MQX 4.1 UART RX problem

oscargarciaabad — Tue, 21 Apr 2015 13:06:33 GMT

Hi all,

I'm trying to communicate with a WIFI module from Inventek using UART. This module uses AT commands.

I configure the UART0 channel in 115200 8 N 1 mode. Then I send to the module the command "AT\r\n". Then I can see in the oscilloscope the answer from the module (this answer is more tha 30 bytes long as I can tell by the time duration of that answer).

The problem is I only can read 7 bytes from this response. After thta I try again with the same result (Only read the first seven bytes of the answer).

I tried with different UART channels and both interrupt and polling driver with the same result. I tried too with read and fread functions an the result is still the same. (Find attached my user_config.h file).

The code I'm using is:

#include <mqx.h>

#include <bsp.h>

#include "serial.h"

#include "ioctl.h"

#include "mutex.h"

#define WUART_CHANNEL "ittya:"

#define WUART_BAUDRATE ( 115200uL )

#define WUART_STOP_BITS IO_SERIAL_STOP_BITS_1

#define WUART_DATA_BITS 8

#define WUART_PARITY IO_SERIAL_PARITY_NONE

typedef struct

{

MQX_FILE_PTR ChannelFD; /* UART Channel FD */

uint32_t Baudrate; /* UART Baudrate */

uint32_t Parity; /* UART Parity */

uint32_t StopBits; /* UART Stop Bits */

uint32_t DataBits; /* UART Data Bits */

MUTEX_STRUCT uartMutex;

} WUART_INFO;

extern uint32_t WUART_init( WUART_INFO *uartCtx_Ptr)

{

uint32_t retValue = ENET_OK;

uint8_t Buffer[64];

int32_t BytesRead, Index;

* * * * * * * * * *

* Init Ctx struct

* * * * * * * * * *

uartCtx_Ptr->Baudrate = WUART_BAUDRATE;

uartCtx_Ptr->Parity = WUART_PARITY;

uartCtx_Ptr->StopBits = WUART_STOP_BITS;

uartCtx_Ptr->DataBits = WUART_DATA_BITS;

* * * * * * * * * * * *

* Open the serial port

* * * * * * * * * * * *

uartCtx_Ptr->ChannelFD = fopen( WUART_CHANNEL,

(const char *)( IO_SERIAL_RAW_IO |

IO_SERIAL_NON_BLOCKING) );

if(uartCtx_Ptr->ChannelFD == NULL )

{

retValue = ENETERR_INIT_FAILED;

}

else

{

* * * * * * * * * * *

* Set UART baudrate

* * * * * * * * * * *

if( ioctl( uartCtx_Ptr->ChannelFD,

IO_IOCTL_SERIAL_SET_BAUD,

&uartCtx_Ptr->Baudrate ) != ( uint32_t ) MQX_OK )

{

retValue = ENETERR_INIT_FAILED;

}

if( retValue == ENET_OK )

{

* * * * * * * * * *

* Set UART Parity

* * * * * * * * * *

if( ioctl( uartCtx_Ptr->ChannelFD,

IO_IOCTL_SERIAL_SET_PARITY,

&uartCtx_Ptr->Parity ) != ( uint32_t ) MQX_OK )

{

retValue = ENETERR_INIT_FAILED;

}

if( retValue == ENET_OK )

{

* * * * * * * * * * *

* Set UART Stop Bits

* * * * * * * * * * *

if( ioctl( uartCtx_Ptr->ChannelFD,

IO_IOCTL_SERIAL_SET_STOP_BITS,

&uartCtx_Ptr->StopBits ) != ( uint32_t ) MQX_OK )

{

retValue = ENETERR_INIT_FAILED;

}

if( retValue == ENET_OK )

{

* * * * * * * * * * *

* Set Data Bits

* * * * * * * * * * *

if( ioctl( uartCtx_Ptr->ChannelFD,

IO_IOCTL_SERIAL_SET_DATA_BITS,

&uartCtx_Ptr->DataBits ) != ( uint32_t ) MQX_OK )

{

retValue = ENETERR_INIT_FAILED;

}

memset(Buffer, 0, 20);

write(uartCtx_Ptr->ChannelFD, "AT\r\n", 4);

while(1)

{

BytesRead = fread(Buffer, 1, 1, uartCtx_Ptr->ChannelFD);

if(BytesRead > 0 )

{

printf("%c", Buffer[0]);

fflush( stdout );

}

return( retValue );

}

Original Attachment has been moved to: user_config.h.zip

Re: MQX 4.1 UART RX problem

DavidS — Tue, 21 Apr 2015 16:03:14 GMT

Hi Oscar,

Your user_config.h has following:

#define BSP_DEFAULT_IO_CHANNEL "iodebug:"

This implies to me that you are using the debugger interface for your STDIO (printf)....correct?

I can imagine this is a very slow interface and might not be able to keep up with the ittya interface.

Could you try to store the ittya data to a buffer rather than using the printf to see if system works?

Regards,

David

Re: MQX 4.1 UART RX problem

oscargarciaabad — Wed, 22 Apr 2015 09:38:17 GMT

Hi David,

First of all thank you for your help. I Changed BSP_DEFAULT_IO_CHANNEL to "ittyf:" and used TWR-SER for the console output. The result is still the same. I took a look at the TWR-K60F120M schematics and I noticed that PTA1 and PTA2 are connected to the JTAG header. I'm debugging using JTAG... the problem disappear when I'm not debugging the system!

I'm going to try to debug using Open-SDA.

Thanks a lot,

Oscar.

Re: MQX 4.1 UART RX problem

RadekS — Wed, 22 Apr 2015 12:35:07 GMT

Hi Oscar,

Thank you for your info about root cause.

Have a great day,
RadekS

Re: MQX 4.1 UART RX problem

oscargarciaabad — Wed, 22 Apr 2015 13:03:26 GMT

Hi RadekS,

You are welcome!

Regards,

Oscar.

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