/** ****************************************************************************** * @file stm32f10x_cec.c * @author MCD Application Team * @version V3.5.0 * @date 11-March-2011 * @brief This file provides all the CEC firmware functions. ****************************************************************************** * @attention * * THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. * *

© COPYRIGHT 2011 STMicroelectronics

****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32f10x_cec.h" #include "stm32f10x_rcc.h" /** @addtogroup STM32F10x_StdPeriph_Driver * @{ */ /** @defgroup CEC * @brief CEC driver modules * @{ */ /** @defgroup CEC_Private_TypesDefinitions * @{ */ /** * @} */ /** @defgroup CEC_Private_Defines * @{ */ /* ------------ CEC registers bit address in the alias region ----------- */ #define CEC_OFFSET (CEC_BASE - PERIPH_BASE) /* --- CFGR Register ---*/ /* Alias word address of PE bit */ #define CFGR_OFFSET (CEC_OFFSET + 0x00) #define PE_BitNumber 0x00 #define CFGR_PE_BB (PERIPH_BB_BASE + (CFGR_OFFSET * 32) + (PE_BitNumber * 4)) /* Alias word address of IE bit */ #define IE_BitNumber 0x01 #define CFGR_IE_BB (PERIPH_BB_BASE + (CFGR_OFFSET * 32) + (IE_BitNumber * 4)) /* --- CSR Register ---*/ /* Alias word address of TSOM bit */ #define CSR_OFFSET (CEC_OFFSET + 0x10) #define TSOM_BitNumber 0x00 #define CSR_TSOM_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (TSOM_BitNumber * 4)) /* Alias word address of TEOM bit */ #define TEOM_BitNumber 0x01 #define CSR_TEOM_BB (PERIPH_BB_BASE + (CSR_OFFSET * 32) + (TEOM_BitNumber * 4)) #define CFGR_CLEAR_Mask (uint8_t)(0xF3) /* CFGR register Mask */ #define FLAG_Mask ((uint32_t)0x00FFFFFF) /* CEC FLAG mask */ /** * @} */ /** @defgroup CEC_Private_Macros * @{ */ /** * @} */ /** @defgroup CEC_Private_Variables * @{ */ /** * @} */ /** @defgroup CEC_Private_FunctionPrototypes * @{ */ /** * @} */ /** @defgroup CEC_Private_Functions * @{ */ /** * @brief Deinitializes the CEC peripheral registers to their default reset * values. * @param None * @retval None */ void CEC_DeInit(void) { /* Enable CEC reset state */ RCC_APB1PeriphResetCmd(RCC_APB1Periph_CEC, ENABLE); /* Release CEC from reset state */ RCC_APB1PeriphResetCmd(RCC_APB1Periph_CEC, DISABLE); } /** * @brief Initializes the CEC peripheral according to the specified * parameters in the CEC_InitStruct. * @param CEC_InitStruct: pointer to an CEC_InitTypeDef structure that * contains the configuration information for the specified * CEC peripheral. * @retval None */ void CEC_Init(CEC_InitTypeDef* CEC_InitStruct) { uint16_t tmpreg = 0; /* Check the parameters */ assert_param(IS_CEC_BIT_TIMING_ERROR_MODE(CEC_InitStruct->CEC_BitTimingMode)); assert_param(IS_CEC_BIT_PERIOD_ERROR_MODE(CEC_InitStruct->CEC_BitPeriodMode)); /*---------------------------- CEC CFGR Configuration -----------------*/ /* Get the CEC CFGR value */ tmpreg = CEC->CFGR; /* Clear BTEM and BPEM bits */ tmpreg &= CFGR_CLEAR_Mask; /* Configure CEC: Bit Timing Error and Bit Period Error */ tmpreg |= (uint16_t)(CEC_InitStruct->CEC_BitTimingMode | CEC_InitStruct->CEC_BitPeriodMode); /* Write to CEC CFGR register*/ CEC->CFGR = tmpreg; } /** * @brief