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pigweed / third_party / github / FreeRTOS / FreeRTOS-Kernel / 9c0c37ab9b56f2c90085b78df2f58b5833e473db / . / FreeRTOS / Demo / Common / drivers / ST / STM32F10xFWLib / src / stm32f10x_usart.c
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/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name : stm32f10x_usart.c
* Author : MCD Application Team
* Date First Issued : 09/29/2006
* Description : This file provides all the USART firmware functions.
********************************************************************************
* History:
* 04/02/2007: V0.2
* 02/05/2007: V0.1
* 09/29/2006: V0.01
********************************************************************************
* 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 "stm32f10x_usart.h"
#include "stm32f10x_rcc.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* USART RUN Mask */
#define CR1_RUN_Set ((u16)0x2000) /* USART Enable Mask */
#define CR1_RUN_Reset ((u16)0xDFFF) /* USART Disable Mask */
#define CR2_Address_Mask ((u16)0xFFF0) /* USART address Mask */
/* USART RWU Mask */
#define CR1_RWU_Set ((u16)0x0002) /* USART mute mode Enable Mask */
#define CR1_RWU_Reset ((u16)0xFFFD) /* USART mute mode Enable Mask */
#define USART_IT_Mask ((u16)0x001F) /* USART Interrupt Mask */
/* USART LIN Mask */
#define CR2_LINE_Set ((u16)0x4000) /* USART LIN Enable Mask */
#define CR2_LINE_Reset ((u16)0xBFFF) /* USART LIN Disable Mask */
#define CR1_SBK_Set ((u16)0x0001) /* USART Break Character send Mask */
/* USART SC Mask */
#define CR3_SCEN_Set ((u16)0x0020) /* USART SC Enable Mask */
#define CR3_SCEN_Reset ((u16)0xFFDF) /* USART SC Disable Mask */
/* USART SC NACK Mask */
#define CR3_NACK_Set ((u16)0x0010) /* USART SC NACK Enable Mask */
#define CR3_NACK_Reset ((u16)0xFFEF) /* USART SC NACK Disable Mask */
/* USART Half-Duplex Mask */
#define CR3_HDSEL_Set ((u16)0x0008) /* USART Half-Duplex Enable Mask */
#define CR3_HDSEL_Reset ((u16)0xFFF7) /* USART Half-Duplex Disable Mask */
/* USART IrDA Mask */
#define CR3_IRLP_Mask ((u16)0xFFFB) /* USART IrDA LowPower mode Mask */
/* USART LIN Break detection */
#define CR3_LBDL_Mask ((u16)0xFFDF) /* USART LIN Break detection Mask */
/* USART WakeUp Method */
#define CR3_WAKE_Mask ((u16)0xF7FF) /* USART WakeUp Method Mask */
/* USART IrDA Mask */
#define CR3_IREN_Set ((u16)0x0002) /* USART IrDA Enable Mask */
#define CR3_IREN_Reset ((u16)0xFFFD) /* USART IrDA Disable Mask */
#define GTPR_LSB_Mask ((u16)0x00FF) /* Guard Time Register LSB Mask */
#define GTPR_MSB_Mask ((u16)0xFF00) /* Guard Time Register MSB Mask */
#define CR1_CLEAR_Mask ((u16)0xE9F3) /* USART CR1 Mask */
#define CR2_CLEAR_Mask ((u16)0xC0FF) /* USART CR2 Mask */
#define CR3_CLEAR_Mask ((u16)0xFCFF) /* USART CR3 Mask */
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : USART_DeInit
* Description : Deinitializes the USARTx peripheral registers to their
* default reset values.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_DeInit(USART_TypeDef* USARTx)
{
switch (*(u32*)&USARTx)
{
case USART1_BASE:
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
break;
case USART2_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
break;
case USART3_BASE:
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
break;
default:
break;
}
}
/*******************************************************************************
* Function Name : USART_Init
* Description : Initializes the USARTx peripheral according to the specified
* parameters in the USART_InitStruct .
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART peripheral.
