/* -------------------------------------------------------------------
Name: I2C_RxData -
Purpose:
To do I2C parallel serial conversion for reception.
Passed: None.
Returns:
Notes:
------------------------------------------------------------------- */
UB8 I2C_RxData (void)
{
UB8 bResult;
UB8 bMask;
bResult = 0x00; /* Clear value */
// Release SDA
//I2C_SET_SDA(HIGH);
BIT1216M_I2C_SDA_HIGH;
/* MSB is read first */
for (bMask = 0x80; bMask; bMask >>= 1)
{
//I2C_SET_SCL(HIGH);
BIT1216M_I2C_SCL_HIGH;
I2C_Delay(I2C_HIGH);
//if ( I2C_GET_SDA )
if (BIT1216M_I2C_SDA_DETECT)
bResult |= bMask;
//I2C_SET_SCL(LOW);
BIT1216M_I2C_SCL_LOW;
I2C_Delay(I2C_LOW); // Added by JC 06:31PM 2011/01/12
} /* for */
return( bResult );
} /* I2C_RxData */
unsigned char I2C_Tx(unsigned char data) // Does this comply exactly with I2C??
{
unsigned char x;
static unsigned char ACK;
for ( x=8 ; x>0 ; x-- )
{
if (data & 0x80)
SDA_Tx = 1;
else
SDA_Tx = 0;
SCL_Tx = 1;
I2C_Delay(I2C_Clock);
data <<= 1;
SCL_Tx = 0;
I2C_Delay(I2C_Clock);
}
SDA_Tx = 1;
I2C_Delay(I2C_Clock);
SCL_Tx = 1;
I2C_Delay(I2C_Clock);
ACK = SDA_Rx; // Retrieve ACK bit
SCL_Tx = 0;
return ACK;
}
/*------------------------------------------------------------------*-
I2C_Read_Byte()
Read a byte of data from the Slave.
Supports slow Slaves by allowing 'clock stretching'.
-*------------------------------------------------------------------*/
tByte I2C_Read_Byte(void)
{
tByte result = 0; // Return value with read I2C byte
tByte Bit = 0; // Bitcounter
for (Bit = 0; Bit < 8; Bit++ )
{
I2C_SDA = 1; // Release SDA
I2C_SCL = 1; // Release SCL
if (I2C_Sync_The_Clock_T0())
{
return 1; // Error - failed to sync
}
I2C_Delay();
result <<= 1; // Shift left the result
if (I2C_SDA)
{
result |= 0x01; // Set actual SDA state to LSB
}
I2C_SCL = 0; // Force a clock cycle
I2C_Delay();
}
return(result);
}
unsigned char I2C_Rx(unsigned char ACK)
{
unsigned char x, d = 0;
SDA_Tx = 1;
for ( x=0 ; x<8 ; x++)
{
d <<= 1;
do
{
SCL_Tx = 1;
}
while (SCL_Rx == 0); // Wait through clock-stretching
I2C_Delay(I2C_Clock);
if (SDA_Rx)
d |= 1;
SCL_Tx = 0;
I2C_Delay(I2C_Clock);
}
if (!ACK)
SDA_Tx = 0;
else
SDA_Tx = 1;
I2C_Delay(I2C_Clock);
SCL_Tx = 1; // Sending (N)ACK
I2C_Delay(I2C_Clock);
SCL_Tx = 0;
I2C_Delay(I2C_Clock);
SDA_Tx = 1;
return d;
}
/* -------------------------------------------------------------------
Name: I2C_TxData -
Purpose: To do I2C parallel serial conversion for transmission.
Passed:
Returns: None.
Notes:
------------------------------------------------------------------- */
void I2C_TxData (UB8 bData)
{
UB8 bMask;
/* MSB is sent first */
for (bMask = 0x80; bMask; bMask >>= 1)
{
//I2C_SET_SDA(bData & bMask);
if (bData & bMask)
{
BIT1216M_I2C_SDA_HIGH;
}
else
{
BIT1216M_I2C_SDA_LOW;
}
I2C_Delay(I2C_SU_DAT);
//I2C_SET_SCL(HIGH);
BIT1216M_I2C_SCL_HIGH;
I2C_Delay(I2C_HIGH);
//I2C_SET_SCL(LOW);
BIT1216M_I2C_SCL_LOW;
I2C_Delay(I2C_LOW);
}
//I2C_SET_SDA(HIGH); // Added by JC 01:47PM 2005/11/23
BIT1216M_I2C_SDA_HIGH;
} /* I2C_TxData */
/*------------------------------------------------------------------*-
I2C_Send_Stop()
Generates a 'stop' condition (see text for details).
