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Raspberry Pi

Roys Rolls

Flash proof

The Raspberry Pi is a cheap and simple Linux compatible computer with high speed GPIO. Read all about it here.

GPIO

The board has male GPIO header pins. The plus models and version 2 have 40 pins, the original models 26 pins.

                +---P1---+
3V3             01      02 5V
GPIO0/GPIO2     03 A/A+ 04 5V
GPIO1/GPIO3     05 B/B+ 06 GND
GPIO4           07 2    08 GPIO14/TX
GND             09      10 GPIO15/RX
GPIO17          11      12 GPIO18
GPIO21/GPIO27   13      14 GND
GPIO22          15      16 GPIO23
3V3             17      18 GPIO24
GPIO10          19      20 GND
GPIO9           21      22 GPIO25
GPIO11          23      24 GPIO8
GND             25______26 GPIO7
EEPROM ID_SD    27      28 EEPROM ID_SC
GPIO5           29 A+   30 GND
GPIO6           31 B+   32 GPIO12
GPIO13          33 2    34 GND
GPIO19          35      36 GPIO16
GPIO26          37      38 GPIO20
GND             39      40 GPIO21
                +--------+

Ribbon cables may be used to extend the GPIOs. In this instance a female presentation will be given.

For the older models, a 26-pin ribbon is needed, this is much like an old midi daughter-board cable.

  _________________________________________
 /                                        /
-----------------------------------------+
|  7  8 25 0V 24 23 0V 18 15 14 0V 5V 5V |
|                                        |
|                                        |
| 0V 11  9 10 3V 22 27 17 0V  4  3  2 3V |1
+-------------------__-------------------+

For PLUS and version 2 models an old style 40-pin IDE ribbon cable may be re-purposed as a GPIO extension.

  ______________________________________________________________
 /                                                             /
+-------------------------------------------------------------+
| 21 20 16 0V 12 0V SC  7  8 25 0V 24 23 0V 18 15 14 0V 5V 5V |
|                                                             |
|                                                             |
| 0V 26 19 13  6  5 SD 0V 11  9 10 3V 22 27 17 0V  4  3  2 3V |1
+-----------------------------___-----------------------------+

Pickle Microchip PIC ICSP

Using the RPi GPIOs we can program PICMicros using Pickle Microchip PIC ICSP.

High Voltage Programming with Vellman K8048
Low Voltage Programming with VPP at 3V3

The following connections refer to the R-PI GPIO header directly. Ensure that power is only ever applied from GPIO 3V3 on PIN 1 and never 5V.

Single common data I/O connection (RPI or GPIO bit-bang driver for R-PI & OpenWRT)

 R-PI                              PICMicro       GPIO header     .k8048
 ====                              ========       ===========     ======

 3V3-------------------------------VDD--+         PIN 1 (P1-01)
                                        |
 GND-------------------------------VSS  R1        PIN 6
                                        |
 GPIO04--------R3-470R-------------VPP--+         PIN 7           VPP=4

 GPIO25--------R4-470R-------------PGC            PIN 22          PGC=25

 GPIO24--------R5-470R-------------PGD            PIN 18          PGD=24

 GPIO22--------R6-470R-------------PGM--R2-+      PIN 15          PGM=22
                                           |
                                          ///
(R1) 10K !MCLR pull-up
(R2) 10K where appropriate (PGM is not present on all devices).
(R3..R6) 470R.
Display LVP device identity without PGM
p16 lvp id
[000000] [PROGRAM]    10000 WORDS
[01FFF8] [CONFIG1]     F7BA
[01FFFA] [CONFIG2]     FA10
[01FFFC] [CONFIG3]     F8F1
[01FFFE] [CONFIG4]     F980
[3FFFFE] [DEVICEID]    5A61 DEV:5A60 (5A:3) REV:1 PIC18LF27J53
Display LVP device identity with PGM
p14 id
[0000] [PROGRAM]  2000 WORDS
[2000] [USERID0]  0001 .
[2001] [USERID1]  0002 .
[2002] [USERID2]  0003 .
[2003] [USERID3]  0004 .
[2004] [RESERVED] 3FFF .
[2005] [RESERVED] 3FFF .
[2006] [DEVICEID] 2062 DEV:2060 (103) REV:2 PIC16F886
[2007] [CONFIG1]  30E2
[2008] [CONFIG2]  3EFF
[2009] [CALIB]    2278
[2100] [DATA]     0100 BYTES
Program and verify LVP device with PGM
p14 program pic16f886.hex
Total: 732
p14 verify pic16f886.hex
Total: 732 Fail: 0

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