Docs: fix and standardize Maple and RET6 hardware pages.

Pick a standard layout for the information and fix mistakes.  Looks
like some of these errors were copy-pasted in from the old HTML
documentation, some crept in due to API changes, and some were just
wrong.

I've checked all the claims against the datasheets and source code, so
we should be in good shape now.

1 files changed, 179 insertions, 128 deletions

diff --git a/docs/source/hardware/maple-ret6.rst b/docs/source/hardware/maple-ret6.rst
index 9ee46d2..2f636d7 100644
--- a/docs/source/hardware/maple-ret6.rst
+++ b/docs/source/hardware/maple-ret6.rst
@@ -5,56 +5,60 @@
 Maple RET6 Edition
 ==================
 
+This page is a general resource for information specific to the Maple
+RET6 Edition.  The Maple RET6 Edition is a "beta" board released as a
+simple way to get a more powerful chip than the one on the base Maple
+(the STM32F103RET6, hence the name) in the hands of Maple developers.
+
 .. contents:: Contents
    :local:
 
+.. TODO [dma.rst] Ref to dma.rst in sequel instead of libmaple-dma
+.. TODO [dac.rst] Ref to dac.rst in sequel instead of libmaple-dac
+.. TODO [nvic.rst] Ref to nvic.rst in sequel
+
 Technical Specifications
 ------------------------
 
-    * MCU: **STM32F103RET6**, a 32-bit ARM Cortex M3 microprocessor
-    * Clock Speed: **72 MHz**
-    * **512KB Flash** and **64KB SRAM**
-    * 43 Digital I/O Pins (:ref:`GPIO <gpio>`)
-    * 16 Analog Input pins, 12 bit **ADC** resolution (:ref:`ADC
-      <adc>`)
-    * Built-in, 2 channel **DAC** at 12 bit resolution
-      (:ref:`libmaple-dac`).
-    * 19 **PWM** pins at 16-bit resolution (:ref:`PWM <pwm>`)
-    * Dedicated **USB** port for programming and communications
-      (:ref:`USB<usb>`)
-    * External **JTAG** interface (:ref:`JTAG <jtag>`)
-    * 64 Channel nested vector interrupt handler (including
-      :ref:`external interrupt <lang-attachinterrupt>` on GPIOs)
-    * Integrated **SPI** (:ref:`SPI <spi>`)
-    * Integrated **SDIO**
-    * Integrated **I2C** and **I2S** (:ref:`I2C <i2c>`)
-    * 12 Channels of Direct Memory Access (**DMA**)
-      (:ref:`libmaple-dma`)
-    * 3 **USART** and 2 **UART** devices (:ref:`USART <usart>`)
-    * Two advanced control, four general purpose, two basic **timers**
-      (:ref:`timers`)
-    * Supplies up to 500mA @ 3.3v (with separate 250 mA digital and
-      analog regulators)
-    * Support for low power, sleep, and standby modes (<500uA)
-    * Operating Voltage: 3.3V
-    * Input Voltage (recommended): 3V-12V
-    * Dimensions are 2.05″x2.1″
+* MCU: **STM32F103RET6**, a 32-bit ARM Cortex M3 microprocessor
+* Clock Speed: **72 MHz**
+* **512 KB Flash** and **64 KB SRAM**
+* 43 Digital I/O Pins (:ref:`gpio`)
+* 18 **PWM** pins at 16 bit resolution (:ref:`pwm`)
+* 15 analog input pins, 12 bit **ADC** resolution (:ref:`adc`)
+* Built-in, 2 channel **DAC** at 12 bit resolution (:ref:`libmaple-dac`).
+* 2 **SPI** peripherals with **I2S** support (:ref:`spi`)
+* 2 **I2C** peripherals (:ref:`i2c`)
+* 12 Channels of Direct Memory Access (**DMA**)
+  (:ref:`libmaple-dma`) with 2 DMA controllers
+* 3 **USART** devices (:ref:`usart`)
+* 2 advanced, 4 general-purpose, and 2 basic **timers** (:ref:`timers`)
+* Dedicated **USB** port for programming and communications (:ref:`usb`)
+* **JTAG** (:ref:`jtag`)
+* Nested Vectored Interrupt Controller (NVIC) (including
+  :ref:`external interrupt <lang-attachinterrupt>` on GPIOs)
+* Supplies up to 500 mA at 3.3 V, with :ref:`separate 250 mA digital
+  and analog regulators <maple-ret6-adc-bank>` for low-noise analog
+  performance
+* :ref:`Four layer design <maple-ret6-hardware>`
+* Support for low power, sleep, and standby modes (<500 μA)
+* Operating Voltage: 3.3 V
+* Input Voltage (recommended): 4 V — 12 V
+* Dimensions are 2.05″ × 2.1″
 
