TWR-VF65GS10:UART1 receive pin -not able to read data into buffer

[manjug]

Hi ,

I have connected UART1 RX pin of TWR-VF65GS10 to my App-Board UART TX pin and UART1 TX pin of TWR-VF65GS10 to RX pin to TTL converter board to PC.

I'm able to write data on UART1 TX pin of TWR-VF65GS10.

But I'm not able to read data on UART1 RX pin of TWR-VF65GS10.

Below is the UART1  settings i did and code chunk explaining my read operation.

In vybrid_TWRVF65GS10_a5.h

#ifndef BSPCFG_ENABLE_TTYB

    #define BSPCFG_ENABLE_TTYB              1

#endif

/*

** Interrupt-driven TTY device (UART1)

** MGCT: <option type="bool"/>

*/

#ifndef BSPCFG_ENABLE_ITTYB

    #define BSPCFG_ENABLE_ITTYB             0

#endif

/*

** TTYB and ITTYB baud rate

** MGCT: <option type="number" min="0" max="115200"/>

*/

#ifndef BSPCFG_SCI1_BAUD_RATE

    #define BSPCFG_SCI1_BAUD_RATE             4800

#endif

/*

** TTYB and ITTYB buffer size

** MGCT: <option type="number" min="0" max="256"/>

*/

#ifndef BSPCFG_SCI1_QUEUE_SIZE

    #define BSPCFG_SCI1_QUEUE_SIZE             256

#endif

#if BSPCFG_ENABLE_TTYC

  #define BSP_DEFAULT_IO_CHANNEL                        "ttyb:"

  #define BSP_DEFAULT_IO_CHANNEL_DEFINED

  #else

  #define BSP_DEFAULT_IO_CHANNEL                        NULL

  #endif

#ifndef BSP_DEFAULT_IO_OPEN_MODE

    #define BSP_DEFAULT_IO_OPEN_MODE                      (void *) (/*IO_SERIAL_XON_XOFF |*/ IO_SERIAL_TRANSLATION /*| IO_SERIAL_ECHO*/)

#endif

In my source file :

MQX_FILE_PTR port_dev = NULL;

  char text [256]={0};

  uint32_t len=sizeof(text);

bool disable_rx = FALSE;

   int32_t baud = 4800;

   int32_t result;

   int32_t ser_opts = IO_SERIAL_NON_BLOCKING;

   port_dev = fopen(NMEA_PORT_CHANNEL, BSP_DEFAULT_IO_OPEN_MODE);

   result = ioctl(port_dev, IO_IOCTL_SERIAL_SET_FLAGS, &ser_opts);

   result = ioctl(port_dev, IO_IOCTL_SERIAL_DISABLE_RX, &disable_rx );

   result = ioctl(port_dev, IO_IOCTL_SERIAL_SET_BAUD, &baud);

while(1)

  {

     memset(text, 0,  len);

       result=fread(text,1,18, port_dev);

       text[result+1]='\0';

       printf("String received :%s\n",text);

  }

[naoumgitnik]

Hello Manju,

Have you tried to check if the Tower board software package has a UART driver? - Referred to on the Freescale Tower board description web page.

If not, perhaps timesyssupport might help you with that.

Regards, Naoum Gitnik.

[manjug]

Dear Naoum Gitnik,

My post was with respect to MQX-RTOS.So,please help me in this regard.

[alejandrolozan1]

Hi,

I have not debugged the problem but I recommend you to check the iomux configurations after this function :

_mqx_int _bsp_serial_io_init

(

    /* [IN] Serial device number */

    _mqx_uint dev_num,

    /* [IN] Required functionality */

    _mqx_uint flags

)

{

    switch (dev_num) {

    case 0:

        IOMUXC_RGPIO(32) = 0x001011A2;

        IOMUXC_RGPIO(33) = 0x001011A1;

        break;

    case 1:

        IOMUXC_SCI_FLX1_IPP_IND_SCI_RX_SELECT_INPUT = 0x00000000;

        IOMUXC_SCI_FLX1_IPP_IND_SCI_TX_SELECT_INPUT = 0x00000000;

        IOMUXC_RGPIO(26) = 0x002011A2;

        IOMUXC_RGPIO(27) = 0x002011A1;

        break;

    case 2: // SCI2

        IOMUXC_SCI_FLX2_IPP_IND_SCI_RX_SELECT_INPUT = 0x00000000;

        IOMUXC_SCI_FLX2_IPP_IND_SCI_TX_SELECT_INPUT = 0x00000000;

        IOMUXC_RGPIO(28) = 0x007021A2;

        IOMUXC_RGPIO(29) = 0x007021A1;

    }

    return MQX_OK;

}

Just to make sure the pin configuation does not change in a certain moment due other driver.

Please check that and let us know.

