2 ******************************************************************************
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3 * @file stm32h745i_discovery_sdram.c
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4 * @author MCD Application Team
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5 * @brief This file includes the SDRAM driver for the MT48LC4M32B2B5-6A memory
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6 * device mounted on STM32H745I_DISCOVERY boards.
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7 ******************************************************************************
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9 How To use this driver:
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10 -----------------------
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11 - This driver is used to drive the MT48LC4M32B2B5-6A SDRAM external memory mounted
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12 on STM32H745I_DISCOVERY board.
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13 - This driver does not need a specific component driver for the SDRAM device
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14 to be included with.
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18 + Initialization steps:
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19 o Initialize the SDRAM external memory using the BSP_SDRAM_Init() function. This
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20 function includes the MSP layer hardware resources initialization and the
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21 FMC controller configuration to interface with the external SDRAM memory.
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22 o It contains the SDRAM initialization sequence to program the SDRAM external
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23 device using the function BSP_SDRAM_Initialization_sequence(). Note that this
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24 sequence is standard for all SDRAM devices, but can include some differences
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25 from a device to another. If it is the case, the right sequence should be
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26 implemented separately.
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28 + SDRAM read/write operations
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29 o SDRAM external memory can be accessed with read/write operations once it is
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31 Read/write operation can be performed with AHB access using the functions
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32 BSP_SDRAM_ReadData()/BSP_SDRAM_WriteData(), or by MDMA transfer using the functions
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33 BSP_SDRAM_ReadData_DMA()/BSP_SDRAM_WriteData_DMA().
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34 o The AHB access is performed with 32-bit width transaction, the MDMA transfer
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35 configuration is fixed at single (no burst) word transfer (see the
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36 SDRAM_MspInit() static function).
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37 o User can implement his own functions for read/write access with his desired
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39 o If interrupt mode is used for MDMA transfer, the function BSP_SDRAM_MDMA_IRQHandler()
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40 is called in IRQ handler file, to serve the generated interrupt once the MDMA
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41 transfer is complete.
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42 o You can send a command to the SDRAM device in runtime using the function
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43 BSP_SDRAM_Sendcmd(), and giving the desired command as parameter chosen between
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44 the predefined commands of the "FMC_SDRAM_CommandTypeDef" structure.
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46 ******************************************************************************
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49 * <h2><center>© Copyright (c) 2019 STMicroelectronics.
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50 * All rights reserved.</center></h2>
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52 * This software component is licensed by ST under BSD 3-Clause license,
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53 * the "License"; You may not use this file except in compliance with the
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54 * License. You may obtain a copy of the License at:
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55 * opensource.org/licenses/BSD-3-Clause
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57 ******************************************************************************
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60 /* Includes ------------------------------------------------------------------*/
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61 #include "stm32h745i_discovery_sdram.h"
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67 /** @addtogroup STM32H745I_DISCOVERY
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71 /** @defgroup STM32H745I_DISCOVERY_SDRAM STM32H745I_DISCOVERY_SDRAM
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76 /** @defgroup STM32H745I_DISCOVERY_SDRAM_Private_Variables Private Variables
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79 SDRAM_HandleTypeDef sdramHandle;
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80 static FMC_SDRAM_TimingTypeDef Timing;
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81 static FMC_SDRAM_CommandTypeDef Command;
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87 /** @defgroup STM32H745I_DISCOVERY_SDRAM_Exported_Functions Exported Functions
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92 * @brief Initializes the SDRAM device.
