picadae_cmd.py : changed serial output to show all received data in integer format.

ctrl/main.c : write commands now send as many data bytes as received rather than just 2.
tiny/main.c : Added timer0 and PCM1 options. Added table and EEPROM reading/writing.
tiny/Makefile: Enabled 'brown-out-detection'.

control/app/picadae_cmd.py

@@ -152,7 +152,7 @@ class App:
         cmdD = {
             'p':{ 'reg':0, 'n':1, 'min':0, 'max':4 },       # timer pre-scalar: sets timer tick rate
             't':{ 'reg':1, 'n':2, 'min':0, 'max':10e7 },    # microseconds
-            'd':{ 'reg':3, 'n':1, 'min':0, 'max':100 },    # pwm duty cylce (0-100%)
+            'd':{ 'reg':3, 'n':1, 'min':0, 'max':100 },     # pwm duty cylce (0-100%)
             'f':{ 'reg':4, 'n':1, 'min':1, 'max':5 },       # pwm frequency divider 1=1,2=8,3=64,4=256,5=1024
             }
 
@@ -190,6 +190,7 @@ class App:
             
             coarse = int(value/(32*254))
             fine   = int((value - coarse*32*254)/32)
+            print(coarse,fine)
             dataL  = [ coarse, fine ]
 
         elif opcode == 'd':
@@ -272,7 +273,6 @@ class App:
                 
             op_byteN = len(dataL)
             
-
         # form the command into a byte array
         cmd_bV = bytearray( [ ord(op_code), i2c_addr, reg_addr, op_byteN ] + dataL )
         
@@ -293,7 +293,7 @@ class App:
             if (i):
                 s = sys.stdin.readline().strip()
                 
-                if s == 'quit':
+                if s == 'quit' or s == 'q':
                     break
                 
                 cmd_bV,err_msg = self.parse_cmd(s)
@@ -310,7 +310,11 @@ class App:
 
                 # if a serial msg was received
                 if msg is not None and msg[0] == DATA_MSG:
-                    print("ser:",msg[1],int(msg[1][0]))
+                    str = ""
+                    for i in range(len(msg[1])):
+                        str += "{} ".format(int(msg[1][i]))
+                        
+                    print("ser:",str)
             
             
         self.serialProc.quit()

control/ctrl/main.c

@@ -20,7 +20,7 @@ volatile int  ser_buf_i_idx = 0;  // receive buffer input index
 int           ser_buf_o_idx = 0;  // receive buffer output index
 
 // Receive buffer
-char buf[ SER_BUF_N ];
+char ser_buf[ SER_BUF_N ];
 
 
 void uart_init(void)
@@ -105,7 +105,7 @@ void i2c_init()
 ISR(USART_RX_vect)
 {
   // receive the incoming byte
-  buf[ ser_buf_i_idx ] = uart_getchar();
+  ser_buf[ ser_buf_i_idx ] = uart_getchar();
 
   // advance the buffer input index
   ser_buf_i_idx = (ser_buf_i_idx + 1) % SER_BUF_N;  
@@ -141,13 +141,16 @@ int main (void)
   const uint8_t kWaitFl       = 1;
   const uint8_t kSendStopFl   = 1;
   const uint8_t kNoSendStopFl = 0;
+  const uint8_t data_bufN     = 0xff;
   
   char    c;
-  uint8_t state = kWait_for_cmd;
-  char    cmd;
-  uint8_t i2c_addr;
-  uint8_t dev_reg_addr;
-  uint8_t op_byte_cnt;
+  uint8_t state = kWait_for_cmd;  // parser state
+  char    cmd;                    // 'r' or 'w'
+  uint8_t i2c_addr;               // remote i2c address
+  uint8_t dev_reg_addr;           // remote device register address
+  uint8_t op_byte_cnt;            // count of data bytes to send or recv
+  uint8_t data_buf[ data_bufN ];  // hold data during parsing
+  uint8_t data_buf_idx = 0;       // next avail slot in the data buffer
   
   cli();        // mask all interupts
 
@@ -173,14 +176,14 @@ int main (void)
     if( ser_buf_o_idx != ser_buf_i_idx )
     {
       // get the waiting byte
-      c = buf[ser_buf_o_idx];
+      c = ser_buf[ser_buf_o_idx];
 
       // advance the buffer output index
       ser_buf_o_idx = (ser_buf_o_idx+1) % SER_BUF_N;
 
       //  Serial Protocol
-      //  'r', reg-idx, cnt,                      -> i2c_read_from()
-      //  'w', reg-idx, cnt, value0, ... valueN   -> i2c_xmit()
+      //  'r', i2c-addr, reg-idx, cnt,                      -> i2c_read_from()
+      //  'w', i2c-addr, reg-idx, cnt, value0, ... valueN   -> i2c_xmit()
       
       switch(state)
       {
@@ -191,7 +194,7 @@ int main (void)
             state = kWait_for_i2c;
           }
           else
-            uart_putchar('E');
+            uart_putchar('E');  // indicate a protocol error
           break;
 