* - USART_InitStruct: pointer to a USART_InitTypeDef structure
* that contains the configuration information for the
* specified USART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
{
u32 tmpreg = 0x00, apbclock = 0x00;
u32 integerdivider = 0x00;
u32 fractionaldivider = 0x00;
RCC_ClocksTypeDef RCC_ClocksStatus;
/* Check the parameters */
assert(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
assert(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
assert(IS_USART_PARITY(USART_InitStruct->USART_Parity));
assert(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
assert(IS_USART_MODE(USART_InitStruct->USART_Mode));
assert(IS_USART_CLOCK(USART_InitStruct->USART_Clock));
assert(IS_USART_CPOL(USART_InitStruct->USART_CPOL));
assert(IS_USART_CPHA(USART_InitStruct->USART_CPHA));
assert(IS_USART_LASTBIT(USART_InitStruct->USART_LastBit));
/*---------------------------- USART CR2 Configuration -----------------------*/
tmpreg = USARTx->CR2;
/* Clear STOP[13:12], CLKEN, CPOL, CPHA and LBCL bits */
tmpreg &= CR2_CLEAR_Mask;
/* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
/* Set STOP[13:12] bits according to USART_Mode value */
/* Set CPOL bit according to USART_CPOL value */
/* Set CPHA bit according to USART_CPHA value */
/* Set LBCL bit according to USART_LastBit value */
tmpreg |= (u32)USART_InitStruct->USART_StopBits | USART_InitStruct->USART_Clock |
USART_InitStruct->USART_CPOL | USART_InitStruct->USART_CPHA |
USART_InitStruct->USART_LastBit;
/* Write to USART CR2 */
USARTx->CR2 = (u16)tmpreg;
/*---------------------------- USART CR1 Configuration -----------------------*/
tmpreg = 0x00;
tmpreg = USARTx->CR1;
/* Clear M, PCE, PS, TE and RE bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure the USART Word Length, Parity and mode ----------------------- */
/* Set the M bits according to USART_WordLength value */
/* Set PCE and PS bits according to USART_Parity value */
/* Set TE and RE bits according to USART_Mode value */
tmpreg |= (u32)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
USART_InitStruct->USART_Mode;
/* Write to USART CR1 */
USARTx->CR1 = (u16)tmpreg;
/*---------------------------- USART CR3 Configuration -----------------------*/
tmpreg = 0x00;
tmpreg = USARTx->CR3;
/* Clear CTSE and RTSE bits */
tmpreg &= CR3_CLEAR_Mask;
/* Configure the USART HFC -------------------------------------------------*/
/* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
/* Write to USART CR3 */
USARTx->CR3 = (u16)tmpreg;
/*---------------------------- USART BRR Configuration -----------------------*/
tmpreg = 0x00;
/* Configure the USART Baud Rate -------------------------------------------*/
RCC_GetClocksFreq(&RCC_ClocksStatus);
if ((*(u32*)&USARTx) == USART1_BASE)
{
apbclock = RCC_ClocksStatus.PCLK2_Frequency;
}
else
{
apbclock = RCC_ClocksStatus.PCLK1_Frequency;
}
/* Determine the integer part */
integerdivider = ((0x19 * apbclock) / (0x04 * (USART_InitStruct->USART_BaudRate)));
tmpreg = (integerdivider / 0x64) << 0x04;
/* Determine the fractional part */
fractionaldivider = integerdivider - (0x64 * (tmpreg >> 0x04));
tmpreg |= ((((fractionaldivider * 0x10) + 0x32) / 0x64)) & ((u8)0x0F);
/* Write to USART BRR */
USARTx->BRR = (u16)tmpreg;
}
/*******************************************************************************
* Function Name : USART_StructInit
* Description : Fills each USART_InitStruct member with its default value.
* Input : - USART_InitStruct: pointer to a USART_InitTypeDef structure
* which will be initialized.
* Output : None
* Return : None
*******************************************************************************/
void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
{
/* USART_InitStruct members default value */
USART_InitStruct->USART_BaudRate = 0x2580; /* 9600 Baud */
USART_InitStruct->USART_WordLength = USART_WordLength_8b;
USART_InitStruct->USART_StopBits = USART_StopBits_1;
USART_InitStruct->USART_Parity = USART_Parity_No ;
USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStruct->USART_Clock = USART_Clock_Disable;
USART_InitStruct->USART_CPOL = USART_CPOL_Low;
USART_InitStruct->USART_CPHA = USART_CPHA_1Edge;
USART_InitStruct->USART_LastBit = USART_LastBit_Disable;
}
/*******************************************************************************
* Function Name : USART_Cmd
* Description : Enables or disables the specified USART peripheral.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* : - NewState: new state of the USARTx peripheral.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected USART by setting the RUN bit in the CR1 register */
USARTx->CR1 |= CR1_RUN_Set;
}
else
{
/* Disable the selected USART by clearing the RUN bit in the CR1 register */
USARTx->CR1 &= CR1_RUN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_ITConfig
* Description : Enables or disables the specified USART interrupts.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_IT: specifies the USART interrupt sources to be
* enabled or disabled.
