Change Asynchronous Slave ID from software

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Change Asynchronous Slave ID from software

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legnanimassimo
Contributor I

Is it possible to change Asynchronous Slave ID from software?
Let me explain: is it possible to attribute a value (read for example by an external dip switch) to the slave address ID of an asynchronous port?
Thank you

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legnanimassimo
Contributor I

Hello,
I use UART and I confirm that I would like to be able to assign the Slave code from DipSw so that I can exchange slave devices without having to reprogram the 'Slave Id' property.
I noticed a possibility by changing the code of 'ASl1.c' generated by Processor Expert.
If I insert an external variable visible from 'main.c' called, for example, Code_Id in the code ASl1.c and subsequently modifying the method 'ASl1_AsynchroSeSl (component AsynchroSlave)' like so:

**     This component module is generated by Processor Expert. Do not modify it.
/*!
** @file ASl1.c
** @version 01.33
** @brief
**         This component "AsynchroSlave" implements SLAVE part of asynchronous
**         serial master-slave communication.
*/         
/*!
**  @addtogroup ASl1_module ASl1 module documentation
**  @{
*/         


/* MODULE ASl1. */

/* SerFlag bits */
#define OVERRUN_ERR      0x01U         /* Overrun error flag bit   */
#define COMMON_ERR       0x02U         /* Common error of RX       */
#define CHAR_IN_RX       0x04U         /* Char is in RX buffer     */
#define FULL_TX          0x08U         /* Full transmit buffer     */

static volatile byte SerFlag;          /* Flags for serial communication */
                                       /* Bit 0 - Overrun error */
                                       /* Bit 1 - Common error of RX */
                                       /* Bit 2 - Char in RX buffer */
                                       /* Bit 3 - Full TX buffer */
static ASl1_TComData BufferRead;       /* Input char for SCI commmunication */
static bool SelSlave;                  /* Device is selected */
static void AsynchroSeSl(byte *Flg, byte Num); /* Prototype of the function AsynchroSeSl */

extern byte    Code_Id;       // New external variable

.

.

.

.

/*
** ===================================================================
**     Method      :  ASl1_AsynchroSeSl (component AsynchroSlave)
**
**     Description :
**         Compares the received Slave ID with it's own ID and sets the
**         appropriate flags.
**         This method is internal. It is used by Processor Expert only.
** ===================================================================
*/
static void AsynchroSeSl(byte *Flg, byte Num)
{


  if (Num == ASl1_SLAVE_ID) {          /* Is Num parametr equal as address of slave? */ 

   if (Num == Code_Id) {                     // I replace the constant 'ASl1_SLAVE_ID' with my external variable


    *Flg |= ON_SELECT;                 /* Set flag */
    SelSlave = TRUE;                   /* Slave is selected */
  } else {
    if (SelSlave == TRUE) {            /* Is slave selected? */
      *Flg |= ON_UNSELECT;             /* Set flag */
    }
    SelSlave = FALSE;                  /* Slave is not selected */
  }
}

It might work, I haven't tried it yet ...:smileywink:

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972 Views
legnanimassimo
Contributor I

Hi Vicente,
I am using S912ZVCA192 as master which should communicate with a group of slave devices (9s08sh8) to which I would like to be able to assign them an address by dip switch.
Thanks for your interest

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vicentegomez
NXP TechSupport
NXP TechSupport

Hi

Can you please tell me the protocol that you are using, UART, LIN SPI, IIC?

I believe that you want to use other pins (GPIOs) to set the address and then use the protocols to make the communication, is this correct?

Regards

Vicente 

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vicentegomez
NXP TechSupport
NXP TechSupport

Can you please tell us the device that you are using?

regards

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