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Supowang1989 ef82dbfc6d add modbus slave support
add modbus slave support
2020-02-24 21:40:06 +08:00

376 lines
13 KiB
C

/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name : i2c.c
* Author : MCD Application Team
* Date First Issued : 09/05/2003
* Description : This file provides Code sources I2C functions
********************************************************************************
* History:
* 13/01/2006 : V3.1
* 24/05/2005 : V3.0
* 30/11/2004 : V2.0
* 14/07/2004 : V1.3
* 01/01/2004 : V1.2
*******************************************************************************
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.
*******************************************************************************/
#include "i2c.h"
#include "rccu.h"
#include <stdarg.h>
/*******************************************************************************
* Function Name : I2C_Init
* Description : Initializes I2C peripheral control and registers to their
* default reset values.
* Input : I2Cx ( I2C0 or I2C1 )
* Return : None.
*******************************************************************************/
void I2C_Init (I2C_TypeDef *I2Cx)
{
/* Initialize all the register of the specified I2C passed as parameter */
I2Cx->CR=0x0;
I2Cx->CCR=0x0;
I2Cx->ECCR=0x0;
I2Cx->OAR1=0x0;
I2Cx->OAR2=0x0;
(void)I2Cx->SR1;
(void)I2Cx->SR2;
I2Cx->DR=0x0;
}
/*******************************************************************************
* Function Name : I2C_OnOffConfig
* Description : Enables or disables I2C peripheral.
* Input : I2Cx ( I2C0 or I2C1 )
* condition(ENABLE or DISABLE).
* Return : None.
*******************************************************************************/
void I2C_OnOffConfig (I2C_TypeDef *I2Cx, FunctionalState NewState)
{
if (NewState == ENABLE)
{
/* Enable the I2C selected by setting twice the PE bit on the CR register */
I2Cx->CR |= I2C_PESET_Mask;
I2Cx->CR |= I2C_PESET_Mask;
}
else
/* Disable the I2C selected */
I2Cx->CR &= ~I2C_PESET_Mask;
}
/*******************************************************************************
* Function Name : I2C_FlagStatus
* Description : Checks whether any I2C Flag is set or not.
* Input : I2Cx ( I2C0 or I2C1 )
* Access(DIRECT or INDIRECT)
* Flag : the flag to be read
* input 4: an (u8) variable needed in the case
* of the INDIRECT access
* Return : the NewState of the Flag (SET or RESET).
*******************************************************************************/
FlagStatus I2C_FlagStatus (I2C_TypeDef *I2Cx, RegisterAccess Access, I2C_Flags Flag, ...)
{
u32 Tmp=0;
if (Access == DIRECT)
/* Store in Tmp variable the register where is located the flag */
Tmp = I2C_GetStatus(I2Cx)&Flag;
else
{
va_list list;
/* Get the fourth register */
va_start(list,Flag);
Tmp = va_arg(list,u32);
Tmp&=Flag;
}
/* Return the Flag NewState */
return Tmp != 0 ? SET : RESET;
}
/*******************************************************************************
* Function Name : I2C_FlagClear
* Description : Clears the I2C Flag passed as a parameter
* Input : I2Cx ( I2C0 or I2C1 )
* Flag : the flag to be read
* input3: an (u8) parameter needed in the case that the flag
* to be cleared need a write in one register
* Return : None.
*******************************************************************************/
void I2C_FlagClear (I2C_TypeDef *I2Cx, I2C_Flags Flag, ...)
{
u8 Tmp = (u8)*((u32 *)&Flag + sizeof(Flag));
if (Flag==I2C_ADD10 || Flag==I2C_EVF || Flag==I2C_BERR || Flag==I2C_ARLO ||
Flag==I2C_STOPF || Flag==I2C_AF || Flag==I2C_ENDAD)
/* flags that need a read of the SR2 register to be cleared */
{
/* Read the SR2 register */
(void)I2Cx->SR2;
/* Two flags need a second step to be cleared */
switch (Flag)
{
case I2C_ADD10: I2Cx->DR = Tmp; break;
case I2C_ENDAD: I2Cx->CR|=0x20; break;
}
}
else if (Flag==I2C_SB || Flag==I2C_ADSL || Flag==I2C_BTF || Flag==I2C_TRA)
/* flags that need a read of the SR1 register to be cleared */
{
/* Read the SR1 register */
(void)I2Cx->SR1;
if (Flag==I2C_SB) I2Cx->DR=Tmp;
else if (Flag==I2C_BTF || Flag==I2C_TRA) (void)I2Cx->DR;
}
else if ( Flag==I2C_M_SL || Flag==I2C_GCAL)
/*flags that need the PE bit to be cleared */
{
I2C_OnOffConfig (I2Cx, DISABLE);
I2C_OnOffConfig (I2Cx, ENABLE);
}
}
/*******************************************************************************
* Function Name : I2C_SpeedConfig
* Description : Selects I2C clock speed and configures its corresponding mode.
