Diff: stm32746g_discovery_eeprom.c

Revision:

1:ee089790cdbb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stm32746g_discovery_eeprom.c	Mon Jan 04 15:19:15 2016 +0000
@@ -0,0 +1,474 @@
+/**
+  ******************************************************************************
+  * @file    stm32746g_discovery_eeprom.c
+  * @author  MCD Application Team
+  * @version V1.0.0
+  * @date    25-June-2015
+  * @brief   This file provides a set of functions needed to manage an I2C M24LR64 
+  *          EEPROM memory.
+  @verbatim
+             To be able to use this driver, the switch EE_M24LR64 must be defined
+             in your toolchain compiler preprocessor
+             
+             =================================================================== 
+             Notes:
+              - The I2C EEPROM memory (M24LR64) is available on separate daughter 
+                board ANT7-M24LR-A, which is not provided with the STM32746G_DISCOVERY
+                board.
+                To use this driver you have to connect the ANT7-M24LR-A to CN3 
+                connector of STM32746G_DISCOVERY board.
+             ===================================================================
+                 
+             It implements a high level communication layer for read and write 
+             from/to this memory. The needed STM32F7xx hardware resources (I2C and
+             GPIO) are defined in stm32746g_discovery.h file, and the initialization is
+             performed in EEPROM_IO_Init() function declared in stm32746g_discovery.c
+             file.
+             You can easily tailor this driver to any other development board, 
+             by just adapting the defines for hardware resources and 
+             EEPROM_IO_Init() function. 
+           
+             @note In this driver, basic read and write functions (BSP_EEPROM_ReadBuffer() 
+                   and BSP_EEPROM_WritePage()) use DMA mode to perform the data 
+                   transfer to/from EEPROM memory.
+   
+            @note   Regarding BSP_EEPROM_WritePage(), it is an optimized function to perform
+                   small write (less than 1 page) BUT the number of bytes (combined to write start address) must not
+                   cross the EEPROM page boundary. This function can only writes into
+                   the boundaries of an EEPROM page.
+                   This function doesn't check on boundaries condition (in this driver 
+                   the function BSP_EEPROM_WriteBuffer() which calls BSP_EEPROM_WritePage() is 
+                   responsible of checking on Page boundaries).
+    
+                
+        +-----------------------------------------------------------------+
+        |               Pin assignment for M24LR64 EEPROM                 |
+        +---------------------------------------+-----------+-------------+
+        |  STM32F7xx I2C Pins                   |   EEPROM  |   Pin       |
+        +---------------------------------------+-----------+-------------+
+        | .                                     |   E0(GND) |    1  (0V)  |
+        | .                                     |   AC0     |    2        |
+        | .                                     |   AC1     |    3        |
+        | .                                     |   VSS     |    4  (0V)  |
+        | SDA                                   |   SDA     |    5        |
+        | SCL                                   |   SCL     |    6        |
+        | .                                     |   E1(GND) |    7  (0V)  |
+        | .                                     |   VDD     |    8 (3.3V) |
+        +---------------------------------------+-----------+-------------+
+  @endverbatim   
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+/* Includes ------------------------------------------------------------------*/
+#include "stm32746g_discovery_eeprom.h"
+
+/** @addtogroup BSP
+  * @{
+  */
+  
+/** @addtogroup STM32746G_DISCOVERY
+  * @{
+  */ 
+  
+/** @addtogroup STM32746G_DISCOVERY_EEPROM
+  * @brief This file includes the I2C EEPROM driver of STM32746G-Discovery board.
