/*!
\brief set GPIO alternate function
\param[in] port
\arg GPIOx(x = A,B,C,D,F)
\param[in] alt_func_num
\arg GPIO_AF_0: EVENTOUT, TIMER14, SPI0, I2S0, TIMER16,MCO, SWDAT, SWCLK, TIMER14,USART0, CEC, IR_OUT, SPI1
\arg GPIO_AF_1: USART0, USART1, CEC, TIMER2, IR_OUT, EVENTOUT, I2C0, I2C1, TIMER14
\arg GPIO_AF_2: TIMER1, TIMER0, EVENTOUT, TIMER15, TIMER16
\arg GPIO_AF_3: TSI, I2C0, TIMER14, EVENTOUT
\arg GPIO_AF_4: TIMER13, I2C1, I2C0, USART1
\arg GPIO_AF_5: TIMER15, TIMER16
\arg GPIO_AF_6: EVENTOUT, SPI1
\arg GPIO_AF_7: CMP0_OUT, CMP1_OUT
\arg GPIO_AF_8:
\arg GPIO_AF_9: CAN0,CAN1
\arg GPIO_AF_10:
\arg GPIO_AF_11: SLCD
\param[in] pin
\arg GPIO_PIN_x(x=0..15), GPIO_PIN_ALL
\param[out] none
\retval none
*/
void gpio_af_set(uint32_t port, uint8_t alt_func_num, uint16_t pin)
{
uint16_t i;
uint32_t afrl, afrh;
afrl = GPIO_AFSEL0(port);
afrh = GPIO_AFSEL1(port);
for (i = 0; i < 8; i++){
if (!((1 << i) & pin)){
continue;
}
/* clear the specified pin alternate function bits */
afrl &= ~GPIO_AFR_MASK(i);
afrl |= GPIO_AFR_SET(i, alt_func_num);
}
for (i = 8; i < 16; i++){
if (!((1 << i) & pin)){
continue;
}
/* clear the specified pin alternate function bits */
afrh &= ~GPIO_AFR_MASK(i - 8);
afrh |= GPIO_AFR_SET(i - 8, alt_func_num);
}
GPIO_AFSEL0(port) = afrl;
GPIO_AFSEL1(port) = afrh;
}
/*!
\brief set GPIO alternate function
\param[in] gpio_periph: GPIOx(x = A,B,C)
only one parameter can be selected which is shown as below:
\arg GPIOx(x = A,B,C)
\param[in] alt_func_num: GPIO pin af function, please refer to specific device datasheet
\arg GPIO_AF_0: TIMER13, TIMER14, TIMER16, SPI0, SPI1, I2S0, CK_OUT, USART0,
I2C0, I2C1, SWDIO, SWCLK
\arg GPIO_AF_1: USART0, USART1, TIMER2, TIMER14, I2C0, I2C1
\arg GPIO_AF_2: TIMER0, TIMER1, TIMER15, TIMER16, I2S0
\arg GPIO_AF_3: I2C0, TIMER14
\arg GPIO_AF_4(port A,B only): USART1, I2C0, I2C1, TIMER13
\arg GPIO_AF_5(port A,B only): TIMER15, TIMER16, I2S0
\arg GPIO_AF_6(port A,B only): SPI1
\arg GPIO_AF_7(port A,B only): CMP
\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_af_set(uint32_t gpio_periph, uint32_t alt_func_num, uint32_t pin)
{
uint16_t i;
uint32_t afrl, afrh;
afrl = GPIO_AFSEL0(gpio_periph);
afrh = GPIO_AFSEL1(gpio_periph);
for(i = 0U;i < 8U;i++){
if((1U << i) & pin){
/* clear the specified pin alternate function bits */
afrl &= ~GPIO_AFR_MASK(i);
afrl |= GPIO_AFR_SET(i,alt_func_num);
}
}
for(i = 8U;i < 16U;i++){
if((1U << i) & pin){
/* clear the specified pin alternate function bits */
afrh &= ~GPIO_AFR_MASK(i - 8U);
afrh |= GPIO_AFR_SET(i - 8U,alt_func_num);
}
}
GPIO_AFSEL0(gpio_periph) = afrl;
GPIO_AFSEL1(gpio_periph) = afrh;
}
