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Here lies some random pieces of information that may make it easier to understand the code base
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Kevin |
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KNOWN ISSUES:
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Cube is occasionally flickering to ~60Hz. Need to figure out why.
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Kevin |
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Interrupts dont seem to be preempting properly. Not sure why.
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Kevin |
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PERIPHERAL USAGE:
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8 |
SPI1 - Used by the cube code to send data to the ube
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9 |
SPI4 - Unused
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10 |
I2C1 - Used by the controller code
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Kevin |
11 |
TIMER2 - Used by PWM2
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Kevin |
12 |
TIMER4 - Used by the cube code for the overlay rotation interrupt
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TIMER5 - Used by the cube code for the update layer interrupt
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14 |
UART1 - Used by the cube code for reading in frame data
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15 |
PWM2 - Generates a constant ~20MHz output, uses TIMER2
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Kevin |
16 |
ETHERNET - Used to remote-update the cube
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Kevin |
17 |
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PERIPHERAL INTERRUPT PRIORITY LEVELS:
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IPL1 = lowest, IPL7 = highest priority
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20 |
SPI1 - Priority 5, Subpriority 1
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21 |
SPI4 - Priority 6, Subpriority 2
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22 |
I2C1 - Priority 5, Subpriority 1
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Kevin |
23 |
TIMER5 - Priority 3, Subpriority 1
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24 |
TIMER4 - Priority 1, Subpriority 1
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Kevin |
25 |
UART1 - Priority 2, Subpriority 1
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Kevin |
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ETHERNET - Priority 1, Subpriority 1
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Kevin |
27 |
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28 |
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PIN I/Os:
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30 |
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31 |
JA-01 AN2/C2IN-/CN4/RB2 RB02
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32 |
JA-02 AN3/C2IN+/CN5/RB3 RB03
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33 |
JA-03 AN4/C1IN-/CN6/RB4 RB04
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JA-04 PGEC2/AN6/OCFA/RB6 RB06
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JA-07 PGED2/AN7/RB7 RB07
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JA-08 AN8/C1OUT/RB8 RB08
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JA-09 AN9/C2OUT/RB9 RB09
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JA-10 CVrefout/PMA13/AN10/RB10 RB10
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*
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JB-01 PMD0/RE0 RE00
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JB-02 PMD1/RE1 RE01
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JB-03 PMD2/RE2 RE02
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JB-04 PMD3/RE3 RE03
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JB-07 PMD4/RE4 RE04
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JB-08 PMD5/RE5 RE05
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JB-09 PMD6/RE6 RE06
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JB-10 PMD7/RE7 RE07
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*
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JC-01 T2CK/RC1 RC01
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JC-02 C2RX/PMD8/RG0 RG00
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JC-03 C2TX/ETXERR/PMD9/RG1 RG01
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JC-04 ETXCLK/PMD15/CN16/RD7 RD07
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JC-07 AN15/ERXD3/AETXD2/OCFB/PMALL/PMA0/CN12/RB15 RB15 (SFT_D)
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JC-08 PMRD/CN14/RD5 RD05 (SFT_S)
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JC-09 OC5/PMWR/CN13/RD4 RD04 (SFT_K)
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JC-10 AN14/ERXD2/AETXD3/PMALH/PMA1/RB14 RB14 (SFT_R)
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*
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JD-01 SS1/IC2/RD9 RD09 (GSLAT)
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JD-02 SDO1/OC1/INT0/RD0 RD00 (GSSIN)
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60 |
JD-03 T5CK/SDI1/RC4 RC04 (GSSOUT)
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61 |
JD-04 SCK1/IC3/PMCS2/PMA15/RD10 RD10 (GSSCK)
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62 |
JD-07 OC2/RD1 RD01 (PWMCK)
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JD-08 OC3/RD2 RD02 (XBLNK)
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JD-09 OC4/RD3 RD03
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JD-10 ETXD2/IC5/PMD12/RD12 RD12
