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mikoPascal PRO for dsPIC30/33 and PIC24

MikroElektronika

Software SPI Library

The mikroPascal PRO for dsPIC30/33 and PIC24 provides routines for implementing Software SPI communication.

These routines are hardware independent and can be used with any MCU. The Software SPI Library provides easy

communication with other devices via SPI: A/D converters, D/A converters, MAX7219, LTC1290, etc.

Library conguration:

- SPI to Master mode

- Clock value = 20 kHz.

- Data sampled at the middle of interval.

- Clock idle state low.

- Data sampled at the middle of interval.

- Data transmitted at low to high edge.

The library congures SPI to the master mode, clock = 20kHz, data sampled at the middle of interval, clock idle state

low and data transmitted at low to high edge.

Important : The Software SPI library implements time-based activities, so interrupts need to be disabled when using it.

The following variables must be dened in all

projects using Software SPI Library:

Description: Example:

var SoftSpi_SDI : sbit; sfr; external;

Data In line.

var SoftSpi_SDI : sbit at RF2_bit;

var SoftSpi_SDO : sbit; sfr; external;

Data Out line.

var SoftSpi_SDO : sbit at LATF3_bit;

var SoftSpi_CLK : sbit; sfr; external;

Clock line.

var SoftSpi_CLK : sbit at LATF6_bit;

var SoftSpi_SDI_Direction : sbit; sfr;

external;

Direction of the

Data In pin.

var SoftSpi_SDI_Direction : sbit at

TRISF2_bit;

var SoftSpi_SDO_Direction : sbit; sfr;

external;

Direction of the

Data Out pin

var SoftSpi_SDO_Direction : sbit at

TRISF3_bit;

var SoftSpi_CLK_Direction : sbit; sfr;

external;

Direction of the

Clock pin.

var SoftSpi_CLK_Direction : sbit at

TRISF6_bit;

External dependencies of Software SPI Library

Library Routines

- Soft_SPI_Init

- Soft_SPI_Read

- Soft_SPI_Write