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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_STR75x_GCC/] [STLibrary/] [src/] [75x_smi.c] - Rev 584
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/******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** * File Name : 75x_smi.c * Author : MCD Application Team * Date First Issued : 03/10/2006 * Description : This file provides all the SMI software functions. ******************************************************************************** * History: * 07/17/2006 : V1.0 * 03/10/2006 : V0.1 ******************************************************************************** * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "75x_smi.h" /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* SMI_CR1 mask bits */ #define SMI_HOLDPRESCTCS_RESET_Mask 0xFF00800F #define SMI_Prescaler_MaxValue 0x7F #define SMI_DeselectTime_MaxValue 0x0F #define SMI_ClockHold_Mask 0x00 #define SMI_Prescaler_Mask 0x02 #define SMI_DeselectTime_Mask 0x5 /* SMI_CR2 mask bits */ #define SMI_BS_RESET_Mask 0xFFFFCFFF #define SMI_BS_Bank1_Mask 0x00001000 #define SMI_BS_Bank2_Mask 0x00002000 #define SMI_BS_Bank3_Mask 0x00003000 #define SMI_WEN_Mask 0x00000800 #define SMI_RSR_Mask 0x00000400 #define SMI_SEND_Mask 0x00000080 #define SMI_TRARECLENGTH_RESET_Mask 0xFFFFFF88 /* SMI_SR mask bits */ #define SMI_STATUSREGISTER_Mask 0xFF /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /******************************************************************************* * Function Name : SMI_DeInit * Description : Deinitializes the SMI peripheral registers to their default * reset values. This function must not be used when booting * from the SMI external memory. * Input : None * Output : None * Return : None *******************************************************************************/ void SMI_DeInit(void) { SMI->CR1 = 0x00000250; SMI->CR2 = 0x00; SMI->SR &= 0xFFFFF0FF; SMI->TR = 0x00; } /******************************************************************************* * Function Name : SMI_Init * Description : Initializes the SMI peripheral according to the specified * parameters in the SMI_InitStruct. * Input : - SMI_InitStruct: pointer to a SMI_InitTypeDef structure that * contains the configuration information for the specified * SMI peripheral. * Output : None * Return : None *******************************************************************************/ void SMI_Init(SMI_InitTypeDef* SMI_InitStruct) { u32 Temp = 0; /* Clear HOLD[7:0], PRESC[6:0] and TCS[3:0] bits */ Temp = SMI->CR1 & SMI_HOLDPRESCTCS_RESET_Mask; /* Set HOLD[7:0] bits according to SMI_ClockHold value */ Temp |= SMI_InitStruct->SMI_ClockHold << 16; if(SMI_InitStruct->SMI_Prescaler <= SMI_Prescaler_MaxValue) { /* Set PRESC[6:0] bits according to SMI_Prescaler value */ Temp |= SMI_InitStruct->SMI_Prescaler << 8; } if(SMI_InitStruct->SMI_DeselectTime <= SMI_DeselectTime_MaxValue) { /* Set TCS[3:0] bits according to SMI_DeselectTime value */ Temp |= SMI_InitStruct->SMI_DeselectTime << 4; } /* Store the new value */ SMI->CR1 = Temp; } /******************************************************************************* * Function Name : SMI_StructInit * Description : Fills each SMI_InitStruct member with its reset value. * Input : - SMI_InitStruct: pointer to a SMI_InitTypeDef structure which * will be initialized. * Output : None * Return : None *******************************************************************************/ void SMI_StructInit(SMI_InitTypeDef* SMI_InitStruct) { /* SMI_CK is sent continuously */ SMI_InitStruct->SMI_ClockHold = SMI_ClockHold_Mask; /* SMI_CK = HCLK/2 */ SMI_InitStruct->SMI_Prescaler = SMI_Prescaler_Mask; /* Deselect Time set to 6*SMI_CK periods */ SMI_InitStruct->SMI_DeselectTime = SMI_DeselectTime_Mask; } /******************************************************************************* * Function Name : SMI_ModeConfig * Description : Selects the SMI mode: hardware or software. * Input : - SMI_Mode: specifies the SMI mode. * This parameter can be one of the following values: * - SMI_Mode_HW: SMI in hardware mode * - SMI_Mode_SW: SMI in software mode * Output : None * Return : None *******************************************************************************/ void SMI_ModeConfig(u32 SMI_Mode) { if(SMI_Mode == SMI_Mode_SW) { SMI->CR1 |= SMI_Mode_SW; } else { SMI->CR1 &= SMI_Mode_HW; } } /******************************************************************************* * Function