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93 * @retval SDRAM status
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95 uint8_t BSP_SDRAM_Init(void)
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97 static uint8_t sdramstatus = SDRAM_OK;
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98 /* SDRAM device configuration */
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99 sdramHandle.Instance = FMC_SDRAM_DEVICE;
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101 /* Timing configuration for 100Mhz as SDRAM clock frequency (System clock is up to 200Mhz) */
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102 Timing.LoadToActiveDelay = 2;
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103 Timing.ExitSelfRefreshDelay = 7;
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104 Timing.SelfRefreshTime = 4;
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105 Timing.RowCycleDelay = 7;
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106 Timing.WriteRecoveryTime = 2;
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107 Timing.RPDelay = 2;
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108 Timing.RCDDelay = 2;
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110 sdramHandle.Init.SDBank = FMC_SDRAM_BANK2;
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111 sdramHandle.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
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112 sdramHandle.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
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113 sdramHandle.Init.MemoryDataWidth = SDRAM_MEMORY_WIDTH;
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114 sdramHandle.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
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115 sdramHandle.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
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116 sdramHandle.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
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117 sdramHandle.Init.SDClockPeriod = SDCLOCK_PERIOD;
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118 sdramHandle.Init.ReadBurst = FMC_SDRAM_RBURST_ENABLE;
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119 sdramHandle.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
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121 /* SDRAM controller initialization */
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123 BSP_SDRAM_MspInit(&sdramHandle, NULL); /* __weak function can be rewritten by the application */
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125 if(HAL_SDRAM_Init(&sdramHandle, &Timing) != HAL_OK)
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127 sdramstatus = SDRAM_ERROR;
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131 /* SDRAM initialization sequence */
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132 BSP_SDRAM_Initialization_sequence(REFRESH_COUNT);
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135 return sdramstatus;
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139 * @brief DeInitializes the SDRAM device.
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140 * @retval SDRAM status
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142 uint8_t BSP_SDRAM_DeInit(void)
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144 static uint8_t sdramstatus = SDRAM_OK;
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145 /* SDRAM device de-initialization */
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146 sdramHandle.Instance = FMC_SDRAM_DEVICE;
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148 if(HAL_SDRAM_DeInit(&sdramHandle) != HAL_OK)
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150 sdramstatus = SDRAM_ERROR;
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154 /* SDRAM controller de-initialization */
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155 BSP_SDRAM_MspDeInit(&sdramHandle, NULL);
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158 return sdramstatus;
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162 * @brief Programs the SDRAM device.
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163 * @param RefreshCount: SDRAM refresh counter value
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166 void BSP_SDRAM_Initialization_sequence(uint32_t RefreshCount)
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168 __IO uint32_t tmpmrd = 0;
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170 /* Step 1: Configure a clock configuration enable command */
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171 Command.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
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172 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
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173 Command.AutoRefreshNumber = 1;
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174 Command.ModeRegisterDefinition = 0;
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176 /* Send the command */
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177 HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
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179 /* Step 2: Insert 100 us minimum delay */
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180 /* Inserted delay is equal to 1 ms due to systick time base unit (ms) */
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183 /* Step 3: Configure a PALL (precharge all) command */
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184 Command.CommandMode = FMC_SDRAM_CMD_PALL;
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185 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
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186 Command.AutoRefreshNumber = 1;
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187 Command.ModeRegisterDefinition = 0;
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189 /* Send the command */
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190 HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
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192 /* Step 4: Configure an Auto Refresh command */
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193 Command.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
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194 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
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195 Command.AutoRefreshNumber = 8;
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196 Command.ModeRegisterDefinition = 0;
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198 /* Send the command */
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199 HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
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201 /* Step 5: Program the external memory mode register */
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202 tmpmrd = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_1 |\
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203 SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |\
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204 SDRAM_MODEREG_CAS_LATENCY_3 |\
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205 SDRAM_MODEREG_OPERATING_MODE_STANDARD |\
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206 SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
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208 Command.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
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209 Command.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK2;
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210 Command.AutoRefreshNumber = 1;
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211 Command.ModeRegisterDefinition = tmpmrd;
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213 /* Send the command */
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214 HAL_SDRAM_SendCommand(&sdramHandle, &Command, SDRAM_TIMEOUT);
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216 /* Step 6: Set the refresh rate counter */
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217 /* Set the device refresh rate */
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218 HAL_SDRAM_ProgramRefreshRate(&sdramHandle, RefreshCount);
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222 * @brief Reads an amount of data from the SDRAM memory in polling mode.