 .. _maple-ret6-powering:
 
 Powering the Maple RET6 Edition
 -------------------------------
 
-The Maple RET6 Edition's power source is determined by the header to
-the left of the "LeafLabs" label on the silkscreen.  The RET6 Edition
-can be powered from the barrel jack connector, USB, or a LiPo battery.
-We ship the RET6 Edition with a jumper on the USB selector.  In order
-to power it off of an alternative source, unplug the board, then move
-the jumper to the desired selector before reconnecting power.
+The Maple RET6 Edition is powered in the :ref:`same way as the
+standard Maple <maple-powering>`.
 
-You can also power the Maple via the pin labeled "Vin" on the lower
-header.  However, don't do this while simultaneously powering the
-board from another source, or you could damage the board.
+.. warning:: The RET6 Edition silkscreen falsely indicates that the
+   barrel jack accepts up to 18 V.  We recommend a barrel jack input
+   voltage **no greater than 12 V**.
+
+   See :ref:`this erratum <maple-barrel-jack>` for more information.
 
 Using the Built-in Battery Charger
 ----------------------------------
@@ -84,7 +88,8 @@ It is thus mainly useful as an :ref:`input <lang-pin-levels>`.  The
 pin will :ref:`read <lang-digitalread>` ``HIGH`` when the :ref:`button
 is pressed <lang-isbuttonpressed>`.
 
-More GPIOs (numbered ``D39``\ --``D42``) are available if you use the
+More GPIOs (numbered ``D39``\ --``D42`` on the back of the RET6
+Edition's silkscreen) are available if you use the
 :ref:`lang-disabledebugports` function; see the :ref:`board-specific
 debug pin constants <lang-board-values-debug>` for more information.
 (See :ref:`this erratum <maple-ret6-nrst-pb4>` for information about
@@ -97,57 +102,58 @@ the pin numbered ``43`` on the silkscreen).
 Master Pin Map
 ^^^^^^^^^^^^^^
 
-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.
+This table shows a summary of the available functionality on every
+GPIO pin, by peripheral type.  The "5 V?" column documents whether or
+not the pin is 5 volt tolerant.
 