Name : SMI_TxRxLengthConfig * Description : Configures the number of bytes to be transmitted and received * to/from external memory. This function is used in Software * mode only. * Input : - SMI_TxLength: specifies the number of bytes to be transmitted * to external memory. * This parameter can be one of the following values: * - SMI_TxLength_0Bytes: No bytes transmitted * - SMI_TxLength_1Byte: 1 byte transmitted * - SMI_TxLength_2Bytes: 2 bytes transmitted * - SMI_TxLength_3Bytes: 3 bytes transmitted * - SMI_TxLength_4Bytes: 4 bytes transmitted * - SMI_RxLength: specifies the number of bytes to be received * from external memory. * This parameter can be one of the following values: * - SMI_RxLength_0Bytes: No bytes received * - SMI_RxLength_1Byte: 1 byte received * - SMI_RxLength_2Bytes: 2 bytes received * - SMI_RxLength_3Bytes: 3 bytes received * - SMI_RxLength_4Bytes: 4 bytes received * Output : None * Return : None *******************************************************************************/ void SMI_TxRxLengthConfig(u32 SMI_TxLength, u32 SMI_RxLength) { u32 Temp = 0; /* Clear TRA_LENGTH[2:0] and REC_LENGTH[2:0] bits */ Temp = SMI->CR2 & SMI_TRARECLENGTH_RESET_Mask; /* Set TRA_LENGTH[2:0] and REC_LENGTH[2:0] bits according to function parameters */ Temp |= SMI_TxLength | SMI_RxLength; /* Store the new value */ SMI->CR2 = Temp; } /******************************************************************************* * Function Name : SMI_BankCmd * Description : Enables or disables the specified memory Bank. * Input : - SMI_Bank: specifies the memory Bank to be enabled or disabled. * This parameter can be any combination of the following values: * - SMI_Bank_0 * - SMI_Bank_1 * - SMI_Bank_2 * - SMI_Bank_3 * - NewState: new state of the specified memory Bank. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void SMI_BankCmd(u32 SMI_Bank, FunctionalState NewState) { if(NewState == ENABLE) { SMI->CR1 |= SMI_Bank; } else { SMI->CR1 &= ~SMI_Bank; } } /******************************************************************************* * Function Name : SMI_ITConfig * Description : Enables or disables the specified SMI interrupts. * Input : - SMI_IT: specifies the SMI interrupts sources to be * enabled or disabled. This parameter can be any combination * of the following values: * - SMI_IT_WC : Write Complete Interrupt * - SMI_IT_TF : Transfer Finished Interrupt * - NewState: new state of the specified SMI interrupts. * This parameter can be: ENABLE or DISABLE. * Output : None * Return : None *******************************************************************************/ void SMI_ITConfig(u32 SMI_IT, FunctionalState NewState) { if(NewState == ENABLE) { SMI->CR2 |= SMI_IT; } else { SMI->CR2 &= ~SMI_IT; } } /******************************************************************************* * Function Name : SMI_SelectBank * Description : Selects the memory Bank to be accessed. Only one Bank can be * selected at a time. * Input : - SMI_Bank: specifies the memory Bank to be selected. * This parameter can be one of the following values: * - SMI_Bank_0 * - SMI_Bank_1 * - SMI_Bank_2 * - SMI_Bank_3 * Output : None * Return : None *******************************************************************************/ void SMI_SelectBank(u32 SMI_Bank) { /* Clear BS[1:0] bits (Bank0 is selected)*/ SMI->CR2 &= SMI_BS_RESET_Mask; switch(SMI_Bank) { case SMI_Bank_1: /* Select Bank1 */ SMI->CR2 |= SMI_BS_Bank1_Mask; break; case SMI_Bank_2: /* Select Bank2 */ SMI->CR2 |= SMI_BS_Bank2_Mask; break; case SMI_Bank_3: /* Select Bank3 */ SMI->CR2 |= SMI_BS_Bank3_Mask; break; default: break; } } /******************************************************************************* * Function Name : SMI_SendWENCmd * Description : Sends a Write Enable command to the selected memory Bank. * This function is used in Hardware mode only. * Input : None * Output : None * Return : None *******************************************************************************/ void SMI_SendWENCmd(void) { SMI->CR2 |= SMI_WEN_Mask; } /******************************************************************************* * Function Name : SMI_SendRSRCmd * Description : Sends a Read Status Register Command to the selected memory * Bank. * Input : None * Output : None * Return : None *******************************************************************************/ void SMI_SendRSRCmd(void) { SMI->CR2 |= SMI_RSR_Mask; } /******************************************************************************* * Function