Embedded program hangs because UART transmission

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Alberto Prudhomme
Alberto Prudhomme 2016-10-4
编辑： Alberto Prudhomme 2016-10-4
Hi,
I have a problem with my embedded programming with TivaC launchpad. I have a lot of blocks that include I2C acquisition for an IMU, a UART for GPS and a UART for Xbee.
The last part of the program that I made was the Xbee transmission. Before I made the Xbee block all the program runs perfectly in my launch pad, but when I made the S-function for the serial transmission I found 2 problems.
First: When I begin the program all run fine for 5-6 seconds, but sometimes it can run for 2 minutes without a problem, but in some moment the program hangs.
Second: I have an ADC input from sonar, when I test and graph without the Xbee the signal are totally plain, but when I test with Xbee sending every 3 seconds the signal from the sonar measure with a pic every time the serial was sent.
I think that with this both errors the problem is the memory managing of the launchpad, but I can't find the way to test or solve it.
This is the code of the S-function for the xbee:
/*
* Include Files
*
*/
#if defined(MATLAB_MEX_FILE)
#include "tmwtypes.h"
#include "simstruc_types.h"
#else
#include "rtwtypes.h"
#endif
/* %%%-SFUNWIZ_wrapper_includes_Changes_BEGIN --- EDIT HERE TO _END */
# ifndef MATLAB_MEX_FILE
# include <Energia.h>
# include <math.h>
# endif
/* %%%-SFUNWIZ_wrapper_includes_Changes_END --- EDIT HERE TO _BEGIN */
/*
* Create external references here.
*
*/
/* %%%-SFUNWIZ_wrapper_externs_Changes_BEGIN --- EDIT HERE TO _END */
/* extern double func(double a); */
/* %%%-SFUNWIZ_wrapper_externs_Changes_END --- EDIT HERE TO _BEGIN */
/*
* Output functions
*
*/
extern "C" void Radio_Link_Outputs_wrapper(const real_T *UART_1,
const real_T *xD,
const int_T u_width)
{
/* %%%-SFUNWIZ_wrapper_Outputs_Changes_BEGIN --- EDIT HERE TO _END */
if (xD[0] == 1){
# ifndef MATLAB_MEX_FILE
int as=0;
Serial4.print('$');
for (as=0;as<u_width;as=as+1){
Serial4.print(UART_1[as]);
if (as!=(u_width-1)){
Serial4.print(',');
}
}
Serial4.println('%');
# endif
}
/* %%%-SFUNWIZ_wrapper_Outputs_Changes_END --- EDIT HERE TO _BEGIN */
}
/*
* Updates function
*
*/
extern "C" void Radio_Link_Update_wrapper(const real_T *UART_1,
real_T *xD,
const int_T u_width)
{
/* %%%-SFUNWIZ_wrapper_Update_Changes_BEGIN --- EDIT HERE TO _END */
if (xD[0] != 1){
# ifndef MATLAB_MEX_FILE
Serial4.begin(57600);
# endif
xD[0] = 1;
}
/* %%%-SFUNWIZ_wrapper_Update_Changes_END --- EDIT HERE TO _BEGIN */
}
The simulink diagram of the uart section:
Do you have some idea to solve it?
Thanks

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