+  * @{
+  */ 
+
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Private_Types STM32746G_DISCOVERY_EEPROM Private Types
+  * @{
+  */ 
+/**
+  * @}
+  */ 
+
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Private_Defines STM32746G_DISCOVERY_EEPROM Private Defines
+  * @{
+  */  
+/**
+  * @}
+  */ 
+
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Private_Macros STM32746G_DISCOVERY_EEPROM Private Macros
+  * @{
+  */
+/**
+  * @}
+  */ 
+  
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Private_Variables STM32746G_DISCOVERY_EEPROM Private Variables
+  * @{
+  */
+__IO uint16_t EEPROMAddress = 0;
+__IO uint16_t EEPROMDataRead;
+__IO uint8_t  EEPROMDataWrite;
+/**
+  * @}
+  */ 
+
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Private_Function_Prototypes STM32746G_DISCOVERY_EEPROM Private Function Prototypes
+  * @{
+  */ 
+/**
+  * @}
+  */ 
+
+/** @defgroup STM32746G_DISCOVERY_EEPROM_Exported_Functions STM32746G_DISCOVERY_EEPROM Exported Functions
+  * @{
+  */ 
+
+/**
+  * @brief  Initializes peripherals used by the I2C EEPROM driver.
+  * 
+  * @note   There are 2 different versions of M24LR64 (A01 & A02).
+  *             Then try to connect on 1st one (EEPROM_I2C_ADDRESS_A01) 
+  *             and if problem, check the 2nd one (EEPROM_I2C_ADDRESS_A02)
+  * @retval EEPROM_OK (0) if operation is correctly performed, else return value 
+  *         different from EEPROM_OK (0)
+  */
+uint32_t BSP_EEPROM_Init(void)
+{ 
+  /* I2C Initialization */
+  EEPROM_IO_Init();
+  
+  /* Select the EEPROM address for A01 and check if OK */
+  EEPROMAddress = EEPROM_I2C_ADDRESS_A01;
+  if(EEPROM_IO_IsDeviceReady(EEPROMAddress, EEPROM_MAX_TRIALS) != HAL_OK) 
+  {
+    /* Select the EEPROM address for A02 and check if OK */
+    EEPROMAddress = EEPROM_I2C_ADDRESS_A02;
+    if(EEPROM_IO_IsDeviceReady(EEPROMAddress, EEPROM_MAX_TRIALS) != HAL_OK)
+    {
+      return EEPROM_FAIL;
+    }
+  }
+  return EEPROM_OK;
+}
+
+/**
+  * @brief  DeInitializes the EEPROM.
+  * @retval EEPROM state
+  */
+uint8_t BSP_EEPROM_DeInit(void)
+{ 
+  /* I2C won't be disabled because common to other functionalities */
+  return EEPROM_OK;
+}
+
+/**
+  * @brief  Reads a block of data from the EEPROM.
+  * @param  pBuffer: pointer to the buffer that receives the data read from 
+  *         the EEPROM.
+  * @param  ReadAddr: EEPROM's internal address to start reading from.
+  * @param  NumByteToRead: pointer to the variable holding number of bytes to 
+  *         be read from the EEPROM.
+  * 
+  *        @note The variable pointed by NumByteToRead is reset to 0 when all the 
+  *              data are read from the EEPROM. Application should monitor this 
+  *              variable in order know when the transfer is complete.
+  * 
+  * @retval EEPROM_OK (0) if operation is correctly performed, else return value 
+  *         different from EEPROM_OK (0) or the timeout user callback.
+  */
+uint32_t BSP_EEPROM_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t* NumByteToRead)
+{  
+  uint32_t buffersize = *NumByteToRead;
+  
+  /* Set the pointer to the Number of data to be read. This pointer will be used 
+     by the DMA Transfer Completer interrupt Handler in order to reset the 
+     variable to 0. User should check on this variable in order to know if the 
+     DMA transfer has been complete or not. */
+  EEPROMDataRead = *NumByteToRead;
+  
+  if(EEPROM_IO_ReadData(EEPROMAddress, ReadAddr, pBuffer, buffersize) != HAL_OK)
+  {
+    BSP_EEPROM_TIMEOUT_UserCallback();
+    return EEPROM_FAIL;
+  }
+
+  /* If all operations OK, return EEPROM_OK (0) */
+  return EEPROM_OK;
+}
+
+/**
+  * @brief  Writes more than one byte to the EEPROM with a single WRITE cycle.