-*------------------------------------------------------------------*/
void I2C_Send_Stop(void)
{
I2C_SDA = 0;
I2C_Delay();
I2C_SCL = 1;
I2C_Delay();
I2C_SDA = 1;
}
void S_NoACK(void) //Send No ACK (High)
{
SDA = 1;
I2C_Delay();
SCL = 1;
I2C_Delay();
SCL = 0;
I2C_Delay();
}
void S_ACK(void) //Send ACK (LOW)
{
SDA = 0;
I2C_Delay();
SCL = 1;
I2C_Delay();
SCL = 0;
I2C_Delay();
}
void I2C_Stop(void) //STOP the I2C, SDA Low-to-high when SCL is high
{
SDA = 0;
I2C_Delay();
SCL = 1;
I2C_Delay();
SDA = 1;
I2C_Delay();
}
void I2C_Stop()
{
SDA_Tx = 0; // Stop sequence
I2C_Delay(I2C_Clock);
SCL_Tx = 1;
I2C_Delay(I2C_Clock);
SDA_Tx = 1;
I2C_Delay(I2C_Clock);
}
void I2C_Stop(void)
{
SDA_L;
SCL_H;
I2C_Delay();
SDA_H;
I2C_Delay();
}
/*****************************************************************************
函 数 名 : WriteBeforeRead
功能描述 :
输入参数 : 无
输出参数 : 无
返 回 值 : void
调用函数 :
被调函数 :
修改历史 :
1. 2013.4.12 c00213799 对接器件读时序差异
*****************************************************************************/
EFI_STATUS
EFIAPI
WriteBeforeRead(I2C_DEVICE *I2cInfo, UINT32 ulLength, UINT8 *pBuf)
{
UINT32 ulFifo;
UINT32 ulCnt;
UINT32 ulTimes = 0;
UINTN Base = PlatformGetI2cBase(I2cInfo->Socket, I2cInfo->Port);
//设置slave地址为DIMM0
I2C_SetTarget(I2cInfo->Socket,I2cInfo->Port,I2cInfo->SlaveDeviceAddress);
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
while(0 != ulFifo)
{
I2C_Delay(2);
if(++ulTimes > I2C_READ_TIMEOUT)
{
return EFI_TIMEOUT;
}
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
}
ulTimes = 0;
for(ulCnt = 0; ulCnt < ulLength; ulCnt++)
{
while(ulFifo > I2C_TXRX_THRESHOLD)
{
if(++ulTimes > I2C_READ_TIMEOUT)
{
return EFI_TIMEOUT;
}
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
}
I2C_REG_WRITE(Base + I2C_DATA_CMD_OFFSET, *pBuf++);
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
}
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
ulTimes = 0;
while(0 != ulFifo)
{
I2C_Delay(2);
if(++ulTimes > I2C_READ_TIMEOUT)
{
return EFI_TIMEOUT;
}
ulFifo = I2C_GetTxStatus(I2cInfo->Socket,I2cInfo->Port);
}
return EFI_SUCCESS;
}
void I2C_SW::I2C_Stop(void)
{
SCL_LO;
I2C_Delay();
SDA_LO;
I2C_Delay();
I2C_SCLHigh();
I2C_Delay();
SDA_HI;
I2C_Delay();
}
bool I2C_Start(void)
{
SDA_H;
SCL_H;
I2C_Delay();
SDA_L;
I2C_Delay();
SCL_L;
return TRUE;
}
void I2C_Start(void) //start the I2C, SDA High-to-low when SCL is high
{
SDA = 1;
I2C_Delay();
SCL = 1;
I2C_Delay();
SDA = 0;
I2C_Delay();
SCL = 0;
I2C_Delay();
}
void I2C_SW::I2C_SendNoAck(void)
{
SCL_LO;
I2C_Delay();
SDA_HI;
I2C_Delay();
I2C_SCLHigh();
I2C_Delay();
SCL_LO;
I2C_Delay();
}
/*------------------------------------------------------------------*-
I2C_Send_Start()
Generates a 'start' condition (see text for details).
