stm32l4xx_hal_lcd.c

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/**
  ******************************************************************************
  * @file    stm32l4xx_hal_lcd.c
  * @author  MCD Application Team
  * @brief   LCD Controller HAL module driver.
  *          This file provides firmware functions to manage the following
  *          functionalities of the LCD Controller (LCD) peripheral:
  *           + Initialization/de-initialization methods
  *           + I/O operation methods
  *           + Peripheral State methods
  *
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file in
  * the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  ******************************************************************************
  @verbatim
  ==============================================================================
                        ##### How to use this driver #####
  ==============================================================================
      [..] The LCD HAL driver can be used as follows:

      (#) Declare a LCD_HandleTypeDef handle structure.

      -@- The frequency generator allows you to achieve various LCD frame rates
          starting from an LCD input clock frequency (LCDCLK) which can vary
          from 32 kHz up to 1 MHz.

      (#) Initialize the LCD low level resources by implementing the HAL_LCD_MspInit() API:

          (++) Enable the LCDCLK (same as RTCCLK): to configure the RTCCLK/LCDCLK, proceed as follows:
               (+++) Use RCC function HAL_RCCEx_PeriphCLKConfig in indicating RCC_PERIPHCLK_LCD and
                  selected clock source (HSE, LSI or LSE)

          (++) LCD pins configuration:
              (+++) Enable the clock for the LCD GPIOs.
              (+++) Configure these LCD pins as alternate function no-pull.
          (++) Enable the LCD interface clock.


      (#) Program the Prescaler, Divider, Blink mode, Blink Frequency Duty, Bias,
          Voltage Source, Dead Time, Pulse On Duration, Contrast, High drive and Multiplexer
          Segment in the Init structure of the LCD handle.

      (#) Initialize the LCD registers by calling the HAL_LCD_Init() API.

      -@- The HAL_LCD_Init() API configures also the low level Hardware GPIO, CLOCK, ...etc)
          by calling the customized HAL_LCD_MspInit() API.
      -@- After calling the HAL_LCD_Init() the LCD RAM memory is cleared

      (#) Optionally you can update the LCD configuration using these macros:
              (++) LCD High Drive using the __HAL_LCD_HIGHDRIVER_ENABLE() and __HAL_LCD_HIGHDRIVER_DISABLE() macros
              (++) Voltage output buffer using __HAL_LCD_VOLTAGE_BUFFER_ENABLE() and __HAL_LCD_VOLTAGE_BUFFER_DISABLE() macros
              (++) LCD Pulse ON Duration using the __HAL_LCD_PULSEONDURATION_CONFIG() macro
              (++) LCD Dead Time using the __HAL_LCD_DEADTIME_CONFIG() macro
              (++) The LCD Blink mode and frequency using the __HAL_LCD_BLINK_CONFIG() macro
              (++) The LCD Contrast using the __HAL_LCD_CONTRAST_CONFIG() macro

      (#) Write to the LCD RAM memory using the HAL_LCD_Write() API, this API can be called
          more time to update the different LCD RAM registers before calling
          HAL_LCD_UpdateDisplayRequest() API.

      (#) The HAL_LCD_Clear() API can be used to clear the LCD RAM memory.

      (#) When LCD RAM memory is updated enable the update display request using
          the HAL_LCD_UpdateDisplayRequest() API.

      [..] LCD and low power modes:
           (#) The LCD remain active during Sleep, Low Power run, Low Power Sleep and
               STOP modes.

  @endverbatim
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

#if defined(STM32L433xx) || defined(STM32L443xx) || defined(STM32L476xx) || defined(STM32L486xx) || defined(STM32L496xx) || defined(STM32L4A6xx)

/** @addtogroup STM32L4xx_HAL_Driver
  * @{
  */

#ifdef HAL_LCD_MODULE_ENABLED

/** @defgroup LCD LCD
  * @brief LCD HAL module driver
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup LCD_Private_Defines LCD Private Defines
  * @{
  */

#define LCD_TIMEOUT_VALUE             1000U

/**
  * @}
  */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/

/** @defgroup LCD_Exported_Functions LCD Exported Functions
  * @{
  */

/** @defgroup LCD_Exported_Functions_Group1 Initialization/de-initialization methods
  *  @brief    Initialization and Configuration functions
  *
@verbatim
===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..]