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223 * @param uwStartAddress: Read start address
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224 * @param pData: Pointer to data to be read
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225 * @param uwDataSize: Size of read data from the memory
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226 * @retval SDRAM status
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228 uint8_t BSP_SDRAM_ReadData(uint32_t uwStartAddress, uint32_t *pData, uint32_t uwDataSize)
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230 if(HAL_SDRAM_Read_32b(&sdramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
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232 return SDRAM_ERROR;
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241 * @brief Reads an amount of data from the SDRAM memory in DMA mode.
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242 * @param uwStartAddress: Read start address
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243 * @param pData: Pointer to data to be read
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244 * @param uwDataSize: Size of read data from the memory
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245 * @retval SDRAM status
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247 uint8_t BSP_SDRAM_ReadData_DMA(uint32_t uwStartAddress, uint32_t *pData, uint32_t uwDataSize)
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249 if(HAL_SDRAM_Read_DMA(&sdramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
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251 return SDRAM_ERROR;
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260 * @brief Writes an amount of data to the SDRAM memory in polling mode.
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261 * @param uwStartAddress: Write start address
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262 * @param pData: Pointer to data to be written
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263 * @param uwDataSize: Size of written data from the memory
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264 * @retval SDRAM status
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266 uint8_t BSP_SDRAM_WriteData(uint32_t uwStartAddress, uint32_t *pData, uint32_t uwDataSize)
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268 if(HAL_SDRAM_Write_32b(&sdramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
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270 return SDRAM_ERROR;
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279 * @brief Writes an amount of data to the SDRAM memory in DMA mode.
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280 * @param uwStartAddress: Write start address
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281 * @param pData: Pointer to data to be written
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282 * @param uwDataSize: Size of written data from the memory
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283 * @retval SDRAM status
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285 uint8_t BSP_SDRAM_WriteData_DMA(uint32_t uwStartAddress, uint32_t *pData, uint32_t uwDataSize)
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287 if(HAL_SDRAM_Write_DMA(&sdramHandle, (uint32_t *)uwStartAddress, pData, uwDataSize) != HAL_OK)
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289 return SDRAM_ERROR;
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298 * @brief Sends command to the SDRAM bank.
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299 * @param SdramCmd: Pointer to SDRAM command structure
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300 * @retval SDRAM status
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302 uint8_t BSP_SDRAM_Sendcmd(FMC_SDRAM_CommandTypeDef *SdramCmd)
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304 if(HAL_SDRAM_SendCommand(&sdramHandle, SdramCmd, SDRAM_TIMEOUT) != HAL_OK)
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306 return SDRAM_ERROR;
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315 * @brief Initializes SDRAM MSP.
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316 * @param hsdram SDRAM handle
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317 * @param Params User parameters
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320 __weak void BSP_SDRAM_MspInit(SDRAM_HandleTypeDef *hsdram, void *Params)
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322 static MDMA_HandleTypeDef mdma_handle;
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323 GPIO_InitTypeDef gpio_init_structure;
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325 /* Enable FMC clock */
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326 __HAL_RCC_FMC_CLK_ENABLE();
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328 /* Enable chosen MDMAx clock */
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329 __MDMAx_CLK_ENABLE();
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331 /* Enable GPIOs clock */
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332 __HAL_RCC_GPIOD_CLK_ENABLE();
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333 __HAL_RCC_GPIOE_CLK_ENABLE();
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334 __HAL_RCC_GPIOF_CLK_ENABLE();
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335 __HAL_RCC_GPIOG_CLK_ENABLE();
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336 __HAL_RCC_GPIOH_CLK_ENABLE();
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338 /* Common GPIO configuration */
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339 gpio_init_structure.Mode = GPIO_MODE_AF_PP;
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340 gpio_init_structure.Pull = GPIO_PULLUP;
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341 gpio_init_structure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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342 gpio_init_structure.Alternate = GPIO_AF12_FMC;
