cancel
Showing results for 
Search instead for 
Did you mean: 

StdPepiph Library I2C

Peter Stradala
Associate
Posted on January 26, 2017 at 16:18

Hi everyone,

I'm new in STM32 and try to run I2C but when I try to connect with other device program stay in endles loop

while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);

What could be wrong ?

My code:

void init_I2C()
{
 GPIO_InitTypeDef GPIO_InitStructure;
 I2C_InitTypeDef I2C_InitStructure;
 
 
 RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
 
 GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_I2C2);
 GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_I2C2);
 GPIO_StructInit( &GPIO_InitStructure);
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
 GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
 GPIO_Init(GPIOB, &GPIO_InitStructure);
 I2C_StructInit(&I2C_InitStructure);
 I2C_InitStructure.I2C_ClockSpeed = 50000;
 I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
 I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
 I2C_InitStructure.I2C_OwnAddress1 = 0;
 I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;
 I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
 I2C_Init(I2C2, &I2C_InitStructure);
 I2C_Cmd(I2C2, ENABLE);
}
void read_I2C()
{
 I2C_GenerateSTART(I2C2, ENABLE);
 while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
 I2C_Send7bitAddress(I2C2, 0xa0, I2C_Direction_Receiver);
 while (I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS);
}�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?

0 REPLIES 0