#include <iomacros.h>
#include "avr.h"
+#include "glitch.h"
//! Setup the AVR pins.
void avrsetup(){
//! Initialized an attached AVR.
void avrconnect(){
- register int i;
- avrsetup();//set I/O pins
+ //set I/O pins
+ avrsetup();
//Pulse !RST (SS) at least twice while CLK is low.
CLRCLK;
SETSS;
CLRCLK;
- delay(500);
+ //delay(5);
CLRSS;
- delay(500);
+ //delay(5);
//Enable programming
avr_prgen();
}
-//! Read and write an SPI byte.
-unsigned char avrtrans8(unsigned char byte){
- register unsigned int bit;
+//! Read and write an SPI byte with delays.
+u8 avrtrans8(u8 byte){
+ register u16 bit;
//This function came from the SPI Wikipedia article.
//Minor alterations.
avrtrans8(a);
avrtrans8(b);
if(avrtrans8(c)!=b){
- debugstr("AVR sync error, b not returned as c.");
- }else{
- debugstr("Synced properly.");
+ //debugstr("AVR sync error, b not returned as c.");
+ //Reconnect here?
}
return avrtrans8(d);
}
avrexchange(0xAC, 0x53, 0, 0);
}
+//! Is the AVR ready or busy?
+u8 avr_isready(){
+ return avrexchange(0xF0, 0, 0, 0);
+}
+
//! Read AVR device code.
-u8 avr_devicecode(){
+u8 avr_sig(u8 i){
return avrexchange(0x30, //Read signature byte
0x00,
- 0x00, //&0x03 is sig adr
- 0x00 //don't care.
+ i&0x03, //sig adr
+ 0x00 //don't care.
);
}
+//! Erase an AVR device
+void avr_erase(){
+ avrexchange(0xAC, 0x80, 0, 0);
+}
+
+//! Read lock bits.
+u8 avr_lockbits(){
+ return avrexchange(0x58, 0, 0, 0);
+}
+//! Write lock bits.
+void avr_setlock(u8 bits){
+ avrexchange(0xAC,0xE0,0x00,
+ bits);
+}
+
+//! Read a byte of EEPROM.
+u8 avr_peekeeprom(u16 adr){
+ return avrexchange(0xA0, adr>>8, adr&0xFF, 0);
+}
+//! Read a byte of EEPROM.
+u8 avr_pokeeeprom(u16 adr, u8 val){
+ return avrexchange(0xC0, adr>>8, adr&0xFF, val);
+}
+
+//! Read a byte of Flash
+u8 avr_peekflash(u16 adr){
+ u16 a=adr>>1;
+ if(adr&1) //high byte
+ return avrexchange(0x28,a>>8,a&0xff,0);
+ else //low byte
+ return avrexchange(0x20,a>>8,a&0xff,0);
+}
+
+
//! Handles an AVR command.
void avrhandle(unsigned char app,
unsigned char verb,
unsigned long len){
unsigned long i;
+ unsigned int at;
+ static u8 connected=0;
+ /*
+ if(!avr_isready() && connected)
+ debugstr("AVR is not yet ready.");
+ */
switch(verb){
case READ:
case WRITE:
for(i=0;i<len;i++)
- cmddata[i]=spitrans8(cmddata[i]);
+ cmddata[i]=avrtrans8(cmddata[i]);
txdata(app,verb,len);
break;
case SETUP:
avrsetup();
txdata(app,verb,0);
break;
- case START://returns device code
+ case START:
avrconnect();
- //no break here
+ txdata(app,verb,0);
+ break;//Used to fall through here.
case AVR_PEEKSIG:
- cmddata[0]=avr_devicecode();
+ for(i=0;i<4;i++)
+ cmddata[i]=avr_sig(i);
+ txdata(app,verb,4);
+ break;
+ case AVR_ERASE:
+ avr_erase();
+ txdata(app,verb,0);
+ break;
+ case AVR_PEEKLOCK:
+ cmddata[0]=avr_lockbits();
+ txdata(app,verb,1);
+ break;
+ case AVR_POKELOCK:
+ avr_setlock(cmddata[0]);
+ txdata(app,verb,0);
+ break;
+ case AVR_POKEEEPROM:
+ avr_pokeeeprom(cmddataword[0], cmddata[2]);
+ //no break here.
+ case AVR_PEEKEEPROM:
+ cmddata[0]=avr_peekeeprom(cmddataword[0]);
txdata(app,verb,1);
break;
case PEEK:
+ //cmddata[0]=avr_peekflash(cmddataword[0]);
+ //txdata(app,verb,1);
+ at=cmddataword[0];
+
+ //Fetch large blocks for bulk fetches,
+ //small blocks for individual peeks.
+ if(len>2){
+ len=(cmddataword[1]);//always even.
+ }else{
+ len=1;
+ }
+ txhead(app,verb,len);
+ for(i=0;i<len;i++){
+ serial_tx(avr_peekflash(at++));
+ }
+ break;
case POKE:
default:
debugstr("Verb unimplemented in AVR application.");