Name : SMI_SendCmd * Description : Sends command to the selected memory Bank. This function is * used in Software mode only. * Input : - Command: specifies the command to send to the external memory. * Output : None * Return : None *******************************************************************************/ void SMI_SendCmd(u32 Command) { /* Load the command in the Transmit Register */ SMI->TR = Command; /* Start transfer */ SMI->CR2 |= SMI_SEND_Mask; } /******************************************************************************* * Function Name : SMI_FastReadConfig * Description : Enables or disables the Fast Read Mode. * Input : - SMI_FastRead: specifies whether the Fast Read Mode is * enabled or disabled. * This parameter can be one of the following values: * - SMI_FastRead_Disable : Fast Read Mode disabled * - SMI_FastRead_Enable : Fast Read Mode enabled * Output : None * Return : None *******************************************************************************/ void SMI_FastReadConfig(u32 SMI_FastRead) { if(SMI_FastRead == SMI_FastRead_Enable) { SMI->CR1 |= SMI_FastRead_Enable; } else { SMI->CR1 &= SMI_FastRead_Disable; } } /******************************************************************************* * Function Name : SMI_WriteBurstConfig * Description : Enables or disables the Write Burst Mode. * Input : - SMI_WriteBurst: specifies whether the Write Burst Mode is * enabled or disabled. * This parameter can be one of the following values: * - SMI_WriteBurst_Disable : Write Burst Mode disabled * - SMI_WriteBurst_Enable : Write Burst Mode enabled * Output : None * Return : None *******************************************************************************/ void SMI_WriteBurstConfig(u32 SMI_WriteBurst) { if(SMI_WriteBurst == SMI_WriteBurst_Enable) { SMI->CR1 |= SMI_WriteBurst_Enable; } else { SMI->CR1 &= SMI_WriteBurst_Disable; } } /******************************************************************************* * Function Name : SMI_WriteByte * Description : Writes a Byte to the selected memory Bank. This function is * used in Hardware mode only. * Before calling this function, send a Write Enable command to * the selected memory Bank using SMI_SendWENCmd() function. * Input : - WriteAddr: external memory address from which the data will * be written. * - Data: data to be written to the external memory. * Output : None * Return : None *******************************************************************************/ void SMI_WriteByte(u32 WriteAddr, u8 Data) { /* Transfer data to the memory */ *(u8 *) WriteAddr = Data; } /******************************************************************************* * Function Name : SMI_WriteHalfWord * Description : Writes a Half Word to the selected memory Bank. This function * is used in Hardware mode only. * Before calling this function, send a Write Enable command to * the selected memory Bank using SMI_SendWENCmd() function. * Input : - WriteAddr: external memory address from which the data will * be written. * - Data: data to be written to the external memory. * Output : None * Return : None *******************************************************************************/ void SMI_WriteHalfWord(u32 WriteAddr, u16 Data) { /* Transfer data to the memory */ *(u16 *) WriteAddr = Data; } /******************************************************************************* * Function Name : SMI_WriteWord * Description : Writes a Word to the selected memory Bank. This function is * used in Hardware mode only. * Before calling this function, send a Write Enable command to * the selected memory Bank using SMI_SendWENCmd() function. * Input : - WriteAddr: external memory address from which the data will * be written. * - Data: data to be written to the external memory. * Output : None * Return : None *******************************************************************************/ void SMI_WriteWord(u32 WriteAddr, u32 Data) { /* Transfer data to the memory */ *(u32 *) WriteAddr = Data; } /******************************************************************************* * Function Name : SMI_ReadByte * Description : Reads a Byte from the selected memory Bank. This function is * used in Hardware mode only. * Input : - ReadAddr: external memory address to read from. * Output : None * Return : Data read from the external memory. *******************************************************************************/ u8 