PIC32MX

PIC32MX150F128B

PIC32MX1XX/2XX Datasheet
- The maximum current sinked or sourced per GPIO pin is 15 mA as shown on page 257 of the Datasheet. This is significantly less that the 25 mA for the PIC18F family devices.
worked through examples guide {from www.eevblog.com/forum…}
- comments on guide examples — comments are specifically on a modified example 3.0 which makes use of UART2
Paged through PIC32 Flash Programming Specification
- I was wondering if there are differences between pic32 ICSP and older devices.
- discovered pic32 core runs at different voltage than peripherals. These devices have internal regulator for core. V_CAP is required for the internal regulator.
PPS - how-do-i-find-group-number-for-peripheral

Power Requirements

· V_dd which is the typical power supply for CMOS ICs.

· V_ss is ground.

· AV_dd is the supply for the analog circuits (ADC)

· V_CAP is for the internal voltage regulator. The core of the chip actually runs at a lower voltage than the IO and the chip has a built in regulator for the core. Vdd is 3.3 volts but the internal voltage is 1.8 volts. This allows for lower power at higher switching frequencies.

More on the internal regulator is given in the the document http://ww1.microchip.com/downloads/en/DeviceDoc/60001168J.pdf

See

section 27.3 for more on internal regulator.
section 2.1 for suggested connections for getting started.

eevblog reference listed above gives suggested circuit for getting started.

XC32 compiler

download compiler site
MPLAB XC32 C/C++ Compiler User’s Guide
- Can use printf() to write to USART, SPI … see 32-bit Language Tool Libraries manual (DS51685).
- printf output defaults to UART2 and can be redirected.
- also see link
- Example of printf - I have not tested this example yet

32-Bit Language Tools Libraries
PIC32 Peripheral Libraries for MPLAB C32 Compiler 2007
Section 21. UART

STARTER KIT FOR MICROSTICK II

Acts as programmer, debugger, and power source for the 28 pin PIC.
Adds minimal circuit including required capacitors, a reset circuit for /MCLR and breadboard access to all pins except /MCLR and V_DD.
- There is a V_DD test point that a header pin can be soldered into. The power supply circuit will be discussed in a subsection below.
- STARTER KIT FOR MICROSTICK II

Microstick II Power Supply

Power for the Microstick II is normally supplied from a computer USB port.

The documentation for the Microstick II actually says nothing about the limitations of the 3.3 volt regulator on the Microstick circuit board.
- For example the maximum allowable current is not specified. V_DD powers up the programmer and the target PIC but the PIC V_DD pins are not connected to the pins leading to the breadboard.
The Microstick II contains a programmer/debugger on board (PKOB). The schematic on Microstick II document just refers the the programmer circuit with a dotted outline. There is a forum entry at http://www.microchip.com/forums/m638531.aspx which makes reference to the programmer on a different board (the implication is the programmer part is the same).
- See page four of http://ww1.microchip.com/downloads/en/DeviceDoc/DS-52012A.pdf

http://ww1.microchip.com/downloads/en/DeviceDoc/21999b.pdf

http://www.microchip.com/wwwproducts/en/MCP1727

https://www.fairchildsemi.com/products/power-management/advanced-load-switches/advanced-current-limited-load-switches/FPF2102.html

http://ww1.microchip.com/downloads/en/DeviceDoc/DS-52012A.pdf

http://www.microchip.com/forums/m638531.aspx

MICROCONTROLLER LECTURES BY BRUCE LAND

See http://hackaday.com/2015/12/21/microcontroller-lectures-by-bruce-land/

Possible References

http://hades.mech.northwestern.edu/images/f/f4/Ch06.pdf
- Beginner’s Guide to Programming the PIC32
- [RTCC] ( http://trinirobotics.com/?p=855 )

Beginner’s Guide to Programming the PIC32 comments

Obtained the book June 10, 2016.

chapter 2

Exercise 1 With Library - Used project with a few changes
- changed devise to PIC32MX150F128B from PIC32MX250F128B
- commented out #pragma config UPLLEN = OFF from system.h as this device does not have a
  - USB module.
- I used board LED on A0 rather than adding one as per the exercise.

main()  {         ANSELA =0; //make sure analog is cleared     ANSELB = 0;     mPORTAClearBits(BIT_0);                  //Clear bits to ensure light is off.     mPORTASetPinsDigitalOut(BIT_0);  //Set port as output     while (1)     {         delay();         PORTToggleBits(IOPORT_A,BIT_0);     } }

chapter 9

Exercise 1 Using USB instead of RS232
- I used the example code which works at the set 2400 bps. I tried changing the data rate to 115200 bps and got garbage. I’d suggest the functions this author set up for initializing the UART are not as general as one might want. The peripheral library has more general functions that allow the UART to operate at higher bit rates. The example I attached to this page HELLO-32MX.C does work at 115200 and uses the peripheral library functions for setting up the PIC. It also sets the PIC to run at 40 MHz (unlike the book example).
- As before I used the example but changed the part to PIC32MX150F128B from the PIC32MX250F128B.
- Also, commented out reference to the USB clock in system.h
- Found HELLO-32MX.C was resetting after 17.5 minutes. Decided to include line to turn off watchdog timer. This solved the reset problem.

Simplified example using only fprint() to send data to uart2. Created variables to count passage of minutes and seconds.

#pragma config   FWDTEN = OFF    // Watchdog Timer Enable (WDT Disabled (SWDTEN Bit Controls))

printf("* %4im %2is\r\n", minutes, seconds);

Using UART plib.h functions to set up UART

   UARTConfigure(UART2, UART_ENABLE_PINS_TX_RX_ONLY);     UARTSetLineControl(UART2, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);     UARTSetDataRate(UART2, GetPeripheralClock(), BaudRate);     UARTEnable(UART2, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX | UART_TX));

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