Posted on March 15, 2012 at 05:57I'm trying to get I2C working, I've verified I can manually toggle the pins at 400KHz with a pull up resistor. I can't seem to get the I2C code to work correctly though.
input_clock = CLK_GetClockFreq()/1000000;
I2C_DeInit();
I2C_Cmd(ENABLE);
I2C_Init(I2C_MAX_STANDARD_FREQ,
0xA0,
I2C_DUTYCYCLE_2,
I2C_ACK_CURR,
I2C_ADDMODE_7BIT,
input_clock);
(void)I2C->SR1;
(void)I2C->SR3;
while (1)
{
while (I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));
I2C_GenerateSTART(ENABLE);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(0xA0, I2C_DIRECTION_TX);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
I2C_SendData(0xCA);
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED));
I2C_GenerateSTOP(ENABLE);
}
The code always get stuck at ''
while (I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));
''
I've read the errata and don't really see anything similar to this. Also I currently don't have pull-up resistors on the lines while using this code, would this cause the I2C code to error out and always say its busy?
#i2c-busy-bit-set
