RIALTO SBC/Interfaces and Connectors/Mezzanine
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Contents
Mezzanine Connectors[edit | edit source]
Description[edit | edit source]
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.
Signals[edit | edit source]
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 mapping[edit | edit source]
UART[edit | edit source]
- UART2 and it is mapped to
/dev/ttymxc1device in Linux - UART5 and it is mapped to
/dev/ttymxc4device in Linux
GPIO[edit | edit source]
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 usage[edit | edit source]
UART[edit | edit source]
UART peripherals use standard Linux protocols.
I2C[edit | edit source]
I2C buses can be used with i2ctools (at userspace) or accessing the related /dev/i2c-x device in Linux.
SPI[edit | edit source]
SPI peripherals use standard spidev kernel interface.
PWM[edit | edit source]
The PWM driver is accessed via sysfs in user space
GPIO[edit | edit source]
Under Linux the GPIOs can be manipulated su sysfs export or with the gpiod tools in Linux.
