Author: wmb Date: 2009-08-09 05:30:55 +0200 (Sun, 09 Aug 2009) New Revision: 1287
Added: dev/olpc/viacamera/ dev/olpc/viacamera/camera.fth dev/olpc/viacamera/loadpkg.fth dev/olpc/viacamera/smbus.fth Modified: cpu/x86/pc/olpc/via/devices.fth Log: Via - added camera selftest.
Modified: cpu/x86/pc/olpc/via/devices.fth =================================================================== --- cpu/x86/pc/olpc/via/devices.fth 2009-08-06 03:48:08 UTC (rev 1286) +++ cpu/x86/pc/olpc/via/devices.fth 2009-08-09 03:30:55 UTC (rev 1287) @@ -306,8 +306,9 @@ end-package devalias screen /display also hidden d# 34 to display-height previous \ For editing -[then]
+fload ${BP}/dev/olpc/viacamera/loadpkg.fth \ Camera driver + fload ${BP}/cpu/x86/adpcm.fth \ ADPCM decoding
warning @ warning off
Added: dev/olpc/viacamera/camera.fth =================================================================== --- dev/olpc/viacamera/camera.fth (rev 0) +++ dev/olpc/viacamera/camera.fth 2009-08-09 03:30:55 UTC (rev 1287) @@ -0,0 +1,564 @@ +\ See license at end of file +purpose: Driver for OLPC camera connected to Via VX855 Video Capture Port + +headers +hex + +" OV7670" " sensor" string-property + +: cl! ( l adr -- ) " mmio-base" $call-parent + rl! ; +: cl@ ( adr -- l ) " mmio-base" $call-parent + rl@ ; + +\ ======================= OV7670 SMBUS operations ========================== + +h# 42 constant ov-sid +h# 31 constant sccb-port + +: sccb-setup ( -- ) sccb-port to smb-port ov-sid to smb-slave ; +: ov@ ( reg -- data ) sccb-setup smb-byte@ ; +: ov! ( data reg -- ) sccb-setup smb-byte! ; + +: ovc ( val adr -- ) + 2dup ov@ ( val reg# val actual ) + tuck <> if ( val reg# actual ) + ." Bad camera I2C value at " swap 2 u.r ( val actual ) + ." expected " swap 2 u.r ." got " 2 u.r cr ( ) + else ( val reg# actual ) + 3drop ( ) + then ( ) +; + +\ ============================= camera operations ============================= + +false value ov7670-detected? + +: ((camera-init) ( -- ) + 80 12 ov! 2 ms \ reset (reads back different) + 01 11 ov! \ 30 fps + 04 3a ov! \ UYVY or VYUY + 00 12 ov! \ VGA + + \ Hardware window + 13 17 ov! \ Horiz start high bits + 01 18 ov! \ Horiz stop high bits + b6 32 ov! \ HREF pieces + 0a 19 ov! \ Vert start high bits + 7a 1a ov! \ Vert stop high bits + 0a 03 ov! \ GAIN, VSTART, VSTOP pieces + + \ Mystery scaling numbers + 00 0c ov! \ Control 3 + 00 3e ov! \ Control 14 + 3a 70 ov! 35 71 ov! 11 72 ov! f0 73 ov! + 02 a2 ov! + 00 15 ov! \ Control 10 + + \ Gamma curve values + 20 7a ov! 10 7b ov! 1e 7c ov! 35 7d ov! + 5a 7e ov! 69 7f ov! 76 80 ov! 80 81 ov! + 88 82 ov! 8f 83 ov! 96 84 ov! a3 85 ov! + af 86 ov! c4 87 ov! d7 88 ov! e8 89 ov! + + \ AGC and AEC parameters + e0 13 ov! \ Control 8 + 00 00 ov! \ Gain lower 8 bits + 40 0d ov! \ Control 4 magic reserved bit + 18 14 ov! \ Control 9: 4x gain + magic reserved bit + 05 a5 ov! \ 50hz banding step limit + 07 ab ov! \ 60hz banding step limit + 95 24 ov! \ AGC upper limit + 33 