart program error

gnsh2196 — Wed, 25 Sep 2019 05:30:23 GMT

// MCG_C1 Reg Config

MCG_C1 &= ( MCG_C1_CLKS(0x00) | MCG_C1_FRDIV(0x00) );
MCG_C1 |= ( MCG_C1_IREFS_MASK | MCG_C1_IRCLKEN_MASK );

// MCG_C2 Reg Config
MCG_C2 = 0x00; // Disable all the functionalities

//SYSTEM_FREQUENCY
// MCG_C4 Reg Config selecting the range to 60 - 72Mhz
MCG_C4 |= (MCG_C4_SCFTRIM_MASK | MCG_C4_DMX32_MASK );
MCG_C4 |= ( 1 << ( MCG_C4_DRST_DRS_SHIFT + 1) ) ;

//---------- SIM Module

SIM_SOPT2 &= ~(SIM_SOPT2_PLLFLLSEL_MASK); // Selecting the FLL
// common for 72Mhz
SIM_CLKDIV1 |= ((SIM_CLKDIV1_OUTDIV4(0x02)) | (SIM_CLKDIV1_OUTDIV3(0x01)) | (SIM_CLKDIV1_OUTDIV2(0x01)) | (SIM_CLKDIV1_OUTDIV1(0x00) ) );

this is my clock configuration

for 72mhz.

this is my output after configuring the clock.

Re: kinteis k10 uart program error

jingpan — Wed, 25 Sep 2019 09:20:52 GMT

Hi,

can you use a oscilloscope to check the baudrate?

Regards,

Jing

Re: kinteis k10 uart program error

gnsh2196 — Wed, 25 Sep 2019 10:56:28 GMT

hi,

thanks for your help i have figured it out. there seems to be change in the baud rate calculation.

current baudrate was set as 19200.

thank you