Mikroelektronika MIKROE-350 Datenbogen

The mikroBasic PRO for AVR provides routines for implementing Software SPI com-
munication. 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.

- 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. 

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

346

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

dim Chip_Select as
sbit sfr external

Chip select line.

dim Chip_Select as
sbit at PORTB.B0

dim SoftSpi_SDI as
sbit sfr external

Data In line.

dim SoftSpi_SDI as
sbit at PINB.B6

dim SoftSpi_SDO as
sbit sfr external

Data Out line.

dim SoftSpi_SDO as
sbit at PORTB.B5

dim SoftSpi_CLK as
sbit sfr external

Clock line.

dim SoftSpi_CLK as
sbit at PORTB.B7

dim
Chip_Select_Direction
as sbit sfr external

Direction of the Chip
Select pin.

dim
Chip_Select_Direction
as sbit at DDRB.B0

dim
SoftSpi_SDI_Direction
as sbit sfr external

Direction of the Data In
pin.

dim
SoftSpi_SDI_Direction
as sbit at DDRB.B6

dim
SoftSpi_SDO_Direction
as sbit sfr external

Direction of the Data Out
pin

dim
SoftSpi_SDO_Direction
as sbit at DDRB.B5

dim
SoftSpi_CLK_Direction
as sbit sfr external

Direction of the Clock pin.

dim
SoftSpi_CLK_Direction
as sbit at DDRB.B7