STM32F303 discovery I2c interrupts are not working.

[Channamallesh Hiremath]

Posted on May 16, 2018 at 04:22

Hello,

I have modified STM32F303 discovery demonstration code to use I2C interrupts instead of polling mode.

For some reason, I am not getting any interrupts. 

Can someone check my code? 

I added a function call to enable interrupts and populated the interrupt vector code. 

/* LSM303DLHC_I2C Peripheral Enable */

I2C_Cmd(LSM303DLHC_I2C, ENABLE);

I2C_ITConfig(LSM303DLHC_I2C, I2C_IT_ERRI|I2C_IT_TCI|I2C_IT_STOPI|I2C_IT_NACKI|I2C_IT_ADDRI|I2C_IT_RXI|I2C_IT_TXI, ENABLE);

// interrupt handler

void I2C1_ER_IRQHandler(void)

{ I2C_ClearFlag(LSM303DLHC_I2C, I2C_FLAG_BERR|I2C_FLAG_ARLO|I2C_FLAG_OVR);}

__IO uint32_t interrupt_count = 0;

void I2C1_EV_IRQHandler(void)

{

interrupt_count = interrupt_count++;

if(MasterMode==MASTER_MODE_TRANSMITTER){

if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_TXIS)==SET)&&(i2c_state_g==0)) { I2C_SendData(LSM303DLHC_I2C, (uint8_t) RegAddr_g); i2c_state_g = 1; interrupt_count = interrupt_count+0x100; } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_TCR)==SET)&&(i2c_state_g==1)) { /* Configure slave address, nbytes, reload, end mode and start or stop generation */ I2C_TransferHandling(LSM303DLHC_I2C, DeviceAddr_g, 1, I2C_AutoEnd_Mode, I2C_No_StartStop); i2c_state_g = 2; interrupt_count = interrupt_count+0x800; } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_TXIS) == SET)&&(i2c_state_g==2)) { /* Write data to TXDR */ I2C_SendData(LSM303DLHC_I2C, *pBuffer_g); i2c_state_g = 3; interrupt_count = interrupt_count+0x1000; } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_STOPF) == SET)&&(i2c_state_g==3)) { I2C_ClearFlag(LSM303DLHC_I2C, I2C_ICR_STOPCF); i2c_state_g = 0; i2c_busy_g = 0; interrupt_count = interrupt_count+0x8000; } }else{ if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_TXIS) == SET)&&(i2c_state_g==0)) { if(NumByteToRead_g>1) RegAddr_g |= 0x80;

/* Send Register address */

I2C_SendData(LSM303DLHC_I2C, (uint8_t)RegAddr_g); i2c_state_g = 1; } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_TC) == SET)&&(i2c_state_g==1)) { /* Configure slave address, nbytes, reload, end mode and start or stop generation */ I2C_TransferHandling(LSM303DLHC_I2C, DeviceAddr_g, NumByteToRead_g, I2C_AutoEnd_Mode, I2C_Generate_Start_Read); i2c_state_g = 2; } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_RXNE) == SET)&&(i2c_state_g==2)) { /* Read data from RXDR */ *pBuffer_g = I2C_ReceiveData(LSM303DLHC_I2C); pBuffer_g++; NumByteToRead_g--; if(NumByteToRead_g==0) { i2c_state_g = 3; } } if((I2C_GetFlagStatus(LSM303DLHC_I2C, I2C_ISR_STOPF)==SET)&&(i2c_state_g==3)) { /* Clear STOPF flag */ I2C_ClearFlag(LSM303DLHC_I2C, I2C_ICR_STOPCF); i2c_state_g = 0; i2c_busy_g = 0; } }

}