void gpio_init(GPIO_TypeDef *port, uint16_t pin) {
    port->MODER  &= ~(0x3 << (pin * 2));
    port->MODER  |=  (0x1 << (pin * 2));
    port->OTYPER &= ~(1 << pin);
    port->OSPEEDR |= (0x3 << (pin * 2));
}

static inline void spi_transfer(uint8_t *buf, size_t len) {
    while (len--) {
        SPI1->DR = *buf;
        while (!(SPI1->SR & SPI_SR_TXE));
        *buf++ = SPI1->DR;
    }
}

{{ t.name }}

{{ t.eyebrow }}

{{ t.heroTitle }}

{{ t.heroBody1 }}

{{ t.heroBody2 }}

{{ t.knxLabel }}

{{ t.knxNumber }}

{{ t.peritoLabel }}