Enables or disables the specified CEC peripheral. * @param NewState: new state of the CEC peripheral. * This parameter can be: ENABLE or DISABLE. * @retval None */ void CEC_Cmd(FunctionalState NewState) { /* Check the parameters */ assert_param(IS_FUNCTIONAL_STATE(NewState)); *(__IO uint32_t *) CFGR_PE_BB = (uint32_t)NewState; if(NewState == DISABLE) { /* Wait until the PE bit is cleared by hardware (Idle Line detected) */ while((CEC->CFGR & CEC_CFGR_PE) != (uint32_t)RESET) { } } } /** * @brief Enables or disables the CEC interrupt. * @param NewState: new state of the CEC interrupt. * This parameter can be: ENABLE or DISABLE. * @retval None */ void CEC_ITConfig(FunctionalState NewState) { /* Check the parameters */ assert_param(IS_FUNCTIONAL_STATE(NewState)); *(__IO uint32_t *) CFGR_IE_BB = (uint32_t)NewState; } /** * @brief Defines the Own Address of the CEC device. * @param CEC_OwnAddress: The CEC own address * @retval None */ void CEC_OwnAddressConfig(uint8_t CEC_OwnAddress) { /* Check the parameters */ assert_param(IS_CEC_ADDRESS(CEC_OwnAddress)); /* Set the CEC own address */ CEC->OAR = CEC_OwnAddress; } /** * @brief Sets the CEC prescaler value. * @param CEC_Prescaler: CEC prescaler new value * @retval None */ void CEC_SetPrescaler(uint16_t CEC_Prescaler) { /* Check the parameters */ assert_param(IS_CEC_PRESCALER(CEC_Prescaler)); /* Set the Prescaler value*/ CEC->PRES = CEC_Prescaler; } /** * @brief Transmits single data through the CEC peripheral. * @param Data: the data to transmit. * @retval None */ void CEC_SendDataByte(uint8_t Data) { /* Transmit Data */ CEC->TXD = Data ; } /** * @brief Returns the most recent received data by the CEC peripheral. * @param None * @retval The received data. */ uint8_t CEC_ReceiveDataByte(void) { /* Receive Data */ return (uint8_t)(CEC->RXD); } /** * @brief Starts a new message. * @param None * @retval None */ void CEC_StartOfMessage(void) { /* Starts of new message */ *(__IO uint32_t *) CSR_TSOM_BB = (uint32_t)0x1; } /** * @brief Transmits message with or without an EOM bit. * @param NewState: new state of the CEC Tx End Of Message. * This parameter can be: ENABLE or DISABLE. * @retval None */ void CEC_EndOfMessageCmd(FunctionalState NewState) { /* Check the parameters */ assert_param(IS_FUNCTIONAL_STATE(NewState)); /* The data byte will be transmitted with or without an EOM bit*/ *(__IO uint32_t *) CSR_TEOM_BB = (uint32_t)NewState; } /** * @brief Gets the CEC flag status * @param CEC_FLAG: specifies the CEC flag to check. * This parameter can be one of the following values: * @arg CEC_FLAG_BTE: Bit Timing Error * @arg CEC_FLAG_BPE: Bit Period Error * @arg CEC_FLAG_RBTFE: Rx Block Transfer Finished Error * @arg CEC_FLAG_SBE: Start Bit Error * @arg CEC_FLAG_ACKE: Block Acknowledge Error * @arg CEC_FLAG_LINE: Line Error * @arg CEC_FLAG_TBTFE: Tx Block Transfer Finished Error * @arg CEC_FLAG_TEOM: Tx End Of Message * @arg CEC_FLAG_TERR: Tx Error * @arg CEC_FLAG_TBTRF: Tx Byte Transfer Request or Block Transfer Finished * @arg CEC_FLAG_RSOM: Rx Start Of Message * @arg CEC_FLAG_REOM: Rx End Of Message * @arg CEC_FLAG_RERR: Rx Error * @arg CEC_FLAG_RBTF: Rx Byte/Block Transfer Finished * @retval The new state of CEC_FLAG (SET or RESET) */ FlagStatus CEC_GetFlagStatus(uint32_t CEC_FLAG) { FlagStatus bitstatus = RESET; uint32_t cecreg = 0, cecbase = 0; /* Check the parameters */ assert_param(IS_CEC_GET_FLAG(CEC_FLAG)); /* Get the CEC peripheral base address */ cecbase = (uint32_t)(CEC_BASE); /* Read flag register index */ cecreg = CEC_FLAG >> 28; /* Get bit[23:0] of the flag */ CEC_FLAG &= FLAG_Mask; if(cecreg != 0) { /* Flag in CEC ESR Register */ CEC_FLAG = (uint32_t)(CEC_FLAG >> 16); /* Get the CEC ESR register address */ cecbase += 0xC; } else { /* Get the CEC CSR register address */ cecbase += 0x10; } if(((*(__IO uint32_t *)cecbase) & CEC_FLAG) != (uint32_t)RESET) { /* CEC_FLAG is set */ bitstatus = SET; } else { /* CEC_FLAG is reset */ bitstatus = RESET; } /* Return the CEC_FLAG status */ return bitstatus; } /** * @brief Clears the CEC's pending flags. * @param CEC_FLAG: specifies the flag to clear. * This parameter can be any combination of the following values: * @arg CEC_FLAG_TERR: Tx Error * @arg CEC_FLAG_TBTRF: Tx Byte Transfer Request or Block Transfer Finished * @arg CEC_FLAG_RSOM: Rx Start Of Message * @arg CEC_FLAG_REOM: Rx End Of Message * @arg CEC_FLAG_RERR: Rx Error * @arg CEC_FLAG_RBTF: Rx Byte/Block Transfer Finished * @retval None */ void CEC_ClearFlag(uint32_t CEC_FLAG) { uint32_t tmp = 0x0; /* Check the parameters */ assert_param(IS_CEC_CLEAR_FLAG(CEC_FLAG)); tmp = CEC->CSR & 0x2; /* Clear the selected CEC flags */ CEC->CSR &= (uint32_t)(((~(uint32_t)CEC_FLAG) & 0xFFFFFFFC) | tmp); } /** * @brief Checks whether the specified CEC interrupt has occurred or not. * @param CEC_IT: specifies the CEC interrupt source to check. * This parameter can be one of the following values: * @arg CEC_IT_TERR: Tx Error * @arg CEC_IT_TBTF: Tx Block Transfer Finished * @arg CEC_IT_RERR: Rx Error * @arg CEC_IT_RBTF: Rx Block Transfer Finished * @retval The new state of CEC_IT (SET or RESET). */ ITStatus CEC_GetITStatus(uint8_t CEC_IT) { ITStatus bitstatus = RESET; uint32_t enablestatus = 0; /* Check the parameters */ assert_param(IS_CEC_GET_IT(CEC_IT)); /* Get the CEC IT enable bit status */ enablestatus = (CEC->CFGR & (uint8_t)CEC_CFGR_IE) ; /* Check the status of the specified CEC interrupt */ if (((CEC->CSR & CEC_IT) != (uint32_t)RESET) && enablestatus) { /* CEC_IT is set */ bitstatus = SET; } else { /* CEC_IT is reset */ bitstatus = RESET; } /* Return the CEC_IT status */ return bitstatus; } /** * @brief Clears the CEC's interrupt pending bits. * @param CEC_IT: specifies the CEC interrupt pending bit to clear. * This parameter can be any combination of the following values: * @arg CEC_IT_TERR: Tx Error * @arg CEC_IT_TBTF: Tx Block Transfer Finished * @arg CEC_IT_RERR: Rx Error * @arg CEC_IT_RBTF: Rx Block Transfer Finished * @retval None */ void CEC_ClearITPendingBit(uint16_t CEC_IT) { uint32_t tmp = 0x0; /* Check the parameters */ assert_param(IS_CEC_GET_IT(CEC_IT)); tmp = CEC->CSR & 0x2; /* Clear the selected CEC interrupt pending bits */ CEC->CSR &= (uint32_t)(((~(uint32_t)CEC_IT) & 0xFFFFFFFC) | tmp); } /** * @} */ /** * @} */ /** * @} */ /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/