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px4-firmware/nuttx/configs/pic32-starterkit/README.txt

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configs/pic32-starterkit README
===============================
This README file discusses the port of NuttX to the Microchip PIC32 Ethernet
Starter Kit (DM320004) with either
1) The Multimedia Expansion Board (MEB, DM320005), or
2) The Starter Kit I/O Expansion Board
See www.microchip.com for further information.
The PIC32 Ethernet Starter Kit includes:
- PIC32MX795F512L 32-bit microcontroller.
- PIC32MX795F512L USB microcontroller for on-board debugging.
- Green power indicator LED.
- Orange debug indicator LED.
- Three user-defined indicator LEDs.
- Ethernet 10/100 bus speed indicator LED.
- Three push button switches for user-defined inputs.
- On-board crystal for precision microcontroller clocking (8 MHz).
- 50 MHz Ethernet PHY oscillator.
- 32 kHz oscillator (optional).
- USB connectivity for on-board debugger communications.
- USB Host and OTG power supply for powering PIC32 USB applications.
- USB Type A receptacle connectivity for PIC32 host-based applications.
- USB Type micro-AB receptacle for OTG and USB device connectivity for PIC32
OTG/device-based applications.
- RJ-45 Ethernet port (External Ethernet PHY).
The MEB adds:
- 3.2 inch (8.1 cm) QVGA touch screen display with backlight
- Solomon Systech Graphics Controller (SSD1926)
- Five user-controlled LEDs
- Power LED
- Four-way joystick
- Fire button
- Headphone jack
- Line output jack
- Microphone input jack
- microSD card slot.
- Accelerometer and temperature sensor
- 24LC08 EEPROM.
- SPI Flash
- 24-bit audio codec
- CPLD for SPI and Chip Select configuration
- Integrated 802.11 wireless connectivity
The Starter Kit I/O Expansion Board:
Mostly just brings out all of the pins from the tiny Starter Kit connector.
Contents
========
PIC32MX795F512L Pin Out
MEB Connector
PICtail
Serial Output using the
Toolchains
Creating Compatible NuttX HEX files
Serial Console: MEB
Serial Console: Starter Kit I/O Expansion Board
LEDs
PIC32MX Configuration Options
Configurations
PIC32MX795F512L Pin Out
=======================
LEFT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
--- ---------------------------------- -------------------------- -----------------------------------------------
PIN CONFIGURATIONS SIGNAL NAME ON-BOARD CONNECTIONS
(Family Data Sheet Table 1-1) (Starter Kit User Guide)
--- ---------------------------------- -------------------------- -----------------------------------------------
1 RG15/AERXERR ERXERR Ethernet RX_ER/MDIX_IN
2 VDD P32_VDD ---
3 PMD5/RE5 PMPD5/RE5 J2 pin 13
4 PMD6/RE6 PMPD6/RE6 J2 pin 9
5 PMD7/RE7 PMPD7/RE7 J2 pin 7
6 RC1/T2CK T2CLK/RC1 J2 pin 35 (timer)
7 RC2/AC2TX/T3CK T3CLK/RC2 J2 pin 37 (timer)
8 RC3/AC2RX/T4CK T4CLK/RC3 J2 pin 39 (timer)
9 RC4/SDI1/T5CK SDI1/T4CLK/RC4 J2 pin 41 (timer)
J2 pin 93 (SPI1)
10 PMA5/CN8/ECOL/RG6/SCK2/U3RTS/U6TX PMPA5/SCM2C/CN8/RG6 J2 pin 45 (SPI2)
J2 pin 117 (PMP address)
11 PMA4/CN9/ECRS/RG7/SDA4/SDI2/U3RX PMPA4/SCM2A/CN9/RG7 J2 pin 47 (SPI2)
J2 pin 119 (PMP address)
12 PMA3/AECRSDV/AERXDV/CN10/ECRSDV/ ECRS_DV Ethernet CRS/CRS_DV/LED_CFG
ERXDV/RG8/SCL4/SDO2/U3TX
13 MCLR PIC32_MCLR (pulled up)
PIC32MX440F512H debug processor
J2 pin 130 (ICSP)
14 PMA2/AEREFCLK/AERXCLK/CN11/ EREF_CLK 50MHz clock, Ethernet X1
EREFCLK/ERXCLK/RG9/SS2/U3CTS/
U6RX
15 VSS (grounded) ---
16 VDD P32_VDD ---
17 RA0/TMS TMS/RA0 J2 pin 126 (JTAG/GPIO)
18 AERXD0/INT1/RE8 ERXD0(2) Ethernet RXD_0/PHYAD1
19 AERXD1/INT2/RE9 ERXD1(2) Ethernet RXD_1/PHYAD2
20 AN5/C1IN+/CN7/RB5/VBUSON VBUSON/C1IN+/AN5/CN7/RB5 USB host power supply, TPS20x1B ~EN,
Low enables power to host port (J4)
USB OTG power supply, MCP1253_MSOP ~SHDN
Enables power to device/OTG port (J5)
J2 pin 63 (comparator 1)
J2 pin 62 (A/D)
21 AN4/C1IN-/CN6/RB4 USBOEN/C1IN-/AN4/CN6/RB4 J2 pin 65 (comparator 1)
J2 pin 64 (A/D)
22 AN3/C2IN+/CN5/RB3 C2IN+/AN3/CN5/RB3 TPS20x1B ~OC, sense host port power
MCP1253_MSOP PGOOD, sense device/OTG port power
J2 pin 67 (comparator 2)
J2 pin 66 (A/D)
23 AN2/C2IN-/CN4/RB2 C2IN-/AN2/CN4/RB2 J2 pin 69 (comparator 2)
J2 pin 101
J2 pin 68 (A/D)
24 AN1/CN3/PGEC1/RB1 PGC1/AN1/CN3/RB1 J2 pin 70 (A/D)
25 AN0/CN2/PGED1/RB0 PGD1/AN0/CN2/RB0 J2 pin 72 (A/D)
BOTTOM SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
--- ---------------------------------- -------------------------- -----------------------------------------------
PIN CONFIGURATIONS SIGNAL NAME ON-BOARD CONNECTIONS
