/*!
\brief set GPIO mode
\param[in] gpio_periph: GPIOx(x = A,B,C,F)
only one parameter can be selected which is shown as below:
\arg GPIOx(x = A,B,C,F)
\param[in] mode: gpio pin mode
\arg GPIO_MODE_INPUT: input mode
\arg GPIO_MODE_OUTPUT: output mode
\arg GPIO_MODE_AF: alternate function mode
\arg GPIO_MODE_ANALOG: analog mode
\param[in] pull_up_down: gpio pin with pull-up or pull-down resistor
\arg GPIO_PUPD_NONE: floating mode, no pull-up and pull-down resistors
\arg GPIO_PUPD_PULLUP: with pull-up resistor
\arg GPIO_PUPD_PULLDOWN:with pull-down resistor
\param[in] pin: GPIO pin
one or more parameters can be selected which are shown as below:
\arg GPIO_PIN_x(x=0..15), GPIO_PIN_ALL
\param[out] none
\retval none
*/
void gpio_mode_set(uint32_t gpio_periph, uint32_t mode, uint32_t pull_up_down, uint32_t pin)
{
uint16_t i;
uint32_t ctl, pupd;
ctl = GPIO_CTL(gpio_periph);
pupd = GPIO_PUD(gpio_periph);
for(i = 0U;i < 16U;i++){
if((1U << i) & pin){
/* clear the specified pin mode bits */
ctl &= ~GPIO_MODE_MASK(i);
/* set the specified pin mode bits */
ctl |= GPIO_MODE_SET(i, mode);
/* clear the specified pin pupd bits */
pupd &= ~GPIO_PUPD_MASK(i);
/* set the specified pin pupd bits */
pupd |= GPIO_PUPD_SET(i, pull_up_down);
}
}
GPIO_CTL(gpio_periph) = ctl;
GPIO_PUD(gpio_periph) = pupd;
}
/*!
\brief set GPIO output mode
\param[in] port
\arg GPIOx(x = A,B,C,D,F)
\param[in] mode
\arg GPIO_MODE_INPUT: input mode
\arg GPIO_MODE_OUTPUT: output mode
\arg GPIO_MODE_AF: alternate function mode
\arg GPIO_MODE_ANALOG: analog mode
\param[in] pull_up_down
\arg GPIO_PUPD_NONE: without weak pull-up and pull-down resistors
\arg GPIO_PUPD_PULLUP: with weak pull-up resistors
\arg GPIO_PUPD_PULLDOWN:with weak pull-down resistors
\param[in] pin
\arg GPIO_PIN_x(x=0..15), GPIO_PIN_ALL
\param[out] none
\retval none
*/
void gpio_mode_set(uint32_t port, uint8_t mode, uint8_t pull_up_down,uint16_t pin)
{
uint16_t i;
uint32_t ctl, pupd;
ctl = GPIO_CTL(port);
pupd = GPIO_PUD(port);
for (i = 0; i < 16; i++){
if (!((1 << i) & pin)){
continue;
}
/* clear the specified pin mode bits */
ctl &= ~GPIO_MODE_MASK(i);
ctl |= GPIO_MODE_SET(i, mode);
/* clear the specified pin pupd bits */
pupd &= ~GPIO_PUPD_MASK(i);
pupd |= GPIO_PUPD_SET(i, pull_up_down);
}
GPIO_CTL(port) = ctl;
GPIO_PUD(port) = pupd;
}