805 lines
22 KiB
C
805 lines
22 KiB
C
/******************************************************************************
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* drivers/wireless/spirit/lib/spirit_csma.c
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* Configuration and management of SPIRIT CSMA.
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*
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* Copyright(c) 2015 STMicroelectronics
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* Author: VMA division - AMS
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* Version 3.2.2 08-July-2015
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*
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* Adapted for NuttX by:
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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/******************************************************************************
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* Included Files
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******************************************************************************/
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#include <sys/types.h>
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#include <assert.h>
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#include <debug.h>
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#include "spirit_csma.h"
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#include "spirit_spi.h"
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/******************************************************************************
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* Public Functions
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******************************************************************************/
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/******************************************************************************
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* Name: spirit_csma_initialize
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*
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* Description:
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* Initializes the SPIRIT CSMA according to the specified parameters in the
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* struct spirit_csma_init_s.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* csmainit - Reference to the Csma init structure.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_initialize(FAR struct spirit_library_s *spirit,
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FAR const struct spirit_csma_init_s *csmainit)
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{
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uint8_t regval[5];
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int ret;
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/* Check the parameters */
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DEBUGASSERT(IS_SPIRIT_FUNCTIONAL_STATE(csmainit->csmapersistent));
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DEBUGASSERT(IS_CCA_PERIOD(csmainit->multbit));
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DEBUGASSERT(IS_CSMA_LENGTH(csmainit->ccalen));
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DEBUGASSERT(IS_BU_COUNTER_SEED(csmainit->seed));
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DEBUGASSERT(IS_BU_PRESCALER(csmainit->prescaler));
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DEBUGASSERT(IS_CMAX_NB(csmainit->maxnb));
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/* CSMA BU counter seed (MSB) config */
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regval[0] = (uint8_t)(csmainit->seed >> 8);
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/* CSMA BU counter seed (LSB) config */
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regval[1] = (uint8_t)csmainit->seed;
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/* CSMA BU prescaler config and CCA period config */
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regval[2] = (csmainit->prescaler << 2) | csmainit->multbit;
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/* CSMA CCA length config and max number of back-off */
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regval[3] = (csmainit->ccalen | csmainit->maxnb);
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/* Reads the PROTOCOL1_BASE register value, to write the SEED_RELOAD and
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* CSMA_PERS_ON fields/
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*/
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ret = spirit_reg_read(spirit, PROTOCOL1_BASE, ®val[4], 1);
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if (ret < 0)
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{
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return ret;
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}
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/* Writes the new value for persistent mode */
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if (csmainit->csmapersistent == S_ENABLE)
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{
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regval[4] |= PROTOCOL1_CSMA_PERS_ON_MASK;
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}
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else
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{
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regval[4] &= ~PROTOCOL1_CSMA_PERS_ON_MASK;
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}
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/* Writes PROTOCOL1_BASE register */
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ret = spirit_reg_write(spirit, PROTOCOL1_BASE, ®val[4], 1);
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if (ret < 0)
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{
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return ret;
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}
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/* Writes CSMA_CONFIGx_BASE registers */
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ret = spirit_reg_write(spirit, CSMA_CONFIG3_BASE, regval, 4);
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return ret;
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}
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/******************************************************************************
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* Name: spirit_csma_getinfo
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*
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* Description:
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* Returns the fitted structure struct spirit_csma_init_s starting from the
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* registers values.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* csmainit - Csma structure to be fitted.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_getinfo(FAR struct spirit_library_s *spirit,
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FAR struct spirit_csma_init_s *csmainit)
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{
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uint8_t regval[5];
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int ret;
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/* Reads PROTOCOL1_BASE register */
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ret = spirit_reg_read(spirit, PROTOCOL1_BASE, ®val[4], 1);
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if (ret < 0)
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{
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return ret;
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}
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/* Reads CSMA_CONFIGx_BASE registers */
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ret = spirit_reg_read(spirit, CSMA_CONFIG3_BASE, regval, 4);
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if (ret < 0)
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{
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return ret;
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}
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/* Reads the bu counter seed */
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csmainit->seed = (uint16_t)regval[1] | (uint16_t)regval[0] << 8;
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/* Reads the bu prescaler */
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csmainit->prescaler = regval[2] >> 2;
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/* Reads the Cca period */
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csmainit->multbit = (enum spirit_cca_period_e) (regval[2] & 0x03);
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/* Reads the Cca length */
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csmainit->ccalen = (enum spirit_csmalen_e) (regval[3] & 0xf0);
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/* Reads the max number of back off */
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csmainit->maxnb = regval[3] & 0x07;
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/* Reads the persistent mode enable bit */
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csmainit->csmapersistent =
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(enum spirit_functional_state_e)((regval[4] >> 1) & 0x01);
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return OK;
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}
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/******************************************************************************
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* Name: spirit_csma_enable
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*
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* Description:
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* Enables or Disables the CSMA.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* newstate - The state of the CSMA mode. This parameter can be: S_ENABLE
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* or S_DISABLE.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_enable(FAR struct spirit_library_s *spirit,
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enum spirit_functional_state_e newstate)
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{
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uint8_t regval;
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int ret;
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/* Check the parameters */
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DEBUGASSERT(IS_SPIRIT_FUNCTIONAL_STATE(newstate));
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/* Reads the PROTOCOL1 register value */
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ret = spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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if (ret >= 0)
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{
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/* Sets or resets the CSMA enable bit */
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if (newstate == S_ENABLE)
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{
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regval |= PROTOCOL1_CSMA_ON_MASK;
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}
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else
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{
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regval &= ~PROTOCOL1_CSMA_ON_MASK;
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}
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/* Write the new value on the PROTOCOL1 register */
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ret = spirit_reg_write(spirit, PROTOCOL1_BASE, ®val, 1);
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_csma_getstate
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*
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* Description:
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* Gets the CSMA mode. Says if it is enabled or disabled.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* CSMA mode.