* Input : I2Cx ( I2C0 or I2C1 )
* Clock: I2C expected clock in Hertz.
* Return : None.
*******************************************************************************/
void I2C_SpeedConfig (I2C_TypeDef *I2Cx, u32 Clock)
{
u32 FCLK=0;
u16 result=0;
/* Get the FCLK frequency using the RCCU library */
FCLK = RCCU_FrequencyValue ( RCCU_FCLK );
/* Test on speed mode */
/* Update the CCR and ECCR are updated */
if (Clock <=100000)
/* Standard mode selected */
{
result = ((FCLK / Clock) - 7)/2;
/* Clear FM/SM bit */
I2Cx->CCR=result &0x7f;
}
else if (Clock <=400000)
{
/* Fast mode selected */
result = ((FCLK/Clock)-9)/3;
/* set FM/SM bit */
I2Cx->CCR=result |0x80;
}
I2Cx->ECCR= result >>7;
}
/*******************************************************************************
* Function Name : I2C_AddressConfig
* Description : Defines the I2C bus address of the interface.
* Input : I2Cx ( I2C0 or I2C1 ).
* Address: an u16 parameter indicating the address
* of the interface.
* Mode (I2C_Mode10,I2C_Mode7).
* Return : None.
*******************************************************************************/
void I2C_AddressConfig (I2C_TypeDef *I2Cx, u16 Address, I2C_Addressing Mode)
{
/* Update OAR1 bit[7:1] by the lowest byte of address */
I2Cx->OAR1 = (u8)Address;
if (Mode == I2C_Mode10)
/* Update Add8 and add9 bits in OAR2 */
I2Cx->OAR2 |= (Address & 0x0300)>>7;
}
/*******************************************************************************
* Function Name : I2C_FCLKConfig
* Description : Configures frequency bits according to RCLK frequency.
* the selected I2C must be disabled
* Input : I2Cx ( I2C0 or I2C1 )
* Return : None.
*******************************************************************************/
void I2C_FCLKConfig (I2C_TypeDef *I2Cx)
{
u32 FCLK=0;
/* Get the FCLK frequency using the RCCU library */
FCLK = RCCU_FrequencyValue ( RCCU_FCLK );
/* Test the value of the FCLK and affect FR0,FR1&FR2 of the OAR2 register */
if (FCLK > 5000000)
{
if (FCLK <10000000)
I2Cx->OAR2 |= 0x00;
else if (FCLK <16670000)
I2Cx->OAR2 |= 0x20;
else if (FCLK < 26670000)
I2Cx->OAR2 |= 0x40;
else if (FCLK <40000000)
I2Cx->OAR2 |= 0x60;
else if (FCLK < 53330000)
I2Cx->OAR2 |= 0x80;
else if (FCLK < 66000000)
I2Cx->OAR2 |= 0xA0;
else if (FCLK <80000000)
I2Cx->OAR2 |= 0xC0;
else if (FCLK <100000000)
I2Cx->OAR2 |= 0xE0;
}
}
/*******************************************************************************
* Function Name : I2C_AddressSend
* Description : Transmits the address byte to select the slave device.
* Input : I2Cx ( I2C0 or I2C1 )
* Address: an u16 parameter indicating the slave address
* Mode (I2C_Mode10,I2C_Mode7).
* Direction (I2C_RX,I2C_TX).
* Return : None.
********************************************************************************/
void I2C_AddressSend (I2C_TypeDef *I2Cx, u16 Address, I2C_Addressing Mode, I2C_Direction Direction)
{
if (Mode == I2C_Mode10 )
/*10 bit addressing mode */
{
/* Update the DR register by generated header */
I2Cx->DR = ((Address>>7)|0xf0)&0xfe;
/* Wait till I2C_ADD10 flag is set */
while ((I2Cx->SR1&0x40)==0);
/* clear I2C_ADD10 flag */
(void)I2Cx->SR2;
I2Cx->DR=(u8)Address;
/* Test on the direction to define the read/write bit */
if (Direction == I2C_RX)
{
/* Wait till I2C_ENDAD flag is set */
while ((I2Cx->SR2&0x20)==0);
I2Cx->CR|=0x20;
/* Repeated START Generate */
I2C_STARTGenerate (I2Cx, ENABLE);
/* Test on SB flag status */
while ((I2Cx->SR1&0x01)==0);
I2Cx->DR = ((Address>>7)|0xf1);
}
}
else
/* 7 bit addressing mode */
{
if (Direction == I2C_RX) Address|=0x01; else Address&=~0x01;
I2Cx->DR=(u8)Address;
}
}
/*******************************************************************************
* Function Name : I2C_ByteSend
* Description : Send a single byte of data.
