Difference between revisions of "PIC32MX: I2C DAC"
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== Code == |
== Code == |
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Our code is separated into sections, each with sufficient comments to explain all functions |
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Our code: |
Our code: |
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Revision as of 21:58, 15 February 2010
Original Assignment
Do not erase this section!
Your assignment is to interface to the MAX518 I2C digital to analog converter (DAC).
Overview
Note: PROJECT NOT FULLY FUNCTIONAL!
On this page we will present code and a wiring schematic that allows for the PIC32MX to speak to an 8-bit Digital to Analog Converter. In particular, our project used the ____ DAC.
While we were able to send data to the DAC, we were NOT able to elicit output from said DAC.
Circuit
Include a schematic and give any part numbers. A photo of your circuit is OK, but not as a replacement for a schematic.
Code
Our code is separated into sections, each with sufficient comments to explain all functions Our code:
#include <HardwareProfile.h> #include <HardwareProfile_NU32.h> #include <plib.h> // Configuration Bit settings // SYSCLK = 80 MHz (8MHz Crystal/ FPLLIDIV * FPLLMUL / FPLLODIV) // PBCLK = 50 KHz // Primary Osc w/PLL (XT+,HS+,EC+PLL) // WDT OFF // Other options are don't care // #pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FPLLODIV = DIV_1, FWDTEN = OFF #pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_2 // DEFINES #define SYSCLK (80000000) // set system clock to 80MHz #define PBCLK (SYSCLK/1000) // set PBCLK to 80 KHz #define Fsck 50000 #define BRG_VAL ((PBCLK/2/Fsck)-2) #define Nop() asm( "nop" ) //allows for a pause command // a simple puase command void i2c_wait(unsigned int cnt) { while(--cnt) { Nop(); Nop(); } } ///////////////////////////////////////////// ///////////////////////////////////////////// int main(void) { ODCA = 0xC000; unsigned char SlaveAddress; char i2cData[3]; //Enable channel using default values OpenI2C1( I2C_EN, BRG_VAL ); SlaveAddress = 0x58; i2cData[0] = ((SlaveAddress )); i2cData[1] = 0x05; //command line i2cData[2] = 0xFF; //end command while(1) // run the code over and over again { StartI2C1(); //Send the Start Bit (begin of data send) IdleI2C1(); //Wait to complete MasterWriteI2C1 (i2cData[0]); //address IdleI2C1(); AckI2C1(); //ask for acknowledge bit before continuing MasterWriteI2C1 (i2cData[1]); //command line IdleI2C1(); AckI2C1(); MasterWriteI2C1(i2cData[2]); //output IdleI2C1(); AckI2C1(); StopI2C1(); //end of data send } }