void I2C1_EV_IRQHandler(void)
{
if(I2C1->SR1 & I2C_SR1_SB)
{
I2C_SendAddress();
}
if(I2C1->SR1 & I2C_SR1_ADDR)
{
if(I2C1->SR2 & I2C_SR2_TRA)
{
I2C_OperateTransmitter();
}
else
{
I2C_OperateReceiver();
}
}
if(I2C1->SR1 & I2C_SR1_TXE)
{
I2C_TransmitRegisterEmpty();
}
if(I2C1->SR1 & I2C_SR1_RXNE)
{
I2C_ReceiveRegisterNotEmpty();
}
}
static rt_size_t stm32_i2c_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[], rt_uint32_t num)
{
struct rt_i2c_msg *msg;
rt_int32_t i, ret;
I2C_GenerateSTART(I2C1, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
for (i = 0; i < num; i++)
{
msg = &msgs[i];
if (!(msg->flags & RT_I2C_NO_START))
{
if (i)
{
I2C_GenerateSTART(I2C1, ENABLE);
}
I2C_SendAddress(I2C1, msg);
if (msg->flags & RT_I2C_RD)
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
else
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
}
if (msg->flags & RT_I2C_RD)
{
if (!(msg->flags & RT_I2C_NO_READ_ACK))
I2C_AcknowledgeConfig(I2C1,ENABLE);
else
I2C_AcknowledgeConfig(I2C1,DISABLE);
ret = stm32_i2c_recv_bytes(I2C1, msg);
if (ret >= 1)
i2c_dbg("read %d byte%s\n",
ret, ret == 1 ? "" : "s");
if (ret < msg->len)
{
if (ret >= 0)
ret = -RT_EIO;
goto out;
}
}
else
{
ret = stm32_i2c_send_bytes(I2C1, msg);
if (ret >= 1)
i2c_dbg("write %d byte%s\n",
ret, ret == 1 ? "" : "s");
if (ret < msg->len)
{
if (ret >= 0)
ret = -RT_ERROR;
goto out;
}
}
}
ret = i;
out:
i2c_dbg("send stop condition\n");
I2C_GenerateSTOP(I2C1, ENABLE);
return ret;
}