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*
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******************************************************************************/
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enum spirit_functional_state_e
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spirit_csma_getstate(FAR struct spirit_library_s *spirit)
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{
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uint8_t regval;
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/* Reads the PROTOCOL1 register value */
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spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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/* Return if set or reset */
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if (regval & PROTOCOL1_CSMA_ON_MASK)
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{
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return S_ENABLE;
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}
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else
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{
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return S_DISABLE;
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}
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}
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/******************************************************************************
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* Name: spirit_csma_set_persistentmode
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*
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* Description:
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* Enables or Disables the persistent CSMA mode.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* newstate - The state of the persistent CSMA mode. This parameter can
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* be: S_ENABLE or S_DISABLE.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_set_persistentmode(FAR struct spirit_library_s *spirit,
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enum spirit_functional_state_e newstate)
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{
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uint8_t regval;
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int ret;
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/* Check the parameters */
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DEBUGASSERT(IS_SPIRIT_FUNCTIONAL_STATE(newstate));
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/* Reads the PROTOCOL1 register value */
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ret = spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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if (ret >= 0)
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{
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/* Enables/disables the CSMA persistent mode */
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if (newstate == S_ENABLE)
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{
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regval |= PROTOCOL1_CSMA_PERS_ON_MASK;
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}
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else
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{
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regval &= ~PROTOCOL1_CSMA_PERS_ON_MASK;
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}
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/* Write the new value on the PROTOCOL1 register */
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ret = spirit_reg_write(spirit, PROTOCOL1_BASE, ®val, 1);
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_csma_get_persistentmode
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*
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* Description:
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* Gets the persistent CSMA mode.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* CSMA persistent mode.
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*
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******************************************************************************/
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enum spirit_functional_state_e
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spirit_csma_get_persistentmode(FAR struct spirit_library_s *spirit)
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{
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uint8_t regval;
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/* Reads the PROTOCOL1 register value */
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spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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/* Return if set or reset */
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if (regval & PROTOCOL1_CSMA_PERS_ON_MASK)
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{
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return S_ENABLE;
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}
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else
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{
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return S_DISABLE;
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}
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}
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/******************************************************************************
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* Name: spirit_csma_set_seedreload
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*
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* Description:
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* Enables or Disables the seed reload mode (if enabled it reloads the back-
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* off generator seed using the value written in the BU_COUNTER_SEED register).
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* newstate - The state of the seed reload mode. This parameter can be:
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* S_ENABLE or S_DISABLE.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_set_seedreload(FAR struct spirit_library_s *spirit,
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enum spirit_functional_state_e newstate)
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{
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uint8_t regval;
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int ret;
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/* Check the parameters */
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DEBUGASSERT(IS_SPIRIT_FUNCTIONAL_STATE(newstate));
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/* Reads the PROTOCOL1 register value */
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ret = spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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if (ret >= 0)
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{
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/* Enables/disables the seed reload mode */
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if (newstate == S_ENABLE)
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{
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regval |= PROTOCOL1_SEED_RELOAD_MASK;
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}
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else
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{
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regval &= ~PROTOCOL1_SEED_RELOAD_MASK;
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}
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/* Write the new value on the PROTOCOL1 register */
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ret = spirit_reg_write(spirit, PROTOCOL1_BASE, ®val, 1);
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_csma_get_seedreload
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*
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* Description:
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* Gets the seed reload state.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* CSMA seed reload mode.
