Difference between revisions of "PIC32MX: I2C DAC"
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== Code == |
== Code == |
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Where possible, make it a single piece of well-commented cut-and-pastable code, or at least make each function that way, so others can easily copy it. Most comments should be in the code itself; outside the code (on the wiki) should only be explanatory comments that are too cumbersome to include in the code. |
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== #include <HardwareProfile.h> |
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#include <HardwareProfile_NU32.h> |
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#include <plib.h> |
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// Configuration Bit settings |
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// SYSCLK = 80 MHz (8MHz Crystal/ FPLLIDIV * FPLLMUL / FPLLODIV) |
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// PBCLK = 50 KHz |
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// Primary Osc w/PLL (XT+,HS+,EC+PLL) |
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// WDT OFF |
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// Other options are don't care |
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// |
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#pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FPLLODIV = DIV_1, FWDTEN = OFF |
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#pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_2 |
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// DEFINES |
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#define SYSCLK (80000000) // set system clock to 80MHz |
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#define PBCLK (SYSCLK/1000) // set PBCLK to 80 KHz |
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#define Fsck 50000 |
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#define BRG_VAL ((PBCLK/2/Fsck)-2) |
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#define Nop() asm( "nop" ) //allows for a pause command |
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// a simple puase command |
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void i2c_wait(unsigned int cnt) |
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{ |
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while(--cnt) |
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{ |
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Nop(); |
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Nop(); |
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} |
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} |
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///////////////////////////////////////////// |
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///////////////////////////////////////////// |
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int main(void) |
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{ |
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ODCA = 0xC000; |
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unsigned char SlaveAddress; |
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char i2cData[3]; |
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//Enable channel using default values |
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OpenI2C1( I2C_EN, BRG_VAL ); |
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SlaveAddress = 0x58; |
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i2cData[0] = ((SlaveAddress )); |
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i2cData[1] = 0x05; //command line |
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i2cData[2] = 0xFF; //end command |
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while(1) // run the code over and over again |
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{ |
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StartI2C1(); //Send the Start Bit (begin of data send) |
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IdleI2C1(); //Wait to complete |
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MasterWriteI2C1 (i2cData[0]); //address |
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IdleI2C1(); |
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AckI2C1(); //ask for acknowledge bit before continuing |
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MasterWriteI2C1 (i2cData[1]); //command line |
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IdleI2C1(); |
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AckI2C1(); |
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MasterWriteI2C1(i2cData[2]); //output |
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IdleI2C1(); |
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AckI2C1(); |
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StopI2C1(); //end of data send |
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} |
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} |
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== |
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Revision as of 21:36, 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
== #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
} }
==
