新手求教。我想在dali协议库里增加一些操作IO口的功能，比如按某个按键的时候，指定的IO口出个低电平，或者其他类似的功能，这样是否可行？但是现在死活都改不了电平状态，请大家指教一下。我在DALI_Init里加入了那4句操控PA2，设置断点可以进去，应该PA2要出个高电平吧，但是一直都是低电平，这是为什么？还有哪里需要设置些什么吗？
void DALI_Init(TDLightControlCallback LightControlFunction)
{
/* Pull-up Vdd pin for data output */
DALI_PULLUP_PORT->ODR |= (1<<DALI_PULLUP_PIN); //high level
DALI_PULLUP_PORT->DDR |= (1<<DALI_PULLUP_PIN); //output mode
DALI_PULLUP_PORT->CR1 |= (1<<DALI_PULLUP_PIN); //push-pull
DALI_PULLUP_PORT->CR2 |= (1<<DALI_PULLUP_PIN); //slow slope
GPIOA->DDR |= 1<<2;
GPIOA->CR1 |= 1<<2;
GPIOA->CR2 |= 1<<2;
GPIOA->ODR |= 1<<2;
/* button pin for data input */
DALI_BUTTON_PORT->DDR &= ~(1<<DALI_BUTTON_PIN); //input mode
DALI_BUTTON_PORT->ODR &= ~(1<<DALI_BUTTON_PIN); //low level
DALI_BUTTON_PORT->CR1 |= (1<<DALI_BUTTON_PIN); //pull-up
DALI_BUTTON_PORT->CR2 &= ~(1<<DALI_BUTTON_PIN); //interrupt disable on pin
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