Best Regards,

Alejandro

[manjug]

Hi,

it is hitting

case 1:

        IOMUXC_SCI_FLX1_IPP_IND_SCI_RX_SELECT_INPUT = 0x00000000;

        IOMUXC_SCI_FLX1_IPP_IND_SCI_TX_SELECT_INPUT = 0x00000000;

        IOMUXC_RGPIO(26) = 0x002011A2;

        IOMUXC_RGPIO(27) = 0x002011A1;

        break;

and returns MQX_OK.

[alejandrolozan1]

Hi,

After that please make sure that the register configuration does not change.

Also please check the jumper settings in J24 and J23.

Best Regards,

Alejandro

[manjug]

Hi,

I have attached the document with register values before UART initialized and after initialized.

Jumper settings

J23: 1-2 and 3-4 connected(SCI1_TX to UART1_ELEV_TX and SCI2_TX to OpenSDA_RX)

J24:1-2 and 3-4 connected(SCI1_RX to UART1_ELEV_RX and SCI2_RX to OpenSDA_TX)

Read is not happening still on "ttyb:".UART1 RX pin is continuously fed with strings at 4800 baudrate , Parity:None, Stop bit:1 and No flow control.

below is the code:

#define NMEA_MAX_SIZE 256

#define NMEA_PORT_CHANNEL "ttyb:"

UART_task(){

bool disable_rx = FALSE;

   int32_t baud = 4800;

   int32_t result;

   int32_t ser_opts = IO_SERIAL_NON_BLOCKING;

   int32_t stop_bits=IO_SERIAL_STOP_BITS_1;

   int32_t data_bits=8;

   int32_t parity=IO_SERIAL_PARITY_NONE;

   nmea_port_dev = fopen(NMEA_PORT_CHANNEL,NULL);

   if(nmea_port_dev!=NULL){

   printf("dev pointer value:%d",nmea_port_dev);

   }

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_SET_FLAGS, &ser_opts);

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_DISABLE_RX, &disable_rx );

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_SET_BAUD, &baud);

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_SET_DATA_BITS,&data_bits);

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_SET_STOP_BITS,&stop_bits);

   ioctl(nmea_port_dev, IO_IOCTL_SERIAL_SET_PARITY,&parity);

  while(1)

  {

  memset(NMEA_text, 0,  NMEA_size);

  result=fread(NMEA_text,1,5, nmea_port_dev);//Trying to read length of 5

  if(result>0){

  NMEA_text[result+1]='\0';

  write( nmea_port_dev, NMEA_text, strlen(NMEA_text) );

  fflush(nmea_port_dev);

  ioctl(nmea_port_dev, IO_IOCTL_SERIAL_WAIT_FOR_TC,NULL);

  memset(NMEA_text, 0,  NMEA_size);

  }

  else{

  write( nmea_port_dev, data_buffer, strlen(data_buffer) );

  }

}

}

[alejandrolozan1]

Hi,

I just tested a simple hello world example with a scanf an getchar functions and it works correctly in TWR revG.

I noticed this in your configuration:

#if BSPCFG_ENABLE_TTYC

  #define BSP_DEFAULT_IO_CHANNEL                        "ttyb:"  

You have to make sure that BSPCFG_ENABLE_TTYC is 1 or just change it to BSPCFG_ENABLE_TTYB.

I lack of a H revision.

[manjug]

Dear Alejandro Lozano,

I have already set BSPCFG_ENABLE_TTYC to 1. Now i used ttyc:(SCI2) (#if BSPCFG_ENABLE_TTYB  #define BSP_DEFAULT_IO_CHANNEL "ttyb:")

for opening the device and again reading is not happening.So,i used ttya:(SCI0) which i'm able to read an write with code i posted,Tap points on board for SCI0 are TP12(TX) and TP14(RX).Why ttyc: is not able to open eventhough i didn't set it for default i/o channel,i'm not able to read and write by using standard fread and fwrite?.

[alejandrolozan1]

Hi,

As I see it, the only difference is that I tried with scanf or getchar functions instead of fread.

Can you try with those functions? Also instead of re-opening the channel

  nmea_port_dev = fopen(NMEA_PORT_CHANNEL,NULL);

You can try just to copy the stdout :

nmea_port_dev = stdin;

fread(NMEA_text,1,5, nmea_port_dev);

Please try that and let me know how it goes.

Best Regards,

Alejandro

[karina_valencia]

alejandrolozano do you have an update?

[naoumgitnik]

Alejandro, manjug,

Except for the DDR section (due to its improved layout), there should be no difference between the G and H revision of the Tower module from the Vybrid-software point of view.

Regards, Naoum Gitnik.

[alejandrolozan1]

Sorry for the delay, let me try to reproduce the problem.

Best Regards,

Alejandro

[karina_valencia]

alejandrolozano please continue with the follow up.