Internal I/O Ports:
1x 40-pin heade
up to 28 x GPIO pins
up to 2 x SPI bus
up to 2 x I2C bus
up to 4 x UART
up to 2 x PWM
up to 1 x PCM/I2S
2x 5V power pins
2x 3.3V power pins
8x ground pins
1x 2-pin contact pin
1x PWM
1x S/PDIF
1x 15-pin MIPI DSI
1x 15-pin MIPI CSI
