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/**
******************************************************************************
* @file stm32h7xx_ll_delayblock.c
* @author MCD Application Team
* @brief DelayBlock Low Layer HAL module driver.
*
* This file provides firmware functions to manage the following
* functionalities of the Delay Block peripheral:
* + input clock frequency range 25MHz to 208MHz
* + up to 12 oversampling phases
*
@verbatim
==============================================================================
##### DelayBlock peripheral features #####
==============================================================================
[..] The Delay block is used to generate an Output clock which is de-phased from the Input
clock. The phase of the Output clock is programmed by FW. The Output clock is then used
to clock the receive data in i.e. a SDMMC or QSPI interface.
The delay is Voltage and Temperature dependent, which may require FW to do re-tuning
and recenter the Output clock phase to the receive data.
[..] The Delay Block features include the following:
(+) Input clock frequency range 25MHz to 208MHz.
(+) Up to 12 oversampling phases.
##### How to use this driver #####
==============================================================================
[..]
This driver is a considered as a driver of service for external devices drivers
that interfaces with the DELAY peripheral.
The DelayBlock_Enable() function, enables the DelayBlock instance, configure the delay line length
and configure the Output clock phase.
The DelayBlock_Disable() function, disables the DelayBlock instance by setting DEN flag to 0.
@endverbatim
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2017 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32h7xx_hal.h"
/** @addtogroup STM32H7xx_HAL_Driver
* @{
*/
/** @defgroup DELAYBLOCK_LL DELAYBLOCK_LL
* @ingroup RTEMSBSPsARMSTM32H7
* @brief Low layer module for Delay Block
* @{
*/
#if defined(HAL_SD_MODULE_ENABLED) || defined(HAL_QSPI_MODULE_ENABLED)
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define DLYB_TIMEOUT 0xFFU
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup DelayBlock_LL_Exported_Functions Delay Block Low Layer Exported Functions
* @ingroup RTEMSBSPsARMSTM32H7
* @{
*/
/** @defgroup HAL_DELAY_LL_Group1 Initialization de-initialization functions
* @ingroup RTEMSBSPsARMSTM32H7
* @brief Initialization and Configuration functions
*
@verbatim
===============================================================================
##### Initialization and de-initialization functions #####
===============================================================================
[..] This section provides functions allowing to:
@endverbatim
* @{
*/
/**
* @brief Enable the Delay Block instance.
* @param DLYBx: Pointer to DLYB instance.
* @retval HAL status
*/
HAL_StatusTypeDef DelayBlock_Enable(DLYB_TypeDef *DLYBx)
{
uint32_t unit = 0U;
uint32_t sel = 0U;
uint32_t sel_current;
uint32_t unit_current;
uint32_t tuning;
uint32_t lng_mask;
uint32_t tickstart;
DLYBx->CR = DLYB_CR_DEN | DLYB_CR_SEN;
for (sel_current = 0U; sel_current < DLYB_MAX_SELECT; sel_current++)
{
/* lng_mask is the mask bit for the LNG field to check the output of the UNITx*/
lng_mask = DLYB_CFGR_LNG_0 << sel_current;
tuning = 0U;
for (unit_current = 0U; unit_current < DLYB_MAX_UNIT; unit_current++)
{
/* Set the Delay of the UNIT(s)*/
DLYBx->CFGR = DLYB_MAX_SELECT | (unit_current << DLYB_CFGR_UNIT_Pos);
/* Waiting for a LNG valid value */
tickstart = HAL_GetTick();
while ((DLYBx->CFGR & DLYB_CFGR_LNGF) == 0U)
{
if((HAL_GetTick() - tickstart) >= DLYB_TIMEOUT)
{
return HAL_TIMEOUT;
}
}
if (tuning == 0U)
{
if ((DLYBx->CFGR & lng_mask) != 0U)
{
/* 1/2 period HIGH is detected */
tuning = 1U;
}
}
else
{
/* 1/2 period LOW detected after the HIGH 1/2 period => FULL PERIOD passed*/
if((DLYBx->CFGR & lng_mask ) == 0U)
{
/* Save the first result */
if( unit == 0U )
{
unit = unit_current;
sel = sel_current + 1U;
}
break;
}
}
}
}
/* Apply the Tuning settings */
DLYBx->CR = 0U;
DLYBx->CR = DLYB_CR_DEN | DLYB_CR_SEN;
DLYBx->CFGR = sel | (unit << DLYB_CFGR_UNIT_Pos);
DLYBx->CR = DLYB_CR_DEN;
return HAL_OK;
}
/**
* @brief Disable the Delay Block instance.
* @param DLYBx: Pointer to DLYB instance.
* @retval HAL status
*/
HAL_StatusTypeDef DelayBlock_Disable(DLYB_TypeDef *DLYBx)
{
/* Disable DLYB */
DLYBx->CR = 0U;
return HAL_OK;
}
/**
* @brief Configure the Delay Block instance.
* @param DLYBx: Pointer to DLYB instance.
* @param PhaseSel: Phase selection [0..11].
* @param Units: Delay units[0..127].
* @retval HAL status
*/
HAL_StatusTypeDef DelayBlock_Configure(DLYB_TypeDef *DLYBx,uint32_t PhaseSel, uint32_t Units )
{
/* Apply the delay settings */
DLYBx->CR = 0U;
DLYBx->CR = DLYB_CR_DEN | DLYB_CR_SEN;
DLYBx->CFGR = PhaseSel | (Units << DLYB_CFGR_UNIT_Pos);
DLYBx->CR = DLYB_CR_DEN;
return HAL_OK;
}
/**
* @}
*/
/**
* @}
*/
#endif /* (HAL_SD_MODULE_ENABLED) & (HAL_QSPI_MODULE_ENABLED)*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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