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DRIVER INFORMATION 2. DEVICE INFORMATION 3. WIRING 4. USERSPACE PROGRAMMING”h]”hŒUINDEX 1. DRIVER INFORMATION 2. DEVICE INFORMATION 3. WIRING 4. USERSPACE PROGRAMMING”…””}”hjsbah}”(h]”h ]”h"]”h$]”h&]”Œ xml:space”Œpreserve”uh1jhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒ1. Driver Information”h]”hŒ1. Driver Information”…””}”(hj”h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj‘h²hh³hÊh´Kubhì)”}”(hŒ&This driver supports a cfag12864b LCD.”h]”hŒ&This driver supports a cfag12864b LCD.”…””}”(hj¢h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´Khj‘h²hubeh}”(h]”Œdriver-information”ah ]”h"]”Œ1. driver information”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒ2. Device Information”h]”hŒ2. Device Information”…””}”(hj»h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj¸h²hh³hÊh´KubhÌ)”}”(hhh]”(hÑ)”}”(hhh]”(hÖ)”}”(hŒ Manufacturer”h]”hŒ Manufacturer”…””}”(hjÏh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjÌh³hÊh´Kubhæ)”}”(hŒ Crystalfontz”h]”hì)”}”(hjßh]”hŒ Crystalfontz”…””}”(hjáh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´KhjÝubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjÌubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´KhjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Device Name”h]”hŒ Device Name”…””}”(hjýh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjúh³hÊh´Kubhæ)”}”(hŒCrystalfontz 12864b LCD Series”h]”hì)”}”(hj h]”hŒCrystalfontz 12864b LCD Series”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´Khj ubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjúubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´KhjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Device Code”h]”hŒ Device Code”…””}”(hj+h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj(h³hÊh´Kubhæ)”}”(hŒ cfag12864b”h]”hì)”}”(hj;h]”hŒ cfag12864b”…””}”(hj=h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´Khj9ubah}”(h]”h ]”h"]”h$]”h&]”uh1håhj(ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´KhjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒWebpage”h]”hŒWebpage”…””}”(hjYh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjVh³hÊh´Kubhæ)”}”(hŒhttp://www.crystalfontz.com”h]”hì)”}”(hjih]”j#)”}”(hjih]”hŒhttp://www.crystalfontz.com”…””}”(hjnh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”jiuh1j"hjkubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´Khjgubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjVubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´KhjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒDevice Webpage”h]”hŒDevice Webpage”…””}”(hj‘h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjŽh³hÊh´Kubhæ)”}”(hŒ,http://www.crystalfontz.com/products/12864b/”h]”hì)”}”(hj¡h]”j#)”}”(hj¡h]”hŒ,http://www.crystalfontz.com/products/12864b/”…””}”(hj¦h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”j¡uh1j"hj£ubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´KhjŸubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjŽubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´KhjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒType”h]”hŒType”…””}”(hjÉh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjÆh³hÊh´Kubhæ)”}”(hŒLCD (Liquid Crystal Display)”h]”hì)”}”(hjÙh]”hŒLCD (Liquid Crystal Display)”…””}”(hjÛh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K hj×ubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjÆubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒWidth”h]”hŒWidth”…””}”(hj÷h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjôh³hÊh´Kubhæ)”}”(hŒ128”h]”hì)”}”(hjh]”hŒ128”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K!hjubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjôubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K!hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒHeight”h]”hŒHeight”…””}”(hj%h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj"h³hÊh´Kubhæ)”}”(hŒ64”h]”hì)”}”(hj5h]”hŒ64”…””}”(hj7h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K"hj3ubah}”(h]”h ]”h"]”h$]”h&]”uh1håhj"ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K"hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒColors”h]”hŒColors”…””}”(hjSh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjPh³hÊh´Kubhæ)”}”(hŒ2 (B/N)”h]”hì)”}”(hjch]”hŒ2 (B/N)”…””}”(hjeh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K#hjaubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjPubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K#hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Controller”h]”hŒ Controller”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj~h³hÊh´Kubhæ)”}”(hŒks0108”h]”hì)”}”(hj‘h]”hŒks0108”…””}”(hj“h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K$hjubah}”(h]”h ]”h"]”h$]”h&]”uh1håhj~ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K$hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Controllers”h]”hŒ Controllers”…””}”(hj¯h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj¬h³hÊh´Kubhæ)”}”(hŒ2”h]”hì)”}”(hj¿h]”hŒ2”…””}”(hjÁh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K%hj½ubah}”(h]”h ]”h"]”h$]”h&]”uh1håhj¬ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K%hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒPages”h]”hŒPages”…””}”(hjÝh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjÚh³hÊh´Kubhæ)”}”(hŒ8 each controller”h]”hì)”}”(hjíh]”hŒ8 each controller”…””}”(hjïh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K&hjëubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjÚubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K&hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Addresses”h]”hŒ Addresses”…””}”(hj h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjh³hÊh´Kubhæ)”}”(hŒ 64 each page”h]”hì)”}”(hjh]”hŒ 64 each page”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K'hjubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K'hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Data size”h]”hŒ Data size”…””}”(hj9h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhj6h³hÊh´Kubhæ)”}”(hŒ1 byte each address”h]”hì)”}”(hjIh]”hŒ1 byte each address”…””}”(hjKh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K(hjGubah}”(h]”h ]”h"]”h$]”h&]”uh1håhj6ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K(hjÉh²hubhÑ)”}”(hhh]”(hÖ)”}”(hŒ Memory size”h]”hŒ Memory size”…””}”(hjgh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÕhjdh³hÊh´Kubhæ)”}”(hŒ'2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte ”h]”hì)”}”(hŒ%2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte”h]”hŒ%2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte”…””}”(hjyh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K)hjuubah}”(h]”h ]”h"]”h$]”h&]”uh1håhjdubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÐh³hÊh´K)hjÉh²hubeh}”(h]”h ]”h"]”h$]”h&]”uh1hËhj¸h²hh³hÊh´Kubeh}”(h]”Œdevice-information”ah ]”h"]”Œ2. device information”ah$]”h&]”uh1hµhh·h²hh³hÊh´Kubh¶)”}”(hhh]”(h»)”}”(hŒ 3. Wiring”h]”hŒ 3. Wiring”…””}”(hj¤h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhj¡h²hh³hÊh´K-ubhì)”}”(hŒ5The cfag12864b LCD Series don't have official wiring.”h]”hŒ7The cfag12864b LCD Series don’t have official wiring.”…””}”(hj²h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K/hj¡h²hubhì)”}”(hŒ9The common wiring is done to the parallel port as shown::”h]”hŒ8The common wiring is done to the parallel port as shown:”…””}”(hjÀh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K1hj¡h²hubhŒ literal_block”“”)”}”(hX¥Parallel Port cfag12864b Name Pin# Pin# Name Strobe ( 1)------------------------------(17) Enable Data 0 ( 2)------------------------------( 4) Data 0 Data 1 ( 3)------------------------------( 5) Data 1 Data 2 ( 4)------------------------------( 6) Data 2 Data 3 ( 5)------------------------------( 7) Data 3 Data 4 ( 6)------------------------------( 8) Data 4 Data 5 ( 7)------------------------------( 9) Data 5 Data 6 ( 8)------------------------------(10) Data 6 Data 7 ( 9)------------------------------(11) Data 7 (10) [+5v]---( 1) Vdd (11) [GND]---( 2) Ground (12) [+5v]---(14) Reset (13) [GND]---(15) Read / Write Line (14)------------------------------(13) Controller Select 1 (15) Init (16)------------------------------(12) Controller Select 2 Select (17)------------------------------(16) Data / Instruction Ground (18)---[GND] [+5v]---(19) LED + Ground (19)---[GND] Ground (20)---[GND] E A Values: Ground (21)---[GND] [GND]---[P1]---(18) Vee - R = Resistor = 22 ohm Ground (22)---[GND] | - P1 = Preset = 10 Kohm Ground (23)---[GND] ---- S ------( 3) V0 - P2 = Preset = 1 Kohm Ground (24)---[GND] | | Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -”h]”hX¥Parallel Port cfag12864b Name Pin# Pin# Name Strobe ( 1)------------------------------(17) Enable Data 0 ( 2)------------------------------( 4) Data 0 Data 1 ( 3)------------------------------( 5) Data 1 Data 2 ( 4)------------------------------( 6) Data 2 Data 3 ( 