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*
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JE-01 AETXD0/SS3/U4RX/U1CTS/CN20/RD14 RD14
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JE-02 SCL3/SDO3/U1TX/RF8 RF08
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JE-03 SDA3/SDI3/U1RX/RF2 RF02
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JE-04 AETXD1/SCK3/U4TX/U1RTS/CN21/RD15 RD15
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JE-07 TRCLK/RA6 RA06 on 32MX7 or INT1/RF8 on MX7CK
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JE-08 TRD3/RA7 RA07
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JE-09 Vref-/CVref-/AERXD2/PMA7/RA9 RA09
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JE-10 Vref+/CVref+/AERXD3/PMA6/RA10 RA10
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*
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JF-01 AC1RX/SS4/U5RX/U2CTS/RF12 RF12 shared with CAN1 Transceiver (JP-1)
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JF-02 SCL5/SDO4/U2TX/PMA8/CN18/RF5 RF05
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JF-03 SDA5/SDI4/U2RX/PMA9/CN17/RF4 RF04
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JF-04 AC1TX/SCK4/U5TX/U2RTS/RF13 RF13 shared with CAN1 Transceiver (JP-2)
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JF-07 TMS/RA0 RA00 on 32MX7 or INT2/RF9 on MX7CK
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JF-08 TCK/RA1 RA01
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JF-09 TDI/RA4 RA04
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JF-10 TDO/RA5 RA05
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N/A SCL2/RA2 RA02 I2C bus #2, not shared with Pmod connector
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N/A SDA2/RA3 RA03 I2C bus #2, not shared with Pmod connector
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N/A AETXCLK/SCL1/INT3/RA14 RA14 I2C Bus #1, not shared with Pmod connector
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N/A AETXEN/SDA1/INT4/RA15 RA15 I2C Bus #1, not shared with Pmod connector
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N/A PGED1/AN0/CN2/RB0 RB00 Used by debug circuit, PGC
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N/A PGEC1/AN1/CN3/RB1 RB01 Used by debug circuit, PGD
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N/A AN5/C1IN+/VBUSON/CN7/RB5 RB05 USB VBUSON
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N/A AN11/ERXERR/AETXERR/PMA12/RB11 RB11 Ethernet PHY
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N/A AN12/ERXD0/AECRS/PMA11/RB12 RB12 Ethernet PHY
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N/A AN13/ERXD1/AECOL/PMA10/RB13 RB13 Ethernet PHY
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N/A OSC1/CLKI/RC12 RC12 Primary Oscillator Crystal
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N/A SOSCI/CN1/RC13 RC13 Secondary Oscillator Crystal
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N/A SOSCO/T1CK/CN0/RC14 RC14 Secondary Oscillator Crystal
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N/A OSC2/CLKO/RC15 RC15 Primary Oscillator Crystal
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N/A ETXEN/PMD14/CN15/RD6 RD06 Ethernet PHY
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N/A RTCC/EMDIO/AEMDIO/IC1/RD8 RD08 Ethernet PHY
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N/A EMDC/AEMDC/IC4/PMCS1/PMA14/RD11 RD11 Ethernet PHY
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102 |
N/A ETXD3/PMD13/CN19/RD13 RD13 BTN3
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103 |
N/A AERXD0/INT1/RE8 RE08 USB Overcurrent detect
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104 |
N/A AERXD1/INT2/RE9 RE09 Ethernet PHY Reset
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105 |
N/A C1RX/ETXD1/PMD11/RF0 RF00 Ethernet PHY
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106 |
N/A C1TX/ETXD0/PMD10/RF1 RF01 Ethernet PHY
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107 |
N/A USBID/RF3 RF03 USBID (USB-4)
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108 |
N/A D+/RG2 RG02 D+ (USB-3)
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109 |
N/A D-/RG3 RG03 D- (USB-2)
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110 |
N/A ECOL/SCK2/U6TX/U3RTS/PMA5/CN8/RG6 RG06 BTN1
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N/A ECRS/SDA4/SDI2/U3RX/PMA4/CN9/RG7 RG07 BTN2
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112 |
N/A ERXDV/AERXDV/ECRSDV/AECRSDV/SCL4/SDO2/U3TX/PMA3/CN10/RG8 RG08 Ethernet PHY
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N/A ERXCLK/AERXCLK/EREFCLK/AEREFCLK/SS2/U6RX/U3CTS/PMA2/CN11/RG9 RG09 Ethernet PHY
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N/A TRD1/RG12 RG12 LED1
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N/A TRD0/RG13 RG13 LED2
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N/A TRD2/RG14 RG14 LED3
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N/A AERXERR/RG15 RG15 LED4
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CONNECTORS:
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J1 - Serial USB Misc Connections (MX7CK only)
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* This header contains other FTDI UART function pins (CTS, DSR, DCD, RI)
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J2 - Serial USB Connector (MX7CK only)
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* This connector is connected to UART1 or PMOD JE
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126 |
J7 - I2C port daisy chain connector
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* On the Cerebot 32MX7, this connector provides access to the I2C signals, power and ground for I2C2.