 .. 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,  -,         -
-   D1,  PA2,  ADC2,  TIM2_CH3,     -,          USART2_TX,  -,         -
-   D2,  PA0,  ADC0,  TIM2_CH1_ETR, -,          USART2_CTS, -,         -
-   D3,  PA1,  ADC1,  TIM2_CH2,     -,          USART2_RTS, -,         -
-   D4,  PB5,  -,     -,            ISC1_SMBA,  -,          SPI3_MOSI, -
-   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,  -
-   D11, PA7,  ADC7,  TIM3_CH2,     -,          -,          SPI1_MOSI, -
-   D12, PA6,  ADC6,  TIM3_CH1,     -,          -,          SPI1_MISO, -
-   D13, PA5,  ADC5,  -,            -,          -,          SPI1_SCK,  -
-   D14, PB8,  -,     TIM4_CH3,     -,          -,          -,         Yes
-   D15, PC0,  ADC10, -,            -,          -,          -,         -
-   D16, PC1,  ADC11, -,            -,          -,          -,         -
-   D17, PC2,  ADC12, -,            -,          -,          -,         -
-   D18, PC3,  ADC13, -,            -,          -,          -,         -
-   D19, PC4,  ADC14, -,            -,          -,          -,         -
-   D20, PC5,  ADC15, -,            -,          -,          -,         -
-   D21, PC13, -,     -,            -,          -,          -,         -
-   D22, PC14, -,     -,            -,          -,          -,         -
-   D23, PC15, -,     -,            -,          -,          -,         -
-   D24, PB9,  -,     TIM4_CH4,     -,          -,          -,         Yes
-   D25, PD2,  -,     TIM3_ETR,     -,          -,          UART5_RX,  Yes
-   D26, PC10, -,     -,            -,          -,          UART4_TX,  Yes
-   D27, PB0,  ADC8,  TIM3_CH3,     -,          -,          -,         -
-   D28, PB1,  ADC9,  TIM3_CH4,     -,          -,          -,         -
-   D29, PB10, -,     -,            I2C2_SCL,   USART3_TX,  -,         Yes
-   D30, PB11, -,     -,            I2C2_SDA,   USART3_RX,  -,         Yes
-   D31, PB12, -,     TIM1_BKIN,    I2C2_SMBA,  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,  -,     TIM8_CH1,     -,          -,          -,         Yes
-   D36, PC7,  -,     TIM8_CH2,     -,          -,          -,         Yes
-   D37, PC8,  -,     TIM8_CH3,     -,          -,          -,         Yes
-   D38, PC9,  -,     TIM8_CH4,     -,          -,          -,         Yes
-   D39, PA13, -,     -,            -,          -,          -,         Yes
-   D40, PA14, -,     -,            -,          -,          -,         Yes
-   D41, PA15, -,     -,            -,          -,          SPI3_NSS,  Yes
-   D42, PB3,  -,     -,            -,          -,          SPI3_SCK,  Yes
+   :header: Pin, :ref:`GPIO <gpio>`, :ref:`ADC <adc>`, :ref:`Timer <timers>`, :ref:`I2C <i2c>`, :ref:`UART/USART <usart>`, :ref:`SPI <spi>`, 5 V?
+
+   D0,  PA3,  CH3,  2_CH4,     -,       2_RX,  -,      -
+   D1,  PA2,  CH2,  2_CH3,     -,       2_TX,  -,      -
+   D2,  PA0,  CH0,  2_CH1_ETR, -,       2_CTS, -,      -
+   D3,  PA1,  CH1,  2_CH2,     -,       2_RTS, -,      -
+   D4,  PB5,  -,    -,         1_SMBA,  -,     3_MOSI, -
+   D5,  PB6,  -,    4_CH1,     1_SCL,   -,     -,      Yes
+   D6,  PA8,  -,    1_CH1,     -,       1_CK,  -,      Yes
+   D7,  PA9,  -,    1_CH2,     -,       1_TX,  -,      Yes
+   D8,  PA10, -,    1_CH3,     -,       1_RX,  -,      Yes
+   D9,  PB7,  -,    4_CH2,     1_SDA,   -,     -,      Yes
+   D10, PA4,  CH4,  -,         -,       2_CK,  1_NSS,  -
+   D11, PA7,  CH7,  3_CH2,     -,       -,     1_MOSI, -
+   D12, PA6,  CH6,  3_CH1,     -,       -,     1_MISO, -
+   D13, PA5,  CH5,  -,         -,       -,     1_SCK,  -
+   D14, PB8,  -,    4_CH3,     -,       -,     -,      Yes
+   D15, PC0,  CH10, -,         -,       -,     -,      -
+   D16, PC1,  CH11, -,         -,       -,     -,      -
+   D17, PC2,  CH12, -,         -,       -,     -,      -
+   D18, PC3,  CH13, -,         -,       -,     -,      -
+   D19, PC4,  CH14, -,         -,       -,     -,      -
+   D20, PC5,  CH15, -,         -,       -,     -,      -
+   D21, PC13, -,    -,         -,       -,     -,      -
+   D22, PC14, -,    -,         -,       -,     -,      -
+   D23, PC15, -,    -,         -,       -,     -,      -
+   D24, PB9,  -,    4_CH4,     -,       -,     -,      Yes
+   D25, PD2,  -,    3_ETR,     -,       -,     5_RX,   Yes
+   D26, PC10, -,    -,         -,       -,     4_TX,   Yes
+   D27, PB0,  CH8,  3_CH3,     -,       -,     -,      -
+   D28, PB1,  CH9,  3_CH4,     -,       -,     -,      -
+   D29, PB10, -,    -,         2_SCL,   3_TX,  -,      Yes
+   D30, PB11, -,    -,         2_SDA,   3_RX,  -,      Yes
+   D31, PB12, -,    1_BKIN,    2_SMBA,  3_CK,  2_NSS,  Yes
+   D32, PB13, -,    1_CH1N,    -,       3_CTS, 2_SCK,  Yes
+   D33, PB14, -,    1_CH2N,    -,       3_RTS, 2_MISO, Yes
+   D34, PB15, -,    1_CH3N,    -,       -,     2_MOSI, Yes
+   D35, PC6,  -,    8_CH1,     -,       -,     -,      Yes
+   D36, PC7,  -,    8_CH2,     -,       -,     -,      Yes
+   D37, PC8,  -,    8_CH3,     -,       -,     -,      Yes
+   D38, PC9,  -,    8_CH4,     -,       -,     -,      Yes
+   D39, PA13, -,    -,         -,       -,     -,      Yes
+   D40, PA14, -,    -,         -,       -,     -,      Yes
+   D41, PA15, -,    -,         -,       -,     3_NSS,  Yes
+   D42, PB3,  -,    -,         -,       -,     3_SCK,  Yes
+
+.. _maple-ret6-timer-map:
 