* This parameter can be one of the following values:
* - USART_IT_PE
* - USART_IT_TXE
* - USART_IT_TC
* - USART_IT_RXNE
* - USART_IT_IDLE
* - USART_IT_LBD
* - USART_IT_CTS
* - USART_IT_ERR
* - NewState: new state of the specified USARTx interrupts.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ITConfig(USART_TypeDef* USARTx, u16 USART_IT, FunctionalState NewState)
{
u32 usartreg = 0x00, itpos = 0x00, itmask = 0x00;
u32 address = 0x00;
/* Check the parameters */
assert(IS_USART_CONFIG_IT(USART_IT));
assert(IS_FUNCTIONAL_STATE(NewState));
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itpos = USART_IT & USART_IT_Mask;
itmask = (((u32)0x01) << itpos);
address = *(u32*)&(USARTx);
if (usartreg == 0x01) /* The IT is in CR1 register */
{
address += 0x0C;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
address += 0x10;
}
else /* The IT is in CR3 register */
{
address += 0x14;
}
if (NewState != DISABLE)
{
*(u32*)address |= itmask;
}
else
{
*(u32*)address &= ~itmask;
}
}
/*******************************************************************************
* Function Name : USART_DMACmd
* Description : Enables or disables the USART’s DMA interface.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_DMAReq: specifies the DMA request.
* This parameter can be any combination of the following values:
* - USART_DMAReq_Tx
* - USART_DMAReq_Rx
* - NewState: new state of the DMA Request sources.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_DMACmd(USART_TypeDef* USARTx, u16 USART_DMAReq, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_USART_DMAREQ(USART_DMAReq));
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the DMA transfer for selected requests by setting the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 |= USART_DMAReq;
}
else
{
/* Disable the DMA transfer for selected requests by clearing the DMAT and/or
DMAR bits in the USART CR3 register */
USARTx->CR3 &= (u16)~USART_DMAReq;
}
}
/*******************************************************************************
* Function Name : USART_SetAddress
* Description : Sets the address of the USART node.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_Address: Indicates the address of the USART node.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetAddress(USART_TypeDef* USARTx, u8 USART_Address)
{
/* Check the parameters */
assert(IS_USART_ADDRESS(USART_Address));
/* Clear the USART address */
USARTx->CR2 &= CR2_Address_Mask;
/* Set the USART address node */
USARTx->CR2 |= USART_Address;
}
/*******************************************************************************
* Function Name : USART_WakeUpConfig
* Description : Selects the USART WakeUp method.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_WakeUp: specifies the USART wakeup method.
* This parameter can be one of the following values:
* - USART_WakeUp_IdleLine
* - USART_WakeUp_AddressMark
* Output : None
* Return : None
*******************************************************************************/
void USART_WakeUpConfig(USART_TypeDef* USARTx, u16 USART_WakeUp)
{
/* Check the parameters */
assert(IS_USART_WAKEUP(USART_WakeUp));
USARTx->CR1 &= CR3_WAKE_Mask;
USARTx->CR1 |= USART_WakeUp;
}
/*******************************************************************************
* Function Name : USART_ReceiverWakeUpCmd
* Description : Determines if the USART is in mute mode or not.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the USART mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the mute mode USART by setting the RWU bit in the CR1 register */
USARTx->CR1 |= CR1_RWU_Set;
}
else
{
/* Disable the mute mode USART by clearing the RWU bit in the CR1 register */
USARTx->CR1 &= CR1_RWU_Reset;
}
}
/*******************************************************************************
* Function Name : USART_LINBreakDetectLengthConfig
* Description : Sets the USART LIN Break detection length.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_LINBreakDetectLength: specifies the LIN break
* detection length.
* This parameter can be one of the following values:
* - USART_LINBreakDetectLength_10b
* - USART_LINBreakDetectLength_11b
* Output : None
* Return : None
*******************************************************************************/
void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, u16 USART_LINBreakDetectLength)
{
/* Check the parameters */
assert(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
USARTx->CR2 &= CR3_LBDL_Mask;
USARTx->CR2 |= USART_LINBreakDetectLength;
}
/*******************************************************************************
* Function Name : USART_LINCmd
* Description : Enables or disables the USART’s LIN mode.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the USART LIN mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the LIN mode by setting the LINE bit in the CR2 register */
USARTx->CR2 |= CR2_LINE_Set;
}
else
{
/* Disable the LIN mode by clearing the LINE bit in the CR2 register */
USARTx->CR2 &= CR2_LINE_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SendData
* Description : Transmits signle data through the USARTx peripheral.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - Data: the data to transmit.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendData(USART_TypeDef* USARTx, u16 Data)
{
/* Check the parameters */
assert(IS_USART_DATA(Data));
/* Transmit Data */
USARTx->DR = (Data & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_ReceiveData
* Description : Returns the most recent received data by the USARTx peripheral.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Output : None
* Return : The received data.
*******************************************************************************/
u16 USART_ReceiveData(USART_TypeDef* USARTx)
{
/* Receive Data */
return (u16)(USARTx->DR & (u16)0x01FF);
}
/*******************************************************************************
* Function Name : USART_SendBreak
* Description : Transmits break characters.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* Output : None
* Return : None
*******************************************************************************/
void USART_SendBreak(USART_TypeDef* USARTx)
{
/* Send break characters */
USARTx->CR1 |= CR1_SBK_Set;
}
/*******************************************************************************
* Function Name : USART_SetGuardTime
* Description : Sets the specified USART guard time.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_GuardTime: specifies the guard time.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetGuardTime(USART_TypeDef* USARTx, u8 USART_GuardTime)
{
/* Clear the USART Guard time */
USARTx->GTPR &= GTPR_LSB_Mask;
/* Set the USART guard time */
USARTx->GTPR |= (u16)((u16)USART_GuardTime << 0x08);
}
/*******************************************************************************
* Function Name : USART_SetPrescaler
* Description : Sets the system clock prescaler.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_Prescaler: specifies the prescaler clock.
* Output : None
* Return : None
*******************************************************************************/
void USART_SetPrescaler(USART_TypeDef* USARTx, u8 USART_Prescaler)
{
/* Clear the USART prescaler */
USARTx->GTPR &= GTPR_MSB_Mask;
/* Set the USART prescaler */
USARTx->GTPR |= USART_Prescaler;
}
/*******************************************************************************
* Function Name : USART_SmartCardCmd
* Description : Enables or disables the USART’s Smart Card mode.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the Smart Card mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the SC mode by setting the SCEN bit in the CR3 register */
USARTx->CR3 |= CR3_SCEN_Set;
}
else
{
/* Disable the SC mode by clearing the SCEN bit in the CR3 register */
USARTx->CR3 &= CR3_SCEN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_SmartCardNACKCmd
* Description : Enables or disables NACK transmission.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the NACK transmission.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the NACK transmission by setting the NACK bit in the CR3 register */
USARTx->CR3 |= CR3_NACK_Set;
}
else
{
/* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
USARTx->CR3 &= CR3_NACK_Reset;
}
}
/*******************************************************************************
* Function Name : USART_HalfDuplexCmd
* Description : Enables or disables the USART’s Half Duplex communication.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the USART Communication.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
USARTx->CR3 |= CR3_HDSEL_Set;
}
else
{
/* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
USARTx->CR3 &= CR3_HDSEL_Reset;
}
}
/*******************************************************************************
* Function Name : USART_IrDAConfig
* Description : Configures the USART’s IrDA interface.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_IrDAMode: specifies the IrDA mode.
* This parameter can be one of the following values:
* - USART_IrDAMode_LowPower
* - USART_IrDAMode_Normal
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDAConfig(USART_TypeDef* USARTx, u16 USART_IrDAMode)
{
/* Check the parameters */
assert(IS_USART_IRDA_MODE(USART_IrDAMode));
USARTx->CR3 &= CR3_IRLP_Mask;
USARTx->CR3 |= USART_IrDAMode;
}
/*******************************************************************************
* Function Name : USART_IrDACmd
* Description : Enables or disables the USART’s IrDA interface.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - NewState: new state of the IrDA mode.
* This parameter can be: ENABLE or DISABLE.