-*------------------------------------------------------------------*/
void I2C_Send_Start(void)
{
// Prepare the bus
I2C_SCL = 1;
I2C_SDA = 1;
I2C_Delay();
// Generate the START condition
I2C_SDA = 0;
I2C_Delay();
I2C_SCL = 0;
}
//void I2C_Check_ACK(void) //Check ACK, If F0=0, then right, if F0=1, then error
void I2C_Check_ACK(char ack) //Check ACK, If F0=0, then right, if F0=1, then error
{
if(ack == 1)
SDA = 1;
else
SDA = 0;
I2C_Delay();
SCL = 1;
I2C_Delay();
F0 = SDA;
SCL = 0;
I2C_Delay();
}
void I2C_Ack(void)
{
SCL_L;
I2C_Delay();
SDA_L;
I2C_Delay();
SCL_H;
I2C_Delay();
SCL_L;
I2C_Delay();
SCL_H;
SDA_H;
}
/* -------------------------------------------------------------------
Name: I2C_SetNAK -
Purpose: .
Passed: None.
Returns: None.
Notes:
------------------------------------------------------------------- */
void I2C_SetNAK (void)
{
//I2C_SET_SDA(HIGH);
BIT1216M_I2C_SDA_HIGH;
I2C_Delay(I2C_SU_DAT);
//I2C_SET_SCL(HIGH);
BIT1216M_I2C_SCL_HIGH;
I2C_Delay(I2C_HIGH);
//I2C_SET_SCL(LOW);
BIT1216M_I2C_SCL_LOW;
I2C_Delay(I2C_LOW);
} /* I2C_SetNAK */
uint8_t I2C_SW::I2C_WaitAck(void)
{
SCL_LO;
I2C_Delay();
SDA_HI;
I2C_Delay();
I2C_SCLHigh();
I2C_Delay();
if (SDA_STATE()) {
SCL_LO;
return 0;
}
SCL_LO;
return 1;
}
/*------------------------------------------------------------------*-
I2C_Get_Ack_From_Slave()
We are implementing a 'Master-Slave' communication protocol
here, with the microcontroller as the Master. This function
waits (with timeout) for an acknowledgement from the Slave device.
-*------------------------------------------------------------------*/
tByte I2C_Get_Ack_From_Slave(void)
{
// Prepare the bus
I2C_SDA = 1;
I2C_SCL = 1;
if(I2C_Sync_The_Clock_T0())
{
return 1; // Error - failed to sync
}
// Managed to synchronise the clock
I2C_Delay();
if (I2C_SDA)
{
// Generate a clock cycle
I2C_SCL = 0;
return 1; // Error - No ack from slave
}
I2C_SCL = 0; // Generate a clock cycle
return 0; // OK - Slave issued ack
}
/*------------------------------------------------------------------*-
I2C_Write_Byte()
Send a byte of data to the Slave.
Supports slow Slaves by allowing 'clock stretching'.
-*------------------------------------------------------------------*/
tByte I2C_Write_Byte(tByte Data)
{
tByte Bit = 0;
// Sending data one bit at a time (MS bit first)
for (Bit = 0; Bit < 8; Bit++ )
{
I2C_SDA = (bit)((Data & 0x80) >> 7);
I2C_SCL = 1;
if (I2C_Sync_The_Clock_T0())
{
return 1; // Error - failed to sync
}
I2C_Delay();
// Generate a clock cycle
I2C_SCL = 0;
// Prepare to send next bit
Data <<= 1;
}
// Make sure the slave acknowledges
return(I2C_Get_Ack_From_Slave());
}
/* -------------------------------------------------------------------
Name: I2C_SetACK -
Purpose: .
Passed: None.
Returns: None.