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* On the Cerebot MX7CK, this connector provides access to the I2C signals, power and ground for I2C1 + INT3/4.
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129 |
J8 - I2C port daisy chain connector
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* On the Cerebot 32MX7, this connector provides access to the I2C signals, power and ground for I2C1.
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* On the Cerebot MX7CK, this connector provides access to the I2C signals, power and ground for I2C2.
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EEPROM is changed to this port on the MX7CK
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J9 - CAN #1 Connector
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* This connector is used to access the signals for CAN #1.
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J10 - CAN #2 Connector
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* This connector is used to access the signals for CAN #2.
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J11 - Ethernet Connector
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* This connector provides access to the 10/100 Ethernet port.
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J12-J14
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* Do Not Use.
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J15 - Debug USB Connector
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* This connector is used to connect the on-board programming and
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debug circuit to the PC for use with the MPLAB IDE.
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J16 - Power supply source select
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* This jumper is used to select the source of main board power.
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Place a shorting block in the upper, ?USB? position to have the
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board powered from the USB device connector, J19.
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Place a shorting block in the center, ?EXT? position to have the
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board powered from one of the external power connectors, J17 or J18.
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Place a shorting block in the lower, ?DBG? position to have the
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board powered from the debug USB connector, J15.
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J17 - External Power Connector
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* This is a 2.5mm x 5.5mm, center positive, coax power connector used to
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provide external power to the board. The optional Digilent 5V Switching
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Power Supply is connected here.
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J18 - External Power Connector
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* This is a screw terminal connector used to provide external power to
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the board. Be sure to observe proper polarity (marked near the connector)
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when providing power via this connector, or damage to the board and/or
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connected devices may result.
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J19 - USB Device / OTG Connector
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* This is a USB micro-AB connector. It is used when using the PIC32MX795
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microcontroller to implement a USB device or OTG Host/Device.
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J20 - USB Host Connector
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* This is a standard sized USB type A connector. This connector is used to
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connect USB devices to the board when using the PIC32MX795 microcontroller
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to implement an embedded USB host.
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JUMPERS:
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JP1 & JP2 - CAN or Pmod Select
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* These jumpers select microcontroller signals RF12 and RF13 for use with CAN
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#1 or Pmod connector JF. Place these jumpers in the CAN position to use CAN
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#1. Place the jumpers in the PMOD position to use then with Pmod connector JF.
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JP3 & JP4 - Pull-up enable for I2C port #2
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* These two jumpers are used to enable/disable the pull-up resistors on I2C
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port #2. Insert shorting blocks on these two jumpers to enable the pull-up
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resistors. Remove the shorting blocks to disable the pull-up resistors. Only
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a single device on the I2C bus should have the pull-up resistors enabled.
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JP5 - CAN #1 Termination
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* This jumper is used to enable/disable the 120 ohm termination resistor for
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CAN #1. Insert the shorting block to enable the termination resistor, remove
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it to disable the termination resistor.
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JP6 - CAN #1 5V0 Enable
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* This jumper is used to enable/disable providing 5V to the CAN #1 connector.
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Insert the shorting block to connect the board 5V0 supply to pins 9 & 10 of
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CAN #1 connector. Remove the shorting block to disconnect the 5V0 supply.
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JP7 - CAN #2 Termination
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* This jumper is used to enable/disable the 120 ohm termination resistor for
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CAN #2. Insert the shorting block to enable the termination resistor, remove
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it to disable the termination resistor.
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JP8 - CAN #1 5V0 Enable
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* This jumper is used to enable/disable providing 5V to the CAN #1 connector.
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Insert the shorting block to connect the board 5V0 supply to pins 9 & 10 of
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CAN #1 connector. Remove the shorting block to disconnect the 5V0 supply.
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JP9 - Do Not Use
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JP10 - USB Host Power Select
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* This jumper is used to select which host connector is powered when host power
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is enabled. Place the shorting block in the ?MICRO? position to supply power
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to the USB micro-AB OTG Connector, J19. Place the shorting block in the ?A?
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position to supply power to the USB type A Host Connector, J20.
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JP11 - Programmer Serial Select (MX7CK only)
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* Remove the jumper to disconnect the USB serial converter's connection to the
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MCLR pin. Disconnecting this when using the built in debugger is recommended.
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206 |
JP17 - Do Not Use
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