Mikroelektronika MIKROE-350 データシート

- Soft_SPI_Init 
- Soft_SPI_Read 
- Soft_SPI_Write 

347

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure Soft_SPI_Init()

Nothing.

Configures and initializes the software SPI module.

Global variables:

- 

Chip_Select:

Chip select line 

- 

SoftSpi_SDI:

Data in line 

- 

SoftSpi_SDO:

Data out line 

- 

SoftSpi_CLK:

Data clock line 

- 

Chip_Select_Direction:

Direction of the Chip select pin 

- 

SoftSpi_SDI_Direction:

Direction of the Data in pin 

- 

SoftSpi_SDO_Direction:

Direction of the Data out pin 

- 

SoftSpi_CLK_Direction:

Direction of the Data clock pin 

must be defined before using this function.

' soft_spi pinout definition
dim Chip_Select as sbit at PORTB.B0    
dim SoftSpi_SDI as sbit at PINB.B6            
dim SoftSpi_SDO as sbit at PORTB.B5          
dim SoftSpi_CLK as sbit at PORTB.B7           
dim Chip_Select_Direction as sbit at DDRB.B0
dim SoftSpi_SDI_Direction as sbit at DDRB.B6  
dim SoftSpi_SDO_Direction as sbit at DDRB.B5  
dim SoftSpi_CLK_Direction as sbit at DDRB.B7
' end of soft_spi pinout definition

...
Soft_SPI_Init() ' Init Soft_SPI