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*
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******************************************************************************/
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enum spirit_functional_state_e
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spirit_csma_get_seedreload(FAR struct spirit_library_s *spirit)
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{
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uint8_t regval;
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/* Reads the PROTOCOL1 register value */
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spirit_reg_read(spirit, PROTOCOL1_BASE, ®val, 1);
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/* Return if set or reset */
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if (regval & PROTOCOL1_SEED_RELOAD_MASK)
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{
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return S_ENABLE;
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}
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else
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{
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return S_DISABLE;
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}
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}
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/******************************************************************************
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* Name: spirit_csma_set_bucounterseed
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*
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* Description:
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* Sets the BU counter seed (BU_COUNTER_SEED register). The CSMA back off
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* time is given by the formula: BO = rand(2^NB)*BU.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* seed - Seed of the random number generator used to apply the BBE
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* algorithm.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_set_bucounterseed(FAR struct spirit_library_s *spirit,
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uint16_t seed)
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{
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uint8_t regval[2];
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/* Check parameters */
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DEBUGASSERT(IS_BU_COUNTER_SEED(seed));
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/* Build value (MSB) */
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regval[0] = (uint8_t) (seed >> 8);
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/* Build value (LSB) */
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regval[1] = (uint8_t) seed;
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/* Writes the CSMA_CONFIG3 registers */
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return spirit_reg_write(spirit, CSMA_CONFIG3_BASE, regval, 2);
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}
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/******************************************************************************
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* Name: spirit_csma_get_bucounterseed
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*
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* Description:
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* Returns the BU counter seed (BU_COUNTER_SEED register).
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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*
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* Returned Value:
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* Seed of the random number generator used to apply the BBE algorithm.
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*
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******************************************************************************/
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uint16_t spirit_csma_get_bucounterseed(FAR struct spirit_library_s *spirit)
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{
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uint8_t regval[2];
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/* Reads the CSMA_CONFIGx registers value */
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spirit_reg_read(spirit, CSMA_CONFIG3_BASE, regval, 2);
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/* Build the counter seed and return it */
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return ((uint16_t) regval[1] + (((uint16_t) regval[0]) << 8));
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}
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/******************************************************************************
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* Name: spirit_csma_set_buprescaler
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*
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* Description:
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* Sets the BU prescaler. The CSMA back off time is given by the formula:
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* BO = rand(2^NB)*BU.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
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* prescaler - Used to program the back-off unit BU.
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*
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* Returned Value:
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* Zero (OK) on success; A negated errno value is returned on any failure.
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*
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******************************************************************************/
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int spirit_csma_set_buprescaler(FAR struct spirit_library_s *spirit,
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uint8_t prescaler)
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{
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uint8_t regval;
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int ret;
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/* Check parameters */
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DEBUGASSERT(IS_BU_PRESCALER(prescaler));
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/* Reads the CSMA_CONFIG1 register value */
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ret = spirit_reg_read(spirit, CSMA_CONFIG1_BASE, ®val, 1);
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if (ret >= 0)
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{
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/* Build the new value for the BU prescaler */
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regval &= 0x03;
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regval |= (prescaler << 2);
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/* Write the new value on the CSMA_CONFIG1_BASE register */
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ret = spirit_reg_write(spirit, CSMA_CONFIG1_BASE, ®val, 1);
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}
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return ret;
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}
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/******************************************************************************
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* Name: spirit_csma_get_buprescaler
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*
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* Description:
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* Returns the BU prescaler.
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*
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* Input Parameters:
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* spirit - Reference to a Spirit library state structure instance
|
|
*
|
|
* Returned Value:
|
|
* Value back-off unit (BU).
|
|
*
|
|
******************************************************************************/
|
|
|
|
uint8_t spirit_csma_get_buprescaler(FAR struct spirit_library_s *spirit)
|
|
{
|
|
uint8_t regval;
|
|
|
|
/* Reads the CSMA_CONFIG1 register value */
|
|
|
|
spirit_reg_read(spirit, CSMA_CONFIG1_BASE, ®val, 1);
|
|
|
|
/* Build and return the BU prescaler value */
|
|
|
|
return (regval >> 2);
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_set_ccaperiod
|
|
*
|
|
* Description:
|
|
* Sets the CCA period.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
* multbit - Value of CCA period to store. This parameter can be a value
|
|
* of enum spirit_cca_period_e.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success; A negated errno value is returned on any failure.
|
|
*
|
|
******************************************************************************/
|
|
|
|
int spirit_csma_set_ccaperiod(FAR struct spirit_library_s *spirit,
|
|
enum spirit_cca_period_e multbit)
|
|
{
|
|
uint8_t regval;
|
|
int ret;
|
|
|
|
/* Check the parameters */
|
|
|
|
DEBUGASSERT(IS_CCA_PERIOD(multbit));
|
|
|
|
/* Reads the CSMA_CONFIG1 register value */
|
|
|
|
ret = spirit_reg_read(spirit, CSMA_CONFIG1_BASE, ®val, 1);
|
|
if (ret >= 0)
|
|
{
|
|
/* Build the new value setting the the CCA period */
|
|
|
|
regval &= 0xfc;
|
|
regval |= multbit;
|
|
|
|
/* Write the new value on the CSMA_CONFIG1 register */
|
|
|
|
ret = spirit_reg_write(spirit, CSMA_CONFIG1_BASE, ®val, 1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_get_ccaperiod
|
|
*
|
|
* Description:
|
|
* Returns the CCA period.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
*
|
|
* Returned Value:
|
|
* CCA period.