(Family Data Sheet Table 1-1) (Starter Kit User Guide)
--- ---------------------------------- -------------------------- -----------------------------------------------
26 AN6/OCFA/PGEC2/RB6 PIC32_PGC2 PIC32MX440F512H debug processor
J2 pin 128 (ICSP)
27 AN7/PGED2/RB7 PIC32_PGD2/DBG_SD0 PIC32MX440F512H debug processor
J2 pin 132 (ICSP)
28 PMA7/AERXD2/CVREF-/RA9 PMPA7/VREF-/RA9 J2 pin 113 (PMP address)
J2 pin 114 (A/D ref)
29 PMA6/AERXD3/CVREF+/RA10/VREF+ PMPA6/VREF+/RA10 J2 pin 115 (PMP address)
J2 pin 116 (A/D ref)
30 AVDD P32_VDD ---
31 AVSS (grounded) ---
32 AN8/C1OUT/RB8 C1OUT/AN8/RB8 J2 pin 71
33 AN9/C2OUT/RB9 C2OUT/AN9/RB9 J2 pin 73
34 PMA13/AN10/RB10/CVREFOUT PMPA13/CVREF/AN10 J2 pin 101 (PMP address)
J2 pin 102 (Comparator ref)
35 PMA12/AETXERR/AN11/ERXERR/RB11 PMPA12/AN11/RB11 J2 pin 103 (PMP address)
36 VSS (grounded) ---
37 VDD P32_VDD ---
38 RA1/TCK TCK/RA1 PIC32MX440F512H debug processor
J2 pin 124 (JTAG/GPIO)
39 AC1TX/RF13/SCK4/U2RTS/U5TX SCM3D/BCLK2/RF13 J2 pin 106 (UART2)
40 AC1RX/RF12/SS4/U2CTS/U5RX SCM3C/RF12 J2 pin 108 (UART2)
41 PMA11/AECRS/AN12/ERXD0/RB12 PMPA11/AN12/RB12 J2 pin 105 (PMP address)
42 PMA10/AECOL/AN13/ERXD1/RB13 PMPA10/AN13/RB13 J2 pin 107 (PMP address)
43 PMA1/AETXD3/AN14/ERXD2/PMALH/RB14 PMPA1/AN14/RB14 J2 pin 127 (PMP address)
44 PMA0/AETXD2/AN15/CN12/ERXD3/OCFB/ PMPA0/AN15/OCFB/CN12 J2 pin 129 (PMP address)
PMALL/RB15 J2 pin 36
45 VSS (grounded) ---
46 VDD P32_VDD ---
47 AETXD0/CN20/RD14/SS3/U1CTS/U4RX EXTD0(2) Ethernet TXD_0
48 AETXD1/CN21/RD15/SCK3/U1RTS/U4TX EXTD1(2) Ethernet TXD_1
49 PMA9/CN17/RF4/SDA5/SDI4/U2RX PMPA9/SCM3A/CN17/RF4 J2 pin 109 (PMP address)
J2 pin 110 (UART2)
50 PMA8/CN18/RF5/SCL5/SDO4/U2TX PMPA8/SCM3B/CN18/RF5 J2 pin 111 (PMP address)
J2 pin 112 (UART2)
RIGHT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
--- ---------------------------------- -------------------------- -----------------------------------------------
PIN CONFIGURATIONS SIGNAL NAME ON-BOARD CONNECTIONS
(Family Data Sheet Table 1-1) (Starter Kit User Guide)
--- ---------------------------------- -------------------------- -----------------------------------------------
75 VSS (grounded)
74 CN0/RC14/SOSCO/T1CK SOSC0/T1CK/CN0/RC14 32kHz Oscillator, J2 pin (timer)
J2 pin 32 (secondary OSC)
73 CN1/RC13/SOSCI SOSC1/CN1/RC13 32kHz Oscillator
J2 pin 32 (secondary OSC)
72 OC1/INT0/RD0/SDO1 SDO1/INT0/OC1/RD0 User LED D4 (high illuminates)
J2 pin 87 (EXT_INT)
J2 pin 95 (SPI1)
J2 pin 46 (OC/PWM)
71 PMA14/AEMDC/EMDC/IC4/PMCS1/RD11 EMDC Ethernet MDC
70 PMA15/IC3/PMCS2/RD10/SCK1 SCK1/IC3/PMPCS2/RD10 J2 pin 29 (PMP control)
J2 pin 91 (SPI1)
J2 pin 52 (input capture)
69 IC2/RD9/SS1 SS1/IC2/RD9 J2 pin 54 (input capture)
68 AEMDIO/EMDIO/IC1/RD8/RTCC EMDIO Ethernet MDIO
67 AETXEN/INT4/RA15/SDA1 ETXEN(2) Ethernet TX_EN
66 AETXCLK/INT3/RA14/SCL1 INT3/SCL1/RA14 Ethernet PWR_DOWN/INT
65 VSS (grounded) ---
64 CLKO/OSC2/RC15 8MHz crystal
63 CLKI/OSC1/RC12 8MHz crystal
62 VDD P32_VDD ---
61 RA5/TDO TDO/RA5 PIC32MX440F512H debug processor
J2 pin 118 (JTAG/GPIO)
60 RA4/TDI TDI/RA4 PIC32MX440F512H debug processor
59 RA3/SDA2 SDA2/RA3 J2 pin 74 (I2C2)
58 RA2/SCL2 SCL2/RA2 J2 pin 76 (I2C2)
57 D+/RG2 D+/RG2 Host port (J4), Device OTG port (J5)
56 D-/RG3 D-/RG3 Host port (J4), Device OTG port (J5)
55 VUSB P32_VDD ---
54 VBUS P32_VBUS ---
53 RF8/SCL3/SDO3/U1TX SCM1B/RF8 J2 pin 90 (UART1)
52 RF2/SDA3/SDI3/U1RX SCM1A/RF2 J2 pin 88 (UART1)
51 RF3/USBID USBID/RF3 Device OTG port (J5)
TOP SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
--- ---------------------------------- -------------------------- -----------------------------------------------
PIN CONFIGURATIONS SIGNAL NAME ON-BOARD CONNECTIONS
(Family Data Sheet Table 1-1) (Starter Kit User Guide)
--- ---------------------------------- -------------------------- -----------------------------------------------
100 PMD4/RE4 PMPD4/RE4 J2 pin 15 (PMP data)
99 PMD3/RE3 PMPD3/RE3 J2 pin 17 (PMP data)
98 PMD2/RE2 PMPD2/RE2 J2 pin 19 (PMP data)
97 RG13/TRD0 TRD0/RG13 J2 pin 8 (Trace/GPIO)
96 RG12/TRD1 TRD1/RG12 J2 pin 5
95 RG14/TRD2 TRD2/RG14 J2 pin 3
94 PMD1/RE1 PMPD1/RE1 J2 pin 21 (PMP data)
93 PMD0/RE0 PMPD0/RE0 J2 pin 23 (PMP data)
92 RA7/TRD3 TRD3/RA7 J2 pin 6 (Trace/GPIO)
91 RA6/TRCLK TRCLK/RA6 J2 pin 4 (Trace/GPIO)
90 PMD8/C2RX/RG0 PMPD8/RG0 J2 pin 10 (PMP data)
89 PMD9/C2TX/ETXERR/RG1 PMPD9/RG1 J2 pin 14 (PMP data)
88 PMD10/C1TX/ETXD0/RF1 PMPD10/RF1 J2 pin 16 (PMP data)
87 PMD11/C1RX/ETXD1/RF0 PMPD11/RF0 J2 pin 18 (PMP data)
86 VDD P32_VDD ---
85 VCAP/VCORE (capacitor to ground) ---
