Rev 241 | Blame | Last modification | View Log | RSS feed
Here lies some random pieces of information that may make it easier to understand the code baseKNOWN ISSUES:Cube is occasionally flickering to ~60Hz. Need to figure out why.Interrupts dont seem to be preempting properly. Not sure why.PERIPHERAL USAGE:SPI1 - Used by the cube code to send data to the ubeSPI4 - UnusedI2C1 - Used by the controller codeTIMER2 - Used by PWM2TIMER4 - Used by the cube code for the overlay rotation interruptTIMER5 - Used by the cube code for the update layer interruptUART1 - Used by the cube code for reading in frame dataPWM2 - Generates a constant ~20MHz output, uses TIMER2ETHERNET - Used to remote-update the cubePERIPHERAL INTERRUPT PRIORITY LEVELS:IPL1 = lowest, IPL7 = highest prioritySPI1 - Priority 5, Subpriority 1SPI4 - Priority 6, Subpriority 2I2C1 - Priority 5, Subpriority 1TIMER5 - Priority 3, Subpriority 1TIMER4 - Priority 1, Subpriority 1UART1 - Priority 2, Subpriority 1ETHERNET - Priority 2, Subpriority 2PIN I/Os:JA-01 AN2/C2IN-/CN4/RB2 RB02JA-02 AN3/C2IN+/CN5/RB3 RB03JA-03 AN4/C1IN-/CN6/RB4 RB04JA-04 PGEC2/AN6/OCFA/RB6 RB06JA-07 PGED2/AN7/RB7 RB07JA-08 AN8/C1OUT/RB8 RB08JA-09 AN9/C2OUT/RB9 RB09JA-10 CVrefout/PMA13/AN10/RB10 RB10*JB-01 PMD0/RE0 RE00JB-02 PMD1/RE1 RE01JB-03 PMD2/RE2 RE02JB-04 PMD3/RE3 RE03JB-07 PMD4/RE4 RE04JB-08 PMD5/RE5 RE05JB-09 PMD6/RE6 RE06JB-10 PMD7/RE7 RE07*JC-01 T2CK/RC1 RC01JC-02 C2RX/PMD8/RG0 RG00JC-03 C2TX/ETXERR/PMD9/RG1 RG01JC-04 ETXCLK/PMD15/CN16/RD7 RD07JC-07 AN15/ERXD3/AETXD2/OCFB/PMALL/PMA0/CN12/RB15 RB15 (SFT_D)JC-08 PMRD/CN14/RD5 RD05 (SFT_S)JC-09 OC5/PMWR/CN13/RD4 RD04 (SFT_K)JC-10 AN14/ERXD2/AETXD3/PMALH/PMA1/RB14 RB14 (SFT_R)*JD-01 SS1/IC2/RD9 RD09 (GSLAT)JD-02 SDO1/OC1/INT0/RD0 RD00 (GSSIN)JD-03 T5CK/SDI1/RC4 RC04 (GSSOUT)JD-04 SCK1/IC3/PMCS2/PMA15/RD10 RD10 (GSSCK)JD-07 OC2/RD1 RD01 (PWMCK)JD-08 OC3/RD2 RD02 (XBLNK)JD-09 OC4/RD3 RD03JD-10 ETXD2/IC5/PMD12/RD12 RD12*JE-01 AETXD0/SS3/U4RX/U1CTS/CN20/RD14 RD14JE-02 SCL3/SDO3/U1TX/RF8 RF08JE-03 SDA3/SDI3/U1RX/RF2 RF02JE-04 AETXD1/SCK3/U4TX/U1RTS/CN21/RD15 RD15JE-07 TRCLK/RA6 RA06 on 32MX7 or INT1/RF8 on MX7CKJE-08 TRD3/RA7 RA07JE-09 Vref-/CVref-/AERXD2/PMA7/RA9 RA09JE-10 Vref+/CVref+/AERXD3/PMA6/RA10 RA10*JF-01 AC1RX/SS4/U5RX/U2CTS/RF12 RF12 shared with CAN1 Transceiver (JP-1)JF-02 SCL5/SDO4/U2TX/PMA8/CN18/RF5 RF05JF-03 SDA5/SDI4/U2RX/PMA9/CN17/RF4 RF04JF-04 AC1TX/SCK4/U5TX/U2RTS/RF13 RF13 shared with CAN1 Transceiver (JP-2)JF-07 TMS/RA0 RA00 on 32MX7 or INT2/RF9 on MX7CKJF-08 TCK/RA1 RA01JF-09 TDI/RA4 RA04JF-10 TDO/RA5 RA05N/A SCL2/RA2 RA02 I2C bus #2, not shared with Pmod connectorN/A SDA2/RA3 RA03 I2C bus #2, not shared with Pmod connectorN/A AETXCLK/SCL1/INT3/RA14 RA14 I2C Bus #1, not shared with Pmod connectorN/A AETXEN/SDA1/INT4/RA15 RA15 I2C Bus #1, not shared with Pmod connectorN/A PGED1/AN0/CN2/RB0 RB00 Used by debug circuit, PGCN/A