README.md

spi-unit

SPI driver for AVR microcontroller

Version : 0.0.0

• Type : Embedded Software.

• Support : AVR microcontroller.

• Program Language : C/C++

• Properties :

Initialization and de-initialization functions:

• SPI_Init()
• SPI_DeInit()
• SPI_DefaultMasterInit()
• SPI_DefaultSlaveInit()

IO operation functions:

• SPI_Transmit()
• SPI_Receive()
• SPI_TransmitReceive()
• SPI_Transmit_IT()
• SPI_Receive_IT()
• SPI_TransmitReceive_IT()

How to use this driver

The SPI driver can be used as follows:

1.1 Set SPI DDR Register & Pins in the spi_unit_conf.h header, for example:

   /* ------ SPI DDR Register ------ */
   #define _DDR_SPI   DDRB  
   
   /* ---------- SPI Pins ---------- */  
   #define _MOSI_PIN  3  
   #define _MISO_PIN  4  
   #define _SCK_PIN   5  

1.2 Move out the SPI_TxCpltCallback() function from spi_unit_conf.h and paste in .c file

2.1 Manual initialize:

• Declare a SPI_InitTypeDef initialize structure, for example:

  SPI_InitTypeDef uspi;
  

• Set your configuration in SPI_InitTypeDef, for example:

  uspi.Mode = _SPI_MODE_MASTER  
  uspi.FirstBit = _SPI_FIRSTBIT_MSB;  
  uspi.ClockPhase = _SPI_CLOCKPHASE_FIRSTEDGE;  
  uspi.ClockPolarity = _SPI_CLOCKPOLARITY_LOW;  
  uspi.ClockFrequency = _SPI_CLOCKRATE_FCPU_16;  
  

• Initialize the SPI by implementing the SPI_Init() API:

  SPI_Init(&uspi);
  

2.2 Default initialize: Initialize the SPI by implementing the SPI_DefaultxInit() API:

   SPI_DefaultMasterInit();   
   SPI_DefaultSlaveInit(); 

3.1 If using SPI_x_IT functions, enable the SPI Interrupt by __SPI_ENABLE_IT macro, for example:

   // First enable your global interrupt   
   __SPI_ENABLE_IT

4.1 Enable the SPI Peripheral by __SPI_ENABLE macros, for example:

   __SPI_ENABLE

5.1 use the IO operation functions, for example:

   SPI_Transmit("Hello Word", 10, 1000);  

Developer: Majid Derhambakhsh