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Diffstat (limited to 'source/gpio.rst')
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diff --git a/source/gpio.rst b/source/gpio.rst index 0f9f4df..74be3d4 100644 --- a/source/gpio.rst +++ b/source/gpio.rst @@ -3,86 +3,54 @@ GPIO ==== -.. FIXME [Maple-specific values] +Each LeafLabs board comes with ready-to-use General Purpose +Input/Output (GPIO) pins, which are numbered starting from zero. +These numbers are listed on your board's silkscreen, next to where the +pin is broken out to a header. Many pins may additionally be used for +special features or peripheral functions. -The Maple features 38 ready-to-use general purpose input/output (GPIO) -pins for digital input/output, numbered D0 through D37. These numbers -correspond to the numeric values next to each header on the Maple -silkscreen. +.. contents:: Contents + :local: -Many of these pins may additionally be used for special features or -peripheral functions. This page documents those capabilities, by pin. +.. _gpio-pin-maps: -The current and voltage limitations have been copied over from the -STM32 datasheet (see the :ref:`Recommended Reading -<gpio-recommended-reading>` for a link). In particular, a number of -GPIO pins are 5V tolerant (which means that applying 5 volts to a pin -and reading it as input or allowing it to drain to ground will not -damage that pin), while some are not. +Pin Maps +-------- -.. contents:: Contents - :local: +The hardware documentation for your board lists each pin's +capabilities, by pin number: + +.. TODO [0.1.0] Uncomment Mini and Native GPIO links + +* :ref:`Maple <maple-gpios>` +* :ref:`Maple RET6 Edition <maple-ret6-gpios>` -.. _pin-mapping-mega-table: - -Pin Mapping Mega Table ----------------------- - -This table shows the available functionality on every GPIO pin, by -peripheral type. The "STM32" column refers to the port and number that -the header is connected to on the microcontroller. The "5V?" column -documents whether or not the pin is 5 volt tolerant (see above). - -.. TODO silkscreen pictures which let you know what each abbreviation -.. means, with links to the relevant documentation. - -.. csv-table:: - :header: "Pin", "STM32", ":ref:`ADC <adc>`", ":ref:`Timer <timers>`", ":ref:`I2C <i2c>`", ":ref:`UART <usart>`", ":ref:`SPI <spi>`", "5v?" - - "D0", "PA3", "ADC3", "TIM2_CH4", "-", "USART2_RX", "-", "No" - "D1", "PA2", "ADC2", "TIM2_CH3", "-", "USART2_TX", "-", "No" - "D2", "PA0", "ADC0", "TIM2_CH1_ETR", "-", "USART2_CTS", "-", "No" - "D3", "PA1", "ADC1", "TIM2_CH2", "-", "USART2_RTS", "-", "No" - "D4", "PB5", "-", "-", "ISC1_SMBA", "-", "-", "No" - "D5", "PB6", "-", "TIM4_CH1", "I2C1_SCL", "-", "-", "Yes" - "D6", "PA8", "-", "TIM1_CH1", "-", "USART1_CK", "-", "Yes" - "D7", "PA9", "-", "TIM1_CH2", "-", "USART1_TX", "-", "Yes" - "D8", "PA10", "-", "TIM1_CH3", "-", "USART1_RX", "-", "Yes" - "D9", "PB7", "-", "TIM4_CH2", "I2C1_SDA", "-", "-", "Yes" - "D10", "PA4", "ADC4", "-", "-", "USART2_CK", "SPI1_NSS", "No" - "D11", "PA7", "ADC7", "TIM3_CH2", "-", "-", "SPI1_MOSI", "No" - "D12", "PA6", "ADC6", "TIM3_CH1", "-", "-", "SPI1_MISO", "No" - "D13", "PA5", "ADC5", "-", "-", "-", "SPI1_SCK", "No" - "D14", "PB8", "-", "TIM4_CH3", "-", "-", "-", "Yes" - "D15", "PC0", "ADC10", "-", "-", "-", "-", "No" - "D16", "PC1", "ADC11", "-", "-", "-", "-", "No" - "D17", "PC2", "ADC12", "-", "-", "-", "-", "No" - "D18", "PC3", "ADC13", "-", "-", "-", "-", "No" - "D19", "PC4", "ADC14", "-", "-", "-", "-", "No" - "D20", "PC5", "ADC15", "-", "-", "-", "-", "No" - "D21", "PC13", "-", "-", "-", "-", "-", "No" - "D22", "PC14", "-", "-", "-", "-", "-", "No" - "D23", "PC15", "-", "-", "-", "-", "-", "No" - "D24", "PB9", "-", "TIM4_CH4", "-", "-", "-", "Yes" - "D25", "PD2", "-", "TIM3_ETR", "-", "-", "-", "Yes" - "D26", "PC10", "-", "-", "-", "-", "-", "Yes" - "D27", "PB0", "ADC8", "TIM3_CH3", "-", "-", "-", "No" - "D28", "PB1", "ADC9", "TIM3_CH4", "-", "-", "-", "No" - "D29", "PB10", "-", "-", "I2C2_SCL", "USART3_TX", "-", "Yes" - "D30", "PB11", "-", "-", "I2C2_SDA", "USART3_RX", "-", "Yes" - "D31", "PB12", "-", "TIM1_BKIN", "I2C2_SMBAL", "USART3_CK", "SPI2_NSS", "Yes" - "D32", "PB13", "-", "TIM1_CH1N", "-", "USART3_CTS", "SPI2_SCK", "Yes" - "D33", "PB14", "-", "TIM1_CH2N", "-", "USART3_RTS", "SPI2_MISO", "Yes" - "D34", "PB15", "-", "TIM1_CH3N", "-", "-", "SPI2_MOSI", "Yes" - "D35", "PC6", "-", "-", "-", "-", "-", "Yes" - "D36", "PC7", "-", "-", "-", "-", "-", "Yes" - "D37", "PC8", "-", "-", "-", "-", "-", "Yes" +.. * :ref:`Maple Mini <maple-mini-gpios>` +.. * :ref:`Maple Native <maple-native-gpios>` + +The current and voltage limitations were determined using the STM32 +datasheets. In particular, only some GPIO pins are **5V tolerant**, +which means that applying 5 volts to a pin and reading it as input or +allowing it to drain to ground will not damage that pin. Connecting a +voltage higher than 3.3V to a non-5V tolerant pin may damage your +board. .. _gpio-modes: GPIO Modes ---------- +Each of the GPIO pins on a Maple board may be configured using +pinMode() to behave in a number of ways: as a digital output pin, +or as an analog input pin, etc., depending on the particular pin. + +A ``WiringPinMode`` value specifies the complete set of possible +configurations; not every pin can have all of these modes. For +example, on the Maple, pin 15 may have mode ``INPUT_ANALOG``, but not +``PWM``. See your :ref:`board's pin maps <gpio-pin-maps>` and its +silkscreen for more information on what functionality is available on +each pin. + .. doxygenenum:: WiringPinMode Function Reference @@ -105,7 +73,11 @@ Function Reference Recommended Reading ------------------- -STMicro documentation for STM32F103RB microcontroller: +* ST Documentation for the STM32F103 series of microcontrollers: - * `Datasheet <http://www.st.com/stonline/products/literature/ds/13587.pdf>`_ (pdf) * `Reference Manual <http://www.st.com/stonline/products/literature/rm/13902.pdf>`_ (pdf) + + * `Programming Manual + <http://www.st.com/stonline/products/literature/pm/15491.pdf>`_ + (PDF; assembly language and register reference) + |