84 PMD15/CN16/ETXCLK/RD7 PMPD15/CN16/RD7 Switch SW2 (low when closed)
J2 pin 26 (PMP data)
83 PMD14/CN15/ETXEN/RD6 PMPD14/CN15/RD6 Switch SW1 (low when closed)
J2 pin 24 (PMP data)
82 CN14/PMRD/RD5 PMPRD/CN14/RD5 J2 pin 25
81 CN13/OC5/PMWR/RD4 PMPWR/OC5/C13/RD4 J2 pin 28 (PMP control)
J2 pin 38
80 PMD13/CN19/ETXD3/RD13 CN19/PMPD13/RD13 Switch SW3 (low when closed)
J2 pin 22 (PMP data)
79 PMD12/ETXD2/IC5/RD12 IC5/PMPD12/RD12 J2 pin 20 (PMP data)
J2 pin 48
78 OC4/RD3 OC4/RD3 J2 pin 40 (OC/PWM)
77 OC3/RD2 OC3/RD2 User LED D5 (high illuminates)
J2 pin 42 (OC/PWM)
76 OC2/RD1 OC1/RD1 User LED D6 (high illuminates)
J2 pin 44 (OC/PWM)
MEB Connector
=============
The following table summarizes how the pins brought the the MEB through the
J2 on the Ethernet Starter Kit are mapped. This connect is J2 on the Ethernet
Starter Kit and J3 on the MEB.
J3
PIC32 SIGNAL PIN CONNECTION
-------------------------- ------- ----------------------------------
PMPD0 pin 23 Graphics Controller (SSD1926)
PMPD1 pin 21 8-bit or 16-bit Data Bus
PMPD2 pin 19
PMPD3 pin 17
PMPD4 pin 15
PMPD6 pin 9
PMPD7 pin 7
-------------------------- ------- ----------------------------------
PMPD8 pin 10 Graphics Controller (SSD1926)
PMPD9 pin 14 16-bit Data Bus
PMPD10 pin 16
PMPD11 pin 18
PMPD12 pin 20
PMPD13 pin 22
PMPD14 pin 24
PMPD15 pin 26
-------------------------- ------- ----------------------------------
Graphics Controller (SSD1926)
RG13 pin 8 Chip select
RB10 pin 101 Register select
RC3 pin 39 Wait line
RA10 pin 115 Reset (see MRF24WBOMA and PICtail)
-------------------------- ------- ----------------------------------
Touchscreen
RB11 pin 103 X+
RB12 pin 105 Y-
RB13 pin 107 X-
RB14 pin 127 Y+
-------------------------- ------- ----------------------------------
Joystick
CN2/RB0 pin 72 Left
CN3/RB1 pin 70 Up
CN5/RB3 pin 66 Down
CN6/RB4 pin 64 Right
CN12/RB15 pin 36 Fire
-------------------------- ------- ----------------------------------
LEDs
RD1 pin 44 LED1
RD2 pin 42 LED2
RD3 pin 40 LED3
RC1 pin 35 LED4
RC2 pin 37 LED5
-------------------------- ------- ----------------------------------
SDA2 pin 74 I2C2 bus for BMA150, MCHP24LC08
SCL2 pin 76 and WM8731 (see also MRF24WBOMA)
-------------------------- ------- ----------------------------------
SCK1 pin 91 SPI1 bus for WM8731
SDI1 pin 93
SDO1 pin 95
-------------------------- ------- ----------------------------------
RA6 pin 4 CPLD
RA7 pin 6
RG12 pin 5
RG14 pin 3
SCK2 pin 45 (see MRF24WBOMA)
SDI2 pin 47 (see MRF24WBOMA)
SDO2 pin 49 (see MRF24WBOMA)
RG9 pin 51 (see MRF24WBOMA)
SCK3A pin 106 (see PICtail)
SDI3A pin 110 (see PICtail)
SDO3A pin 112 (see PICtail)
RF12 pin 108 (see PICtail)
~SSI pin 97 (see PICtail)
RD9 pin 54
-------------------------- ------- ----------------------------------
INT3 pin 81 MRF24WBOMA
RA10 pin 115 (also Graphics Controller and PICtail)
RB8 pin 71
-------------------------- ------- ----------------------------------
PICtail J5
SDA2 pin 74 I2C2 bus (see above)
SCL2 pin 76 I2C2 bus (see above)
SCK2 pin 45 (see CPLD)
SDI2 pin 47 (see CPLD)
SDO2 pin 49 (see CPLD)
RG9 pin 51 (see CPLD)
U1RX pin 88
U1TX pin 90
~U1RTS pin 92
~U1CTS pin 94
RB9 pin 73
RA10 pin 115 Reset (see Graphics controller and MRF24WBOMA)
INT1 pin 85
SCL1 pin 84
SDA1 pin 86 (see CPLD)
~SSI pin 97 (see CPLD)
U2RX pin 110 (see CPLD)
U2TX pin 112 (see CPLD)
~U2RTS pin 106 (see CPLD)
~U2CTS pin 108 (see CPLD)
PICtail
=======
The MEB brings many of the signals out via the PICtail (J5). J5 is
a 28 pin connector bringing out signals as summarized here (J3 is the
designation of the connection to the Ethernet starter kit on the
MEB side):
--- --- ------------------------
J3 J5 Table 2-1
PIN PIN Description
--- --- ------------------------
1 3.3V
2 I/O_4 (Test Point)
76 3 SCL2
84 4 SCL1
74 5 SDA2
86 6 SDA1
47 7 SDI2/SDI2A/CN9/RG7
97 8 SS1, WFI_SDO
49 9 SDO2/SDO2A
10 WFI_SDI
45 11 SCK2/SCK2A
12 WFI_SCK
51 13 SS2/SS2A/RG9
14 SS1/RB2
88 15 U1RX/SDI1A
110 16 U2RX/SDI3A
90 17 U1TX/RA10
112 18 U2TX/SDO3A
92 19 U1RTS/C2OUT/AN9
106 20 U2RTS/SCK3A
94 21 U1CTS/SDO1A
108 22 U2CTS/SS3A/RF12
73 23 RB9/INT1/RE8
115 25 RA10/SCK1A
26 3.3V
85 27 INT1/SS1/RD14
28 GND
Toolchains
==========
I am using the free, LITE version of the PIC32MX toolchain available
for download from the microchip.com web site. I am using the Windows
version. The MicroChip toolchain is the only toolchaing currently
supported in these configurations, but it should be a simple matter to
adapt to other toolchains by modifying the Make.defs file include in
each configuration.