25 ov! \ AGC lower limit + e3 24 ov! \ AGC/AEC fast mode op region + 78 9f ov! \ Hist AEC/AGC control 1 + 68 a0 ov! \ Hist AEC/AGC control 2 + 03 a1 ov! \ Magic + d8 a6 ov! \ Hist AEC/AGC control 3 + d8 a7 ov! \ Hist AEC/AGC control 4 + f0 a8 ov! \ Hist AEC/AGC control 5 + 90 a9 ov! \ Hist AEC/AGC control 6 + 94 aa ov! \ Hist AEC/AGC control 7 + e5 13 ov! \ Control 8 + + \ Mostly magic + 61 0e ov! 4b 0f ov! 02 16 ov! 07 1e ov! + 02 21 ov! 91 22 ov! 07 29 ov! 0b 33 ov! + 0b 35 ov! 1d 37 ov! 71 38 ov! 2a 39 ov! + 78 3c ov! 40 4d ov! 20 4e ov! 00 69 ov! + 4a 6b ov! 10 74 ov! 4f 8d ov! 00 8e ov! + 00 8f ov! 00 90 ov! 00 91 ov! 00 96 ov! + 00 9a ov! 84 b0 ov! 0c b1 ov! 0e b2 ov! + 82 b3 ov! 0a b8 ov! + + \ More magic, some of which tweaks white balance + 0a 43 ov! f0 44 ov! 34 45 ov! 58 46 ov! + 28 47 ov! 3a 48 ov! 88 59 ov! 88 5a ov! + 44 5b ov! 67 5c ov! 49 5d ov! 0e 5e ov! + 0a 6c ov! 55 6d ov! 11 6e ov! + 9f 6f ov! \ 9e for advance AWB + 40 6a ov! + 40 01 ov! \ Blue gain + 60 02 ov! \ Red gain + e7 13 ov! \ Control 8 + + \ Matrix coefficients + 80 4f ov! 80 50 ov! 00 51 ov! 22 52 ov! + 5e 53 ov! 80 54 ov! 9e 58 ov! + + 08 41 ov! \ AWB gain enable + 00 3f ov! \ Edge enhancement factor + 05 75 ov! e1 76 ov! 00 4c ov! 01 77 ov! + c3 3d ov! \ Control 13 + 09 4b ov! 60 c9 ov! \ Reads back differently + 38 41 ov! \ Control 16 + 40 56 ov! + + 11 34 ov! + 12 3b ov! \ Control 11 + 88 a4 ov! 00 96 ov! 30 97 ov! 20 98 ov! + 30 99 ov! 84 9a ov! 29 9b ov! 03 9c ov! + 5c 9d ov! 3f 9e ov! 04 78 ov! + + \ Extra-weird stuff. Some sort of multiplexor register + 01 79 ov! f0 c8 ov! + 0f 79 ov! 00 c8 ov! + 10 79 ov! 7e c8 ov! + 0a 79 ov! 80 c8 ov! + 0b 79 ov! 01 c8 ov! + 0c 79 ov! 0f c8 ov! + 0d 79 ov! 20 c8 ov! + 09 79 ov! 80 c8 ov! + 02 79 ov! c0 c8 ov! + 03 79 ov! 40 c8 ov! + 05 79 ov! 30 c8 ov! + 26 79 ov! + + \ OVT says that rewrite this works around a bug in 565 mode. + \ The symptom of the bug is red and green speckles in the image. + 01 11 ov! \ 30 fps def 80 +; + +: config-check ( -- ) + 01 11 ovc \ 30 fps + 04 3a ovc \ UYVY or VYUY + ( 00 12 ovc ) \ VGA + + \ Hardware window + 13 17 ovc \ Horiz start high bits + 01 18 ovc \ Horiz stop high bits + b6 32 ovc \ HREF pieces + ( 0a 19 ovc ) \ Vert start high bits + 7a 1a ovc \ Vert stop high bits + 0a 03 ovc \ GAIN, VSTART, VSTOP pieces + + \ Mystery scaling numbers + 00 0c ovc \ Control 3 + 00 3e ovc \ Control 14 + 3a 70 ovc 35 71 ovc 11 72 ovc f0 73 ovc + 02 a2 ovc + 00 15 ovc \ Control 10 + + \ Gamma curve values + 20 7a ovc 10 7b ovc 1e 7c ovc 35 7d ovc + 5a 7e ovc 69 7f ovc 76 80 ovc 80 81 ovc + 88 82 ovc 8f 83 ovc 96 84 ovc a3 85 ovc + af 86 ovc c4 87 ovc d7 88 ovc e8 89 ovc + + \ AGC and AEC parameters + ( e0 13 ovc ) \ Control 8 + ( 00 00 ovc ) \ Gain lower 8 bits + 40 0d ovc \ Control 4 magic reserved bit + ( 18 14 ovc ) \ Control 9: 4x gain + magic reserved bit + 05 a5 ovc \ 50hz banding step limit + 07 ab ovc \ 60hz banding step limit + ( 95 24 ovc ) \ AGC