unsigned char avr_bin[]={"我爱AVR"};
//Mega16 SS P12 SCK P20 MOSI P11 RST P9 MISO P10 ACK P19
#define M16RST 9
#define M16SS 12
#define M16SCK 20
#define M16MOSI 11
#define M16MISO 10
#define M16ACK 19
#define SET_SCK_0() CLR_PIO(M16SCK)
#define SET_SCK_1() SET_PIO(M16SCK)
#define SET_MOSI_0() CLR_PIO(M16MOSI)
#define SET_MOSI_1() SET_PIO(M16MOSI)
#define SET_RST_0() CLR_PIO(M16RST)
#define SET_RST_1() SET_PIO(M16RST)
#define SET_SS_0() CLR_PIO(M16SS)
#define SET_SS_1() SET_PIO(M16SS)
#define GET_MISO() GET_PIO()&(0x01UL<<M16MISO)
#define GET_ACK() GET_PIO()&(0x01UL<<M16ACK)
#ifndef NOP
#define NOP asm("mov %r0,%r0")
#endif
void Delayus(unsigned long us)
{
unsigned long i;
do{
for(i=0;i<100;i++) NOP;
}while(--us);
}
uchar SPI_R_W(uchar d)
{
uchar i;
for(i=0;i<8;i++)
{
if(d&0x80) SET_MOSI_1();
else SET_MOSI_0();
SET_SCK_1();NOP;NOP; //时钟高
d<<=1;
if(GET_MISO()) d++;
SET_SCK_0();NOP;NOP;
}
return d;
}
//使能编程
uchar EnablePro()
{
unsigned char d;
SET_SCK_0();
SET_RST_1();
Delayus(5000);
SET_RST_0();
Delayus(25000); //at least 20ms
SPI_R_W(0xAC);
SPI_R_W(0x53);
d=SPI_R_W(0xFF);
SPI_R_W(0xFF);
uart0_Printf("编程使能答复:0x%02x",d);
if(d==0x53) d=1;
else d=0;
return d;
}
//读取芯片ID
void ReadAvrID()
{
unsigned char d;
uart0_Printf("AVR ID:");
SPI_R_W(0x30);
SPI_R_W(0x00);
SPI_R_W(0x00);
d=SPI_R_W(0x00);
uart0_Printf("%02X ",d);
SPI_R_W(0x30);
SPI_R_W(0x00);
SPI_R_W(0x01);
d=SPI_R_W(0x00);
uart0_Printf("%02X ",d);
SPI_R_W(0x30);
SPI_R_W(0x00);
SPI_R_W(0x02);
d=SPI_R_W(0x00);
uart0_Printf("%02X ",d);
}
//擦除Flash
void ErasFlash()
{
SPI_R_W(0xAC);
SPI_R_W(0x80);
SPI_R_W(0xFF);
SPI_R_W(0xFF);
Delayus(10000); //at least 10ms
uart0_Printf("擦除完毕
");
}
//写页缓冲数据
void WritePageCache(unsigned char *pt)
{
unsigned char i;
for(i=0;i<0x40;i++)
{
SPI_R_W(0x40);
SPI_R_W(0x00);
SPI_R_W(i);
SPI_R_W(*pt++);
SPI_R_W(0x48);
SPI_R_W(0x00);
SPI_R_W(i);
SPI_R_W(*pt++);
}
}
//将页缓冲数据写入Flash
void SavePage(unsigned int page)
{
page>>=1;
SPI_R_W(0x4C);
SPI_R_W(page/256);
SPI_R_W(page&0xFF);
SPI_R_W(0xFF);
Delayus(10000);
}
//逐页编程
void ProPage()
{
unsigned char *pt=avr_bin;
while(pt<avr_bin+sizeof(avr_bin))
{
WritePageCache(pt);
SavePage( ((unsigned long)pt)-((unsigned long)avr_bin));
pt+=128;
}
}
//写熔断时低字节
void WriteSettingLow(unsigned char d)
{
SPI_R_W(0xAC);
SPI_R_W(0xA0);
SPI_R_W(0xFF);
SPI_R_W(d);
Delayus(10000);
}
//写熔断丝高字节
void WriteSettingHight(unsigned char d)
{
SPI_R_W(0xAC);
SPI_R_W(0xA8);
SPI_R_W(0xFF);
SPI_R_W(d);
Delayus(10000);
}
//加密
void WriteLockBit(unsigned char d)
{
d|=0xC0;
SPI_R_W(0xAC);
SPI_R_W(0xFF);
SPI_R_W(0xFF);
SPI_R_W(d);
Delayus(10000);
}
//复位avr
void ResetAvr()
{
SET_RST_1();
}
//烧录
void avrpro()
{
while(!EnablePro()); //等待编程使能成功
ReadAvrID();
ErasFlash();
ProPage();
WriteSettingLow(0x2F);
WriteSettingHight(0xC9);
WriteLockBit(0xFC);
ResetAvr();
} |
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