Toolchain Options:
CONFIG_PIC32MX_MICROCHIPW - MicroChip full toolchain for Windows
CONFIG_PIC32MX_MICROCHIPL - MicroChip full toolchain for Linux
CONFIG_PIC32MX_MICROCHIPW_LITE - MicroChip LITE toolchain for Windows
CONFIG_PIC32MX_MICROCHIPL_LITE - MicroChip LITE toolchain for Linux
Windows Native Toolchains
NOTE: There are several limitations to using a Windows based toolchain in a
Cygwin environment. The three biggest are:
1. The Windows toolchain cannot follow Cygwin paths. Path conversions are
performed automatically in the Cygwin makefiles using the 'cygpath' utility
but you might easily find some new path problems. If so, check out 'cygpath -w'
2. Windows toolchains cannot follow Cygwin symbolic links. Many symbolic links
are used in Nuttx (e.g., include/arch). The make system works around these
problems for the Windows tools by copying directories instead of linking them.
But this can also cause some confusion for you: For example, you may edit
a file in a "linked" directory and find that your changes had no effect.
That is because you are building the copy of the file in the "fake" symbolic
directory. If you use a Windows toolchain, you should get in the habit of
making like this:
make clean_context all
An alias in your .bashrc file might make that less painful.
3. Dependencies are not made when using Windows versions of the GCC. This is
because the dependencies are generated using Windows pathes which do not
work with the Cygwin make.
Support has been added for making dependencies with the windows-native toolchains.
That support can be enabled by modifying your Make.defs file as follows:
- MKDEP = $(TOPDIR)/tools/mknulldeps.sh
+ MKDEP = $(TOPDIR)/tools/mkdeps.sh --winpaths "$(TOPDIR)"
If you have problems with the dependency build (for example, if you are not
building on C:), then you may need to modify tools/mkdeps.sh
Powering the Board
==================
Ethernet Starter Kit:
There are two ways to supply power to the PIC32 Ethernet Starter Kit:
- USB bus power connected to USB debug connector J1.
- An external application board with a regulated DC power supply that
provides +5V can be connected to the J2 application board connector
that is provided on the bottom side of the board.
One green LED (D3) is provided to show that the PIC32 microcontroller
is powered up.
Ethernet Starter Kit with MEB:
Power can be supplied to the Multimedia Expansion Board through the DC
connector located on the Multimedia Expansion Board... By connecting
9-14V power supply to the DC connector, the Multimedia Expansion Board
and starter kit will receive the proper voltages. The user can also
supply power via the starter kit. However, if the application uses
multiple features of the Multimedia Expansion Board, it is recommended
to use 9-14V power supply."
On Board Debug Support
======================
The PIC32 Ethernet Starter Kit includes a PIC32MX440F512H USB microcontroller
that provides debugger connectivity over USB. The PIC32MX440F512H is hard-wired
to the PIC32 device to provide two types of protocol translation:
- I/O pins of PIC32MX440F512H to the ICSP<53> pins of the PIC32
- I/O pins of PIC32MX440F512H to the JTAG pins of the PIC32
The PIC32 Ethernet Starter Kit currently uses the JTAG pins of the PIC32 device for
programming and debugging.
Creating Compatible NuttX HEX files
===================================
Intel Hex Format Files:
-----------------------
When NuttX is built it will produce two files in the top-level NuttX
directory:
1) nuttx - This is an ELF file, and
2) nuttx.hex - This is an Intel Hex format file. This is controlled by
the setting CONFIG_INTELHEX_BINARY in the .config file.
The PICkit tool wants an Intel Hex format file to burn into FLASH. However,
there is a problem with the generated nutt.hex: The tool expects the nuttx.hex
file to contain physical addresses. But the nuttx.hex file generated from the
top-level make will have address in the KSEG0 and KSEG1 regions.
tools/mkpichex:
---------------
There is a simple tool in the configs/pic32-starterkit/tools directory
that can be used to solve both issues with the nuttx.hex file. But,
first, you must build the the tools:
cd configs/pic32-starterkit/tools
make
Now you will have an excecutable file call mkpichex (or mkpichex.exe on
Cygwin). This program will take the nutt.hex file as an input, it will
convert all of the KSEG0 and KSEG1 addresses to physical address, and
it will write the modified file, replacing the original nuttx.hex.
To use this file, you need to do the following things:
. ./setenv.sh # Source setenv.sh. Among other this, this script
# will add configs/pic32-starterkit/tools to your
# PATH variable
make # Build nuttx and nuttx.hex
mkpichex $PWD # Convert addresses in nuttx.hex. $PWD is the path
# to the top-level build directory. It is the only
# required input to mkpichex.
Serial Console: MEB
===================
[[Warning: This all sounds great, but the fact is that I have not yet
gotten any serial UART output to work from the MEB.]]
A serial console is not required to use NuttX. However, all of the
Nuttx example code in the apps/examples assumes that you have a
serial console. The Ethernet Starter Kit(even with the MEB) does not
have any RS-232 connector needed to drive the serial console.
Raw UART signals are available at the MEB's PICtail connector, however,
and can be connected to an external MAX2232 board to get a serial console.
