83 lines
3.0 KiB
ReStructuredText
83 lines
3.0 KiB
ReStructuredText
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=========
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OMNIBUSF4
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=========
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"OmnibusF4" is not a product name per se, but rather a design spec
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that many product vendors within the drone flight management unit
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(FMU) community adhere to. The spec defines the major components, and
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how those components are wired into the STM32F405RGT6 microcontroller.
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Airbot is one such vendor, and they publish a schematic here:
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http://bit.ly/obf4pro
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Other software that supports the OmnibusF4 family include Betaflight,
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iNAV, and many others. PX4 recently added support as well. No code
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from any of those sources is included in this port.
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Since OmnibusF4 is a drone FMU, most of its IO is already allocated to
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FMU-specific tasks. As such, we don't need to make the board support
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package as flexible as, say, an STM32F4 Discovery board.
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..
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The following are some of the committed IO pins. Most of the pins not
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mentioned here are inaccessible, the details vary by board vendor:
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io peripheral signal notes
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==================================
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XIN 8MHz crystal oscillator
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PB0 TIM3 CH3 S1_OUT motor 1 PWM output
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PB1 TIM3 CH4 S2_OUT motor 2 PWM output
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PA3 TIM2 CH4 S3_OUT motor 3 PWM output
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PA2 TIM2 CH3 S4_OUT motor 4 PWM output
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PA1 TIM2 CH2 S5_OUT motor 5 PWM output
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PA8 TIM1 CH4 S6_OUT motor 6 PWM output
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PA4 SPI1 SPI1_NSS mpu6000
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PA5 SPI1 SPI1_SCL
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PA6 SPI1 SPI1_MISO
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PA7 SPI1 SPI1_MOSI
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PC4 GPIO GYRO_INT mpu6000 EXTI
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PB10 UART3/I2C UART3_TX ttl UART tx or i2c_scl (used as console)
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PB11 UART3/I2C UART3_RX ttl UART rx or i2c_sda (used as console)
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PB9 RC_CH2 (rx pwm input)
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PB8 RC_CH1 (rx pwm input)
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PC9 RC_CH6 (rx pwm input)
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PC8 RC_CH5 (rx pwm input)
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PC7 RC_CH4 or USART6_RX (ttl)
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PC6 RC_CH3 or USART6_TX (ttl)
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PB7 GPIO SD_DET SD card detection pin (low when card inserted)
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PB5 GPIO STAT LED output (active low)
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PB4 GPIO BUZZER buzzer output (active low)
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PD2 GPIO LED_STRIP one-wire interface for LED strips
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PC12 SPI3 SPI3_MOSI bmp280 barometer (if populated) and/or max7456 OSD
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PC11 SPI3 SPI3_MISO
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PC10 SPI3 SPI3_SCL
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PA15 GPIO SPI3_NSS OSD NSS
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PB3 GPIO BARO_CS bmp280 NSS (if populated)
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PA12 OTG USB_DP
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PA11 OTG USB_DN
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PA10 UART1 USART1_RX SBUS_IN (through inverter) or PPM
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PA9 UART1 USART1_TX
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PB15 SPI2 SPI2_MOSI sd/mmc card interface
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PB14 SPI2 SPI2_MISO
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PB13 SPI2 SPI2_SCLK
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PB12 SPI2 SPI2_NSS
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Build Instructions
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==================
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The boards/arm/stm32/omnibusf4/nsh/defconfig file creates a basic setup, and
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includes drivers for all supported onboard chips. The console and
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command prompt are sent to USART3.
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