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Diffstat (limited to 'source/usb.rst')
| -rw-r--r-- | source/usb.rst | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/source/usb.rst b/source/usb.rst index f040034..a67d710 100644 --- a/source/usb.rst +++ b/source/usb.rst @@ -2,34 +2,32 @@ .. _usb: -===== - USB -===== +USB +=== -The Maple STM32 microprocessor includes a dedicated USB peripheral -which can be configured to act as a general USB slave device with -transfer rates up to 12Mbps (it unfortunately can't be configured as a -host or on-the-go device). By default, the peripheral is configured -for two uses: first, to receive sketch/program uploads from the IDE, -and second, to emulate a regular serial port for use as a terminal -(text read/write). +The STM32 microprocessors include a dedicated USB peripheral which can +be configured to act as a general USB slave device with transfer rates +up to 12Mbps. (It unfortunately can't be configured as a host or +on-the-go device). By default, the peripheral is configured for two +uses: first, to receive sketch/program uploads from the :ref:`IDE +<ide>`, and second, to emulate a regular serial port for use as a +terminal (text read/write). The emulated terminal is relatively slow and inefficient; it is best for transferring data at regular serial speeds (kilobaud). Library support for accessing the emulated terminal is available at the :ref:`SerialUSB <lang-serialusb>` reference. -The SerialUSB channel is used as part of the auto-reset feature of the -IDE to program the board on Maple Rev 3 and Rev 5: a :ref:`magic -sequence of control line toggles and transmitted data -<bootloader-rev3>` causes the Maple to reset itself and enter -bootloader mode. As an unfortunate consequence, the auto-reset will -not work if the IDE can not access the serial port, either due to a -conflict with another program (serial monitor) or because the -interface has been disabled from the Maple side (through -:ref:`SerialUSB.end() <lang-serialusb-end>`). A solution to the -second problem is the use of :ref:`perpetual bootloader mode -<troubleshooting-perpetual-bootloader>`. +The SerialUSB channel is used with the :ref:`Maple bootloader +<bootloader>` to reprogram the board: a :ref:`magic sequence of +control line toggles and transmitted data <bootloader-rev3>` causes a +Maple to reset itself and enter bootloader mode. As an unfortunate +consequence, the auto-reset will not work if the IDE can not access +the serial port, either due to a conflict with another program (serial +monitor) or because the interface has been disabled from the Maple +side (through :ref:`SerialUSB.end() <lang-serialusb-end>`). A +solution to the second problem is the use of :ref:`perpetual +bootloader mode <troubleshooting-perpetual-bootloader>`. Recommended Reading ------------------- @@ -40,9 +38,11 @@ Recommended Reading * `Embedded USB - a brief tutorial <http://www.computer-solutions.co.uk/info/Embedded_tutorials/usb_tutorial.htm>`_ * `Wikipedia article on Universal Serial Bus (USB) <http://en.wikipedia.org/wiki/Universal_Serial_Bus>`_ * Linux Kernel documentation for `USB ACM <http://www.kernel.org/doc/Documentation/usb/acm.txt>`_ and `USB Serial <http://www.kernel.org/doc/Documentation/usb/usb-serial.txt>`_ -* STMicro documentation for STM32F103RB microcontroller: - - * `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) +* ST documentation: + * Reference Manual `RM0008 + <http://www.st.com/stonline/products/literature/rm/13902.pdf>`_ + (PDF), Chapter 23, "Universal serial bus full-speed device + interface" + * `Programming Manual + <http://www.st.com/stonline/products/literature/pm/15491.pdf>`_ + (PDF; assembly language and register reference) |