The defconfig files are set up to use UART2. So the proper connections
would be:
PICtail
PIN FUNCTION
-------- -----------
1 3.3V
16 U2RX
18 U2TX
28 GND
UART1 is also brought out on the PICtail and would be connected as:
PICtail
PIN FUNCTION
-------- -----------
1 3.3V
15 U1RX
17 U1TX
28 GND
Here is a summary of the tortuous routes taken by the PIC32MX UART pins:
--- ---------------------------------- -------------------------- -------------------------
PIN CONFIGURATIONS SIGNAL NAME ON-BOARD CONNECTIONS
(Family Data Sheet Table 1-1) (Starter Kit User Guide)
--- ---------------------------------- -------------------------- -------------------------
39 AC1TX/RF13/SCK4/U2RTS/U5TX SCM3D/BCLK2/RF13 J2 pin 106 (UART2)
40 AC1RX/RF12/SS4/U2CTS/U5RX SCM3C/RF12 J2 pin 108 (UART2)
49 PMA9/CN17/RF4/SDA5/SDI4/U2RX PMPA9/SCM3A/CN17/RF4 J2 pin 109 (PMP address)
J2 pin 110 (UART2)
50 PMA8/CN18/RF5/SCL5/SDO4/U2TX PMPA8/SCM3B/CN18/RF5 J2 pin 111 (PMP address)
J2 pin 112 (UART2)
52 RF2/SDA3/SDI3/U1RX SCM1A/RF2 J2 pin 88 (UART1)
53 RF8/SCL3/SDO3/U1TX SCM1B/RF8 J2 pin 90 (UART1)
J2 is the connector at the bottom of the Ethernet start kit that
mates the Ethernet Starter kit to the MEB. The MEB then makes the
following signals available on the PICtail (J5):
MEB Connector:
-------------------------- ------- ----------------------------------
Signal J3
-------------------------- -------
U1RX pin 88
U1TX pin 90
~U1RTS pin 92
~U1CTS pin 94
U2RX pin 110
U2TX pin 112
~U2RTS pin 106
~U2CTS pin 108
-------------------------- -------
PICtail:
The pins are labeled differently in Table 2-1 and in the schematic. This is
confusing. I will trust Table 2-1.
--- --- ------- --- --- -----------------
Table 2-1 Schematic
J3 J5 J3 J5
PIN PIN NAME PIN PIN Description
--- --- ------- ---- --- ------------
1 3.3V
88 15 U1RX 88 15 SDI1A
110 16 U2RX 110 16 SDI3A
90 17 U1TX 17 RA10
90 SD01A
112 18 U2TX 113 18 SDO3A
92 19 U1RTS 19 C2OUT/AN9
92 SCK1A
106 20 U2RTS 106 20 SCK3A
94 21 U1CTS 21 SDO1A
94 SS1/RD14
108 22 U2CTS 108 22 SS3A/RF12
26 3.3V
28 GND
Serial Console: Starter Kit I/O Expansion Board
===============================================
U1:
Ethernet Starter Kit Expansion I/O board
--------------------------------------------- -------------------------
PIN Description J2 J1 J10/J11
--- ---------------------------------- ------------- ------------------
47 AETXD0/CN20/RD14/SS3/U1CTS/U4RX Not available N/A
48 AETXD1/CN21/RD15/SCK3/U1RTS/U4TX Not available N/A
52 RF2/SDA3/SDI3/U1RX J2 pin 88 J11 pin 41
53 RF8/SCL3/SDO3/U1TX J2 pin 90 J11 pin 43
U2:
Ethernet Starter Kit Expansion I/O board
--------------------------------------------- -------------------------
PIN Description J2 J1 J10/J11
--- ---------------------------------- ------------- ------------------
39 AC1TX/RF13/SCK4/U2RTS/U5TX J2 pin 106 J11 pin 42
40 AC1RX/RF12/SS4/U2CTS/U5RX J2 pin 108 J11 pin 44
50 PMA8/CN18/RF5/SCL5/SDO4/U2TX J2 pin 111 J10 pin 52
J2 pin 112 J11 pin 48
49 PMA9/CN17/RF4/SDA5/SDI4/U2RX J2 pin 109 J10 pin 51
J2 pin 110 J11 pin 46
U3:
Ethernet Starter Kit Expansion I/O board
--------------------------------------------- -------------------------
PIN Description J2 J1 J10/J11
--- ---------------------------------- ------------- ------------------
10 PMA5/CN8/ECOL/RG6/SCK2/U3RTS/U6TX J2 pin 45 J10 pin 23
J2 pin 117 J10 pin 55
11 PMA4/CN9/ECRS/RG7/SDA4/SDI2/U3RX J2 pin 47 J10 pin 24
J2 pin 119 J10 pin 56
12 PMA3/AECRSDV/AERXDV/CN10/ECRSDV/ Not available N/A
ERXDV/RG8/SCL4/SDO2/U3TX
14 PMA2/AEREFCLK/AERXCLK/CN11/
EREFCLK/ERXCLK/RG9/SS2/U3CTS/ Not available N/A
U6RX
U4:
Ethernet Starter Kit Expansion I/O board
--------------------------------------------- -------------------------
PIN Description J2 J1 J10/J11
--- ---------------------------------- ------------- ------------------
47 AETXD0/CN20/RD14/SS3/U1CTS/U4RX Not available N/A
48 AETXD1/CN21/RD15/SCK3/U1RTS/U4TX Not available N/A
U5:
Ethernet Starter Kit Expansion I/O board
--------------------------------------------- -------------------------
PIN Description J2 J1 J10/J11
--- ---------------------------------- ------------- ------------------
39 AC1TX/RF13/SCK4/U2RTS/U5TX J2 pin 106 J11 pin 42
40 AC1RX/RF12/SS4/U2CTS/U5RX J2 pin 108 J11 pin 44
U6:
PIN Description
--- ----------------------------------
10 PMA5/CN8/ECOL/RG6/SCK2/U3RTS/U6TX J2 pin 45 J10 pin 23
J2 pin 117 J10 pin 55
14 PMA2/AEREFCLK/AERXCLK/CN11/ Not available N/A
EREFCLK/ERXCLK/RG9/SS2/U3CTS/
U6RX
LEDs
====
The PIC32MX Ethernet Starter kit has 3 user LEDs labeled LED1-3 on the
board graphics (but referred to as LED4-6 in the schematic):
PIN User's Guide Board Stencil Notes
--- ------------- -------------- -------------------------
RD0 "User LED D4" "LED1 (RD0") High illuminates (RED)
RD2 "User LED D5" "LED3 (RD2)" High illuminates (YELLOW)
RD1 "User LED D6" "LED2 (RD1)" High illuminates (GREEN)
We will use the labels on the board to identify LEDs. If CONFIG_ARCH_LEDS
is defined, then NuttX will control these LEDs as follows:
ON OFF
------------------------- ---- ---- ---- ---- ---- ----
LED1 LED2 LED3 LED1 LED2 LED3
------------------------- ---- ---- ---- ---- ---- ----
LED_STARTED 0 OFF OFF OFF --- --- ---
LED_HEAPALLOCATE 1 ON OFF N/C --- --- ---
LED_IRQSENABLED 2 OFF ON N/C --- --- ---
LED_STACKCREATED 3 ON ON N/C --- --- ---
LED_INIRQ 4 N/C N/C ON N/C N/C OFF
LED_SIGNAL 4 N/C N/C ON N/C N/C OFF
LED_ASSERTION 4 N/C N/C ON N/C N/C OFF
LED_PANIC 5 ON N/C N/C OFF N/C N/C
There are 5 additional LEDs available on the MEB. These are not
used by NuttX.
