AVR I2C故障 [英] AVR I2C trouble

问题描述

我正在尝试使用I2C与AT90CAN128进行通信，但是它并没有超出while循环的要求:

I am trying to communicate using I2C with AT90CAN128, But it is not going further than following while loop:

while(!(TWCR & (1<<TWINT)));

它保留在while循环中. 据我说，它不能设置TWINT标志.

It remains in the while loop. According to me, it is not able to set TWINT flag.

void TWI_start(void)
{
  TWCR= (1<<TWINT)|(1<<TWSTA)|(1<<TWEN); 
  while(!(TWCR & (1<<TWINT)));`enter code here`
  while((TWSR & 0xF8)!= 0x08); 
}

有什么建议吗?

推荐答案

可能是硬件问题.

TWI主站试图声明SDA和SCL，并检查SDA和SCL是否都在GND.检查连接和上拉电阻的值.如果控制器无法将线拉低，则START条件永远不会被注册，并且TWINT也永远不会被设置.

The TWI Master tries to assert SDA and SCL and checks if both SDA and SCL are at GND. Check the connections and the value of your pull-up resistors. If the controller fails to pull the lines down, the START condition never gets registered and TWINT will never get set.

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