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344 /* GPIOD configuration */
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345 gpio_init_structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_8| GPIO_PIN_9 | GPIO_PIN_10 |\
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346 GPIO_PIN_14 | GPIO_PIN_15;
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349 HAL_GPIO_Init(GPIOD, &gpio_init_structure);
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351 /* GPIOE configuration */
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352 gpio_init_structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_7| GPIO_PIN_8 | GPIO_PIN_9 |\
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353 GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 |\
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356 HAL_GPIO_Init(GPIOE, &gpio_init_structure);
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358 /* GPIOF configuration */
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359 gpio_init_structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2| GPIO_PIN_3 | GPIO_PIN_4 |\
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360 GPIO_PIN_5 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 |\
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363 HAL_GPIO_Init(GPIOF, &gpio_init_structure);
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365 /* GPIOG configuration */
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366 gpio_init_structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_8 | GPIO_PIN_15;
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367 HAL_GPIO_Init(GPIOG, &gpio_init_structure);
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369 /* GPIOH configuration */
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370 gpio_init_structure.Pin = GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7 ;
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371 HAL_GPIO_Init(GPIOH, &gpio_init_structure);
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375 /* Configure common MDMA parameters */
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376 mdma_handle.Init.Request = MDMA_REQUEST_SW;
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377 mdma_handle.Init.TransferTriggerMode = MDMA_BLOCK_TRANSFER;
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378 mdma_handle.Init.Priority = MDMA_PRIORITY_HIGH;
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379 mdma_handle.Init.Endianness = MDMA_LITTLE_ENDIANNESS_PRESERVE;
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380 mdma_handle.Init.SourceInc = MDMA_SRC_INC_WORD;
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381 mdma_handle.Init.DestinationInc = MDMA_DEST_INC_WORD;
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382 mdma_handle.Init.SourceDataSize = MDMA_SRC_DATASIZE_WORD;
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383 mdma_handle.Init.DestDataSize = MDMA_DEST_DATASIZE_WORD;
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384 mdma_handle.Init.DataAlignment = MDMA_DATAALIGN_PACKENABLE;
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385 mdma_handle.Init.SourceBurst = MDMA_SOURCE_BURST_SINGLE;
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386 mdma_handle.Init.DestBurst = MDMA_DEST_BURST_SINGLE;
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387 mdma_handle.Init.BufferTransferLength = 128;
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388 mdma_handle.Init.SourceBlockAddressOffset = 0;
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389 mdma_handle.Init.DestBlockAddressOffset = 0;
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392 mdma_handle.Instance = SDRAM_MDMAx_CHANNEL;
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394 /* Associate the DMA handle */
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395 __HAL_LINKDMA(hsdram, hmdma, mdma_handle);
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397 /* Deinitialize the stream for new transfer */
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398 HAL_MDMA_DeInit(&mdma_handle);
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400 /* Configure the DMA stream */
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401 HAL_MDMA_Init(&mdma_handle);
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403 /* NVIC configuration for DMA transfer complete interrupt */
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404 HAL_NVIC_SetPriority(SDRAM_MDMAx_IRQn, 0x0F, 0);
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405 HAL_NVIC_EnableIRQ(SDRAM_MDMAx_IRQn);
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409 * @brief DeInitializes SDRAM MSP.
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410 * @param hsdram SDRAM handle
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411 * @param Params User parameters
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414 __weak void BSP_SDRAM_MspDeInit(SDRAM_HandleTypeDef *hsdram, void *Params)
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416 static MDMA_HandleTypeDef mdma_handle;
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418 /* Disable NVIC configuration for DMA interrupt */
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419 HAL_NVIC_DisableIRQ(SDRAM_MDMAx_IRQn);
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421 /* Deinitialize the stream for new transfer */
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422 mdma_handle.Instance = SDRAM_MDMAx_CHANNEL;
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423 HAL_MDMA_DeInit(&mdma_handle);
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425 /* GPIO pins clock, FMC clock and MDMA clock can be shut down in the applications
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426 by surcharging this __weak function */
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445 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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