RD1 LED1
RD2 LED2
RD3 LED3
RC1 LED4
RC2 LED5
PIC32MX Configuration Options
=============================
General Architecture Settings:
CONFIG_ARCH - Identifies the arch/ subdirectory. This should
be set to:
CONFIG_ARCH=mips
CONFIG_ARCH_family - For use in C code:
CONFIG_ARCH_MIPS=y
CONFIG_ARCH_architecture - For use in C code:
CONFIG_ARCH_MIPS32=y
CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
CONFIG_ARCH_CHIP=pic32mx
CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
chip:
CONFIG_ARCH_CHIP_PIC32MX795F512L=y
CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
hence, the board that supports the particular chip or SoC.
CONFIG_ARCH_BOARD=pic32-starterkit
CONFIG_ARCH_BOARD_name - For use in C code
CONFIG_ARCH_BOARD_PIC32_STARTERKIT=y
CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
of delay loops
CONFIG_ENDIAN_BIG - define if big endian (default is little
endian)
CONFIG_DRAM_SIZE - Describes the installed DRAM (CPU SRAM in this case):
CONFIG_DRAM_SIZE=(32*1024) (32Kb)
There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1.
CONFIG_DRAM_START - The start address of installed DRAM
CONFIG_DRAM_START=0x10000000
CONFIG_DRAM_END - Last address+1 of installed RAM
CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
CONFIG_ARCH_IRQPRIO=y
CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
have LEDs
CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
stack. If defined, this symbol is the size of the interrupt
stack in bytes. If not defined, the user task stacks will be
used during interrupt handling.
CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture.
CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
cause a 100 second delay during boot-up. This 100 second delay
serves no purpose other than it allows you to calibratre
CONFIG_ARCH_LOOPSPERMSEC. You simply use a stop watch to measure
the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
the delay actually is 100 seconds.
PIC32MX Configuration
CONFIG_PIC32MX_MVEC - Select muli- vs. single-vectored interrupts
Individual subsystems can be enabled:
CONFIG_PIC32MX_WDT - Watchdog timer
CONFIG_PIC32MX_T2 - Timer 2 (Timer 1 is the system time and always enabled)
CONFIG_PIC32MX_T3 - Timer 3
CONFIG_PIC32MX_T4 - Timer 4
CONFIG_PIC32MX_T5 - Timer 5
CONFIG_PIC32MX_IC1 - Input Capture 1
CONFIG_PIC32MX_IC2 - Input Capture 2
CONFIG_PIC32MX_IC3 - Input Capture 3
CONFIG_PIC32MX_IC4 - Input Capture 4
CONFIG_PIC32MX_IC5 - Input Capture 5
CONFIG_PIC32MX_OC1 - Output Compare 1
CONFIG_PIC32MX_OC2 - Output Compare 2
CONFIG_PIC32MX_OC3 - Output Compare 3
CONFIG_PIC32MX_OC4 - Output Compare 4
CONFIG_PIC32MX_OC5 - Output Compare 5
CONFIG_PIC32MX_I2C1 - I2C 1
CONFIG_PIC32MX_I2C2 - I2C 2
CONFIG_PIC32MX_I2C3 - I2C 3
CONFIG_PIC32MX_I2C4 - I2C 4
CONFIG_PIC32MX_I2C5 - I2C 5
CONFIG_PIC32MX_SPI1 - SPI 1
CONFIG_PIC32MX_SPI2 - SPI 2
CONFIG_PIC32MX_SPI3 - SPI 3
CONFIG_PIC32MX_SPI4 - SPI 4
CONFIG_PIC32MX_UART1 - UART 1
CONFIG_PIC32MX_UART2 - UART 2
CONFIG_PIC32MX_UART3 - UART 3
CONFIG_PIC32MX_UART4 - UART 4
CONFIG_PIC32MX_UART5 - UART 5
CONFIG_PIC32MX_UART6 - UART 6
CONFIG_PIC32MX_ADC - ADC 1
CONFIG_PIC32MX_PMP - Parallel Master Port
CONFIG_PIC32MX_CM1 - Comparator 1
CONFIG_PIC32MX_CM2 - Comparator 2
CONFIG_PIC32MX_RTCC - Real-Time Clock and Calendar
CONFIG_PIC32MX_DMA - DMA
CONFIG_PIC32MX_FLASH - FLASH
CONFIG_PIC32MX_USBDEV - USB device
CONFIG_PIC32MX_USBHOST - USB host
CONFIG_PIC32MX_CAN1 - Controller area network 1
CONFIG_PIC32MX_CAN2 - Controller area network 2
CONFIG_PIC32MX_ETHERNET - Ethernet
PIC32MX Configuration Settings
DEVCFG0:
CONFIG_PIC32MX_DEBUGGER - Background Debugger Enable. Default 3 (disabled). The
value 2 enables.
CONFIG_PIC32MX_ICESEL - In-Circuit Emulator/Debugger Communication Channel Select
Default 1 (PG2)
CONFIG_PIC32MX_PROGFLASHWP - Program FLASH write protect. Default 0xff (disabled)
CONFIG_PIC32MX_BOOTFLASHWP - Default 1 (disabled)
CONFIG_PIC32MX_CODEWP - Default 1 (disabled)
DEVCFG1: (All settings determined by selections in board.h)
DEVCFG2: (All settings determined by selections in board.h)
DEVCFG3:
CONFIG_PIC32MX_USBIDO - USB USBID Selection. Default 1 if USB enabled
(USBID pin is controlled by the USB module), but 0 (GPIO) otherwise.
CONFIG_PIC32MX_VBUSIO - USB VBUSON Selection (Default 1 if USB enabled
(VBUSON pin is controlled by the USB module, but 0 (GPIO) otherwise.
CONFIG_PIC32MX_WDENABLE - Enabled watchdog on power up. Default 0 (watchdog
can be enabled later by software).
The priority of interrupts may be specified. The value ranage of
priority is 4-31. The default (16) will be used if these any of these
are undefined.
