#include "platform.h"
#include "command.h"
-#include <signal.h>
-#include <io.h>
-#include <iomacros.h>
#include "avr.h"
+//#include "glitch.h"
+//
+//! Handles an AVR command.
+void avr_handle_fn( uint8_t const app,
+ uint8_t const verb,
+ uint32_t const len);
+
+// define the jtag app's app_t
+app_t const avr_app = {
+
+ /* app number */
+ XAVR,
+
+ /* handle fn */
+ avr_handle_fn,
+
+ /* name */
+ "AVR",
+
+ /* desc */
+ "\tThe AVR app adds support for debugging AVR based devices.\n"
+};
//! 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(); //Cut this?
+
+ SETSS;
+ //delay(50);
+
//Pulse !RST (SS) at least twice while CLK is low.
+ CLRCLK;
CLRSS;
+ //delay(5);
+
+ SETSS;
CLRCLK;
-
- for(i=0;i<5;i++){
- SETSS;
- CLRSS;
- }
-
+ //delay(5);
+ CLRSS;
+ //delay(5);
+
//Enable programming
avr_prgen();
}
+//! 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.
+
+ for (bit = 0; bit < 8; bit++) {
+ /* write MOSI on trailing edge of previous clock */
+ if (byte & 0x80)
+ SETMOSI;
+ else
+ CLRMOSI;
+ byte <<= 1;
+
+ delay(2);
+ SETCLK;
+
+ /* read MISO on trailing edge */
+ byte |= READMISO;
+ delay(2);
+ CLRCLK;
+ }
+
+ return byte;
+}
+
//! Perform a 4-byte exchange.
u8 avrexchange(u8 a, u8 b, u8 c, u8 d){
- spitrans8(a);
- spitrans8(b);
- if(spitrans8(c)!=b){
- debugstr("AVR sync error, b not returned as c.");
+ avrtrans8(a);
+ avrtrans8(b);
+ if(avrtrans8(c)!=b){
+ //debugstr("AVR sync error, b not returned as c.");
+ //Reconnect here?
}
- spitrans8(c);
- return spitrans8(d);
+ return avrtrans8(d);
}
//! Enable AVR programming mode.
void avr_prgen(){
- avrexchange(0xac, 0x53, 0, 0);
+ 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);
+}
+
+void avr_bulk_load(u16 start, u16 len, u8 *data) {
+ u16 adr;
+ for (adr = 0; adr < len; adr++) {
+ u16 a = adr + start;
+ avrexchange((adr & 1) ? 0x48 : 0x40,
+ a >> 9,
+ (a >> 1) & 0xff,
+ data[adr]);
+ }
+}
+
//! Handles an AVR command.
-void avrhandle(unsigned char app,
- unsigned char verb,
- unsigned long len){
- unsigned long i;
-
-
+void avr_handle_fn( uint8_t const app,
+ uint8_t const verb,
+ uint32_t const len)
+{
+ unsigned long i, l;
+ unsigned int at;
+
+ /*
+ 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:
case START:
avrconnect();
txdata(app,verb,0);
+ break;//Used to fall through here.
+ case STOP:
+ SETSS;
+ txdata(app, verb, 0);
+ case AVR_PEEKSIG:
+ 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 AVR_BULKLOAD:
+ if (len < 3) {
+ debugstr("Length too short");
+ txdata(app, NOK, 0);
+ } else {
+ at = cmddataword[0];
+ avr_bulk_load(at, len - 2, cmddata + 2);
+ txdata(app, verb, 0);
+ }
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.
+ l = len;
+ if(l>2){
+ l=(cmddataword[1]);//always even.
+ }else{
+ l=1;
+ }
+ txhead(app,verb,l);
+ for(i=0;i<l;i++){
+ serial_tx(avr_peekflash(at++));
+ }
+ break;
case POKE:
default:
debugstr("Verb unimplemented in AVR application.");