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annotate doc/High-speed-serial @ 1033:5ab737ac3ad7

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TCH special feature documentation update
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 01 Jun 2016 02:06:44 +0000
parents f4da3071dd61
children
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f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
1 The highest baud rate supported by "standard" PC serial ports is 115200 bps,
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
2 but Calypso UARTs can go quite a bit faster. Being clocked with 13 MHz (a
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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3 standard frequency in the GSM world), these UARTs can produce non-standard
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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4 (outside of the GSM world) baud rates of 203125, 406250 and 812500 bps. When
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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5 working with Motorola C1xx and Openmoko GTA01/02 phones which present a debug
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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6 and programming serial interface on a 2.5 mm headset jack, one can make use of
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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7 these high serial baud rates by using a USB to headset jack programming cable
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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8 based on one of the better USB-serial chips that can support these GSM special
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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9 baud rates well above 115200. The two USB-serial chips that are known to work
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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10 in this manner are CP2102 and FTDI, although each of the two requires its own
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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11 special quirks described below. Other USB to serial cables use chips which
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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12 don't support the high baud rates in question, and therefore are limited to
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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13 115200 baud max like a "standard" PC serial port.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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14
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
15 FreeCalypso tools can use these high serial baud rates in the following ways:
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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16
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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17 * When you use fc-loadtool to dump and program GSM device flash memory
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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18 (flashing firmware images), the transfers get annoyingly slow at 115200 baud
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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19 if you have to do it a lot. Switching to 406250 or even better 812500 baud
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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20 makes them go considerably faster.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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21
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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22 * Some of our target devices have large enough RAM to execute a GSM firmware
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
23 image entirely from RAM without flashing - very handy for development and
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
24 experimentation. The tool used to run these RAM-based images is fc-xram,
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
25 and it also supports the option of using high serial baud rates for the image
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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26 transfer for the same reason: repeatedly transferring 1.5 MiB images over
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
27 115200 baud gets tiresome.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
28
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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29 * If you are building your own GSM firmware (either FC GSM fw or one of our
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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30 TCS211-based hacks), you can make it run its RVTMUX interface at 406250 or
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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31 812500 baud. We used this trick when we tried to make TCS211 with D-Sample-
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
32 targeting UI (176x220 pix LCD, 16 bits per pixel) send its virtual LCD raster
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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33 blits out the serial port. Our rvtdump and rvinterf utilities support this
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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34 mode of operation by providing options to select different baud rates.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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35
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
36 Using CP2102 adapters
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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37 =====================
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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38
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
39 CP2102 chips have a built-in EEPROM that contains (among other things) a
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
40 32-entry table in which the supported serial baud rates are programmed. In
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
41 order to support the special GSM baud rates, these rates need to be added to
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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42 that table, displacing some other entries. The convention established by the
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
43 Pirelli DP-L10 phone (has a CP2102 built in and programmed at the factory for
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
44 GSM baud rates) is that 203120 baud takes the place of 230400, 406250 takes the
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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45 place of 460800, and 812500 takes the place of 921600.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
46
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
47 Because you need a special cable anyway to make the necessary physical
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
48 connection to the debug/programming serial port presented on a 2.5 mm headset
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
49 jack, you will probably be buying the requisite cable from a specialized
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
50 professional vendor. In that case it is that vendor's responsibility to sell
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
51 you the cable with the CP2102 chip already programmed with GSM baud rates:
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
52 because the physical construction of the cable (2.5 mm headset jack on the
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
53 serial end) makes it specific to GSM devices, and all known GSM devices use a
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
54 13 MHz clock or some integer multiple thereof, it is pointless for a
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
55 physically-GSM-specific cable to be set up for 230400/460800/921600 baud when
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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56 all known GSM devices will need 203125/406250/812500 baud instead.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
57
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
58 If you making a CP2102-based serial cable yourself (either for your own personal
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
59 use or professionally/commercially), please follow these instructions for baud
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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60 rate programming:
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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61
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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62 http://bb.osmocom.org/trac/wiki/Hardware/CP210xTutorial
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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63
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
64 If you follow the procedure given on that page, your CP2102 will be programmed
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
65 the same way as the one in the Pirelli DP-L10 (Foxconn's original factory
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
66 programming).
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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67
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
68 The serial port handling code in FreeCalypso host tools is written to request
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
69 B230400 from termios when 203125 baud is desired, likewise B460800 for 406250
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
70 baud and B921600 for 812500 baud. Therefore, if you have a CP2102-based cable
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
71 with properly programmed EEPROM, everything will Just Work.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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72
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
73 Using FTDI adapters
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
74 ===================
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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75
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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76 Unlike CP2102, FTDI adapters don't require any non-volatile EEPROM programming
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
77 for GSM baud rates, but they have a different pain point - arguably a worse one
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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78 - that is entirely a software issue. The API which the Linux kernel provides
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
79 to userspace applications for opening and configuring serial ports provides no
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
80 clean, sensible way for an application to request a particular baud rate that
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
81 is not in the predefined-once-and-for-all list, and to make it unambiguous to
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
82 the in-kernel driver exactly what it wants.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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83
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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84 The method provided by the ftdi_sio driver in the standard Linux kernel is
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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85 gross, and I (Space Falcon) refuse to use it. The serial port handling code in
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
86 FreeCalypso host tools is written for the clean CP2102 way, and is *not* muddied
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
87 with the muck that would be necessary to get the high GSM baud rates with an
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
88 unpatched ftdi_sio driver. Therefore, if you would like to use one of the high
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
89 GSM baud rates with FreeCalypso with an FTDI adapter, you will need to dirty
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
90 your Linux host system with a hacky kernel patch. The patch provided in
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
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91 linux-2.6.37.6-ftdi_sio.c.patch (made against Linux 2.6.37.6, which is what I
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
92 use - came with Slackware 13.37 - adapt as necessary for your kernel version)
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
93 makes the ftdi_sio driver behave like a GSM-programmed CP2102: termios B230400
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
94 turns into 203125 baud, B460800 turns into 406250 and B921600 turns into 812500.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
95
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
96 This patch won't break other software (*cough* osmocom-bb *cough*) that does
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
97 use the "standard" ftdi_sio way of requesting high GSM baud rates, i.e., both
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
98 ways of selecting these baud rates should still work, but if you have other
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
99 (non-GSM) serial devices on the same system which need 230400, 460800 or 921600
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
100 baud, those will break.
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
101
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
102 Using adapters built into phones
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
103 ================================
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
104
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Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
105 The Calypso chip has no native USB capabilities, thus if a Calypso phone
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
106 presents a USB charging+data port to the user, it must have a USB to serial
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
107 converter built in. The only phone we currently know of that does this is
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
108 Pirelli DP-L10, and its built-in USB-serial adapter chip is CP2102. It has
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
109 already been programmed with the correct GSM baud rates on Foxconn's original
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
110 production line, thus one can always use 812500 baud with FreeCalypso tools on
f4da3071dd61 doc/High-speed-serial write-up and Linux kernel patch added
Mychaela Falconia <falcon@ivan.Harhan.ORG>
parents:
diff changeset
111 this phone and it will Just Work.