GPIO Pins
GPIO Header
The 40-pin GPIO Header on MistyCarrier can be configured to expose different MistySOM functionalities including IIC, SPI or USART. The below table indicates the functionalities of each pin:
The column func0 indicates the default mux setting on the pin.
| func5 | func1 | func0 | desc | pin# | pin# | desc | func0 | func1 |
|---|---|---|---|---|---|---|---|---|
| 5V | 1 | 2 | 3.3V | |||||
| 1.8V | 3 | 4 | GND | |||||
| GND | 5 | 6 | 1.2V | |||||
| RIIC1_SDA | dedicated IIC | 7 | 8 | GND | ||||
| RIIC1_SCL | dedicated IIC | 9 | 10 | 2.5V | ||||
| RIIC2_SDA | P42_3 | 3.3V GPIO | 11 | 12 | GND | |||
| RIIC2_SCL | P42_4 | 3.3V GPIO | 13 | 14 | GND | |||
| NMI | input | 15 | 16 | Analog | ADC_CH0 | |||
| GND | 17 | 18 | Analog | ADC_CH1 | ||||
| shared with BLE | SCIF2_TXD | P48_0 | 3.3V GPIO | 19 | 20 | Analog | ADC_CH2 | |
| shared with BLE | SCIF2_RXD | P48_1 | 3.3V GPIO | 21 | 22 | Analog | ADC_CH3 | |
| shared with BLE | SCIF2_CTS | P48_3 | 3.3V GPIO | 23 | 24 | Analog | ADC_CH4 | |
| shared with BLE | SCIF2_RTS | P48_4 | 3.3V GPIO | 25 | 26 | Analog | ADC_CH5 | |
| GND | 27 | 28 | Analog | ADC_CH6 | ||||
| GND | 29 | 30 | Analog | ADC_CH7 | ||||
| GND | 31 | 32 | GND | |||||
| SCIF3_TXD | P0_0 | 3.3V GPIO | 33 | 34 | 3.3V GPIO | P43_0 | RSPI0_CK | |
| SCIF3_RXD | P0_1 | 3.3V GPIO | 35 | 36 | 3.3V GPIO | P43_1 | SPI0_MOSI | |
| SCIF3_SCK | P1_0 | 3.3V GPIO | 37 | 38 | 3.3V GPIO | P43_2 | SPI0_MISO | |
| GND | 39 | 40 | 3.3V GPIO | P43_3 | RSPI0_SSL |
GPIO Pads
Further GPIOs on MistyCarrier are available and accessible via through-hole pads between the RTC battery holder BT1 and the MistySOM connector J38 as shown in the picture below:
The column func0 indicates the default mux setting on the pin.
| pad# | desc | func0 | func1 | func2 | func3 |
|---|---|---|---|---|---|
| TP39 | DISP_DATA0 | P7_2 | DISP_DATA0 | ||
| TP40 | DISP_DATA1 | P8_0 | DISP_DATA1 | ||
| TP41 | DISP_DATA2 | P8_1 | DISP_DATA2 | ||
| TP42 | DISP_DATA3 | P8_2 | DISP_DATA3 | ||
| TP43 | DISP_DATA4 | P9_0 | DISP_DATA4 | ||
| TP44 | DISP_DATA5 | P9_1 | DISP_DATA5 | ||
| TP45 | DISP_DATA6 | P10_0 | DISP_DATA6 | ||
| TP46 | DISP_DATA7 | P10_1 | DISP_DATA7 | CAN0_TX | |
| TP47 | DISP_DATA8 | P11_0 | DISP_DATA8 | CAN0_RX | |
| TP48 | DISP_DATA9 | P11_1 | DISP_DATA9 | ||
| TP49 | DISP_DATA10 | P12_0 | DISP_DATA10 | ||
| TP50 | DISP_DATA11 | P12_1 | DISP_DATA11 | ||
| TP51 | DISP_DATA12 | P13_0 | DISP_DATA12 | ||
| TP52 | DISP_DATA13 | P13_1 | DISP_DATA13 | ||
| TP53 | DISP_DATA14 | P13_2 | DISP_DATA14 | IRQ 7 | |
| TP54 | DISP_DATA15 | P14_0 | DISP_DATA15 | ||
| TP55 | DISP_DATA16 | P14_1 | DISP_DATA16 | ||
| TP56 | DISP_DATA17 | P15_0 | DISP_DATA17 | ||
| TP57 | DISP_DATA18 | P15_1 | DISP_DATA18 | ||
| TP58 | DISP_DATA19 | P16_0 | DISP_DATA19 | IRQ 3 | |
| TP59 | DISP_DATA20 | P16_1 | DISP_DATA20 | IRQ 4 | |
| TP60 | DISP_DATA21 | P17_0 | DISP_DATA21 | IRQ 5 | |
| TP61 | DISP_DATA22 | P17_1 | DISP_DATA22 | IRQ 6 | |
| TP62 | DISP_DATA23 | P17_2 | DISP_DATA23 | ||
| TP63 | DISP_CLK | P6_0 | DISP_CLK | ||
| TP64 | DISP_DE | P7_1 | DISP_DE | ||
| TP65 | DISP_HSYNC | P6_1 | DISP_HSYNC | ||
| TP56 | DISP_VSYNC | P7_0 | DISP_VSYNC |
documentation about GPIO usage can be found here