upper limit + 33 25 ovc \ AGC lower limit + e3 24 ovc \ AGC/AEC fast mode op region + 78 9f ovc \ Hist AEC/AGC control 1 + 68 a0 ovc \ Hist AEC/AGC control 2 + 03 a1 ovc \ Magic + d8 a6 ovc \ Hist AEC/AGC control 3 + d8 a7 ovc \ Hist AEC/AGC control 4 + f0 a8 ovc \ Hist AEC/AGC control 5 + 90 a9 ovc \ Hist AEC/AGC control 6 + 94 aa ovc \ Hist AEC/AGC control 7 + ( e5 13 ovc ) \ Control 8 + + \ Mostly magic + 61 0e ovc 4b 0f ovc 02 16 ovc 07 1e ovc + 02 21 ovc 91 22 ovc 07 29 ovc 0b 33 ovc + 0b 35 ovc 1d 37 ovc 71 38 ovc 2a 39 ovc + 78 3c ovc 40 4d ovc 20 4e ovc 00 69 ovc + 4a 6b ovc 10 74 ovc 4f 8d ovc 00 8e ovc + 00 8f ovc 00 90 ovc 00 91 ovc 00 96 ovc + ( 00 9a ovc ) 84 b0 ovc 0c b1 ovc 0e b2 ovc + 82 b3 ovc 0a b8 ovc + + \ More magic, some of which tweaks white balance + 0a 43 ovc f0 44 ovc 34 45 ovc 58 46 ovc + 28 47 ovc 3a 48 ovc 88 59 ovc 88 5a ovc + 44 5b ovc 67 5c ovc 49 5d ovc 0e 5e ovc + 0a 6c ovc 55 6d ovc 11 6e ovc + 9f 6f ovc \ 9e for advance AWB + ( 40 6a ovc ) + ( 40 01 ovc ) \ Blue gain + ( 60 02 ovc ) \ Red gain + e7 13 ovc \ Control 8 + + \ Matrix coefficients + b3 4f ovc b3 50 ovc 00 51 ovc 3d 52 ovc + a7 53 ovc e4 54 ovc 9e 58 ovc + + \ 08 41 ovc \ AWB gain enable + ( 00 3f ovc ) \ Edge enhancement factor + 05 75 ovc e1 76 ovc ( 00 4c ovc ) 01 77 ovc + c0 3d ovc \ Control 13 + 09 4b ovc ( 60 c9 ovc ) + 38 41 ovc \ Control 16 + 40 56 ovc + + 11 34 ovc + 12 3b ovc \ Control 11 + 88 a4 ovc 00 96 ovc 30 97 ovc 20 98 ovc + 30 99 ovc 84 9a ovc 29 9b ovc 03 9c ovc + 5c 9d ovc 3f 9e ovc 04 78 ovc + +; + +: camera-init ( -- ) + false to ov7670-detected? + ((camera-init) + 1d ov@ 1c ov@ bwjoin 7fa2 <> if exit then \ Manufacturing ID + b ov@ a ov@ bwjoin 7673 <> if exit then \ Product ID + true to ov7670-detected? +; + +\ VGA RGB565 +: init-rgb565 ( -- ) + 04 12 ov! \ VGA, RGB565 + 00 8c ov! \ No RGB444 + 40 04 ov! \ Control 1: CCIR656 (CaFe value is 00) + 10 40 ov! \ RGB565 output + 38 14 ov! \ 16x gain ceiling + b3 4f ov! \ v-red + b3 50 ov! \ v-green + 00 51 ov! \ v-blue + 3d 52 ov! \ u-red + a7 53 ov! \ u-green + e4 54 ov! \ u-blue + c0 3d ov! \ Gamma enable, UV saturation auto adjust +; + +: read-agc ( -- n ) + 3 ov@ h# c0 and 2 lshift 0 ov@ or +; + +: read-aec ( -- n ) + 7 ov@ h# 3f and d# 10 lshift + h# 10 ov@ 2 lshift or + 4 ov@ 3 and or +; + +: set-hw ( vstop vstart hstop hstart -- ) + dup 3 >> 17 ov! \ Horiz start high bits + over 3 >> 18 ov! \ Horiz stop high bits + 32 ov@ swap 7 and or swap 7 and 3 << or 10 ms 32 ov! \ Horiz bottom bits + + dup 2 >> 19 ov! \ Vert start high bits + over 2 >> 1a ov! \ Vert start high bits + 03 ov@ swap 3 and or swap 3 and 2 << or 10 ms 03 ov! \ Vert bottom bits +; + +: camera-config ( -- ) + ((camera-init) + init-rgb565 + d# 490 d# 10 d# 14 d# 158 set-hw \ VGA window info +; + +\ ========================== video capture operations ========================== + +d# 640 constant VGA_WIDTH +d# 480 constant VGA_HEIGHT + +VGA_WIDTH VGA_HEIGHT * 2* constant /dma-buf +3 constant #dma-bufs +0 value dma-bufs +0 value dma-bufs-phys +0 value next-buf + +: dma-sync ( virt phys size -- ) " dma-sync" $call-parent ; +: dma-alloc ( len -- adr ) " dma-alloc" $call-parent ; +: dma-free ( adr len -- ) " dma-free" $call-parent ; +: dma-map-in ( virt size cache? -- phys ) " dma-map-in" $call-parent ; +: dma-map-out ( virt phys size -- ) " dma-map-out" $call-parent ; + +: 'dma-buf ( i -- virt ) /dma-buf * dma-bufs + ; +: 'dma-buf-phys ( i -- phys ) /dma-buf * dma-bufs-phys + ; + +0 [if] +: alloc-dma-bufs ( -- ) + dma-bufs 0= if + /dma-buf #dma-bufs * dup dma-alloc dup to dma-bufs + swap false dma-map-in to dma-bufs-phys + then +; +: free-dma-bufs ( -- ) + dma-bufs ?dup if + /dma-buf #dma-bufs 1+ * 2dup dma-bufs-phys swap dma-map-out + dma-free + 0 to dma-bufs 0 to dma-bufs-phys + then +; + +: setup-dma ( -- ) + #dma-bufs 0 do + i 'dma-buf-phys 2 or i 4 * 340 + cl! \ Capture frame buffers + loop +; +[else] + +[ifdef] notdef +\ XXX Capture video to video memory only. I don't know why I can't capture to +\ XXX system memory. I'm using an arbitrary offset into the video memory. + +h# 200.0000 constant capture-base + +: alloc-dma-bufs ( -- ) + dma-bufs 0= if + capture-base dup frame-buffer-adr + to dma-bufs + to dma-bufs-phys + then +; +: free-dma-bufs ( -- ) 0 to dma-bufs 0 to dma-bufs-phys ; +[else] +: alloc-dma-bufs ( -- ) + dma-bufs 0= if + /dma-buf #dma-bufs * " alloc-capture-buffer" $call-parent to dma-bufs-phys to dma-bufs + then +; +: free-dma-bufs ( -- ) + dma-bufs dma-bufs-phys /dma-buf #dma-bufs * " free-capture-buffer" $call-parent + 0 to dma-bufs 0 to dma-bufs-phys +; +[then] +: setup-dma ( -- ) + #dma-bufs 0 do + i 'dma-buf-phys 340 i 4 * + cl! \ Capture frame buffers + loop +; + +[then] + + +\ VGA RGB565 +: setup-image ( -- ) + 0 31c cl! \ Active video scaling control + 01e2.00f0 334 cl! \ Maximum data count of active video +; + +: ctlr-config ( -- ) + setup-dma + setup-image +; + +: ctlr-start ( -- ) 310 dup cl@ 1 or swap cl! ; \ Start the whole thing +: ctlr-stop ( -- ) 310 dup cl@ 1 invert and swap cl! ; \ Stop the whole thing + +: read-setup ( -- ) + camera-config + ctlr-config + 83 300 cl! \ Clear pending interrupts + 1000.0000 200 cl! \ Allow CAP0 end interrupt + ctlr-start + 0 to next-buf +; + +: soft-reset ( -- ) ; + +: (init) ( -- ) + 0 300 cl! \ Mask all interrupts + 8850.2114 310 cl! \ Enable CLK, FIFO threshold, UYVY, 8-bit CCIR656, + \ Capture odd/even in interlace, triple buffers + 500 350 cl! \ Disable coring and 640*2 stride +; + +: power-up ( -- ) + \ Disable UART + 8846 dup config-b@ 40 invert and swap config-b! \ Disable UART + 78 dup seq@ 80 invert and swap seq! \ Enable VCP/DVP1 interface + + \ Setup VGPIO[2..3] + 2c dup seq@ 02 or swap seq! \ Enable VGPIO2..3 ports + 2c dup seq@ d0 or swap seq! \ cam_PWREN, cam_Reset + 1 ms + 2c dup seq@ f0 or swap seq! \ Release reset + 1 ms + + \ Power on video capture port + 1e dup seq@ c0 or swap seq! \ Pad on/off according to PMS + 1 ms +; + +: power-off ( -- ) + 2c dup seq@ 20 invert and swap seq! \ Assert cam_Reset + 1 ms + 2c dup seq@ 10 invert and swap seq! \ Power off +; + +: init ( -- ) + (init) + power-up + sccb-setup smb-on + camera-init +; + + +\ ============================= read operation ============================== + +0 value buf-act +: /string ( adr len n -- adr' len' ) tuck - -rot + swap ; +: buf-done? ( -- done? ) + 200 cl@ 1000 and dup if + 300 cl@ 3 >> 3 and to next-buf + then +; + +: (read) ( adr len -- actual ) + next-buf 'dma-buf -rot /dma-buf min dup >r move r> ( actual ) + 300 cl@ 83 or 300 cl! \ Clear interrupts +; + +external + +: camera-read ( adr len -- actual ) + buf-done? if (read) else 2drop 0 then +; + +: camera-open ( -- flag ) + init + ov7670-detected? 0= if false exit then + alloc-dma-bufs + read-setup + true +; + +: camera-close ( -- ) + ctlr-stop + power-off + free-dma-bufs +; + + +\ ============================= selftest operation =========================== + +d# 10,000 constant movie-time +0 constant test-x +0 constant test-y + +\ Thanks to Cortland Setlow (AKA Blaketh) for the autobrightness code +\ and the full-screen + mirrored display. + +: autobright ( -- ) + read-agc 3 + 3 rshift h# f min " bright!" $call-parent +; +: full-brightness ( -- ) h# f " bright!" $call-parent ; + +: display-frame ( adr -- ) +\ test-x test-y VGA_WIDTH VGA_HEIGHT draw-rectangle + " expand-to-screen" $call-parent + autobright +; + +: timeout-read ( adr len timeout -- actual ) + >r 0 -rot r> 0 ?do ( actual adr len ) + 2dup camera-read ?dup if 3 roll drop -rot leave then + 1 ms + + loop 2drop +; + +: shoot-movie ( -- error? ) + /dma-buf #dma-bufs * dup dma-alloc swap ( adr len ) + get-msecs movie-time + -rot ( timeout adr len ) + begin + 2dup camera-read ?dup 0> if ( timeout adr len actual ) + VGA_WIDTH VGA_HEIGHT * 2* / 0 ?do over display-frame loop + else + 1 ms + then ( timeout adr len ) + get-msecs 3 pick u> + until ( timeout adr len ) + dma-free drop false ( error? ) +; + +: shoot-still ( -- error? ) + /dma-buf dup dma-alloc tuck ( adr len adr ) + /dma-buf d# 1,000 timeout-read 0> if ( adr len ) + over display-frame + false + else + true + then ( adr len error? ) + -rot dma-free ( error? ) +; + +: mirrored ( -- ) h# 1e ov@ h# 20 or h# 1e ov! ; +: unmirrored ( -- ) h# 1e ov@ h# 20 invert and h# 1e ov! ; + +: selftest ( -- error? ) + camera-open 0= if true exit then + d# 300 ms + unmirrored shoot-still ?dup if camera-close exit then ( error? ) + d# 1,000 ms + mirrored shoot-movie full-brightness ( error? ) + camera-close ( error? ) +; + +: dump-regs ( run# -- ) + 0 d# 16 " at-xy" eval + ." Pass " .d + key upc h# 47 = if ." Good" else ." Bad" then cr \ 47 is G + + ." 