radio_comm.c

/*!
 * File:
 *  radio_comm.h
 *
 * Description:
 *  This file contains the RADIO communication layer.
 *
 * Silicon Laboratories Confidential
 * Copyright 2012 Silicon Laboratories, Inc.
 */

                /* ======================================= *
                 *              I N C L U D E              *
                 * ======================================= */

#include "..\..\bsp.h"

                /* ======================================= *
                 *          D E F I N I T I O N S          *
                 * ======================================= */

                /* ======================================= *
                 *     G L O B A L   V A R I A B L E S     *
                 * ======================================= */

#if (defined SILABS_RADIO_SI446X) || (defined SILABS_RADIO_SI4455)
BIT ctsWentHigh = 0;
#endif


                /* ======================================= *
                 *      L O C A L   F U N C T I O N S      *
                 * ======================================= */

                /* ======================================= *
                 *     P U B L I C   F U N C T I O N S     *
                 * ======================================= */

#if (defined SILABS_RADIO_SI446X) || (defined SILABS_RADIO_SI4455)

/*!
 * Gets a command response from the radio chip
 *
 * @param byteCount     Number of bytes to get from the radio chip
 * @param pData         Pointer to where to put the data
 *
 * @return CTS value
 */
U8 radio_comm_GetResp(U8 byteCount, U8* pData)
{
  SEGMENT_VARIABLE(ctsVal = 0u, U8, SEG_DATA);
  SEGMENT_VARIABLE(errCnt = RADIO_CTS_TIMEOUT, U16, SEG_DATA);

  while (errCnt != 0)      //wait until radio IC is ready with the data
  {
    radio_hal_ClearNsel();
    radio_hal_SpiWriteByte(0x44);    //read CMD buffer
    ctsVal = radio_hal_SpiReadByte();
    if (ctsVal == 0xFF)
    {
      if (byteCount)
      {
        radio_hal_SpiReadData(byteCount, pData);
      }
      radio_hal_SetNsel();
      break;
    }
    radio_hal_SetNsel();
    errCnt--;
  }

  if (errCnt == 0)
  {
    while(1)
    {
      /* ERROR!!!!  CTS should never take this long. */
      #ifdef RADIO_COMM_ERROR_CALLBACK
        RADIO_COMM_ERROR_CALLBACK();
      #endif
    }
  }

  if (ctsVal == 0xFF)
  {
    ctsWentHigh = 1;
  }

  return ctsVal;
}

/*!
 * Sends a command to the radio chip
 *
 * @param byteCount     Number of bytes in the command to send to the radio device
 * @param pData         Pointer to the command to send.
 */
void radio_comm_SendCmd(U8 byteCount, U8* pData)
{
    while (!ctsWentHigh)
    {
        radio_comm_PollCTS();
    }
    radio_hal_ClearNsel();
    radio_hal_SpiWriteData(byteCount, pData);
    radio_hal_SetNsel();
    ctsWentHigh = 0;
}

/*!
 * Gets a command response from the radio chip
 *
 * @param cmd           Command ID
 * @param pollCts       Set to poll CTS
 * @param byteCount     Number of bytes to get from the radio chip.
 * @param pData         Pointer to where to put the data.
 */
void radio_comm_ReadData(U8 cmd, BIT pollCts, U8 byteCount, U8* pData)
{
    if(pollCts)
    {
        while(!ctsWentHigh)
        {
            radio_comm_PollCTS();
        }
    }
    radio_hal_ClearNsel();
    radio_hal_SpiWriteByte(cmd);
    radio_hal_SpiReadData(byteCount, pData);
    radio_hal_SetNsel();
    ctsWentHigh = 0;
}


/*!
 * Gets a command response from the radio chip
 *
 * @param cmd           Command ID
 * @param pollCts       Set to poll CTS
 * @param byteCount     Number of bytes to get from the radio chip
 * @param pData         Pointer to where to put the data
 */
void radio_comm_WriteData(U8 cmd, BIT pollCts, U8 byteCount, U8* pData)
{
    if(pollCts)
    {
        while(!ctsWentHigh)
        {
            radio_comm_PollCTS();
        }
    }
    radio_hal_ClearNsel();
    radio_hal_SpiWriteByte(cmd);
    radio_hal_SpiWriteData(byteCount, pData);
    radio_hal_SetNsel();
    ctsWentHigh = 0;
}

/*!
 * Waits for CTS to be high
 *
 * @return CTS value
 */
U8 radio_comm_PollCTS(void)
{
#ifdef RADIO_USER_CFG_USE_GPIO1_FOR_CTS
    while(!radio_hal_Gpio1Level())
    {
        /* Wait...*/
    }
    ctsWentHigh = 1;
    return 0xFF;
#else
    return radio_comm_GetResp(0, 0);
#endif
}

/**
 * Clears the CTS state variable.
 */
void radio_comm_ClearCTS()
{
  ctsWentHigh = 0;
}

#elif (defined SILABS_RADIO_SI4012)

/*!
 * Gets a command response from the radio chip
 *
 * @param byteCount     Number of bytes to get from the radio chip
 * @param pData         Pointer to where to put the data
 *
 * @return CTS value
 */
U8 radio_comm_GetResp(U8 byteCount, U8* pData)
{
  SEGMENT_VARIABLE(ctsVal = 0u, U8, SEG_DATA);

  if (qSmbus_SMBusRead(SI4012_SMBUS_ADDRESS, byteCount, pData) != \
                                                          SMBUS_RX_FINISHED) {
    return FALSE;
  }

  if (pData[0] == 0x80) {
    return TRUE;
  }

  return FALSE;
}

/*!
 * Sends a command to the radio chip
 *
 * @param byteCount     Number of bytes in the command to send to the radio device
 * @param pData         Pointer to the command to send.
 */
U8 radio_comm_SendCmd(U8 byteCount, U8* pData)
{
  if (qSmbus_SMBusWrite(SI4012_SMBUS_ADDRESS, byteCount, pData) != \
                                                      SMBUS_TRANSMISSION_OK) {
    return FALSE;
  }

  return TRUE;
}

#endif

/*!
 * Sends a command to the radio chip and gets a response
 *
 * @param cmdByteCount  Number of bytes in the command to send to the radio device
 * @param pCmdData      Pointer to the command data
 * @param respByteCount Number of bytes in the response to fetch
 * @param pRespData     Pointer to where to put the response data
 *
 * @return CTS value
 */
U8 radio_comm_SendCmdGetResp(U8 cmdByteCount, U8* pCmdData, U8 respByteCount, U8* pRespData)
{
    radio_comm_SendCmd(cmdByteCount, pCmdData);
    return radio_comm_GetResp(respByteCount, pRespData);
}