 Timer Pin Map
 ^^^^^^^^^^^^^
@@ -188,7 +194,7 @@ The following table shows which pins connect to which :ref:`EXTI lines
    * - EXTI2
      - 1, 17, 25
    * - EXTI3
-     - 0, 18
+     - 0, 18, 42
    * - EXTI4
      - 10, 19
    * - EXTI5
@@ -208,11 +214,11 @@ The following table shows which pins connect to which :ref:`EXTI lines
    * - EXTI12
      - 31
    * - EXTI13
-     - 21, 32
+     - 21, 32, 39
    * - EXTI14
-     - 22, 33
+     - 22, 33, 40
    * - EXTI15
-     - 23, 34
+     - 23, 34, 41
 
 .. _maple-ret6-usart-map:
 
@@ -220,9 +226,8 @@ USART Pin Map
 ^^^^^^^^^^^^^
 
 The Maple RET6 Edition has three serial ports whose pins are broken
-out to headers (also known as a UARTs or USARTs): ``Serial1``,
-``Serial2``, and ``Serial3``. They communicate using the pins
-summarized in the following table:
+out to headers (also known as :ref:`USARTs <usart>`). They communicate
+using the pins summarized in the following table:
 
 .. csv-table::
    :header: Serial Port, TX, RX, CK, CTS, RTS
@@ -233,7 +238,18 @@ summarized in the following table:
    ``Serial3`` | 29 | 30 | 31 | 32 | 33
 
 Unfortunately, :ref:`UART4 and UART5 aren't completely available
-<maple-ret6-uart-errata>`.
+<maple-ret6-uarts>`.
+
+.. _maple-ret6-adc-bank:
+
+Low-Noise ADC Pins
+^^^^^^^^^^^^^^^^^^
+
+The six pins at the bottom right of the board (D15—D20) generally
+offer lower-noise ADC performance than other pins on the board. If
+you’re concerned about getting good ADC readings, we recommend using
+one of these pins to take your measurements.  More details in the
+:ref:`Maple hardware documentation <maple-adc-bank>`.
 