0 1 2 3 4 5 6 7 8 9 a b c d e f" cr + ." -----------------------------------------------" cr + h# ca 0 do + i 2 u.r ." : " + i h# 10 bounds do + i h# ca < if i ov@ 3 u.r then + loop + cr + h# 10 +loop +; + +: xselftest ( -- error? ) + camera-open 0= if true exit then + h# 10 0 do + shoot-still drop d# 500 ms camera-config config-check + i dump-regs + loop + 0 camera-close ( error? ) +; + + +\ LICENSE_BEGIN +\ Copyright (c) 2009 FirmWorks +\ +\ Permission is hereby granted, free of charge, to any person obtaining +\ a copy of this software and associated documentation files (the +\ "Software"), to deal in the Software without restriction, including +\ without limitation the rights to use, copy, modify, merge, publish, +\ distribute, sublicense, and/or sell copies of the Software, and to +\ permit persons to whom the Software is furnished to do so, subject to +\ the following conditions: +\ +\ The above copyright notice and this permission notice shall be +\ included in all copies or substantial portions of the Software. +\ +\ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +\ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +\ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +\ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +\ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +\ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +\ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +\ +\ LICENSE_END
Property changes on: dev/olpc/viacamera/camera.fth ___________________________________________________________________ Added: svn:executable + *
Added: dev/olpc/viacamera/loadpkg.fth =================================================================== --- dev/olpc/viacamera/loadpkg.fth (rev 0) +++ dev/olpc/viacamera/loadpkg.fth 2009-08-09 03:30:55 UTC (rev 1287) @@ -0,0 +1,27 @@ +dev screen +\ XXX Capture video to video memory only. I don't know why I can't capture to +\ XXX system memory. I'm using an arbitrary offset into the video memory. + +h# 200.0000 constant capture-base + +: alloc-capture-buffer ( len -- vadr padr ) + >r ( r: len ) + capture-base 0 h# 0200.0010 my-space or ( pci-phys.. r: len ) + r> " map-in" $call-parent ( vadr ) + + dup >physical ( vadr padr ) +; + +: free-capture-buffer ( vadr padr len -- ) nip unmap ; + +: dma-alloc ( len -- adr ) " dma-alloc" $call-parent ; +: dma-free ( adr len -- ) " dma-free" $call-parent ; + +new-device + " camera" device-name + fload ${BP}/dev/olpc/viacamera/smbus.fth + fload ${BP}/dev/olpc/viacamera/camera.fth +finish-device + +device-end +
Added: dev/olpc/viacamera/smbus.fth =================================================================== --- dev/olpc/viacamera/smbus.fth (rev 0) +++ dev/olpc/viacamera/smbus.fth 2009-08-09 03:30:55 UTC (rev 1287) @@ -0,0 +1,132 @@ +[ifndef] seq! +: seq! 3c4 pc! 3c5 pc! ; +[then] + +[ifndef] seq@ +: seq@ 3c4 pc! 3c5 pc@ ; +[then] + +0 value smb-port + +: smb-dly 4 us ; +: crtsp-set ( mask -- ) smb-port seq@ or smb-port seq! smb-dly ; +: crtsp-clr ( mask -- ) invert smb-port seq@ and smb-port seq! smb-dly ; +: crtsp@ ( mask -- flag ) smb-port seq@ and 0<> ; + +: smb-data-hi ( -- ) h# 10 crtsp-set ; +: smb-data-lo ( -- ) h# 10 crtsp-clr ; +: smb-clk-hi ( -- ) h# 20 crtsp-set ; +: smb-clk-lo ( -- ) h# 20 crtsp-clr ; +: smb-data@ ( -- flag ) 4 crtsp@ ; +: smb-clk@ ( -- ) 8 crtsp@ ; +\ : smb-on ( -- ) 1 crtsp-set h# 30 crtsp-set d# 10 ms ; +: smb-off ( -- ) 1 crtsp-clr ; +: smb-on ( -- ) h# 31 crtsp-set ; +: smb-bit@ ( -- ) smb-clk-hi smb-port seq@ 4 and 0<> smb-clk-lo ; + +h# 3500 constant smb-clk-timeout-us +\ Slave can flow control by holding CLK low temporarily +: smb-wait-clk-hi ( -- ) + smb-clk-timeout-us 0 do + smb-clk@ if smb-dly unloop exit then 1 us + loop + true abort" I2C clock stuck low" +; +: smb-data-hi-w ( -- ) smb-data-hi smb-wait-clk-hi ; + +h# 3500 constant smb-data-timeout-us +: smb-wait-data-hi ( -- ) + smb-data-timeout-us 0 do + smb-data@ if unloop exit then 1 us + loop + true abort" I2C data stuck low" +; + +: smb-restart ( -- ) + smb-clk-hi smb-data-lo smb-clk-lo +; + +: smb-start ( -- ) smb-clk-hi smb-data-hi smb-data-lo smb-clk-lo ; +: smb-stop ( -- ) smb-clk-lo smb-data-lo smb-clk-hi smb-data-hi ; + +: smb-get-ack ( -- ) + smb-data-hi + smb-clk-hi smb-wait-clk-hi + smb-data@ \ drop \ SCCB generates an don't care bit + if smb-stop true abort" I2c NAK" then + smb-clk-lo +\ smb-wait-data-hi +; +: smb-bit ( flag -- ) + if smb-data-hi else smb-data-lo then + smb-clk-hi smb-wait-clk-hi smb-clk-lo +; + +: smb-byte ( b -- ) + 8 0 do ( b ) + dup h# 80 and smb-bit ( b ) + 2* ( b' ) + loop ( b ) + drop ( ) + smb-get-ack +; +: smb-byte-in ( ack=0/nak=1 -- b ) + 0 + 8 0 do ( n ) + smb-clk-hi ( n ) + 2* smb-data@ if 1 or then ( n' ) + smb-clk-lo + loop + swap smb-bit smb-data-hi \ Send ACK or NAK +; + +0 value smb-slave +: smb-addr ( lowbit -- ) smb-slave or smb-byte ; + +: smb-byte! ( byte reg# -- ) + smb-start + 0 smb-addr ( byte reg# ) + smb-byte ( byte ) + smb-byte ( ) + smb-stop +; + +: smb-byte@ ( reg# -- byte ) + smb-start + 0 smb-addr ( reg# ) + smb-byte ( ) + smb-stop smb-start \ SCCB bus needs a stop and a start for the second phase + 1 smb-addr + 1 smb-byte-in ( byte ) + smb-stop +; + +: smb-word! ( word reg# -- ) + smb-start + 0 smb-addr ( word reg# ) + smb-byte ( word ) + wbsplit swap smb-byte smb-byte ( ) + smb-stop +; + +: smb-word@ ( reg# -- word ) + smb-start + 0 smb-addr ( reg# ) + smb-byte ( ) + smb-restart + 1 smb-addr ( ) + 0 smb-byte-in 1 smb-byte-in bwjoin ( word ) + smb-stop +; + +\ This can useful for clearing out DCON SMB internal state +: smb-pulses ( -- ) + d# 32 0 do smb-clk-lo smb-clk-hi loop +; + +h# 26 constant dcon-port +: dcon-setup ( -- ) dcon-port to smb-port h# 1a to smb-slave ; +: smb-init ( -- ) dcon-setup smb-on smb-pulses ; + +: dcon@ ( reg# -- word ) dcon-setup smb-word@ ; +: dcon! ( word reg# -- ) dcon-setup smb-word! ;
Property changes on: dev/olpc/viacamera/smbus.fth ___________________________________________________________________ Added: svn:executable + *
openfirmware@openfirmware.info
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svn＠openfirmware.info