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dsPIC33F getting data from ADIS16209

 
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pietaL



Joined: 27 Jan 2010
Posts: 2

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dsPIC33F getting data from ADIS16209
PostPosted: Wed Jan 27, 2010 1:01 pm     Reply with quote
Hello,

I am new to programming and I am trying to obtain the inclination data from ADIS16209 from analog device. Here is the code:

Code:


int HiByte;

void readADIS()
{
   _SPI1IP = 4;
   _SPI1IE = 1;
   _SPI1IF = 0;

   SPI1CON1bits.MSTEN = 1;
   SPI1CON1bits.MODE16 = 1;
   SPI1CON1bits.PPRE = 0;
   SPI1CON1bits.SPRE = 2;
   SPI1CON1bits.CKE = 1;
   SPI1CON1bits.CKP = 1;
   SPI1STATbits.SPIEN = 1;

   _LATB10 = 0;         // Set RB10 as CS pin         
   SPI1BUF = 0x0C;         // Accelerometer's register address
   _LATB10 = 1;
   
   _LATB10 = 0;
   HiByte = SPI1BUF;
   _LATB10 = 1;

   HiByte = (HiByte & 0b0011111111111111);       //Strip off the ND and EA flags   
}


I use the CRO and find that there is signal output from the CS pin and a clock pulse is also generated. However, there is still no response from the accelerometer and no signal can be received. Can anyone help?

here is the information of the Accelerometer:

http://www.analog.com/static/imported-files/data_sheets/ADIS16209.pdf
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jan 27, 2010 1:17 pm     Reply with quote
This code is for the Microchip C30 compiler. This forum is for CCS
compilers. You should ask your question in one of the Microchip forums:
http://www.microchip.com/forums/
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Wed Jan 27, 2010 2:12 pm     Reply with quote
There are several errors in your code, these two are likely to cause transmission failure:
- Wrong SPI mode
- Writing command bytes to SPIBUF in 16-Bit mode doesn't send them in the first byte as required by the chip.
pietaL



Joined: 27 Jan 2010
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PostPosted: Wed Jan 27, 2010 10:19 pm     Reply with quote
Is the 33f supposed to be set to master mode? I have looked through the reference manual and the code for setting up is as follows:

Code:
/* The following code shows the SPI register configuration for Master mode */
IFS0bits.SPI1IF = 0; // Clear the Interrupt Flag
IEC0bits.SPI1IE = 0; // Disable the Interrupt
// SPI1CON1 Register Settings
SPI1CON1bits.DISSCK = 0; // Internal Serial Clock is Enabled
SPI1CON1bits.DISSDO = 0; // SDOx pin is controlled by the module
SPI1CON1bits.MODE16 = 1; // Communication is word-wide (16 bits)
SPI1CON1bits.SMP = 0; // Input data is sampled at the middle of data
// output time
SPI1CON1bits.CKE = 0; // Serial output data changes on transition
// from Idle clock state to active clock state
SPI1CON1bits.CKP = 0; // Idle state for clock is a low level;
// active state is a high level
SPI1CON1bits.MSTEN = 1; // Master mode Enabled
SPI1STATbits.SPIEN = 1; // Enable SPI module
SPI1BUF = 0x0000; // Write data to be transmitted
// Interrupt Controller Settings
IFS0bits.SPI1IF = 0; // Clear the Interrupt Flag
IEC0bits.SPI1IE = 1; // Enable the Interrupt


also, is it mean that i have to changed the register addrss to 0x0c00 but let the receive part ( HiByte = SPI1BUF ) remain unchanged?
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