+  *
+  * @note   The number of bytes (combined to write start address) must not 
+  *         cross the EEPROM page boundary. This function can only write into
+  *         the boundaries of an EEPROM page.
+  *         This function doesn't check on boundaries condition (in this driver 
+  *         the function BSP_EEPROM_WriteBuffer() which calls BSP_EEPROM_WritePage() is 
+  *         responsible of checking on Page boundaries).
+  * 
+  * @param  pBuffer: pointer to the buffer containing the data to be written to 
+  *         the EEPROM.
+  * @param  WriteAddr: EEPROM's internal address to write to.
+  * @param  NumByteToWrite: pointer to the variable holding number of bytes to 
+  *         be written into the EEPROM. 
+  * 
+  *        @note The variable pointed by NumByteToWrite is reset to 0 when all the 
+  *              data are written to the EEPROM. Application should monitor this 
+  *              variable in order know when the transfer is complete.
+  * 
+  *        @note This function just configure the communication and enable the DMA 
+  *              channel to transfer data. Meanwhile, the user application may perform 
+  *              other tasks in parallel.
+  * 
+  * @retval EEPROM_OK (0) if operation is correctly performed, else return value 
+  *         different from EEPROM_OK (0) or the timeout user callback.
+  */
+uint32_t BSP_EEPROM_WritePage(uint8_t* pBuffer, uint16_t WriteAddr, uint8_t* NumByteToWrite)
+{ 
+  uint32_t buffersize = *NumByteToWrite;
+  uint32_t status = EEPROM_OK;
+  
+  /* Set the pointer to the Number of data to be written. This pointer will be used 
+      by the DMA Transfer Completer interrupt Handler in order to reset the 
+      variable to 0. User should check on this variable in order to know if the 
+      DMA transfer has been complete or not. */
+  EEPROMDataWrite = *NumByteToWrite;  
+  
+  if(EEPROM_IO_WriteData(EEPROMAddress, WriteAddr, pBuffer, buffersize) != HAL_OK)
+  {
+    BSP_EEPROM_TIMEOUT_UserCallback();
+    status = EEPROM_FAIL;
+  }
+  
+  if(BSP_EEPROM_WaitEepromStandbyState() != EEPROM_OK) 
+  {
+    return EEPROM_FAIL;
+  }
+  
+  /* If all operations OK, return EEPROM_OK (0) */
+  return status;
+}
+
+/**
+  * @brief  Writes buffer of data to the I2C EEPROM.
+  * @param  pBuffer: pointer to the buffer  containing the data to be written 
+  *         to the EEPROM.
+  * @param  WriteAddr: EEPROM's internal address to write to.
+  * @param  NumByteToWrite: number of bytes to write to the EEPROM.
+  * @retval EEPROM_OK (0) if operation is correctly performed, else return value 
+  *         different from EEPROM_OK (0) or the timeout user callback.
