Posted on May 19, 2015 at 22:05I have a stm32l00rb that I have set up as a slave. I have a SoC with embedded linux that I am using as the master. I am trying to use i2cdetect on the master (SoC) to detect the slave (stm32lxx), but I am getting no response.
My logic is i2cdetect writes 0x00 - 0x77 to the i2c bus and if the slave has the corresponding address it will reply. I set the slave address to 0x0A which is within the range, but with no success.
void
init_I2C1(
void
){
GPIO_InitTypeDef
GPIO_InitStruct;
I2C_InitTypeDef
I2C_InitStruct;
NVIC_InitTypeDef
NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,
ENABLE
);
GPIO_InitStruct.
GPIO_Pin
= GPIO_Pin_11 | GPIO_Pin_10;
GPIO_InitStruct.
GPIO_Mode
=
GPIO_Mode_AF
;
GPIO_InitStruct.
GPIO_Speed
=
GPIO_Speed_40MHz;
GPIO_InitStruct.
GPIO_OType
=
GPIO_OType_OD;
GPIO_InitStruct.
GPIO_PuPd
=
GPIO_PuPd_UP
;
GPIO_Init(GPIOB, &GPIO_InitStruct);
// Connect I2C1 pins to AF
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_I2C1);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,
ENABLE
);
I2C_InitStruct.
I2C_ClockSpeed
= 400000;
//10000; // 10KHz
I2C_InitStruct.
I2C_Mode
= I2C_Mode_I2C;
I2C_InitStruct.
I2C_DutyCycle
= I2C_DutyCycle_2;
I2C_InitStruct.
I2C_OwnAddress1
= 0x0A;
I2C_InitStruct.
I2C_Ack
= I2C_Ack_Enable;
//I2C_Ack_Disable;
I2C_InitStruct.
I2C_AcknowledgedAddress
= I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStruct);
I2C_Cmd(I2C1,
ENABLE
);
// I2C1 interrupts
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.
NVIC_IRQChannel
=
I2C1_EV_IRQn;
NVIC_InitStructure.
NVIC_IRQChannelPreemptionPriority
= 1;
NVIC_InitStructure.
NVIC_IRQChannelSubPriority
= 0;
NVIC_InitStructure.
NVIC_IRQChannelCmd
=
ENABLE
;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.
NVIC_IRQChannel
=
I2C1_ER_IRQn;
NVIC_Init(&NVIC_InitStructure);
I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_ERR,
ENABLE
);
}
void
I2C1_EV_IRQHandler(
void
){
volatile
uint32_t
temp;
switch
(I2C_GetLastEvent(I2C1)){
case
I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED:
I2C_SendData(I2C1, 0x0A);
break
;
case
I2C_EVENT_SLAVE_BYTE_RECEIVED:
I2C_SendData(I2C1, 0x0A);
//I2C_InputBuffer[I2C_InputBufferIndex++] = I2C_ReceiveData(I2C1);
break
;
case
I2C_EVENT_SLAVE_STOP_DETECTED:
break
;
}
// ADDR & STOPF cleaning
while
((I2C1->
SR1
& I2C_SR1_ADDR) == I2C_SR1_ADDR)
{
temp=I2C1->
SR1
;
temp=I2C1->
SR2
;
}
while
((I2C1->
SR1
&I2C_SR1_STOPF) == I2C_SR1_STOPF)
{
temp=I2C1->
SR1
;
I2C1->
CR1
|= 0x1;
}
}
/* ********* MAIN ************* */
int
main(
void
)
{
init_I2C1();
while
(1){
I2C1_EV_IRQHandler();
}
}
#stm32 #i2c #slave
