main.c

mega16 spi主从通信 测试通过（ICC）

//再放上SPI从机通信程序
#include "iom16v.h"
#include "macros.h"
#define uchar unsigned char
#define uint  unsigned int
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = 0x0B;//
 UBRRL = 0x2F; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi  fosc=7372800HZ,Baud=115200
 UCSRB = (1<<RXCIE)|(1<<TXCIE)|(1<<RXEN)|(1<<TXEN);//0xD8;//发送接受使能 中断使能
}
void Uart0Send(uchar CData)
{
 while(!(UCSRA&0x20));
 UDR = CData;
}
#define DDR_MISO  6
#define DDR_MOSI  5
#define DDR_SCK   7
#define DDR_SS    4
#define DDR_SPI   DDRB
/*-----------------------------------------------------------------
函数名称: void SPISlaveInit(void)
函数功能: SPI从机初始化
参    数: 
返 回 值: 无
-----------------------------------------------------------------*/
void SPISlaveInit(void)
{
    DDR_SPI &=~((1<<DDR_SCK)|(1<<DDR_MOSI));
    DDR_SPI |= (1<<DDR_MISO);
    SPCR = (1<<SPIE)|(1<<SPE)|(1<<SPR1)|(1<<SPR0);//使能接收中断|(1<<CPOL)|(1<<CPHA)
}
#pragma interrupt_handler spi_stc_isr:11
void spi_stc_isr(void)
{
 //byte in SPDR has been sent/received
 
 UDR = SPDR;
}

/*-----------------------------------------------------------------
函数名称: void SPIMasterTransmit(unsigned char i) 
函数功能: SPI数据发送
参    数: 
返 回 值: 无
-----------------------------------------------------------------*/
uchar SPISlaveRead1Byte(void) 
{ 
 while (!(SPSR & (1<<SPIF)));  // 等待传输结束 
 return SPDR;
}
void DeviceInit(void)
{
 CLI();
 uart0_init();
 SPISlaveInit();
 MCUCR = 0;
 TIMSK = 0;
 GICR  = 0;
 SEI();
}
void main(void)
{
 uchar temp;
 DDR_SPI &=~(1<<DDR_SS);
 DeviceInit();
 while(1)
 {
 
  //UDR = SPISlaveRead1Byte();
  ;
  //Uart0Send(temp);
 }
}