Hardware IO Buffer

Defines

SIGNAL_MAX_AMPLITUDE

the maximal signal amplitude of the EEG slave

SIGNAL_RESOLUTION

the signal resolution of the EEG slave

SAMPLING_RATE

the sampling rate of the EEG slave

Functions

int32_t read32BitFromBuffer(unsigned char *bufferIN)

reads a 32bit float from the buffer received from the hardware

Parameters

  • bufferIN – the buffer to read from

Returns

data the variable to fill with data from the buffer

void write32BitToBuffer(unsigned char *bufferOUT, unsigned int data)

submits a 32bit float to the buffer to be sent to the hardware

Parameters

  • bufferOUT – the buffer to write into

  • data – the data to write into the buffer

void read_eegchannels_from_buffer(int32_t *eeg_sample, unsigned char *bufferIN)

read all eeg channels from the buffer received from the hardware

Parameters

  • bufferIN – the buffer used for reading

  • eeg_sample – will be written to: the array storing the values of the current EEG samples

void get_trigger_states(int32_t *trigger_states, unsigned char *bufferIN)

read the current state of all triggers from the buffer received from the hardware

Parameters

  • trigger_states – the array to fill with the current states

  • bufferIN – the buffer used for reading*

int start_buffering()

start the IPC creates a client to an IPC process which will be used with exchange_buffers to exchange the inward and outward bound buffers

Returns

client the IPC client managing the IObuffers

int exchange_buffers(int client, unsigned char *bufferIN, unsigned char *bufferOUT)

exchange the buffers

Parameters

  • client – the IPC client managing the IObuffers

  • bufferIN – the buffer received from the hardware, used for reading

  • bufferOUT – the buffer sent to the hardware used for writing

Variables

const int channeladdress[EEG_CHANNEL_COUNT]

the memory address for the eeg channels in the iobuffer

EEG_CHANNEL_COUNT and actual addresses are defined in ecat_config.h