* Output : None
* Return : None
*******************************************************************************/
void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
{
/* Check the parameters */
assert(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the IrDA mode by setting the IREN bit in the CR3 register */
USARTx->CR3 |= CR3_IREN_Set;
}
else
{
/* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
USARTx->CR3 &= CR3_IREN_Reset;
}
}
/*******************************************************************************
* Function Name : USART_GetFlagStatus
* Description : Checks whether the specified USART flag is set or not.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_FLAG: specifies the flag to check.
* This parameter can be one of the following values:
* - USART_FLAG_CTS
* - USART_FLAG_LBD
* - USART_FLAG_TXE
* - USART_FLAG_TC
* - USART_FLAG_RXNE
* - USART_FLAG_IDLE
* - USART_FLAG_ORE
* - USART_FLAG_NE
* - USART_FLAG_FE
* - USART_FLAG_PE
* Output : None
* Return : The new state of USART_FLAG (SET or RESET).
*******************************************************************************/
FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, u16 USART_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert(IS_USART_FLAG(USART_FLAG));
if ((USARTx->SR & USART_FLAG) != (u16)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearFlag
* Description : Clears the USARTx's pending flags.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_FLAG: specifies the flag to clear.
* This parameter can be any combination of the following values:
* - USART_FLAG_CTS
* - USART_FLAG_LBD
* - USART_FLAG_TXE
* - USART_FLAG_TC
* - USART_FLAG_RXNE
* - USART_FLAG_IDLE
* - USART_FLAG_ORE
* - USART_FLAG_NE
* - USART_FLAG_FE
* - USART_FLAG_PE
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearFlag(USART_TypeDef* USARTx, u16 USART_FLAG)
{
/* Check the parameters */
assert(IS_USART_CLEAR_FLAG(USART_FLAG));
USARTx->SR &= (u16)~USART_FLAG;
}
/*******************************************************************************
* Function Name : USART_GetITStatus
* Description : Checks whether the specified USART interrupt has occurred or not.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_IT: specifies the USART interrupt source to check.
* This parameter can be one of the following values:
* - USART_IT_PE
* - USART_IT_TXE
* - USART_IT_TC
* - USART_IT_RXNE
* - USART_IT_IDLE
* - USART_IT_LBD
* - USART_IT_CTS
* - USART_IT_ORE
* - USART_IT_NE
* - USART_IT_FE
* Output : None
* Return : The new state of USART_IT (SET or RESET).
*******************************************************************************/
ITStatus USART_GetITStatus(USART_TypeDef* USARTx, u16 USART_IT)
{
u32 bitpos = 0x00, itmask = 0x00, usartreg = 0;
ITStatus bitstatus = RESET;
/* Check the parameters */
assert(IS_USART_IT(USART_IT));
/* Get the USART register index */
usartreg = (((u8)USART_IT) >> 0x05);
/* Get the interrupt position */
itmask = USART_IT & USART_IT_Mask;
itmask = (u32)0x01 << itmask;
if (usartreg == 0x01) /* The IT is in CR1 register */
{
itmask &= USARTx->CR1;
}
else if (usartreg == 0x02) /* The IT is in CR2 register */
{
itmask &= USARTx->CR2;
}
else /* The IT is in CR3 register */
{
itmask &= USARTx->CR3;
}
bitpos = USART_IT >> 0x08;
bitpos = (u32)0x01 << bitpos;
bitpos &= USARTx->SR;
if ((itmask != (u16)RESET)&&(bitpos != (u16)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
/*******************************************************************************
* Function Name : USART_ClearITPendingBit
* Description : Clears the USARTx’s interrupt pending bits.
* Input : - USARTx: where x can be 1, 2 or 3 to select the USART
* peripheral.
* - USART_IT: specifies the interrupt pending bit to clear.
* This parameter can be one of the following values:
* - USART_IT_PE
* - USART_IT_TXE
* - USART_IT_TC
* - USART_IT_RXNE
* - USART_IT_IDLE
* - USART_IT_LBD
* - USART_IT_CTS
* - USART_IT_ORE
* - USART_IT_NE
* - USART_IT_FE
* Output : None
* Return : None
*******************************************************************************/
void USART_ClearITPendingBit(USART_TypeDef* USARTx, u16 USART_IT)
{
u32 bitpos = 0x00, itmask = 0x00;
/* Check the parameters */
assert(IS_USART_IT(USART_IT));
bitpos = USART_IT >> 0x08;
itmask = (u32)0x01 << bitpos;
USARTx->SR &= ~itmask;
}
/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/