@endverbatim
  * @{
  */

/**
  * @brief  Initialize the LCD peripheral according to the specified parameters
  *         in the LCD_InitStruct and initialize the associated handle.
  * @note   This function can be used only when the LCD is disabled.
  * @param hlcd LCD handle
  * @retval None
  */
HAL_StatusTypeDef HAL_LCD_Init(LCD_HandleTypeDef *hlcd)
{
  uint32_t tickstart;
  uint32_t counter;
  HAL_StatusTypeDef status;

  /* Check the LCD handle allocation */
  if (hlcd == NULL)
  {
    return HAL_ERROR;
  }

  /* Check function parameters */
  assert_param(IS_LCD_ALL_INSTANCE(hlcd->Instance));
  assert_param(IS_LCD_PRESCALER(hlcd->Init.Prescaler));
  assert_param(IS_LCD_DIVIDER(hlcd->Init.Divider));
  assert_param(IS_LCD_DUTY(hlcd->Init.Duty));
  assert_param(IS_LCD_BIAS(hlcd->Init.Bias));
  assert_param(IS_LCD_VOLTAGE_SOURCE(hlcd->Init.VoltageSource));
  assert_param(IS_LCD_PULSE_ON_DURATION(hlcd->Init.PulseOnDuration));
  assert_param(IS_LCD_HIGH_DRIVE(hlcd->Init.HighDrive));
  assert_param(IS_LCD_DEAD_TIME(hlcd->Init.DeadTime));
  assert_param(IS_LCD_CONTRAST(hlcd->Init.Contrast));
  assert_param(IS_LCD_BLINK_FREQUENCY(hlcd->Init.BlinkFrequency));
  assert_param(IS_LCD_BLINK_MODE(hlcd->Init.BlinkMode));
  assert_param(IS_LCD_MUX_SEGMENT(hlcd->Init.MuxSegment));

  if (hlcd->State == HAL_LCD_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hlcd->Lock = HAL_UNLOCKED;

    /* Initialize the low level hardware (MSP) */
    HAL_LCD_MspInit(hlcd);
  }

  hlcd->State = HAL_LCD_STATE_BUSY;

  /* Disable the peripheral */
  __HAL_LCD_DISABLE(hlcd);

  /* Clear the LCD_RAM registers and enable the display request by setting the UDR bit
     in the LCD_SR register */
  for (counter = LCD_RAM_REGISTER0; counter <= LCD_RAM_REGISTER15; counter++)
  {
    hlcd->Instance->RAM[counter] = 0;
  }
  /* Enable the display request */
  hlcd->Instance->SR |= LCD_SR_UDR;
  /* Configure the LCD Prescaler, Divider, Blink mode and Blink Frequency:
     Set PS[3:0] bits according to hlcd->Init.Prescaler value
     Set DIV[3:0] bits according to hlcd->Init.Divider value
     Set BLINK[1:0] bits according to hlcd->Init.BlinkMode value
     Set BLINKF[2:0] bits according to hlcd->Init.BlinkFrequency value
     Set DEAD[2:0] bits according to hlcd->Init.DeadTime value
     Set PON[2:0] bits according to hlcd->Init.PulseOnDuration value
     Set CC[2:0] bits according to hlcd->Init.Contrast value
     Set HD bit according to hlcd->Init.HighDrive value */
  MODIFY_REG(hlcd->Instance->FCR, \
             (LCD_FCR_PS | LCD_FCR_DIV | LCD_FCR_BLINK | LCD_FCR_BLINKF | \
              LCD_FCR_DEAD | LCD_FCR_PON | LCD_FCR_CC | LCD_FCR_HD), \
             (hlcd->Init.Prescaler | hlcd->Init.Divider | hlcd->Init.BlinkMode | hlcd->Init.BlinkFrequency | \
              hlcd->Init.DeadTime | hlcd->Init.PulseOnDuration | hlcd->Init.Contrast | hlcd->Init.HighDrive));

  /* Wait until LCD Frame Control Register Synchronization flag (FCRSF) is set in the LCD_SR register
     This bit is set by hardware each time the LCD_FCR register is updated in the LCDCLK
     domain. It is cleared by hardware when writing to the LCD_FCR register.*/
  status = LCD_WaitForSynchro(hlcd);
  if (status != HAL_OK)
  {
    return status;
  }