PGEC1/AN1/CN3/RB1 RB01 Used by debug circuit, PGDN/A AN5/C1IN+/VBUSON/CN7/RB5 RB05 USB VBUSONN/A AN11/ERXERR/AETXERR/PMA12/RB11 RB11 Ethernet PHYN/A AN12/ERXD0/AECRS/PMA11/RB12 RB12 Ethernet PHYN/A AN13/ERXD1/AECOL/PMA10/RB13 RB13 Ethernet PHYN/A OSC1/CLKI/RC12 RC12 Primary Oscillator CrystalN/A SOSCI/CN1/RC13 RC13 Secondary Oscillator CrystalN/A SOSCO/T1CK/CN0/RC14 RC14 Secondary Oscillator CrystalN/A OSC2/CLKO/RC15 RC15 Primary Oscillator CrystalN/A ETXEN/PMD14/CN15/RD6 RD06 Ethernet PHYN/A RTCC/EMDIO/AEMDIO/IC1/RD8 RD08 Ethernet PHYN/A EMDC/AEMDC/IC4/PMCS1/PMA14/RD11 RD11 Ethernet PHYN/A ETXD3/PMD13/CN19/RD13 RD13 BTN3N/A AERXD0/INT1/RE8 RE08 USB Overcurrent detectN/A AERXD1/INT2/RE9 RE09 Ethernet PHY ResetN/A C1RX/ETXD1/PMD11/RF0 RF00 Ethernet PHYN/A C1TX/ETXD0/PMD10/RF1 RF01 Ethernet PHYN/A USBID/RF3 RF03 USBID (USB-4)N/A D+/RG2 RG02 D+ (USB-3)N/A D-/RG3 RG03 D- (USB-2)N/A ECOL/SCK2/U6TX/U3RTS/PMA5/CN8/RG6 RG06 BTN1N/A ECRS/SDA4/SDI2/U3RX/PMA4/CN9/RG7 RG07 BTN2N/A ERXDV/AERXDV/ECRSDV/AECRSDV/SCL4/SDO2/U3TX/PMA3/CN10/RG8 RG08 Ethernet PHYN/A ERXCLK/AERXCLK/EREFCLK/AEREFCLK/SS2/U6RX/U3CTS/PMA2/CN11/RG9 RG09 Ethernet PHYN/A TRD1/RG12 RG12 LED1N/A TRD0/RG13 RG13 LED2N/A TRD2/RG14 RG14 LED3N/A AERXERR/RG15 RG15 LED4CONNECTORS:J1 - Serial USB Misc Connections (MX7CK only)* This header contains other FTDI UART function pins (CTS, DSR, DCD, RI)J2 - Serial USB Connector (MX7CK only)* This connector is connected to UART1 or PMOD JEJ7 - I2C port daisy chain connector* On the Cerebot 32MX7, this connector provides access to the I2C signals, power and ground for I2C2.* On the Cerebot MX7CK, this connector provides access to the I2C signals, power and ground for I2C1 + INT3/4.J8 - I2C port daisy chain connector* On the Cerebot 32MX7, this connector provides access to the I2C signals, power and ground for I2C1.* On the Cerebot MX7CK, this connector provides access to the I2C signals, power and ground for I2C2.EEPROM is changed to this port on the MX7CKJ9 - CAN #1 Connector* This connector is used to access the signals for CAN #1.J10 - CAN #2 Connector* This connector is used to access the signals for CAN #2.J11 - Ethernet Connector* This connector provides access to the 10/100 Ethernet port.J12-J14* Do Not Use.J15 - Debug USB Connector* This connector is used to connect the on-board programming anddebug circuit to the PC for use with the MPLAB IDE.J16 - Power supply source select* This jumper is used to select the source of main board power.Place a shorting block in the upper, ?USB? position to have theboard powered from the USB device connector, J19.Place a shorting block in the center, ?EXT? position to have theboard powered from one of the external power connectors, J17 or J18.Place a shorting block in the lower, ?DBG? position to have theboard powered from the debug USB connector, J15.J17 - External Power Connector* This is a 2.5mm x 