 Board-Specific Values
 ---------------------
@@ -244,24 +260,28 @@ values <lang-board-values>`.
 - ``CYCLES_PER_MICROSECOND``: 72
 - ``BOARD_BUTTON_PIN``: 38
 - ``BOARD_LED_PIN``: 13
-- ``BOARD_NR_GPIO_PINS``: 44
-- ``BOARD_NR_PWM_PINS``: 16
-- ``boardPWMPins``: 0, 1, 2, 3, 5, 6, 7, 8, 9, 11, 12, 14, 24, 25, 27, 28
+- ``BOARD_NR_GPIO_PINS``: 44 (however, :ref:`pin D43 is not usable
+  <maple-nrst-pb4>`)
+- ``BOARD_NR_PWM_PINS``: 18
+- ``boardPWMPins``: 0, 1, 2, 3, 5, 6, 7, 8, 9, 11, 12, 14, 24, 27, 28,
+  35, 36, 37
 - ``BOARD_NR_ADC_PINS``: 15
-- ``boardADCPins``: 0, 1, 2, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 27, 28
+- ``boardADCPins``: 0, 1, 2, 3, 10, 11, 12, 15, 16, 17, 18, 19, 20, 27, 28
 - ``BOARD_NR_USED_PINS``: 7
 - ``boardUsedPins``: ``BOARD_LED_PIN``, ``BOARD_BUTTON_PIN``,
   ``BOARD_JTMS_SWDIO_PIN``, ``BOARD_JTCK_SWCLK_PIN``,
   ``BOARD_JTDI_PIN``, ``BOARD_JTDO_PIN``, ``BOARD_NJTRST_PIN``
-- ``BOARD_NR_USARTS``: 3 (unfortunately, due to the Maple Rev 5
-  design, UARTs 4 and 5 have pins which are not broken out)
+- ``BOARD_NR_USARTS``: 3 (unfortunately, :ref:`due to the Maple Rev 5
+  design <maple-ret6-uarts>`, UARTs 4 and 5 have pins which are not
+  broken out).
 - ``BOARD_USART1_TX_PIN``: 7
 - ``BOARD_USART1_RX_PIN``: 8
 - ``BOARD_USART2_TX_PIN``: 1
 - ``BOARD_USART2_RX_PIN``: 0
 - ``BOARD_USART3_TX_PIN``: 29
 - ``BOARD_USART3_RX_PIN``: 30
-- ``BOARD_NR_SPI``: 3
+- ``BOARD_NR_SPI``: 2 (unfortunately, :ref:`due to the Maple Rev 5
+  design <maple-ret6-nrst-pb4>`, SPI3 is unavailable).
 - ``BOARD_SPI1_NSS_PIN``: 10
 - ``BOARD_SPI1_MOSI_PIN``: 11
 - ``BOARD_SPI1_MISO_PIN``: 12
@@ -270,21 +290,19 @@ values <lang-board-values>`.
 - ``BOARD_SPI2_MOSI_PIN``: 34
 - ``BOARD_SPI2_MISO_PIN``: 33
 - ``BOARD_SPI2_SCK_PIN``: 32
-- ``BOARD_SPI3_NSS_PIN``: 41
-- ``BOARD_SPI3_MOSI_PIN``: 4
-- ``BOARD_SPI3_MISO_PIN``: 43
-- ``BOARD_SPI3_SCK_PIN``: 42
 - ``BOARD_JTMS_SWDIO_PIN``: 39
 - ``BOARD_JTCK_SWCLK_PIN``: 40
 - ``BOARD_JTDI_PIN``: 41
 - ``BOARD_JTDO_PIN``: 42
-- ``BOARD_NJTRST_PIN``: 43
+- ``BOARD_NJTRST_PIN``: :ref:`43 <maple-ret6-nrst-pb4>`
+
+.. _maple-ret6-hardware:
 
 Hardware Design Files
 ---------------------
 
 The hardware schematics and board layout files are available in the
-`Maple Github repository <https://github.com/leaflabs/maple>`_.  Other
+`Maple GitHub repository <https://github.com/leaflabs/maple>`_.  Other
 than the processor used, the design files for the Maple RET6 edition
 are identical to the Maple Rev 5, which are in the ``maple-r5``
 subdirectory of the Maple repository.  A schematic for a JTAG adapter
@@ -293,7 +311,7 @@ directory.
 
 From the GitHub repository main page, you can download the entire
 repository by clicking the "Download" button.  If you are familiar
-with `git <http://git-scm.com/>`_, you can also clone the repository
+with `Git <http://git-scm.com/>`_, you can also clone the repository
 at the command line with ::
 
     $ git clone git://github.com/leaflabs/maple.git
@@ -315,48 +333,81 @@ damage your board permanently.
 Errata
 ------
 
-This section lists known issues and warnings for the Maple RET6 Edition.
+This section lists known issues and warnings for the Maple RET6
+Edition.  Some of these are simply due to the RET6 Edition using the
+Maple's circuit board, which was not designed to accomodate extra
+features only available on the STM32F103RET6.
 
-* **Power Supply Marketing Mistake**: We originally sold the Maple
+.. _maple-ret6-barrel-jack:
+
+* **Barrel jack power supply voltage mistake**: The silkscreen next to
+  the barrel jack connector incorrectly indicates that up to an 18 V
+  input voltage is allowed.  **We do not recommend exceeding 12 V**.
+
+  See this :ref:`Maple erratum <maple-barrel-jack>` for more
+  information.
+
+* **Power supply marketing mistake**: We originally sold the Maple
   RET6 Edition advertising that it was capable of supplying up to 800
   mA; the correct value is 500 mA.
 
-.. _maple-ret6-uart-errata:
+.. _maple-ret6-uarts:
 
 * **UART4, UART5 GPIOs unavailable**: Pins related to UARTs 4 and 5
   are not broken out to headers (specifically, PC11/UART4_RX and
-  PC12/UART5_TX).  The RET6 Edition's hardware layout is identical to
-  that of the Maple Rev 5, which wasn't designed for use with these
-  STM32F103RET6-only peripherals.
+  PC12/UART5_TX).  This is due to the RET6 Edition's board layout
+  being that of the Maple Rev 5, which was not designed with these
+  RET6-specific features in mind.
 
 .. _maple-ret6-dac-ch2:
 
 * **DAC channel 2 on BOARD_LED_PIN**: The Maple Rev 5 connects PA5 to
   the board's built-in LED; this is the same GPIO bit which is
   connected to the DAC's channel 2 output.  This is also due to the
-  RET6 Edition's board layout being copied from the base Maple Rev 5.
+  RET6 Edition's board layout being that of the Maple Rev 5.  The DAC
+  output channel is still available, and (if you use libmaple) its
+  output is buffered by default, so this may not significantly
+  interfere with its functionality.
 
 .. _maple-ret6-nrst-pb4:
 
 * **Reset and PB4 tied together**: The RET6 Edition's reset line is
   also connected to PB4, which is labeled on the silkscreen as pin 43.
-  Thus, attempting to use pin 43 as a GPIO may reset your board.  This
+  Thus, attempting to use pin 43 as a GPIO can reset your board.  This
   has other implications.  Since PB4 is also the JTAG NJTRST line,
   this prevents the :ref:`JTAG <jtag>` "reset halt" command from
   working properly.  Also, since PB4 is SPI3_MISO, the SPI3 peripheral
   is not fully usable.
 
+.. _maple-ret6-sdio:
+
+* **SDIO lines not broken out**: The RET6 Edition's SDIO peripheral is
+  not usable, as some of its data lines are either not broken out or
+  used for other purposes.  This is also due to the RET6 Edition's
+  board layout being that of the Maple Rev 5.
+
+.. _maple-ret6-adc-led:
+
+* **ADC on BOARD_LED_PIN**: We originally sold the Maple RET6 Edition
+  advertising 16 analog input lines.  However, one of them (the one on
+  pin 13) is also connected to the built-in LED.  The voltage drop
+  across the LED means that the analog to digital converter on that
+  pin is not really useful.  While it is still usable, its readings
+  will be incorrect.
+
 Recommended Reading
 -------------------
 
-* STMicro documentation for STM32F103RE microcontroller:
-
-    * `Datasheet
-      <http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00191185.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)
-    * `ST's STM32F103RE reference page
-      <http://www.st.com/internet/mcu/product/164485.jsp>`_
+STMicro documentation for STM32F103RE microcontroller:
+
+* `Datasheet
+  <http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00191185.pdf>`_
+  (PDF); covers STM32F103xC, STM32F103xD, STM32F103xE.
+* `Reference Manual RM0008
+  <http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/REFERENCE_MANUAL/CD00171190.pdf>`_
+  (PDF); general, definitive resource for STM32F1 line.
+* `Programming Manual PM0056
+  <http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/PROGRAMMING_MANUAL/CD00228163.pdf>`_
+  (PDF); assembly language and register reference.
+* `STM32F103RE <http://www.st.com/internet/mcu/product/164485.jsp>`_
+  overview page with links to further references.