void
gpio_init(int pin, int mode){
GPIO_TypeDef *addr = _gpio_addr(pin);
if( !addr ) return;
int plx = splhigh();
int io = pin >> 4;
pin &= 0xF;
int pos = (pin & 0x7) << 2;
#if defined(PLATFORM_STM32F4) || defined(PLATFORM_STM32F7)
RCC->AHB1ENR |= 1 << io;
#elif defined(PLATFORM_STM32F0)
RCC->AHBENR |= 1 << (io + 17);
#elif defined(PLATFORM_STM32L4)
RCC->AHB2ENR |= 1 << io;
#elif defined(PLATFORM_STM32L1)
// F,G,H are mixed-up on the L1
switch( io ){
case 5: RCC->AHBENR |= 1 << 6; break;
case 6: RCC->AHBENR |= 1 << 7; break;
case 7: RCC->AHBENR |= 1 << 5; break;
default:
RCC->AHBENR |= 1 << io;
break;
}
#else
# error "unknown platform"
#endif
addr->MODER &= ~( 3 << (pin*2) );
addr->PUPDR &= ~( 3 << (pin*2) );
addr->OSPEEDR &= ~( 3 << (pin*2) );
addr->MODER |= (mode&3) << (pin*2);
addr->PUPDR |= ((mode>>5) & 3) << (pin*2);
addr->OSPEEDR |= ((mode>>3) & 3) << (pin*2);
addr->OTYPER &= ~( 1<<pin );
addr->OTYPER |= ((mode>>2) & 1) << pin;
if( pin >= 8 ){
addr->AFRH &= ~(0xF << pos);
addr->AFRH |= ((mode>>8) & 0xF) << pos;
}else{
void
gpio_init(uint32_t pin, uint32_t mode){
int plx = splhigh();
int io = pin >> 5;
Pio *addr = _gpio_addr(pin);
pin &= 0x1F;
_unprotect(addr);
// (1:input schmitt) (1:input deglitch) (2:pull up/dn) (1:push/pull,open-drain) (2:AF) (2:mode)
switch( mode & 3 ){
case GPIO_INPUT:
_enable_pio(io);
// fall through
case GPIO_ANALOG:
addr->PIO_PER = 1<<pin;
addr->PIO_ODR = 1<<pin;
break;
case GPIO_OUTPUT:
_enable_pio(io);
addr->PIO_PER = 1<<pin;
addr->PIO_OER = 1<<pin;
addr->PIO_OWER = 1<<pin; // permit writes via odsr
break;
default:
addr->PIO_PDR = 1<<pin;
addr->PIO_ODR = 1<<pin;
switch( mode & 0xF ){
case GPIO_AF_A:
addr->PIO_ABCDSR[0] &= ~(1<<pin);
addr->PIO_ABCDSR[1] &= ~(1<<pin);
break;
case GPIO_AF_B:
addr->PIO_ABCDSR[0] |= 1<<pin;
addr->PIO_ABCDSR[1] &= ~(1<<pin);
break;
case GPIO_AF_C:
addr->PIO_ABCDSR[0] &= ~(1<<pin);
addr->PIO_ABCDSR[1] |= 1<<pin;
break;
case GPIO_AF_D:
addr->PIO_ABCDSR[0] |= 1<<pin;
addr->PIO_ABCDSR[1] |= 1<<pin;
break;
}
break;
}
// push-pull or open-drain
if( mode & GPIO_OPEN_DRAIN )
addr->PIO_MDER |= 1<<pin;
else
addr->PIO_MDDR |= 1<<pin;
// pull up, pull down?
if( mode & GPIO_PULL_UP )
addr->PIO_PUER |= 1<<pin;
else
addr->PIO_PUDR |= 1<<pin;
if( mode & GPIO_PULL_DN )
addr->PIO_PPDER |= 1<<pin;
else
addr->PIO_PPDDR |= 1<<pin;
// input filters
if( mode & GPIO_SCHMITT )
addr->PIO_SCHMITT |= 1<<pin;
else
addr->PIO_SCHMITT &= ~(1<<pin);
// ...
_protect(addr);
splx(plx);
}