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请教一下傻孩子师兄一个简单的问题：我用SPI的时候怎么不能同时显示：主机发送后，从机要复位才能接受一个数据呢？
88主机发送:
#include <iom88v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int
#include "SP027DriverV2.h"
#define ChangeEdge EICRA ^= BIT(ISC10)
#define SS PB2 //chip select
#define MOSI PB3 //input
#define MISO PB4 //output
#define SCK PB5 //clock
#define SS_SET (PORTB|=(1<<SS))
#define SS_CLR (PORTB &= ~(1<<SS))
signed long PlusCounter=0; //脉冲计数器,用于计算从上电开始计算的相对脉冲个数
int lap=0;
unsigned char ss=0;
void delay(uint ms)
{
uint i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<1141;j++);
}
}
void port_init(void)
{
PORTB = 0xFF;
DDRB = 0xFF;
PORTC = 0xFF; //m103 output only
DDRC = 0xFF;
PORTD = 0xFF;
DDRD = 0xFF;
}
#pragma interrupt_handler int1_isr:iv_INT1//编码器程序,原打算发送它的
void int1_isr(void)
{
ChangeEdge;
if((PIND&0X08)!=0)
if((PINC&0X01)==0)
{
PlusCounter++;
}
else
{
PlusCounter--;
}
else
if((PINC&0X01)!=0)
{
PlusCounter++;
}
else
{
PlusCounter--;
}
}
#pragma interrupt_handler pcint1_isr:iv_PCINT1
void pcint1_isr(void) //PCINT0中断服务函数
{
if((PINC&0X01)!=0)
if((PIND&0X08)!=0)
{
PlusCounter++;
}
else
{
PlusCounter--;
}
else
if((PIND&0X08)==0)
{
PlusCounter++;
}
else
{
PlusCounter--;
//DispNum16(PlusCounter);
}
}
void init_devices(void)
{
CLI(); //disable all interrupts
port_init();
MCUCR = 0x00;
EICRA = 0x08; //extended ext ints
EIMSK = 0x02;
TIMSK0 = 0x00; //timer 0 interrupt sources
TIMSK1 = 0x00; //timer 1 interrupt sources
TIMSK2 = 0x00; //timer 2 interrupt sources
PCMSK0 = 0x00; //pin change mask 0
PCMSK1 = 0x01; //pin change mask 1
PCMSK2 = 0x00; //pin change mask 2
PCICR = 0x02; //pin change enable
PRR = 0x00; //power controller
SEI(); //re-enable interrupts
}
void Spi_Transmit( char cData)
{
// 启动数据发送
SPDR = cData;
// 等待发送完成
while (!(SPSR & BIT(SPIF)));
//return SPDR;
}
void main(void)
{
char i=0;
init_devices();
DDRB =(1<<MOSI)|(1<<SCK)|(1<<SS);
DDRB &=~(1<<MISO);
PORTB |= BIT(SS)|BIT(MISO);//主机空闲、带上拉
SPCR = 0x53;
SPSR = 0x00;
while(1)
{
SS_CLR;
Spi_Transmit(i);
SS_SET;
i++;
if(i>50)
{
i=0;
}
DispNum16(i); //SP027显示
delay(1000);
}
}
16从机用串口再发送给电脑：
#include <iom16v.h>
#include <macros.h>
#include "SP027DriverV2.h"
#define uchar unsigned char
#define uint unsigned int
#define mclk 8000000
#define SS PB4 //chip select
#define MOSI PB5 //input
#define MISO PB6 //output
#define SCK PB7 //clock
#define SS_SET (PORTB|=(1<<SS))
#define SS_CLR (PORTB &= ~(1<<SS))
#define ChangeEdge0 MCUCR ^= BIT(ISC00)
#define ChangeEdge1 MCUCR ^= BIT(ISC10)
unsigned char ss;
long PlusCounter=0;
void delay(void)
{
unsigned char i;
for(i=0;i<255;i++);
}
void delay1(uint ms)
{
uint i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<1141;j++);
}
}
void port_init(void)
{
DDRA = 0xFF;
PORTA = 0xFF;
PORTB = 0xFF;
DDRB = 0xFF;
PORTC = 0xFF; //m103 output only
DDRC = 0xFF;
PORTD = 0xFF;
DDRD = 0x00;
}
void uart_init(uint baud)
{
UCSRB=0x00;
UCSRA=0x00; //控制寄存器清零
UCSRC=(1<<URSEL)|(0<<UPM0)|(3<<UCSZ0);
//选择UCSRC，异步模式，禁止
// 校验，1位停止位，8位数据位
baud=mclk/16/baud-1 ; //波特率最大为65K
UBRRL=baud;
UBRRH=baud>>8; //设置波特率
UCSRB=(1<<TXEN)|(1<<RXEN)|(1<<RXCIE);
//接收、发送使能，接收中断使能
SREG|=BIT(7); //全局中断开放
DDRD|=0X02; //配置TX为输出（很重要?
}
#pragma interrupt_handler uart0_rx_isr:iv_USART0_RXC
void uart0_rx_isr(void)
{
ss=UDR;
}
void UART_Transmit(unsigned char ch_Data)
{
while(!(UCSRA & (1<<UDRE)));
//UCSRB &= ~(1<<TXB8);
//if(ch_Data & 0x0100)
//{
//UCSRB |= (1<<TXB8);
//}
UDR = ch_Data;
}
void UART_Send_Int(signed long Data)
{
unsigned char ch_Temp = 0;
unsigned char Temp_A_L; //必须为Unsignged
signed char Temp_A_H;
signed char Temp_B_L;
signed char Temp_B_H;
Temp_A_L = Data; //发送第一个8位字节
Temp_A_H = Data>>8;
Temp_B_L = Data >> 16;
Temp_B_H = Data >> 24;
UART_Transmit(0xaa); //开始发送位
UART_Transmit(0x09);
UART_Transmit(0x01);
ch_Temp ^= 0x09; //校验9位
ch_Temp ^= 0x01;
ch_Temp ^= Temp_B_H;
ch_Temp ^= Temp_B_L;
ch_Temp ^= Temp_A_H;
ch_Temp ^= Temp_A_L;
UART_Transmit(Temp_B_H);
UART_Transmit(Temp_B_L);
UART_Transmit(Temp_A_H);
UART_Transmit(Temp_A_L);
UART_Transmit(ch_Temp);
UART_Transmit(0x55); //结束位
}
unsigned char SpiReadByte(void)
{
PORTC ^= BIT(2);
while(!( SPCR&BIT(SPIF) ))
;
return SPDR;
}
void main(void)
{
signed char i;
port_init();
uart_init(38400);
DDRB = BIT(MISO);
DDRB &=~(BIT(MOSI)|BIT(SS)|BIT(SCK));
DDRB |= BIT(1)|BIT(0);
PORTB |=BIT(MOSI)|BIT(SS)|(SCK);//上拉
SPCR = 0xC0;
SPSR = 0x00;
PORTC ^=BIT(2);
while(1)
{
i = SpiReadByte();
UART_Send_Int(i);
DispNum16(i); //SP027显示
delay1(10);
}
} |
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发表于 2009-11-18 22:43:44
楼主