+  */
+uint32_t BSP_EEPROM_WriteBuffer(uint8_t *pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
+{
+  uint16_t numofpage = 0, numofsingle = 0, count = 0;
+  uint16_t addr = 0;
+  uint8_t  dataindex = 0;
+  uint32_t status = EEPROM_OK;
+
+  addr = WriteAddr % EEPROM_PAGESIZE;
+  count = EEPROM_PAGESIZE - addr;
+  numofpage =  NumByteToWrite / EEPROM_PAGESIZE;
+  numofsingle = NumByteToWrite % EEPROM_PAGESIZE;
+ 
+  /* If WriteAddr is EEPROM_PAGESIZE aligned */
+  if(addr == 0) 
+  {
+    /* If NumByteToWrite < EEPROM_PAGESIZE */
+    if(numofpage == 0) 
+    {
+      /* Store the number of data to be written */
+      dataindex = numofsingle;
+      /* Start writing data */
+      status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+      if(status != EEPROM_OK)
+      {
+        return status;
+      }
+    }
+    /* If NumByteToWrite > EEPROM_PAGESIZE */
+    else  
+    {
+      while(numofpage--)
+      {
+        /* Store the number of data to be written */
+        dataindex = EEPROM_PAGESIZE;        
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+        
+        WriteAddr +=  EEPROM_PAGESIZE;
+        pBuffer += EEPROM_PAGESIZE;
+      }
+      
+      if(numofsingle!=0)
+      {
+        /* Store the number of data to be written */
+        dataindex = numofsingle;          
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+      }
+    }
+  }
+  /* If WriteAddr is not EEPROM_PAGESIZE aligned */
+  else 
+  {
+    /* If NumByteToWrite < EEPROM_PAGESIZE */
+    if(numofpage== 0) 
+    {
+      /* If the number of data to be written is more than the remaining space 
+      in the current page: */
+      if(NumByteToWrite > count)
+      {
+        /* Store the number of data to be written */
+        dataindex = count;        
+        /* Write the data contained in same page */
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+        
+        /* Store the number of data to be written */
+        dataindex = (NumByteToWrite - count);          
+        /* Write the remaining data in the following page */
+        status = BSP_EEPROM_WritePage((uint8_t*)(pBuffer + count), (WriteAddr + count), (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+      }      
+      else      
+      {
+        /* Store the number of data to be written */
+        dataindex = numofsingle;         
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+      }     
+    }
+    /* If NumByteToWrite > EEPROM_PAGESIZE */
+    else
+    {
+      NumByteToWrite -= count;
+      numofpage =  NumByteToWrite / EEPROM_PAGESIZE;
+      numofsingle = NumByteToWrite % EEPROM_PAGESIZE;
+      
+      if(count != 0)
+      {  
+        /* Store the number of data to be written */
+        dataindex = count;         
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+        WriteAddr += count;
+        pBuffer += count;
+      } 
+      
+      while(numofpage--)
+      {
+        /* Store the number of data to be written */
+        dataindex = EEPROM_PAGESIZE;          
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+        WriteAddr +=  EEPROM_PAGESIZE;
+        pBuffer += EEPROM_PAGESIZE;  
+      }
+      if(numofsingle != 0)
+      {
+        /* Store the number of data to be written */
+        dataindex = numofsingle;           
+        status = BSP_EEPROM_WritePage(pBuffer, WriteAddr, (uint8_t*)(&dataindex));
+        if(status != EEPROM_OK)
+        {
+          return status;
+        }
+      }
+    }
+  }  
+                                   
+  /* If all operations OK, return EEPROM_OK (0) */
+  return EEPROM_OK;
+}
+
+/**
+  * @brief  Wait for EEPROM Standby state.
+  * 
+  * @note  This function allows to wait and check that EEPROM has finished the 
+  *        last operation. It is mostly used after Write operation: after receiving
+  *        the buffer to be written, the EEPROM may need additional time to actually
+  *        perform the write operation. During this time, it doesn't answer to
+  *        I2C packets addressed to it. Once the write operation is complete
+  *        the EEPROM responds to its address.
+  * 
+  * @retval EEPROM_OK (0) if operation is correctly performed, else return value 
+  *         different from EEPROM_OK (0) or the timeout user callback.
+  */
+uint32_t BSP_EEPROM_WaitEepromStandbyState(void)      
+{
+  /* Check if the maximum allowed number of trials has bee reached */
+  if(EEPROM_IO_IsDeviceReady(EEPROMAddress, EEPROM_MAX_TRIALS) != HAL_OK)
+  {
+    /* If the maximum number of trials has been reached, exit the function */
+    BSP_EEPROM_TIMEOUT_UserCallback();
+    return EEPROM_TIMEOUT;
+  }
+  return EEPROM_OK;
+}
+
+/**
+  * @brief  Basic management of the timeout situation.
+  * @retval None
+  */
+__weak void BSP_EEPROM_TIMEOUT_UserCallback(void)
+{
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/