5)------------------------------( 7) Data 3 Data 4 ( 6)------------------------------( 8) Data 4 Data 5 ( 7)------------------------------( 9) Data 5 Data 6 ( 8)------------------------------(10) Data 6 Data 7 ( 9)------------------------------(11) Data 7 (10) [+5v]---( 1) Vdd (11) [GND]---( 2) Ground (12) [+5v]---(14) Reset (13) [GND]---(15) Read / Write Line (14)------------------------------(13) Controller Select 1 (15) Init (16)------------------------------(12) Controller Select 2 Select (17)------------------------------(16) Data / Instruction Ground (18)---[GND] [+5v]---(19) LED + Ground (19)---[GND] Ground (20)---[GND] E A Values: Ground (21)---[GND] [GND]---[P1]---(18) Vee - R = Resistor = 22 ohm Ground (22)---[GND] | - P1 = Preset = 10 Kohm Ground (23)---[GND] ---- S ------( 3) V0 - P2 = Preset = 1 Kohm Ground (24)---[GND] | | Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -”…””}”hjÐsbah}”(h]”h ]”h"]”h$]”h&]”jjuh1jÎh³hÊh´K3hj¡h²hubeh}”(h]”Œwiring”ah ]”h"]”Œ 3. wiring”ah$]”h&]”uh1hµhh·h²hh³hÊh´K-ubh¶)”}”(hhh]”(h»)”}”(hŒ4. Userspace Programming”h]”hŒ4. Userspace Programming”…””}”(hjéh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hºhjæh²hh³hÊh´KSubhì)”}”(hŒ;The cfag12864bfb describes a framebuffer device (/dev/fbX).”h]”hŒ;The cfag12864bfb describes a framebuffer device (/dev/fbX).”…””}”(hj÷h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´KUhjæh²hubhì)”}”(hŒŸIt has a size of 1024 bytes = 1 Kbyte. Each bit represents one pixel. If the bit is high, the pixel will turn on. If the pixel is low, the pixel will turn off.”h]”hŒŸIt has a size of 1024 bytes = 1 Kbyte. Each bit represents one pixel. If the bit is high, the pixel will turn on. If the pixel is low, the pixel will turn off.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´KWhjæh²hubhì)”}”(hŒ‡You can use the framebuffer as a file: fopen, fwrite, fclose... Although the LCD won't get updated until the next refresh time arrives.”h]”hŒ‰You can use the framebuffer as a file: fopen, fwrite, fclose... Although the LCD won’t get updated until the next refresh time arrives.”…””}”(hjh²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K[hjæh²hubhì)”}”(hŒjAlso, you can mmap the framebuffer: open & mmap, munmap & close... which is the best option for most uses.”h]”hŒjAlso, you can mmap the framebuffer: open & mmap, munmap & close... which is the best option for most uses.”…””}”(hj!h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´K^hjæh²hubhì)”}”(hŒpCheck samples/auxdisplay/cfag12864b-example.c for a real working userspace complete program with usage examples.”h]”hŒpCheck samples/auxdisplay/cfag12864b-example.c for a real working userspace complete program with usage examples.”…””}”(hj/h²hh³Nh´Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hëh³hÊh´Kahjæh²hubeh}”(h]”Œuserspace-programming”ah ]”h"]”Œ4. userspace programming”ah$]”h&]”uh1hµhh·h²hh³hÊh´KSubeh}”(h]”Œ#cfag12864b-lcd-driver-documentation”ah ]”h"]”Œ#cfag12864b lcd driver documentation”ah$]”h&]”uh1hµhhh²hh³hÊh´Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”hÊuh1hŒcurrent_source”NŒ current_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(hºNŒ generator”NŒ datestamp”NŒ source_link”NŒ source_url”NŒ toc_backlinks”Œentry”Œfootnote_backlinks”KŒ sectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒ strip_classes”NŒ report_level”KŒ halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ traceback”ˆŒinput_encoding”Œ utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jpŒerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œ language_code”Œen”Œrecord_dependencies”NŒconfig”NŒ id_prefix”hŒauto_id_prefix”Œid”Œ dump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”hÊŒ _destination”NŒ _config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒ raw_enabled”KŒline_length_limit”M'Œpep_references”NŒ pep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒ rfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œ smart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œ docinfo_xform”KŒsectsubtitle_xform”‰Œ image_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”(jJjGjµj²jžj›jãjàjBj?uŒ nametypes”}”(jJ‰jµ‰jž‰jã‰jB‰uh}”(jGh·j²j‘j›j¸jàj¡j?jæuŒ footnote_refs”}”Œ citation_refs”}”Œ autofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ footnotes”]”Œ citations”]”Œautofootnote_start”KŒsymbol_footnote_start”KŒ id_counter”Œ collections”ŒCounter”“”}”…”R”Œparse_messages”]”Œtransform_messages”]”Œ transformer”NŒ include_log”]”Œ decoration”Nh²hub.