  /* Configure the LCD Duty, Bias, Voltage Source, Dead Time, Pulse On Duration and Contrast:
     Set DUTY[2:0] bits according to hlcd->Init.Duty value
     Set BIAS[1:0] bits according to hlcd->Init.Bias value
     Set VSEL bit according to hlcd->Init.VoltageSource value
     Set MUX_SEG bit according to hlcd->Init.MuxSegment value */
  MODIFY_REG(hlcd->Instance->CR, \
             (LCD_CR_DUTY | LCD_CR_BIAS | LCD_CR_VSEL | LCD_CR_MUX_SEG), \
             (hlcd->Init.Duty | hlcd->Init.Bias | hlcd->Init.VoltageSource | hlcd->Init.MuxSegment));

  /* Enable the peripheral */
  __HAL_LCD_ENABLE(hlcd);

  /* Get timeout */
  tickstart = HAL_GetTick();

  /* Wait Until the LCD is enabled */
  while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_ENS) == RESET)
  {
    if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
    {
      hlcd->ErrorCode = HAL_LCD_ERROR_ENS;
      return HAL_TIMEOUT;
    }
  }

  /* Get timeout */
  tickstart = HAL_GetTick();

  /*!< Wait Until the LCD Booster is ready */
  while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_RDY) == RESET)
  {
    if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
    {
      hlcd->ErrorCode = HAL_LCD_ERROR_RDY;
      return HAL_TIMEOUT;
    }
  }

  /* Initialize the LCD state */
  hlcd->ErrorCode = HAL_LCD_ERROR_NONE;
  hlcd->State = HAL_LCD_STATE_READY;

  return status;
}

/**
  * @brief  DeInitialize the LCD peripheral.
  * @param hlcd LCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_LCD_DeInit(LCD_HandleTypeDef *hlcd)
{
  /* Check the LCD handle allocation */
  if (hlcd == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_LCD_ALL_INSTANCE(hlcd->Instance));

  hlcd->State = HAL_LCD_STATE_BUSY;

  /* DeInit the low level hardware */
  HAL_LCD_MspDeInit(hlcd);

  hlcd->ErrorCode = HAL_LCD_ERROR_NONE;
  hlcd->State = HAL_LCD_STATE_RESET;

  /* Release Lock */
  __HAL_UNLOCK(hlcd);

  return HAL_OK;
}

/**
  * @brief  DeInitialize the LCD MSP.
  * @param hlcd LCD handle
  * @retval None
  */
__weak void HAL_LCD_MspDeInit(LCD_HandleTypeDef *hlcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hlcd);

  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_LCD_MspDeInit it to be implemented in the user file
   */
}

/**
  * @brief  Initialize the LCD MSP.
  * @param hlcd LCD handle
  * @retval None
  */
__weak void HAL_LCD_MspInit(LCD_HandleTypeDef *hlcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hlcd);

  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_LCD_MspInit is to be implemented in the user file
   */
}

/**
  * @}
  */

/** @defgroup LCD_Exported_Functions_Group2 IO operation methods
  *  @brief LCD RAM functions
  *
@verbatim
 ===============================================================================
                      ##### IO operation functions #####
 ===============================================================================
 [..] Using its double buffer memory the LCD controller ensures the coherency of the
 displayed information without having to use interrupts to control LCD_RAM
 modification.
 The application software can access the first buffer level (LCD_RAM) through
 the APB interface. Once it has modified the LCD_RAM using the HAL_LCD_Write() API,
 it sets the UDR flag in the LCD_SR register using the HAL_LCD_UpdateDisplayRequest() API.
 This UDR flag (update display request) requests the updated information to be
 moved into the second buffer level (LCD_DISPLAY).
 This operation is done synchronously with the frame (at the beginning of the
 next frame), until the update is completed, the LCD_RAM is write protected and
 the UDR flag stays high.
 Once the update is completed another flag (UDD - Update Display Done) is set and
 generates an interrupt if the UDDIE bit in the LCD_FCR register is set.
 The time it takes to update LCD_DISPLAY is, in the worst case, one odd and one
 even frame.
 The update will not occur (UDR = 1 and UDD = 0) until the display is
 enabled (LCDEN = 1).

