Reading and writing of EEPROM works on AVR!

[goodfet] / firmware / apps / avr / avr.c

diff --git a/firmware/apps/avr/avr.c b/firmware/apps/avr/avr.c
index c86711d..c659034 100644 (file)
--- a/firmware/apps/avr/avr.c
+++ b/firmware/apps/avr/avr.c
@@ -19,8 +19,8 @@ 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;
@@ -36,7 +36,7 @@ void avrconnect(){
   avr_prgen();
 }
 
-//! Read and write an SPI byte.
+//! Read and write an SPI byte with delays.
 unsigned char avrtrans8(unsigned char byte){
   register unsigned int bit;
   //This function came from the SPI Wikipedia article.
@@ -68,8 +68,7 @@ u8 avrexchange(u8 a, u8 b, u8 c, u8 d){
   avrtrans8(b);
   if(avrtrans8(c)!=b){
     debugstr("AVR sync error, b not returned as c.");
-  }else{
-    debugstr("Synced properly.");
+    //Reconnect here?
   }
   return avrtrans8(d);
 }
@@ -79,27 +78,54 @@ void avr_prgen(){
   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);
+}
+
+//! 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);
+}
+
 //! Handles an AVR command.
 void avrhandle(unsigned char app,
               unsigned char verb,
               unsigned long len){
   unsigned long i;
+  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:
@@ -110,7 +136,24 @@ void avrhandle(unsigned char app,
     avrconnect();
     //no break 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_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: