marlinfw/buildroot/share/PlatformIO/variants/marlin_maple_CHITU_F103/variant.h

#pragma once

#define digitalPinToPort(P)        ( PIN_MAP[P].gpio_device )
#define digitalPinToBitMask(P)     ( BIT(PIN_MAP[P].gpio_bit) )
#define portOutputRegister(port)   ( &(port->regs->ODR) )
#define portInputRegister(port)    ( &(port->regs->IDR) )

#define portSetRegister(pin)       ( &(PIN_MAP[pin].gpio_device->regs->BSRR) )
#define portClearRegister(pin)     ( &(PIN_MAP[pin].gpio_device->regs->BRR) )

#define portConfigRegister(pin)    ( &(PIN_MAP[pin].gpio_device->regs->CRL) )

static const uint8_t SS   = BOARD_SPI1_NSS_PIN;
static const uint8_t SS1  = BOARD_SPI2_NSS_PIN;
static const uint8_t MOSI = BOARD_SPI1_MOSI_PIN;
static const uint8_t MISO = BOARD_SPI1_MISO_PIN;
static const uint8_t SCK  = BOARD_SPI1_SCK_PIN;