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Had to modify this functions to be compatible with the current HAL from ST.

` void DHT22_Config_GPIO_INPUT() { #if 0 DHT22_Pin_GPIO_Config.GPIO_Pin = DHT22_Pin; DHT22_Pin_GPIO_Config.GPIO_Mode = GPIO_MODE_IN_FLOATING; DHT22_Pin_GPIO_Config.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB,&DHT22_Pin_GPIO_Config); #else GPIO_InitTypeDef GPIO_InitStruct = {0};

/*Configure GPIO pin : PB6 */
GPIO_InitStruct.Pin = DHT22_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

#endif }

void DHT22_Config_GPIO_OUTPUT() { #if 0 DHT22_Pin_GPIO_Config.GPIO_Pin = DHT22_Pin; DHT22_Pin_GPIO_Config.GPIO_Mode = GPIO_Mode_Out_PP; DHT22_Pin_GPIO_Config.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB,&DHT22_Pin_GPIO_Config); #else GPIO_InitTypeDef GPIO_InitStruct = {0};

/*Configure GPIO pin : PB6 */
GPIO_InitStruct.Pin = DHT22_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;     //HAD TO SWITCH TO OPEN DRAIN INSTEAD OF PUSH-PULL
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

//somehow a bug was setting the pin MODE to 0x0, which is reserved in output configuration
//this restores proper value
GPIOB->CRL |= 0x03000000;

#endif } `

Making output open drain worked around an apparent conflict in my HW that caused multiple EXTI interrupts at begining of start pulse, after switching to open drain, it looks OK:

Also due to using CubeMX hardware configurator the code generated already makes EXTI interrupts and inits clocks, so these two functions were not needed:

//DHT22_Config_CLK(); //DHT22_Config_EXTInterrupt_Enable();

Great code!