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Contents
Mezzanine ConnectorsEdit
DescriptionEdit
RIALTO SBC has two mezzanine expansion connectors: J60 and J61.
J60 is a 10x1x2.54mm pin strip header connector.
J61 is a 10x1x2.54mm pin strip header connector.
SignalsEdit
The following table describes the interface signals:
- J60
| Pin# | Pin name | Alternate function | GPIO | Pin notes |
|---|---|---|---|---|
| 1 | UART2_RX_DATA | I2C4_SDA, ECSPI3_SCLK | GPIO1_IO21 | |
| 2 | UART2_RTS | FLEXCAN2_RX, ECSPI3_MISO | GPIO1_IO23 | |
| 3 | UART2_TX_DATA | I2C4_SCL, ECSPI3_SS0 | GPIO1_IO20 | |
| 4 | UART2_CTS | FLEXCAN2_TX, ECSPI3_MOSI | GPIO1_IO22 | |
| 5 | UART5_TX_DATA | I2C2_SCL | GPIO1_IO30 | |
| 6 | UART5_RX_DATA | I2C2_SDA | GPIO1_IO31 | |
| 7 | MEZZANINE_GP0 | GPIO3_IO24 or GPIO4_IO25 | LCD_DATA19 or CSI_DATA04 mounting options | |
| 8 | MEZZANINE_GP1 | GPIO3_IO27 or GPIO4_IO26 | LCD_DATA22 or CSI_DATA05 mounting options | |
| 9 | MEZZANINE_GP2 | GPIO3_IO28 or GPIO4_IO27 | LCD_DATA23 or CSI_DATA06 mounting options | |
| 10 | DGND | Ground |
- J61
| Pin# | Pin name | Alternate function | GPIO | Pin notes |
|---|---|---|---|---|
| 1 | VIN | |||
| 2 | PMIC_5V | |||
| 3 | 3V3_AUX | |||
| 4 | VDD_ADC | |||
| 5 | GPIO1_IO01 | WDOG1_WDOG_B | GPIO1_IO01 | |
| 6 | GPIO1_IO02 | I2C1_SCL | GPIO1_IO02 | |
| 7 | GPIO1_IO03 | I2C1_SDA | GPIO1_IO03 | |
| 8 | GPIO1_IO04 | UART5_TX, PWM3 | GPIO1_IO04 | |
| 9 | GPIO1_IO05 | UART5_RX, PWM4 | GPIO1_IO05 | |
| 10 | DGND | Ground |
All the GPIO signals are 0-3.3V level.
Device mappingEdit
UARTEdit
- UART2 and it is mapped to
/dev/ttymxc1device in Linux - UART5 and it is mapped to
/dev/ttymxc4device in Linux
GPIOEdit
GPIOs are mapped into banks each of which contains 32 pins. They are named as GPIO<bank>_IO<pin>
Each pin can be addressed with an incremental number, calculated as follows: GPIO = 32 x (<bank> - 1) + <pin>
Device usageEdit
UARTEdit
UART peripherals use standard Linux protocols.
I2CEdit
I2C buses can be used with i2ctools (at userspace) or accessing the related /dev/i2c-x device in Linux.
SPIEdit
SPI peripherals use standard spidev kernel interface.
PWMEdit
The PWM driver is accessed via sysfs in user space
GPIOEdit
Under Linux the GPIOs can be manipulated su sysfs export or with the gpiod tools in Linux.