SMI_ReadByte(u32 ReadAddr) { return(*(u8 *) ReadAddr); } /******************************************************************************* * Function Name : SMI_ReadHalfWord * Description : Reads a Half Word from the selected memory Bank. This function * is used in Hardware mode only. * Input : - ReadAddr: external memory address to read from. * Output : None * Return : Data read from the external memory. *******************************************************************************/ u16 SMI_ReadHalfWord(u32 ReadAddr) { return(*(u16 *) ReadAddr); } /******************************************************************************* * Function Name : SMI_ReadWord * Description : Reads a Word from the selected memory Bank. This function is * used in Hardware mode only. * Input : - ReadAddr: external memory address to read from. * Output : None * Return : Data read from the external memory. *******************************************************************************/ u32 SMI_ReadWord(u32 ReadAddr) { return(*(u32 *) ReadAddr); } /******************************************************************************* * Function Name : SMI_ReadMemoryStatusRegister * Description : Reads the status register of the memory connected to the * selected Bank. * Input : None * Output : None * Return : External memory status register value. *******************************************************************************/ u8 SMI_ReadMemoryStatusRegister(void) { return((u8) (SMI->SR & SMI_STATUSREGISTER_Mask)); } /******************************************************************************* * Function Name : SMI_GetFlagStatus * Description : Checks whether the specified SMI flag is set or not. * Input : - SMI_FLAG: specifies the flag to check. * This parameter can be one of the following values: * - SMI_FLAG_Bank3_WM : Memory Bank3 Write Mode flag * - SMI_FLAG_Bank2_WM : Memory Bank2 Write Mode flag * - SMI_FLAG_Bank1_WM : Memory Bank1 Write Mode flag * - SMI_FLAG_Bank0_WM : Memory Bank0 Write Mode flag * - SMI_FLAG_ERF2 : Error Flag 2: Forbidden Write Request * - SMI_FLAG_ERF1 : Error Flag 1: Forbidden Access * - SMI_FLAG_WC : Write Complete flag * - SMI_FLAG_TF : Transfer Finished flag * Output : None * Return : The new state of SMI_FLAG (SET or RESET). *******************************************************************************/ FlagStatus SMI_GetFlagStatus(u32 SMI_FLAG) { if((SMI->SR & SMI_FLAG) != RESET) { return SET; } else { return RESET; } } /******************************************************************************* * Function Name : SMI_ClearFlag * Description : Clears the SMI’s pending flags. * Input : - SMI_FLAG: specifies the flag to clear. * This parameter can be any combination of the following values: * - SMI_FLAG_ERF2 : Error Flag 2: Forbidden Write Request * - SMI_FLAG_ERF1 : Error Flag 1: Forbidden Access * - SMI_FLAG_WC : Write Complete flag * - SMI_FLAG_TF : Transfer Finished flag * Output : None * Return : None *******************************************************************************/ void SMI_ClearFlag(u32 SMI_FLAG) { SMI->SR &= ~SMI_FLAG; } /******************************************************************************* * Function Name : SMI_GetITStatus * Description : Checks whether the specified SMI interrupt has occurred or not. * Input : - SMI_FLAG: specifies the interrupt source to check. * This parameter can be one of the following values: * - SMI_IT_WC : Write Complete Interrupt * - SMI_IT_TF : Transfer Finished Interrupt * Output : None * Return : The new state of SMI_IT (SET or RESET). *******************************************************************************/ ITStatus SMI_GetITStatus(u32 SMI_IT) { if(((SMI->CR2 & SMI_IT) != RESET) && ((SMI->SR & SMI_IT) != RESET)) { return SET; } else { return RESET; } } /******************************************************************************* * Function Name : SMI_ClearITPendingBit * Description : Clears the SMI’s interrupt pending bits. * Input : - SMI_FLAG: specifies the interrupts sources to clear. * This parameter can be any combination of the following values: * - SMI_IT_WC : Write Complete Interrupt * - SMI_IT_TF : Transfer Finished Interrupt * Output : None * Return : None *******************************************************************************/ void SMI_ClearITPendingBit(u32 SMI_IT) { SMI->SR &= ~SMI_IT; } /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/
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