CONFIG_PIC32MX_CTPRIO - Core Timer Interrupt
CONFIG_PIC32MX_CS0PRIO - Core Software Interrupt 0
CONFIG_PIC32MX_CS1PRIO - Core Software Interrupt 1
CONFIG_PIC32MX_INT0PRIO - External Interrupt 0
CONFIG_PIC32MX_INT1PRIO - External Interrupt 1
CONFIG_PIC32MX_INT2PRIO - External Interrupt 2
CONFIG_PIC32MX_INT3PRIO - External Interrupt 3
CONFIG_PIC32MX_INT4PRIO - External Interrupt 4
CONFIG_PIC32MX_FSCMPRIO - Fail-Safe Clock Monitor
CONFIG_PIC32MX_T1PRIO - Timer 1 (System timer) priority
CONFIG_PIC32MX_T2PRIO - Timer 2 priority
CONFIG_PIC32MX_T3PRIO - Timer 3 priority
CONFIG_PIC32MX_T4PRIO - Timer 4 priority
CONFIG_PIC32MX_T5PRIO - Timer 5 priority
CONFIG_PIC32MX_IC1PRIO - Input Capture 1
CONFIG_PIC32MX_IC2PRIO - Input Capture 2
CONFIG_PIC32MX_IC3PRIO - Input Capture 3
CONFIG_PIC32MX_IC4PRIO - Input Capture 4
CONFIG_PIC32MX_IC5PRIO - Input Capture 5
CONFIG_PIC32MX_OC1PRIO - Output Compare 1
CONFIG_PIC32MX_OC2PRIO - Output Compare 2
CONFIG_PIC32MX_OC3PRIO - Output Compare 3
CONFIG_PIC32MX_OC4PRIO - Output Compare 4
CONFIG_PIC32MX_OC5PRIO - Output Compare 5
CONFIG_PIC32MX_I2C1PRIO - I2C 1
CONFIG_PIC32MX_I2C2PRIO - I2C 2
CONFIG_PIC32MX_I2C3PRIO - I2C 3
CONFIG_PIC32MX_I2C4PRIO - I2C 4
CONFIG_PIC32MX_I2C5PRIO - I2C 5
CONFIG_PIC32MX_SPI2PRIO - SPI 2
CONFIG_PIC32MX_UART1PRIO - UART 1
CONFIG_PIC32MX_UART2PRIO - UART 2
CONFIG_PIC32MX_CN - Input Change Interrupt
CONFIG_PIC32MX_ADCPRIO - ADC1 Convert Done
CONFIG_PIC32MX_PMPPRIO - Parallel Master Port
CONFIG_PIC32MX_CM1PRIO - Comparator 1
CONFIG_PIC32MX_CM2PRIO - Comparator 2
CONFIG_PIC32MX_FSCMPRIO - Fail-Safe Clock Monitor
CONFIG_PIC32MX_RTCCPRIO - Real-Time Clock and Calendar
CONFIG_PIC32MX_DMA0PRIO - DMA Channel 0
CONFIG_PIC32MX_DMA1PRIO - DMA Channel 1
CONFIG_PIC32MX_DMA2PRIO - DMA Channel 2
CONFIG_PIC32MX_DMA3PRIO - DMA Channel 3
CONFIG_PIC32MX_DMA4PRIO - DMA Channel 4
CONFIG_PIC32MX_DMA5PRIO - DMA Channel 5
CONFIG_PIC32MX_DMA6PRIO - DMA Channel 6
CONFIG_PIC32MX_DMA7PRIO - DMA Channel 7
CONFIG_PIC32MX_FCEPRIO - Flash Control Event
CONFIG_PIC32MX_USBPRIO - USB
PIC32MXx specific device driver settings. NOTE: For the Ethernet
starter kit, there is no RS-232 connector (even with the MEB). See
discussion above ("") for information about how you can configure
an external MAX2232 board to get a serial console.
CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
console and ttys0 (default is the UART0).
CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
This specific the size of the receive buffer
CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
being sent. This specific the size of the transmit buffer
CONFIG_UARTn_BAUD - The configure BAUD of the UART. Must be
CONFIG_UARTn_BITS - The number of bits. Must be either 7 or 8.
CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
CONFIG_UARTn_2STOP - Two stop bits
PIC32MX specific PHY/Ethernet device driver settings
CONFIG_PHY_KS8721 - Selects the Micrel KS8721 PHY
CONFIG_PHY_DP83848C - Selects the National Semiconduction DP83848C PHY
CONFIG_PHY_LAN8720 - Selects the SMSC LAN8720 PHY
CONFIG_PHY_AUTONEG - Enable auto-negotion
CONFIG_PHY_SPEED100 - Select 100Mbit vs. 10Mbit speed.
CONFIG_PHY_FDUPLEX - Select full (vs. half) duplex
CONFIG_NET_NTXDESC - Configured number of Tx descriptors. Default: 2
CONFIG_NET_NRXDESC - Configured number of Rx descriptors. Default: 4
CONFIG_NET_PRIORITY - Ethernet interrupt priority. The is default is
the higest priority.
CONFIG_NET_WOL - Enable Wake-up on Lan (not fully implemented).
CONFIG_NET_DUMPPACKET - Dump all received and transmitted packets.
Also needs CONFIG_DEBUG.
CONFIG_NET_REGDEBUG - Enabled low level register debug. Also needs
CONFIG_DEBUG.
CONFIG_NET_HASH - Enable receipt of near-perfect match frames.
CONFIG_NET_MULTICAST - Enable receipt of multicast (and unicast) frames.
Automatically set if CONFIG_NET_IGMP is selected.
Related DEVCFG3 Configuration Settings:
CONFIG_PIC32MX_FETHIO: Ethernet I/O Pin Selection bit:
1 = Default Ethernet I/O Pins
0 = Alternate Ethernet I/O Pins
CONFIG_PIC32MX_FMIIEN: Ethernet MII Enable bit
1 = MII enabled
0 = RMII enabled
PIC32MXx USB Device Configuration
PIC32MXx USB Host Configuration (the PIC32MX does not support USB Host)
Configurations
==============
Each PIC32MX configuration is maintained in a sudirectory and can be
selected as follow:
cd tools
./configure.sh pic32-starterkit/<subdir>
cd -
. ./setenv.sh
Where <subdir> is one of the following:
ostest:
=======
Description.
------------
This configuration directory, performs a simple OS test using
apps/examples/ostest.
Serial Output.
--------------
The OS test produces all of its test output on the serial console.
This configuration has UART1 enabled as a serial console. I have
been unable to get this UART work on the MEB. But on the Expansion
I/O board, this maps to RX = J11 pin 41 and TX = J11 pin 43
nsh:
====
Description.
------------
This is the NuttShell (NSH) using the NSH startup logic at
apps/examples/nsh.
Serial Output.
--------------
The OS test produces all of its test output on the serial console.
This configuration has UART1 enabled as a serial console. I have
been unable to get this UART work on the MEB. But on the Expansion
I/O board, this maps to RX = J11 pin 41 and TX = J11 pin 43
USB Configuations.
-----------------
Several USB device configurations can be enabled and included
as NSH built-in built in functions.
