SPI，I2C接口
From ESS-WIKI
SPI (CN21)
RSB-4680 provides one SPI pin header.
| Pin | Description |
| 1 | VCC_IO(3.3V) |
| 2 | GND |
| 3 | SPI_CS0# |
| 4 | SPI_CLK |
| 5 | SPI_MOSI |
| 6 | SPI_MISO |
I2C (CN22)
RSB-4680 provides one I2C pin header.
| Pin |
Description |
| 1 | +3.3V |
| 2 | GND |
| 3 | Touch_INT# |
| 4 | I2C4_SCL |
| 5 | NC |
| 6 | I2C4_SDA |