|
|
*
|
|
******************************************************************************/
|
|
|
|
enum spirit_cca_period_e
|
|
spirit_csma_get_ccaperiod(FAR struct spirit_library_s *spirit)
|
|
{
|
|
uint8_t regval;
|
|
|
|
/* Reads the CSMA_CONFIG1 register value */
|
|
|
|
spirit_reg_read(spirit, CSMA_CONFIG1_BASE, ®val, 1);
|
|
|
|
/* Build and return the CCA period value */
|
|
|
|
return (enum spirit_cca_period_e) (regval & 0x03);
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_set_ccalen
|
|
*
|
|
* Description:
|
|
* Sets the CCA length.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
* ccalen - The CCA length (a value between 1 and 15 that multiplies the
|
|
* CCA period). This parameter can be any value of enum
|
|
* spirit_csmalen_e.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success; A negated errno value is returned on any failure.
|
|
*
|
|
******************************************************************************/
|
|
|
|
int spirit_csma_set_ccalen(FAR struct spirit_library_s *spirit,
|
|
enum spirit_csmalen_e ccalen)
|
|
{
|
|
uint8_t regval;
|
|
int ret;
|
|
|
|
/* Check the parameters */
|
|
|
|
DEBUGASSERT(IS_CSMA_LENGTH(ccalen));
|
|
|
|
/* Reads the CSMA_CONFIG0 register value */
|
|
|
|
ret = spirit_reg_read(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
if (ret >= 0)
|
|
{
|
|
/* Build the value of CCA length to be set */
|
|
|
|
regval &= 0x0f;
|
|
regval |= ccalen;
|
|
|
|
/* Write the new value on the CSMA_CONFIG0 register */
|
|
|
|
ret = spirit_reg_write(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_get_ccalen
|
|
*
|
|
* Description:
|
|
* Returns the CCA length.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
*
|
|
* Returned Value:
|
|
* CCA length.
|
|
*
|
|
******************************************************************************/
|
|
|
|
uint8_t spirit_csma_get_ccalen(FAR struct spirit_library_s *spirit)
|
|
{
|
|
uint8_t regval;
|
|
|
|
/* Reads the CSMA_CONFIG0 register value */
|
|
|
|
spirit_reg_read(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
|
|
/* Build and return the CCA length */
|
|
|
|
return regval >> 4;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_set_maxbackoff
|
|
*
|
|
* Description:
|
|
* Sets the max number of back-off. If reached Spirit stops the transmission.
|
|
*
|
|
* Input Parameters:
|
|
* maxnb the max number of back-off.
|
|
* This parameter is an uint8_t.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success; A negated errno value is returned on any failure.
|
|
*
|
|
******************************************************************************/
|
|
|
|
int spirit_csma_set_maxbackoff(FAR struct spirit_library_s *spirit,
|
|
uint8_t maxnb)
|
|
{
|
|
uint8_t regval;
|
|
int ret;
|
|
|
|
/* Check the parameters */
|
|
|
|
DEBUGASSERT(IS_CMAX_NB(maxnb));
|
|
|
|
/* Reads the CSMA_CONFIG0 register value */
|
|
|
|
ret = spirit_reg_read(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
if (ret >= 0)
|
|
{
|
|
/* Build the value of max back off to be set */
|
|
|
|
regval &= 0xf8;
|
|
regval |= maxnb;
|
|
|
|
/* Write the new value on the CSMA_CONFIG0 register */
|
|
|
|
ret = spirit_reg_write(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* Name: spirit_csma_get_maxbackoff
|
|
*
|
|
* Description:
|
|
* Returns the max number of back-off.
|
|
*
|
|
* Input Parameters:
|
|
* spirit - Reference to a Spirit library state structure instance
|
|
*
|
|
* Returned Value:
|
|
* Max number of back-off.
|
|
*
|
|
******************************************************************************/
|
|
|
|
uint8_t spirit_csma_get_maxbackoff(FAR struct spirit_library_s *spirit)
|
|
{
|
|
uint8_t regval;
|
|
|
|
/* Reads the CSMA_CONFIG0 register value */
|
|
|
|
spirit_reg_read(spirit, CSMA_CONFIG0_BASE, ®val, 1);
|
|
|
|
/* Build and return the max number of back-off */
|
|
|
|
return (regval & 0x07);
|
|
}
|