I2c communication stm32f3 how can i solve? - stm32

Question

i want to read touch activity from the touchscreen.If i touch, i want to led blink. Some my definitions in below code but generally i want to get my activity with i2c
Some definitions:
uint8_t deviceaddr;
static uint32_t touch_i2c_read(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t *pBuffer, uint16_t len);
static const int I2C_TIMEOUT = 65536;
unsigned char i2c_buffer[256];
uint32_t res;
This is my i2c read code:
static uint32_t touch_i2c_read(uint8_t DeviceAddr, uint8_t RegAddr, uint8_t *pBuffer, uint16_t len)
{ //uint8_t deviceaddr ,0x00,(uint8_t *)&buf, sizeof(buf)
uint32_t timeout = I2C_TIMEOUT;
while (I2C_GetFlagStatus(I2C1, I2C_ISR_BUSY) != RESET)
{
if ((timeout--) == 0)
return 0;
}
I2C_TransferHandling(I2C1, DeviceAddr << 1, 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write);
/* !!! Wait until TXIS flag is set !!! */
timeout = I2C_TIMEOUT;
while (I2C_GetFlagStatus(I2C1, I2C_ISR_TXIS) == RESET)
{
if ((timeout--) == 0)
return 0;
}
}
This is my settings
void configure_interrupt_pins()
{
GPIO_InitTypeDef GPIO_InitStruct;
EXTI_InitTypeDef EXTI_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStruct);
/*ENABLE CLOCK FOR GPIOX*/
RCC_APB1PeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
// ENABLE CLOCK FOR SYSCFG
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
//SET PIN AS INPUT
// init_pin(EX_NCVIC_PORT, EX_NCVIC_Pin, GPIO_MODE_INPUT, GPIO_Speed_50MHz, GPIO_OType_PP, GPIO_PuPd_UP);
//TELL THE SYSTEM THAT YOU WILL USE PXX FOR EXTI_LineX
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOx, EXTI_PinSourcex);
//CONFIGIRATION of exti
EXTI_InitStruct.EXTI_Line = EXTI_Linex; //pxx connect to line x
EXTI_InitStruct.EXTI_LineCmd = ENABLE; //enable interrupt
EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt; //interrupt mode
EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Rising_Falling; //triggers on rising and failing edge
EXTI_Init(&EXTI_InitStruct); //add to exti
//CONFIGURATION of nvic
NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}
This is my interrupt
void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus((EXTI_Line0) != RESET))
{
res = touch_i2c_read(0x42, 0x00, i2c_buffer, 22);
printf("deneme");
if (!res)
{
GPIO_SetBits(GPIOE, GPIO_Pin_13);
}
else
{
GPIO_SetBits(GPIOE, GPIO_Pin_13);
}
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
But my code not working. Stm32 dont understand touch activity how can i solve this.
Edit i change line 1 every external interupts but i have res value 0 how can i fix this it must be different 0

Answer 1

Using a while() loop in an interrupt will cause problems, because the controller will never exit the loop. Try to use your i2c read Function in main() (with other words, a not-interrupt-context) and look if it works there.

Answer 2

I solved this error.
I hadn't any signal pb7 and pb6 so i changed codes as below:
// enable APB1 peripheral clock for I2C1
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// enable clock for SCL and SDA pins
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
And then,
Device adress of the FT6236 was mising. it is not include at datasheet so i used debugging. I found the device adress which is the (0x32). And than my code working succesfully.