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| 1 | ingob | 1 | /******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** |
| 2 | * File Name : 91x_emi.c |
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| 3 | * Author : MCD Application Team |
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| 4 | * Date First Issued : 05/18/2006 : Version 1.0 |
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| 5 | * Description : This file provides all the EMI software functions. |
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| 6 | ******************************************************************************** |
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| 7 | * History: |
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| 8 | * 05/22/2007 : Version 1.2 |
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| 9 | * 05/24/2006 : Version 1.1 |
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| 10 | * 05/18/2006 : Version 1.0 |
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| 11 | ******************************************************************************** |
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| 12 | * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS |
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| 13 | * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. |
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| 14 | * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, |
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| 15 | * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE |
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| 16 | * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING |
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| 17 | * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. |
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| 18 | *******************************************************************************/ |
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| 19 | |||
| 20 | /* Includes ------------------------------------------------------------------*/ |
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| 21 | #include "91x_emi.h" |
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| 22 | #include "91x_scu.h" |
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| 23 | /* Private typedef -----------------------------------------------------------*/ |
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| 24 | /* Private define ------------------------------------------------------------*/ |
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| 25 | |||
| 26 | /* These constant variables are used as masks to handle the EMI registers. */ |
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| 27 | |||
| 28 | #define EMI_PageModeRead_TL_Mask 0xFFFFF3FF |
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| 29 | #define EMI_PageModeRead_Sel_Mask 0xFFFFFEFF |
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| 30 | #define EMI_MemWidth_Mask 0xFFFFFFCF |
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| 31 | #define EMI_WriteProtect_Mask 0xFFFFFEF7 |
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| 32 | |||
| 33 | |||
| 34 | /* Private macro -------------------------------------------------------------*/ |
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| 35 | /* Private variables ---------------------------------------------------------*/ |
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| 36 | /* Registers reset value */ |
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| 37 | /* Private function prototypes -----------------------------------------------*/ |
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| 38 | /* Private functions ---------------------------------------------------------*/ |
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| 39 | |||
| 40 | /****************************************************************************** |
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| 41 | * Function Name : EMI_DeInit |
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| 42 | * Description : Deinitializes the EMI peripheral registers to their default |
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| 43 | * reset values. |
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| 44 | * Input : None |
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| 45 | * Output : None |
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| 46 | * Return : None |
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| 47 | *******************************************************************************/ |
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| 48 | |||
| 49 | void EMI_DeInit(void) |
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| 50 | { |
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| 51 | |||
| 52 | SCU_AHBPeriphReset(__EMI, ENABLE); /* EMI peripheral under Reset */ |
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| 53 | SCU_AHBPeriphReset(__EMI,DISABLE ); /* EMI not under Reset */ |
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| 54 | |||
| 55 | } |
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| 56 | |||
| 57 | /******************************************************************************* |
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| 58 | * Function Name : EMI_StructInit |
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| 59 | * Description : Fills the EMI_InitTypeDef structure member with its reset |
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| 60 | * value. |
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| 61 | * Input : EMI_InitStruct : pointer to a EMI_InitTypeDef structure |
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| 62 | * which will be initialized. |
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| 63 | * Output : None |
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| 64 | * Return : None |
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| 65 | *******************************************************************************/ |
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| 66 | |||
| 67 | void EMI_StructInit( EMI_InitTypeDef *EMI_InitStruct) |
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| 68 | { |
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| 69 | |||
| 70 | /* Number of bus turnaround cycles added between read and write accesses.*/ |
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| 71 | /*This member can be 0x01,0x02,0x03, ....0xF (Reset value:0xF "15 cycles"*/ |
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| 72 | |||
| 73 | EMI_InitStruct->EMI_Bank_IDCY =0xF; |
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| 74 | |||
| 75 | |||
| 76 | /* Number of wait states for read accesses*/ |
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| 77 | /*This member can be: 0x01,0x02,0x03, ....0x1F (Reset value:0x1F "31 cycles"*/ |
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| 78 | |||
| 79 | EMI_InitStruct->EMI_Bank_WSTRD =0x1F; |
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| 80 | |||
| 81 | |||
| 82 | /* Number of wait states for write accesses*/ |
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| 83 | /*This member can be: 0x01,0x02,0x03, ....0x1F (Reset value:0x1F "31 cycles"*/ |
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| 84 | |||
| 85 | EMI_InitStruct->EMI_Bank_WSTWR =0x1F; |
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| 86 | |||
| 87 | /*Output enable assertion delay from chip select assertion*/ |
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| 88 | /*This member can be: 0x01,0x02,0x03, ....0xF (Reset value:0x01 "1 cycle"*/ |
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| 89 | |||
| 90 | EMI_InitStruct->EMI_Bank_WSTROEN =0x01; |
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| 91 | |||
| 92 | |||
| 93 | /*Write enable assertion delay from chip select assertion*/ |
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| 94 | /*This member can be: 0x01,0x02,0x03, ....0xF (Reset value:0x00 "0 cycle"*/ |
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| 95 | |||
| 96 | EMI_InitStruct->EMI_Bank_WSTWEN =0x00; |
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| 97 | |||
| 98 | |||
| 99 | /*This member Controls the memory width*/ |
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| 100 | /*This member can be :"EMI_Width_Byte" = 8 bits width or "EMI_Width_HalfWord" = 16 bits width*/ |
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| 101 | |||
| 102 | EMI_InitStruct->EMI_Bank_MemWidth = EMI_Width_Byte; |
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| 103 | |||
| 104 | |||
| 105 | /*Write protection feature */ |
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| 106 | /*This member can be :"EMI_Bank_NonWriteProtect" = No write protection or "EMI_Bank_WriteProtect" = bank is write protected*/ |
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| 107 | |||
| 108 | EMI_InitStruct-> EMI_Bank_WriteProtection= EMI_Bank_NonWriteProtect; |
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| 109 | |||
| 110 | |||
| 111 | /* page transfer length for page mode read */ |
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| 112 | /*This member can be :"EMI_4Data" = 4 transfers burst or "EMI_8Data" = 8 transfers burst*/ |
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| 113 | |||
| 114 | EMI_InitStruct->EMI_PageModeRead_TransferLength= EMI_4Data; |
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| 115 | |||
| 116 | /*Select or deselect the page mode read*/ |
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| 117 | /*This member can be :"EMI_NormalMode" =Normal Mode or "EMI_PageModeRead" = Page Mode Read*/ |
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| 118 | |||
| 119 | EMI_InitStruct->EMI_PageModeRead_Selection = EMI_NormalMode; |
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| 120 | |||
| 121 | |||
| 122 | } |
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| 123 | |||
| 124 | /******************************************************************************* |
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| 125 | * Function Name : EMI_Init |
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| 126 | * Description : Initializes EMI peripheral according to the specified |
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| 127 | * parameters in the EMI_InitStruct. |
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| 128 | |||
| 129 | * Input : EMI_Bankx:where x can be 0,1,2 or 3 to select the EMI Bank. |
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| 130 | EMI_InitStruct: pointer to a EMI_InitTypeDef structure |
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| 131 | ( Structure Config to be loaded in EMI Registers). . |
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| 132 | |||
| 133 | * Output : None |
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| 134 | * Return : None |
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| 135 | *******************************************************************************/ |
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| 136 | |||
| 137 | void EMI_Init( EMI_Bank_TypeDef* EMI_Bankx, EMI_InitTypeDef* EMI_InitStruct) |
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| 138 | |||
| 139 | { |
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| 140 | |||
| 141 | EMI_Bankx->ICR = EMI_InitStruct-> EMI_Bank_IDCY ; |
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| 142 | |||
| 143 | EMI_Bankx->RCR = EMI_InitStruct->EMI_Bank_WSTRD ; |
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| 144 | |||
| 145 | EMI_Bankx->WCR = EMI_InitStruct->EMI_Bank_WSTWR ; |
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| 146 | |||
| 147 | EMI_Bankx->OECR = EMI_InitStruct->EMI_Bank_WSTROEN; |
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| 148 | |||
| 149 | EMI_Bankx->WECR = EMI_InitStruct->EMI_Bank_WSTWEN ; |
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| 150 | |||
| 151 | EMI_Bankx->BCR &= EMI_MemWidth_Mask; |
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| 152 | EMI_Bankx->BCR |= EMI_InitStruct->EMI_Bank_MemWidth; |
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| 153 | |||
| 154 | EMI_Bankx->BCR &= EMI_WriteProtect_Mask; |
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| 155 | EMI_Bankx->BCR |= EMI_InitStruct->EMI_Bank_WriteProtection; |
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| 156 | |||
| 157 | EMI_Bankx->BCR &= EMI_PageModeRead_TL_Mask; |
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| 158 | EMI_Bankx->BCR |= EMI_InitStruct->EMI_PageModeRead_TransferLength; |
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| 159 | |||
| 160 | EMI_Bankx->BCR &= EMI_PageModeRead_Sel_Mask; |
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| 161 | EMI_Bankx->BCR |= EMI_InitStruct->EMI_PageModeRead_Selection; |
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| 162 | |||
| 163 | |||
| 164 | } |
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| 165 | |||
| 166 | |||
| 167 | |||
| 168 | /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/ |