5.5mm, center positive, coax power connector used toprovide external power to the board. The optional Digilent 5V SwitchingPower Supply is connected here.J18 - External Power Connector* This is a screw terminal connector used to provide external power tothe board. Be sure to observe proper polarity (marked near the connector)when providing power via this connector, or damage to the board and/orconnected devices may result.J19 - USB Device / OTG Connector* This is a USB micro-AB connector. It is used when using the PIC32MX795microcontroller to implement a USB device or OTG Host/Device.J20 - USB Host Connector* This is a standard sized USB type A connector. This connector is used toconnect USB devices to the board when using the PIC32MX795 microcontrollerto implement an embedded USB host.JUMPERS:JP1 & JP2 - CAN or Pmod Select* These jumpers select microcontroller signals RF12 and RF13 for use with CAN#1 or Pmod connector JF. Place these jumpers in the CAN position to use CAN#1. Place the jumpers in the PMOD position to use then with Pmod connector JF.JP3 & JP4 - Pull-up enable for I2C port #2* These two jumpers are used to enable/disable the pull-up resistors on I2Cport #2. Insert shorting blocks on these two jumpers to enable the pull-upresistors. Remove the shorting blocks to disable the pull-up resistors. Onlya single device on the I2C bus should have the pull-up resistors enabled.JP5 - CAN #1 Termination* This jumper is used to enable/disable the 120 ohm termination resistor forCAN #1. Insert the shorting block to enable the termination resistor, removeit to disable the termination resistor.JP6 - CAN #1 5V0 Enable* This jumper is used to enable/disable providing 5V to the CAN #1 connector.Insert the shorting block to connect the board 5V0 supply to pins 9 & 10 ofCAN #1 connector. Remove the shorting block to disconnect the 5V0 supply.JP7 - CAN #2 Termination* This jumper is used to enable/disable the 120 ohm termination resistor forCAN #2. Insert the shorting block to enable the termination resistor, removeit to disable the termination resistor.JP8 - CAN #1 5V0 Enable* This jumper is used to enable/disable providing 5V to the CAN #1 connector.Insert the shorting block to connect the board 5V0 supply to pins 9 & 10 ofCAN #1 connector. Remove the shorting block to disconnect the 5V0 supply.JP9 - Do Not UseJP10 - USB Host Power Select* This jumper is used to select which host connector is powered when host poweris enabled. Place the shorting block in the ?MICRO? position to supply powerto the USB micro-AB OTG Connector, J19. Place the shorting block in the ?A?position to supply power to the USB type A Host Connector, J20.JP11 - Programmer Serial Select (MX7CK only)* Remove the jumper to disconnect the USB serial converter's connection to theMCLR pin. Disconnecting this when using the built in debugger is recommended.JP17 - Do Not Use