S3C2440IIC interrupt mode-EEWORLD

Collect

#include
#include "2440addr.h"
#include "2440lib.h"
#include "Option.h"
#include "def.h"
int flag; //interrupt flag (cleared in the interrupt subroutine, i.e. flag=1 before interruption, flag=0 after interruption)
void __irq IicInt(void);
void Wr24C02(U32 slvAddr,U32 addr,U8 data);
void Rd24C02(U32 slvAddr,U32 addr,U8 *data);
void Main(void)
{
unsigned int i,j;
static U8 data[256]; //Used to store the data read out by AT24C02
SelectFclk(2); //Set the system clock to 400M
ChangeClockDivider(2, 1); //Set the frequency division to 1:4:8
CalcBusClk(); //Calculate bus frequency
rGPHCON &=~((3<<4)|(3<<6));
rGPHCON |=(2<<4)|(2<<6); //GPH2--TXD[0];GPH3--RXD[0]
rGPHUP=0x00; //Enable pull-up function
Uart_Init(0,115200);
Uart_Select(0);
Uart_Printf("[ IIC Test(Polling) using AT24C020 ]\n");
rGPEUP |= 0xc000; //Close the pull-up
rGPECON &= ~0xf0000000;
rGPECON |= 0xa0000000; //GPE15:IICSDA , GPE14:IICSCL
pISR_IIC=(unsigned)IicInt; //Set the interrupt program address
rINTMSK &=~(BIT_IIC); //Open interrupt source
//Enable response, IIC bus clock IICCLK=PCLK/16, enable interrupt, send clock IICCLK/16
rIICCON = (1<<7) | (0<<6) | (1<<5) | (0xf);
rIICADD = 0x10; //2440 slave address = [7:1]
rIICSTAT = 0x10; //IIC bus data output enable (Rx/Tx)
Uart_Printf("Write test data into AT24C02\n");
for(i=0;i<256;i++)
Wr24C02(0xa0,(U8)i,i); //Write data to AT24C02
for(i=0;i<256;i++) // array data clear
data[i] = 0;
Uart_Printf("Read test data from AT24C02\n");
for(i=0;i<256;i++)
Rd24C02(0xa0,(U8)i,&(data[i])); //Read the data from AT24C02 and put it into the data array
for(i=0;i<16;i++)
{
for(j=0;j<16;j++)
Uart_Printf("%2x ",data[i*16+j]); //Print the data read from AT24C02
Uart_Printf("\n");
}
}
void Wr24C02(U32 slvAddr, U32 addr, U8 data)
{
flag=1;
rIICDS = slvAddr; //Write data shift register from device address
rIICSTAT=0xf0; //Master mode, generate start signal, enable Rx/Tx
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
flag=1;
rIICDS = addr; //Write the address of the storage byte to the data shift register
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
flag=1;
rIICDS = data; //Write the data to be sent into the data shift register
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
rIICSTAT = 0xd0; // Disable Rx/Tx
rIICCON = 0xaf; //Resumes IIC operation.
Delay(1);
}
void Rd24C02(U32 slvAddr, U32 addr, U8 *data)
{
U8 temp;
flag=1;
rIICDS = slvAddr; //Write data shift register from device address
rIICSTAT=0xf0; //Master mode, generate start signal, enable Rx/Tx
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
flag=1;
rIICDS = addr; //Write the address of the storage byte to the data shift register
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
flag=1;
rIICDS = slvAddr;
rIICSTAT=0xb0; //Master receiving mode, enable Rx/Tx
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1) //Wait for sending to complete
Delay(1);
//Note: Reading the following byte must be done because after sending the slave device address with the read command,
//AT24C02A will return a slave device address or slave device memory address as a response, so
// Be sure to discard the byte after reading it, because it is not the information we want to read;
flag=1;
temp=rIICDS;
rIICCON &=~0x10; //Clear Tx/Rx interrupt pending flag
while(flag==1)
Delay(1);
rIICCON=0x2f; //Resumes IIC operation. Disable response
*data=rIICDS;
Delay(1);
rIICSTAT = 0x90; //Stop MasRx condition
rIICCON = 0xaf; //Resumes IIC operation.
Delay(1); //Wait until stop condtion is in effect.
}
void __irq IicInt(void)
{
ClearPending(BIT_IIC);
flag=0;
}

Keywords：S3C2440 IIC Reference address：S3C2440IIC interrupt mode

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