TI中文支持网今天在实验6678 的IIC总线读写EEPROM的时候遇到一个有意思的问题。
当我连接上仿真器在debug界面 无论怎么点击reset cpu 或者 reset system 或者是restart EEPROM的读写都是正常的。但只有点击了停止仿真，在不断电的情况下，在连接进行仿真 就一直出现iic总线超时，不知是什么原因？ 请高手指点一下，谢谢
程序中 I2C_write（）I2C_read（）均为 Keystone_I2C_init_drv.c 中定义函数
main
{
…………
I2C_Master_Init(400);
for(i=0; i<100; i++)
{
memset(IIC_Rcv_buf,0x30,256);
memset(IIC_Snd_buf,0x1+i,256);
/* fill with pattern */
I2C_EEPROM_block_write( I2C_address, address0, 256, &IIC_Snd_buf[0]);
I2C_EEPROM_read( I2C_address, address0 , 256, &IIC_Rcv_buf[0]);
printf("%x is receive \n", IIC_Rcv_buf[0]);
……
}
Uint32 I2C_EEPROM_block_write(Uint32 I2C_address, Uint32 data_address, Uint32 uiByteCount, Uint8 * ucBuffer)
{
Uint8 i2cBuffer[I2C_EEPROM_BLOCK_SIZE+4];
/*put data address into first two bytes of i2cBuffer,
and write it to I2C EEPROM*/
i2cBuffer[0]= data_address>>8;
i2cBuffer[1]= data_address;
memcpy(i2cBuffer+2, ucBuffer, uiByteCount);
uiByteCount= I2C_write(I2C_address, uiByteCount+2, i2cBuffer, I2C_WAIT);
if(uiByteCount>2)
{
uiByteCount-= 2;
//wait about 5ms for I2C EEPROM internal write complete
TSC_delay_ms(5);
}
else
uiByteCount=0;
return uiByteCount;
}
Uint32 I2C_EEPROM_read(Uint32 I2C_address, Uint32 data_address, Uint32 uiByteCount, Uint8 * ucBuffer)
{
Uint8 ucAddrBuffer[4];
Uint32 byteSuccess=0;
/*put data address into first two bytes of ucBuffer,
and write it to I2C EEPROM*/
ucAddrBuffer[0]= data_address>>8;
ucAddrBuffer[1]= data_address;
/*Dummy write, setup read address*/
byteSuccess= I2C_write(I2C_address, 2, ucAddrBuffer, I2C_WAIT);
if(2!=byteSuccess)
return 0;
//wait about 5ms for I2C EEPROM internal write complete
TSC_delay_ms(5);
/*read data*/
byteSuccess= I2C_read(I2C_address, uiByteCount, ucBuffer, I2C_WAIT);
return byteSuccess;
}
bomer：
你的eeprom有没有写保护。
lei zhang1：
回复 bomer:
用万用表看了一下，写保护信号一直是低
而且 在不好用的情况下 是SCL SDA信号没有反应 SCL一直是高
JY LI：
请问你的例程是哪里的？是PDK包里的吗