@endverbatim
  * @{
  */

/**
  * @brief  Write a word in the specific LCD RAM.
  * @param hlcd LCD handle
  * @param RAMRegisterIndex specifies the LCD RAM Register.
  *   This parameter can be one of the following values:
  *     @arg LCD_RAM_REGISTER0: LCD RAM Register 0
  *     @arg LCD_RAM_REGISTER1: LCD RAM Register 1
  *     @arg LCD_RAM_REGISTER2: LCD RAM Register 2
  *     @arg LCD_RAM_REGISTER3: LCD RAM Register 3
  *     @arg LCD_RAM_REGISTER4: LCD RAM Register 4
  *     @arg LCD_RAM_REGISTER5: LCD RAM Register 5
  *     @arg LCD_RAM_REGISTER6: LCD RAM Register 6
  *     @arg LCD_RAM_REGISTER7: LCD RAM Register 7
  *     @arg LCD_RAM_REGISTER8: LCD RAM Register 8
  *     @arg LCD_RAM_REGISTER9: LCD RAM Register 9
  *     @arg LCD_RAM_REGISTER10: LCD RAM Register 10
  *     @arg LCD_RAM_REGISTER11: LCD RAM Register 11
  *     @arg LCD_RAM_REGISTER12: LCD RAM Register 12
  *     @arg LCD_RAM_REGISTER13: LCD RAM Register 13
  *     @arg LCD_RAM_REGISTER14: LCD RAM Register 14
  *     @arg LCD_RAM_REGISTER15: LCD RAM Register 15
  * @param RAMRegisterMask specifies the LCD RAM Register Data Mask.
  * @param Data specifies LCD Data Value to be written.
  * @retval None
  */
HAL_StatusTypeDef HAL_LCD_Write(LCD_HandleTypeDef *hlcd, uint32_t RAMRegisterIndex, uint32_t RAMRegisterMask, uint32_t Data)
{
  uint32_t tickstart;
  HAL_LCD_StateTypeDef state = hlcd->State;
  
  if ((state == HAL_LCD_STATE_READY) || (state == HAL_LCD_STATE_BUSY))
  {
    /* Check the parameters */
    assert_param(IS_LCD_RAM_REGISTER(RAMRegisterIndex));

    if (hlcd->State == HAL_LCD_STATE_READY)
    {
      /* Process Locked */
      __HAL_LOCK(hlcd);
      hlcd->State = HAL_LCD_STATE_BUSY;

      /* Get timeout */
      tickstart = HAL_GetTick();

      /*!< Wait Until the LCD is ready */
      while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDR) != RESET)
      {
        if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
        {
          hlcd->ErrorCode = HAL_LCD_ERROR_UDR;

          /* Process Unlocked */
          __HAL_UNLOCK(hlcd);

          return HAL_TIMEOUT;
        }
      }
    }

    /* Copy the new Data bytes to LCD RAM register */
    MODIFY_REG(hlcd->Instance->RAM[RAMRegisterIndex], ~(RAMRegisterMask), Data);

    return HAL_OK;
  }
  else
  {
    return HAL_ERROR;
  }
}

/**
  * @brief Clear the LCD RAM registers.
  * @param hlcd LCD handle
  * @retval None
  */
HAL_StatusTypeDef HAL_LCD_Clear(LCD_HandleTypeDef *hlcd)
{
  uint32_t tickstart;
  uint32_t counter;
  HAL_StatusTypeDef status = HAL_ERROR;
  HAL_LCD_StateTypeDef state = hlcd->State;
  
  if ((state == HAL_LCD_STATE_READY) || (state == HAL_LCD_STATE_BUSY))
  {
    /* Process Locked */
    __HAL_LOCK(hlcd);

    hlcd->State = HAL_LCD_STATE_BUSY;

    /* Get timeout */
    tickstart = HAL_GetTick();

    /*!< Wait Until the LCD is ready */
    while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDR) != RESET)
    {
      if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
      {
        hlcd->ErrorCode = HAL_LCD_ERROR_UDR;