To use USB device, connect the starter kit to the host using a cable
with a Type-B micro-plug to the starter kit<69>s micro-A/B port J5, located
on the bottom side of the starter kit. The other end of the cable
must have a Type-A plug. Connect it to a USB host. Jumper JP2 should be
removed.
All USB device configurations require the following basic setup in
your NuttX configuration file to enable USB device support:
CONFIG_USBDEV=y : Enable basic USB device support
CONFIG_PIC32MX_USBDEV=y : Enable PIC32 USB device support
examples/usbterm - This option can be enabled by uncommenting
the following line in the appconfig file:
CONFIGURED_APPS += examples/usbterm
And by enabling one of the USB serial devices:
CONFIG_PL2303=y : Enable the Prolifics PL2303 emulation
CONFIG_CDCACM=y : or the CDC/ACM serial driver (not both)
examples/cdcacm - The examples/cdcacm program can be included as an
function by uncommenting the following line in the appconfig file:
CONFIGURED_APPS += examples/cdcacm
and defining the following in your .config file:
CONFIG_CDCACM=y : Enable the CDCACM device
examples/usbstorage - There are some hooks in the appconfig file
to enable the USB mass storage device. However, this device cannot
work until support for the SD card is also incorporated.
Networking Configuations.
-------------------------
Several Networking configurations can be enabled and included
as NSH built-in built in functions. The following additional
configuration settings are required:
CONFIG_NET=y : Enable networking support
CONFIG_PIC32MX_ETHERNET=y : Enable the PIC32 Ethernet driver
CONFIG_NSH_TELNET=y : Enable the Telnet NSH console (optional)
NOTES:
1. This logic will assume that a network is connected. During its
initialization, it will try to negotiate the link speed. If you have
no network connected when you reset the board, there will be a long
delay (maybe 30 seconds?) before anything happens. That is the timeout
before the networking finally gives up and decides that no network is
available.
2. This example can support an FTP client. In order to build in FTP client
support simply uncomment the following lines in the appconfig file (before
configuring) or in the apps/.config file (after configuring):
#CONFIGURED_APPS += netutils/ftpc
#CONFIGURED_APPS += examples/ftpc
3. This example can support an FTP server. In order to build in FTP server
support simply uncomment the following lines in the appconfig file (before
configuring) or in the apps/.config file (after configuring):
#CONFIGURED_APPS += netutils/ftpd
#CONFIGURED_APPS += examples/ftpd
And enable poll() support in the NuttX configuration file:
CONFIG_DISABLE_POLL=n
nsh2:
=====
This is an alternative NSH configuration. Without the Expansion I/O board,
there is no way to connect a serial console. This NSH alternative supports
only a Telnet console. The nsh2 differs from the nsh configuration in the
following ways:
1. Networking is enabled:
CONFIG_NET=y : Enable networking support
CONFIG_PIC32MX_ETHERNET=y : Enable the PIC32 Ethernet driver
CONFIG_NSH_CONSOLE=n : Disable NSH serial console
CONFIG_NSH_TELNET=y : Enable the Telnet NSH console
See apps/nshlib/README.txt for other NSH networking-related configuration
settings.
2. UART1 is disabled
CONFIG_PIC32MX_UART1=n : UART1 is disabled (as well as other UARTs)
CONFIG_UART1_SERIAL_CONSOLE=n : There is no serial console
3. The RAM log is enabled"
CONFIG_SYSLOG=y : Enables the System Logging feature.
CONFIG_RAMLOG=y : Enable the RAM-based logging feature.
CONFIG_RAMLOG_CONSOLE=n : (there is no default console device)
CONFIG_RAMLOG_SYSLOG=y : This enables the RAM-based logger as the
system logger.
Logging is currently set up to use 16Kb of memory:
CONFIG_RAMLOG_CONSOLE_BUFSIZE=16384
There are a few other configuration differences as necessary to support
this different device configuration. Just the do the 'diff' if you are
curious.
NOTES:
See the notes for the nsh configuration. Most also apply to the nsh2
configuration.
Using a RAM disk and the USB MSC device with nsh and nsh2
---------------------------------------------------------
Here is an experimental change to either examples/nsh or examples/nsh2
that will create a RAM disk and attempt to export that RAM disk as a
USB mass storage device.
1. Changes to nuttx/.config
a) Enable support for the PIC32 USB device
-CONFIG_PIC32MX_USBDEV=n
+CONFIG_PIC32MX_USBDEV=y
b) Enable NuttX USB device support
-CONFIG_USBDEV=n
+CONFIG_USBDEV=y
c) Enable the USB MSC class driver
-CONFIG_USBMSC=n
+CONFIG_USBMSC=y
d) Use a RAM disk (instead of an SD card) as the USB MSC logical unit:
-CONFIG_EXAMPLES_USBMSC_DEVPATH1="/dev/mmcsd0"
+CONFIG_EXAMPLES_USBMSC_DEVPATH1="/dev/ram0"
2. Changes to nuttx/.config.
a) Enable building of the examples/usbstorage:
-# CONFIGURED_APPS += examples/usbstorage
+ CONFIGURED_APPS += examples/usbstorage
3. When NSH first comes up, you must manually create the RAM disk
before exporting it:
a) Create a 64Kb RAM disk at /dev/ram0:
nsh> mkrd -s 512 128
b) Put a FAT file system on the RAM disk:
nsh> mkfatfs /dev/ram0
b) Now the 'msconn' command will connect to the host and
export /dev/ram0 as the USB logical unit:
nsh> msconn
NOTE: This modification should be considered experimental. IN the
little testing I have done with it, it appears functional. But the
logic has not been stressed and there could still be lurking issues.
Update. The following was added to the top-level TODO list:
Title: PIC32 USB DRIVER DOES NOT WORK WITH MASS STORAGE CLASS
Description: The PIC32 USB driver either crashes or hangs when used with
the mass storage class when trying to write files to the target
storage device. This usually works with debug on, but does not
work with debug OFF (implying some race condition?)
Here are some details of what I see in debugging:
1. The USB MSC device completes processing of a read request
and returns the read request to the driver.
2. Before the MSC device can even begin the wait for the next
driver, many packets come in at interrupt level. The MSC
device goes to sleep (on pthread_cond_wait) with all of the
read buffers ready (16 in my test case).
3. The pthread_cond_wait() does not wake up. This implies
a problem with pthread_con_wait(?). But in other cases,
the MSC device does wake up, but then immediately crashes
because its stack is bad.
4. If I force the pthread_cond_wait to wake up (by using
pthread_cond_timedwait instead), then the thread wakes
up and crashes with a bad stack.
So far, I have no clue why this is failing.
Status: Open
Priority: High
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