SPI0_MISO, ADC01_IN6, TIMER2_CH0 TIMER0_BRKIN SPI1_NSS, I2S_WS, I2C1_SMBA, USART2_CK, TIMER0_BRKIN, CAN1_RX WKUP, USART1_CTS, ADC0_IN0 TIMER1_CH0_ETI, TIMER4_CH0 I2C0_SMBA, SPI2_MOSI, I2S2_SD TIMER2_CH1, SPI0_MOSI, CAN1_RX USART0_CK, TIMER0_CH0, CK_OUT0, USBFS_SOF The Function column gives the alternate function description of the pin, any function after a " " is a remap function (whatever that means, I obviously have a lot to learn). The labels with the white background are those found on the schematic. Basically they are the pin name and default function of the corresponding core pins as described in section 2.6.3 GD32VF103Cx pin definitions of the data sheet. The labels with the green background next to the pin numbers are those printed on the board. The header numbers correspond to the numbering on the schematic and follow the convention of assigning number 1 to the pin with the square solder mask. Imagine that the board is in the narrow white column in the centre, with the USB-C connector visible and at the bottom (as shown in the left photograph above). Here is my poor attempt at documenting the connections on the board based on the schematic and the GD32VF103 Datasheet (rev 1.1). So far, I have not seen an official pinout. The Wio Core "can be considered equivalent to ESP-WROOM-02 except that the original firmware is replaced with firmware." Pinout