        /* Process Unlocked */
        __HAL_UNLOCK(hlcd);

        return HAL_TIMEOUT;
      }
    }
    /* Clear the LCD_RAM registers */
    for (counter = LCD_RAM_REGISTER0; counter <= LCD_RAM_REGISTER15; counter++)
    {
      hlcd->Instance->RAM[counter] = 0;
    }

    /* Update the LCD display */
    status = HAL_LCD_UpdateDisplayRequest(hlcd);
  }
  return status;
}

/**
  * @brief  Enable the Update Display Request.
  * @param hlcd LCD handle
  * @note   Each time software modifies the LCD_RAM it must set the UDR bit to
  *         transfer the updated data to the second level buffer.
  *         The UDR bit stays set until the end of the update and during this
  *         time the LCD_RAM is write protected.
  * @note   When the display is disabled, the update is performed for all
  *         LCD_DISPLAY locations.
  *         When the display is enabled, the update is performed only for locations
  *         for which commons are active (depending on DUTY). For example if
  *         DUTY = 1/2, only the LCD_DISPLAY of COM0 and COM1 will be updated.
  * @retval None
  */
HAL_StatusTypeDef HAL_LCD_UpdateDisplayRequest(LCD_HandleTypeDef *hlcd)
{
  uint32_t tickstart;

  /* Clear the Update Display Done flag before starting the update display request */
  __HAL_LCD_CLEAR_FLAG(hlcd, LCD_FLAG_UDD);

  /* Enable the display request */
  hlcd->Instance->SR |= LCD_SR_UDR;

  /* Get timeout */
  tickstart = HAL_GetTick();

  /*!< Wait Until the LCD display is done */
  while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_UDD) == RESET)
  {
    if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
    {
      hlcd->ErrorCode = HAL_LCD_ERROR_UDD;

      /* Process Unlocked */
      __HAL_UNLOCK(hlcd);

      return HAL_TIMEOUT;
    }
  }

  hlcd->State = HAL_LCD_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hlcd);

  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup LCD_Exported_Functions_Group3 Peripheral State methods
  *  @brief   LCD State functions
  *
@verbatim
 ===============================================================================
                      ##### Peripheral State functions #####
 ===============================================================================
    [..]
     This subsection provides a set of functions allowing to control the LCD:
      (+) HAL_LCD_GetState() API can be helpful to check in run-time the state of the LCD peripheral State.
      (+) HAL_LCD_GetError() API to return the LCD error code.
@endverbatim
  * @{
  */

/**
  * @brief Return the LCD handle state.
  * @param hlcd LCD handle
  * @retval HAL state
  */
HAL_LCD_StateTypeDef HAL_LCD_GetState(LCD_HandleTypeDef *hlcd)
{
  /* Return LCD handle state */
  return hlcd->State;
}

/**
  * @brief Return the LCD error code.
  * @param hlcd LCD handle
  * @retval LCD Error Code
  */
uint32_t HAL_LCD_GetError(LCD_HandleTypeDef *hlcd)
{
  return hlcd->ErrorCode;
}

/**
  * @}
  */

/**
  * @}
  */

/** @defgroup LCD_Private_Functions LCD Private Functions
  * @{
  */

/**
  * @brief  Wait until the LCD FCR register is synchronized in the LCDCLK domain.
  *   This function must be called after any write operation to LCD_FCR register.
  * @retval None
  */
HAL_StatusTypeDef LCD_WaitForSynchro(LCD_HandleTypeDef *hlcd)
{
  uint32_t tickstart;

  /* Get timeout */
  tickstart = HAL_GetTick();

  /* Loop until FCRSF flag is set */
  while (__HAL_LCD_GET_FLAG(hlcd, LCD_FLAG_FCRSF) == RESET)
  {
    if ((HAL_GetTick() - tickstart) > LCD_TIMEOUT_VALUE)
    {
      hlcd->ErrorCode = HAL_LCD_ERROR_FCRSF;
      return HAL_TIMEOUT;
    }
  }

  return HAL_OK;
}

/**
  * @}
  */

/**
  * @}
  */

#endif /* HAL_LCD_MODULE_ENABLED */

/**
  * @}
  */

#endif /* STM32L433xx || STM32L443xx || STM32L476xx || STM32L486xx || STM32L496xx || STM32L4A6xx */