Posted on October 31, 2012 at 21:57I am communicating with a slave device and after the generation of the start condition, I am not seeing SCL and SDA pulsing. Below is the code:
void DS2482_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
/* Enable peripheral clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
/* Enable GPIOB clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Configure I2C2_SCL and I2C2_SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Enable I2C2 reset state */
//RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
/* Release I2C2 from reset state */
//RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
I2C_DeInit(DS2482_I2C);
/* DS2482 peripheral configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = DS2482_I2C_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = DS2482_I2C_SPEED;
/* enable the I2C peripheral */
I2C_Cmd(DS2482_I2C, ENABLE);
I2C_Init(DS2482_I2C, &I2C_InitStructure);
}
int DS2482_channel_select(int channel)
{
// select the 1-wire channel on DS2482-800
// Returns: TRUE if channel selected
// FALSE if device not detected
unsigned char ch, ch_read, check;
/* while the bus is busy */
while(I2C_GetFlagStatus(DS2482_I2C, I2C_FLAG_BUSY));
/* send START condition */
I2C_GenerateSTART(DS2482_I2C, ENABLE);
/* test on EV5 and clear it */
while(!I2C_CheckEvent(DS2482_I2C, I2C_EVENT_MASTER_MODE_SELECT));
//I2C_AcknowledgeConfig(DS2482_I2C, ENABLE);
/* Send DS2482 address for write */
I2C_Send7bitAddress(DS2482_I2C, DS2482_I2C_ADDRESS, I2C_Direction_Transmitter);
#i2c-example-stm32
