您好，我想初步测试一下I2C回环接口，设置模式寄存器DLB比特位，代码如下：
Int16 EVMDM368_I2C_loopback( Uint16 i2c_addr, Uint8* data, Uint16 len )
{
Int32 timeout, i;
I2C_ICCNT = len; // Set length
I2C_ICSAR = i2c_addr; // Set I2C slave address
I2C_OAR = i2c_addr;
I2C_ICMDR = ICMDR_STT // Set for Master Write
| ICMDR_TRX
| ICMDR_MST
| ICMDR_DLB;
_wait( 10 ); // Short delay
for ( i = 0 ; i < len ; i++ )
{
I2C_ICDXR = data[i]; // Write
timeout = 0x10000;
do
{
if ( timeout-- < 0 )
{
EVMDM368_I2C_reset( );
return -1;
}
} while ( ( I2C_ICSTR & ICSTR_ICXRDY ) == 0 );// Wait for Tx Ready
}
Uint8 data1[2];
memset(data1,0,2);
EVMDM368_waitusec(30);
//I2C_ICMDR = ICMDR_STT // Set for Master Write
// | ICMDR_MST;
I2C_ICCNT = 1;
data1[0] = I2C_ICDRR;
printf("loopback receive %x\n",data1[0]);
I2C_ICMDR |= ICMDR_STP; // Generate STOP
while(I2C_ICSTR & 0x1000);
EVMDM368_waitusec(30);
return 0;
}
调用上面的函数发送一个字节0xaa，发送成功了，但是接收不到。请问什么原因？？
请帮忙？？谢谢！！
