TDC-GPX2 datasheet(60/77 Pages) AMSCO

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[v1-03] 2017-Dec-18

TDC-GPX2 − Application Information

// -----------------------------------------------------------------------------------------

// *** Writing the configuration registers ***

// -----------------------------------------------------------------------------------------

GPIO_SSN = 1;

// Reset the SPI interface and select the slave device

GPIO_SSN = 0;

config_error = false;

send_byte_to_SPI( spiopc_write_config + 00 ); // Opcode for "Write Configuration"

// and config address (00) are sent over SPI

for ( i = 0; i < 17; i++)

// Send all 17 config registers via SPI

send_byte_to_SPI( config_register[i] );

// -----------------------------------------------------------------------------------------

// *** Verification of config registers ***

// -----------------------------------------------------------------------------------------

GPIO_SSN = 1;

// Reset the SPI interface and select the slave device

GPIO_SSN = 0;

send_byte_to_SPI( spiopc_read_config + 00 );

// Opcode for "Read Configuration"

// and config address (00) are sent over SPI

for ( i = 0; i < 17; i++)

{

read_byte_from_SPI( Buffer );

// read one byte from SPI to Buffer variable

if ( config_register[i] != Buffer ) config_error = true;

// if there was a failure in writing the config

// registers, then the config_error flag is raised.

}

// -----------------------------------------------------------------------------------------

// *** Initialize and start the measurement ***

// -----------------------------------------------------------------------------------------

if (config_error == false )

{

GPIO_SSN = 1;

// Reset the SPI interface and select the slave device

GPIO_SSN = 0;

send_byte_to_SPI( spiopc_init );

// Opcode for "Initialize" is sent over SPI

// This is required to start measuring process

// *************************************************************************************

// End of the configuration settings. After now the time measurement will start.

// This code is designed to use SPI to read the measurement data from GPX2.

// Using LVDS as a output interface requires additional hardware and code.

// *************************************************************************************

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