ADS_BP
Functions | Variables
ADS1299.c File Reference
#include "ADS1299.h"
Include dependency graph for ADS1299.c:

Functions

unsigned char ADS1299ReadReg (unsigned char addr)
 Routine to read a value from a ADS1299 register passing its address. More...
 
void ADS1299WriteReg (unsigned char addr, unsigned char value)
 Routine to write a value into a ADS1299 register passing its address and the value. More...
 
int Interpret24bitAsInt32 (unsigned char *byteArray)
 This function translates 24 bits information (3 bytes) from complement of 2 format into an integer value. More...
 
void ADS1299Init (void)
 This function executes the ADS1299 power-on procedure and initializes all needed config registers. More...
 
void ADS1299ReadAllReg (unsigned char *registers)
 Routine to read all values from ADS1299 registers. It receives a pointer to a 25 bytes chars array. More...
 
void ADS1299ReadContinuousMode (void)
 Routine to start the continuous acquisition mode. More...
 
void ADS1299StopContinuousMode (void)
 Routine to stop the continuous acquisition mode. More...
 
void ADS1299SetInputModeSetGain (unsigned char mode, unsigned char gain)
 This function writes the ADS1299 channel config registers in way to set the output mode of the multiplexer and the gain. More...
 
void ADS1299SetDataRate (unsigned char mode)
 This function writes the ADS1299 CONFIG1 register in way to set the output data rate. More...
 
void ADS1299AcquireSample (unsigned char nCh, int *chValues)
 This function reads the 27 bytes coming from ADS1299, processes them converting from complement-of-two form into integer value. More...
 
unsigned char ADS1299TestSignal (unsigned char enable)
 This function enables or disables the generation of a test signal built in the ADS1299. It also modifies the input multiplexer configuration shorting the input channels to the test signal. More...
 

Variables

volatile unsigned char adsGain = 1
 
unsigned int clockFreq
 

Detailed Description

Source file for the ADS1299 device.

 ----------------— Function Description ---------------—
This c file includes all functions relative to the
ADS1299 Analog Front-End.
 ----------------------— Updates ----------------------—
 2015-05-29     /   Enzo Mastinu        / Creation

Function Documentation

§ ADS1299AcquireSample()

void ADS1299AcquireSample ( unsigned char  nCh,
int *  chValues 
)

This function reads the 27 bytes coming from ADS1299, processes them converting from complement-of-two form into integer value.

Parameters
[in]nChspecifies the number of channels
[out]*chValuespoints to the array where store the values
Returns
none.

Measured Execution Time @80MHz: 14/07/2016 -> 22 us

§ ADS1299Init()

void ADS1299Init ( void  )

This function executes the ADS1299 power-on procedure and initializes all needed config registers.

Parameters
[in]none
Returns
none.

Measured Execution Time @80MHz: 13/07/2016 -> 1.22 s

§ ADS1299ReadAllReg()

void ADS1299ReadAllReg ( unsigned char *  registers)

Routine to read all values from ADS1299 registers. It receives a pointer to a 25 bytes chars array.

Parameters
[out]registerspoints to an array where store the values
Returns
none.
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§ ADS1299ReadContinuousMode()

void ADS1299ReadContinuousMode ( void  )

Routine to start the continuous acquisition mode.

Parameters
[in]none
Returns
none.

Measured Execution Time @80MHz: 13/07/2016 -> 145 us

§ ADS1299ReadReg()

unsigned char ADS1299ReadReg ( unsigned char  addr)

Routine to read a value from a ADS1299 register passing its address.

Parameters
[in]addris the address of the register
Returns
the value of the register.
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§ ADS1299SetDataRate()

void ADS1299SetDataRate ( unsigned char  mode)

This function writes the ADS1299 CONFIG1 register in way to set the output data rate.

Parameters
[in]modespecifies the output data rate mode
Returns
none.

There are in total 7 possible values for the mode parameter:

  • 0000 0110, DR = f / 4096 –> 250 SPS (BW = 65Hz)
  • 0000 0101, DR = f / 2048 –> 500 SPS (BW = 131Hz)
  • 0000 0100, DR = f / 1024 –> 1000 SPS (BW = 262Hz)
  • 0000 0011, DR = f / 512 –> 2000 SPS (BW = 524Hz)
  • 0000 0010, DR = f / 256 –> 4000 SPS (BW = 1048Hz)
  • 0000 0001, DR = f / 128 –> 8000 SPS (BW = 2096Hz)
  • 0000 0000, DR = f / 64 –> 16000 SPS (BW = 4193Hz)
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§ ADS1299SetInputModeSetGain()

void ADS1299SetInputModeSetGain ( unsigned char  mode,
unsigned char  gain 
)

This function writes the ADS1299 channel config registers in way to set the output mode of the multiplexer and the gain.

Parameters
[in]modeis the output mode
[in]gainis the gain
Returns
none.

Each acquisition channel can be independently configured with its gain and input mode. There are in total 7 possible configuration for the gain parameter:

  • 1 –> x1
  • 2 –> x2
  • 3 –> x4
  • 4 –> x6
  • 5 –> x8
  • 6 –> x12
  • 7 –> x24

There are in total 8 possible configuration for the mode parameter:

  • 0 –> 0000 0000 Normal electrode input
  • 1 –> 0000 0000 Normal electrode input
  • 2 –> 0000 0010 Used in conjunction with BIAS_MEAS bit for BIAS measurements
  • 3 –> 0000 0011, MVDD for supply measurement
  • 4 –> 0000 0100, Temperature sensor
  • 5 –> 0000 0101, Test signal
  • 6 –> 0000 0110, BIAS_DRP (positive electrode is the driver)
  • 7 –> 0000 0111, BIAS_DRN (negative electrode is the driver)
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§ ADS1299StopContinuousMode()

void ADS1299StopContinuousMode ( void  )

Routine to stop the continuous acquisition mode.

Parameters
[in]none
Returns
none.

§ ADS1299TestSignal()

unsigned char ADS1299TestSignal ( unsigned char  enable)

This function enables or disables the generation of a test signal built in the ADS1299. It also modifies the input multiplexer configuration shorting the input channels to the test signal.

Parameters
[in]enablecan be either 0 (disable) or 1 (enable)
Returns
echo of the enable parameter.
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§ ADS1299WriteReg()

void ADS1299WriteReg ( unsigned char  addr,
unsigned char  value 
)

Routine to write a value into a ADS1299 register passing its address and the value.

Parameters
[in]addris the address of the register
[in]valueis the value to write
Returns
none.
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§ Interpret24bitAsInt32()

int Interpret24bitAsInt32 ( unsigned char *  byteArray)

This function translates 24 bits information (3 bytes) from complement of 2 format into an integer value.

Parameters
[in]*byteArraypoints to the array where store the values
Returns
result of the conversion.

Measured Execution Time @80MHz: 13/07/2016 -> 0.2 us

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