A. Serrano*1, J.C. Vélez2, M. Calle3
1,2,3 Grupo de Investigación en Telecomunicaciones y Señales Universidad del Norte Barranquilla, Atlántico, Colombia. *antonio.r.smendoza@gmail.com.
ABSTRACT
The paper presents important design characteristics of the control scheme for an FFT-CCD sensor. The hardware module employs a microchip PIC32 core with a Hamamatsu CCD sensor, for image retrieval, conversion and transfer to a computer. The paper focuses on describing the core programming for sensor control and USB communication. The description provides useful information for researchers and hardware interface developers. The system was tested for transfer delay in USB connections with different number of endpoints and three endpoint sizes. Results show that USB connections with three endpoints and 64-byte endpoint size have the smallest transfer delay, 1 second. Connections with two endpoints increase delay in 100 milliseconds; however, this setup is simpler to implement.
Keywords: full frame transfer, CCD, USB, acquisition, control.
]]>RESUMEN
El siguiente artículo presenta las características más importantes del diseño de un sistema de control para un sensor FFT-CCD. El módulo hardware utiliza un controlador PIC32 de microchip y un sensor CCD de Hamamatsu, para capturar, convertir y transferir una imagen a un computador. El artículo se enfoca en la descripción de la programación del PIC para el control del sensor y de la conexión USB. Esta descripción provee información útil para investigadores y desarrolladores de interfaces en hardware. El sistema se sometió a pruebas de tiempo de transferencia en conexiones USB con diferentes números y tamaños de endpoints. Los resultados muestran que las conexiones USB con tres endpoints con 64 bytes de tamaño permiten obtener el menor tiempo de transferencia, 1 segundo. Cuando se utilizan dos endpoints, el tiempo de transferencia aumenta en 100 milisegundos, pero la implementación es más sencilla.
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