* Input : I2Cx ( I2C0 or I2C1 )
* Data : the byte to be sent to the slave
* Return : None.
*******************************************************************************/
void I2C_ByteSend (I2C_TypeDef *I2Cx, u8 Data)
{
/* Write in the DR register the byte to be sent */
I2Cx->DR = Data;
}
/*******************************************************************************
* Function Name : I2C_TransmissionStatus
* Description : Report the NewState of the transmission
* Input : I2Cx ( I2C0 or I2C1 )
* Return : I2C_Tx_Status :transmission status (I2C_TX_NO, I2C_TX_SB,
* I2C_TX_AF, I2C_TX_ARLO, I2C_TX_BERR,I2C_TX_ADD_OK,
* I2C_TX_DATA_OK,I2C_TX_ONGOING)
*******************************************************************************/
I2C_Tx_Status I2C_TransmissionStatus (I2C_TypeDef *I2Cx)
{
u8 SR1value=0;
u8 SR2value=0;
I2C_Tx_Status NewState = I2C_TX_NO;
SR1value = I2Cx->SR1;
SR2value = I2Cx->SR2;
if ((I2Cx->SR1&0x10)==0)
NewState=I2C_TX_NO;
else if (I2Cx->SR1&0x01)
/* I2C_SB bit is set */
NewState=I2C_TX_SB;
else if ((SR2value & 0x10)&&(I2Cx->CR&0x04))
/* I2C_ACK &I2C_AF are both set */
NewState=I2C_TX_AF;
else if (SR2value & 0x04)
/* I2C_ARLO is set in multimaster mode */
NewState=I2C_TX_ARLO;
else if (SR2value & 0x02)
/* I2C_BERR bit is set */
NewState=I2C_TX_BERR;
else if ((SR1value & 0x80)&& (I2Cx->SR2&0x20))
/* I2C_EVF and I2C_ENDAD are both set */
NewState=I2C_TX_ADD_OK;
else if ((I2Cx->SR1&0x20)&& (I2Cx->SR1&0x08))
/* I2C_TRA and I2C_BTF are both set */
NewState=I2C_TX_DATA_OK;
else
NewState=I2C_TX_ONGOING;
return NewState;
}
/*******************************************************************************
* Function Name : I2C_ByteReceive
* Description : Returns the received byte.
* Input : I2Cx ( I2C0 or I2C1 )
* Return : the byte received
*******************************************************************************/
u8 I2C_ByteReceive (I2C_TypeDef *I2Cx)
{
/* Wait till I2C_BTF bit is set */
while ((I2Cx->SR1 & 0x08)==0);
return I2Cx->DR;
}
/*******************************************************************************
* Function Name :I2C_ReceptionStatus
* Description : Report the reception NewState.
* Input : I2Cx ( I2C0 or I2C1 )
* Return : I2C_Rx_Status:the NewState of the reception ( I2C_RX_NO,
* I2C_RX_SB,I2C_RX_AF,I2C_RX_ARLO,I2C_RX_BERR,I2C_RX_ADD_OK,
* I2C_RX_DATA_OK, I2C_RX_ONGOING)
*******************************************************************************/
I2C_Rx_Status I2C_ReceptionStatus (I2C_TypeDef *I2Cx)
{
u8 SR1value=0;
u8 SR2value=0;
I2C_Rx_Status NewState = I2C_RX_NO;
SR1value= I2Cx->SR1;
SR2value= I2Cx->SR2;
if ((I2Cx->SR1&0x10) == 0)
NewState=I2C_RX_NO;
else if (I2Cx->SR1&0x01)
/* I2C_SB bit is set */
NewState=I2C_RX_SB;
else if ((SR2value & 0x10) && (I2Cx->CR&0x04))
/* I2C_ACK &I2C_AF are both set */
NewState=I2C_RX_AF;
else if (SR2value & 0x04)
/* I2C_ARLO is set */
NewState=I2C_RX_ARLO;
else if (SR2value & 0x02)
/* I2C_BERR bit is set */
NewState=I2C_RX_BERR;
else if ((SR1value & 0x80) && (I2Cx->SR1&0x08)==0)
/* I2C_EVF is set & I2C_BTF is not set */
NewState=I2C_RX_ADD_OK;
else if ((I2Cx->SR1&0x20)==0 && (I2Cx->SR1&0x08))
/* I2C_TRA is cleared & I2C_BTF is set */
NewState=I2C_RX_DATA_OK;
else
NewState=I2C_RX_ONGOING;
return NewState;
}
/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/