Notes:
------------------------------------------------------------------- */
void I2C_SetACK (void)
{
// I2C_SET_SDA(LOW);
BIT1216M_I2C_SDA_LOW;
I2C_Delay(I2C_SU_DAT);
//I2C_SET_SCL(HIGH);
BIT1216M_I2C_SCL_HIGH;
I2C_Delay(I2C_HIGH);
//I2C_SET_SCL(LOW);
BIT1216M_I2C_SCL_LOW;
I2C_Delay(I2C_LOW);
//I2C_SET_SDA(HIGH); // Added by JC 09:32AM 2010/04/04
BIT1216M_I2C_SDA_HIGH;
} /* I2C_SetACK */
u8 I2C_ReadAbyte(void) //read A byte from I2C
{
u8 i,dat;
i = 8;
SDA = 1;
do
{
SCL = 1;
I2C_Delay();
dat <<= 1;
if(SDA) dat++;
SCL = 0;
I2C_Delay();
}
while(--i);
return(dat);
}
uint8_t I2C_SW::I2C_ReceiveByte(void)
{
uint8_t i = 8;
uint8_t Data = 0;
SDA_HI;
while (i--) {
Data <<= 1;
SCL_LO;
I2C_Delay();
I2C_SCLHigh();
I2C_Delay();
if (SDA_STATE()) {
Data |= 0x01;
}
}
SCL_LO;
return Data;
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main()
{
int i;
/*System clock configuration*/
SystemInit();
/* UART0 and UART1 configuration*/
UART_StructInit(&UART_InitStructure);
/* Configure UART0 */
UART_Init(UART1,&UART_InitStructure);
printf("######## I2C EEPROM TEST #########\r\n");
/* I2C Init */
/* I2C confiugred as follow:
* - I2C master mode
* - I2C slave address : 0xA0
* - I2C Prescale : 0x61
* /If MCU clock is 20MHz and Prescale value is 0x61, SCL occurs 100KHz as clock.
* - I2C Timeout : 0xFFFF
*/
conf.mode = I2C_Master;
conf.slave_address = 0xA0;
conf.master.prescale = 0x61;
conf.master.timeout = 0xFFFF;
/* Cofigure I2C0 */
I2C_Init(I2C0, conf);
/* EEPROM Write Test*/
/* It can transmit up to 9data bytes to the EEPROM(24AA02) ( mem_address 1byte, data 8bytes ) */
if( I2C_Burst_Write(I2C0,conf.slave_address,&Transmit_Data[0],9,1) == -1 )
return -1;
/*It must be use the delay function between Write operation and Read operation */
I2C_Delay(0x000F0000);
/*I2C Core reset */
I2C_Reset(I2C0);
// EEPROM Read Test
/* I2C Start */
I2C_Start(I2C0,conf.slave_address,I2C_WRITE_SA7);
/* The memory address of EEPROM send to EEPROM and it wait the ack signal */
I2C_SendDataAck(I2C0,0x00);
/*Once the Slave address and memotu address are clocked in and
*acknowledged by the EEPROM, the W7500 must generate another start condition.*/
I2C_Restart_Structure(I2C0,conf.slave_address,I2C_READ_SA7);
/* EEPROM Read Test*/
for(i=0;i<MAX_SIZE;i++)
{
if(i != MAX_SIZE-1) Recv_Data[i] = I2C_ReceiveData(I2C0,0);
else Recv_Data[i] = I2C_ReceiveData(I2C0,1);
}
for(i=0;i<MAX_SIZE-2;i+=2)
printf("[%02d]:%02x, [%02d]:%02x\r\n",i,Recv_Data[i],i+1,Recv_Data[i+1]);
return 0;
}
void I2C_WriteAbyte(u8 dat) //write a byte to I2C
{
u8 i;
i = 8;
do
{
if(dat & 0x80) SDA = 1;
else SDA = 0;
dat <<= 1;
I2C_Delay();
SCL = 1;
I2C_Delay();
SCL = 0;
I2C_Delay();
}
while(--i);
I2C_Check_ACK(1); //接收应答信号
}
/*------------------------------------------------------------------*-
I2C_Send_Master_NAck()
Generates a 'Not Acknowledge' condition (see text for details).
-*------------------------------------------------------------------*/
void I2C_Send_Master_NAck(void)
{
I2C_SDA = 1; I2C_SCL = 1;
I2C_Sync_The_Clock_T0();
I2C_Delay();
I2C_SCL = 0;
}
/* -------------------------------------------------------------------
Name: I2C_Start - START condition (SDA falling edge).
Purpose: .
Passed: None.
Returns: None.
Notes:
Reference:
[1] p64
------------------------------------------------------------------- */
void I2C_Start (void)
{
DEBUG_MSG(("<<====I2C_Start====>>\r\n"));
//I2C_SET_SDA(HIGH);
BIT1216M_I2C_SDA_HIGH;
//I2C_SET_SCL(HIGH);
BIT1216M_I2C_SCL_HIGH;
I2C_Delay(I2C_SU_STA);
//I2C_SET_SDA(LOW);
BIT1216M_I2C_SDA_LOW;
I2C_Delay(I2C_HD_STA);
//I2C_SET_SCL(LOW);
BIT1216M_I2C_SCL_LOW;
I2C_Delay(I2C_LOW);
} /* I2C_Start */