         case kWait_for_i2c:
@@ -215,16 +218,30 @@ int main (void)
           else
           {
             state = kWait_for_value;
+            data_buf[0] = dev_reg_addr; // make 'dev_reg_addr' the first data value to write
+            data_buf_idx = 1;           // 
+            op_byte_cnt += 1;           // incr op_byte_cnt to account for 'dev_reg_addr' as first byte
+              
           }
           break;
             
         case kWait_for_value:
+          if( data_buf_idx >= data_bufN )
           {
-            uint8_t buf[] = { dev_reg_addr, c };
-                      
-            i2c_xmit( I2C_REMOTE_ADDR, buf, 2, kSendStopFl);
+            uart_putchar('F'); // indicate a buffer overrun
             state = kWait_for_cmd;
           }
+          else
+          {
+            data_buf[ data_buf_idx++ ] = c;
+          
+            if(data_buf_idx == op_byte_cnt )
+            {
+              
+              i2c_xmit( I2C_REMOTE_ADDR, data_buf, op_byte_cnt, kSendStopFl);
+              state = kWait_for_cmd;
+            }
+          }
           break;
             
       }            

control/tiny/Makefile

@@ -22,7 +22,7 @@ all:
 	$(OBJ2HEX) -R .eeprom -O ihex $(TARGET) $(TARGET).hex
 
 burn:
-	$(AVRDUDE) -p $(MCU) -P $(TTY)  -C/etc/avrdude/avrdude.conf -v -c avrisp -b 19200 -U flash:w:$(TARGET).hex -U lfuse:w:0xe2:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m
+	$(AVRDUDE) -p $(MCU) -P $(TTY)  -C/etc/avrdude/avrdude.conf -v -c avrisp -b 19200 -U flash:w:$(TARGET).hex -U lfuse:w:0xe2:m -U hfuse:w:0xdd:m -U efuse:w:0xff:m
 clean:
 	rm -f *.hex *.obj *.o
 

control/tiny/i2c_timer_pwm.c

@@ -1,3 +1,15 @@
+/*                                    
+                                    AT TINY 85
+                                     +--\/--+
+                              RESET _| 1  8 |_ +5V
+             ~OC1B       HOLD  DDB3 _| 2  7 |_ SCL
+              OC1B      ONSET  DDB4 _| 3  6 |_ DDB1 LED
+                                GND _| 4  5 |_ SDA
+                                     +------+
+        * = Serial and/or programming pins on Arduino as ISP
+*/
+
+
 // This program acts as the device (slave) for the control program i2c/a2a/c_ctl
 #define F_CPU 8000000L
 #include <stdio.h>
@@ -7,123 +19,397 @@
 
 #include "usiTwiSlave.h"
 
+
 #define I2C_SLAVE_ADDRESS 0x8 // the 7-bit address (remember to change this when adapting this example)
 
 
 enum
 {
- kCS13_10_idx     = 0,  // Timer 1 Prescalar (CS13,CS12,CS11,CS10) from Table 12-5 pg 89 (0-15)  prescaler = pow(2,val-1), 0=stop,1=1,2=2,3=4,4=8,....14=8192,15=16384  pre_scaled_hz = clock_hz/value
- kTmr0_Coarse_idx = 1,  // count of times timer0 count to 255 before OCR1C is set to Tmr0_Fine
- kTmr0_Fine_idx   = 2,  // OCR1C timer match value
- kPWM_Duty_idx    = 3,  //
- kPWM_Freq_idx    = 4,  // 1-4 = clock divider=1=1,2=8,3=64,4=256,5=1024
+ kTmr0_Prescale_idx =  0,  // Timer 0 clock divider: 1=1,2=8,3=64,4=256,5=1024
+ kTmr0_Coarse_idx   =  1,  // 
+ kTmr0_Fine_idx     =  2,  //
+ kPWM0_Duty_idx     =  3,  //
+ kPWM0_Freq_idx     =  4,  // 1-4 = clock divider=1=1,2=8,3=64,4=256,5=1024 
+ kCS13_10_idx       =  5,  // Timer 1 Prescalar (CS13,CS12,CS11,CS10) from Table 12-5 pg 89 (0-15)  prescaler = pow(2,val-1), 0=stop,1=1,2=2,3=4,4=8,....14=8192,15=16384  pre_scaled_hz = clock_hz/value
+ kTmr1_Coarse_idx   =  6,  // count of times timer0 count to 255 before OCR1C is set to Tmr0_Fine
+ kTmr1_Fine_idx     =  7,  // OCR1C timer match value
+ kPWM1_Duty_idx     =  8,  //
+ kPWM1_Freq_idx     =  9,  // 
+ kTable_Addr_idx    = 10,  // Next table address to read/write 
+ kTable_Coarse_idx  = 11,  // Next table coarse value to read/write
+ kTable_Fine_idx    = 12,  // Next table fine value to read/write
+ kMax_idx
 };
 
+
 volatile uint8_t ctl_regs[] =
 {
-   9,    // 0  9=32 us period w/ 8Mhz clock (timer tick rate) 
- 123,    // 1 (0-255) Tmr0_Coarse count of times timer count to 255 before loading Tmr0_Minor for final count.
-   8,    // 2 (0-254) Tmr0_Fine OCR1C value on final phase before triggering timer
- 127,    // 3 (0-255) Duty cycle
- 4,      // 4 (1-4)   PWM Frequency (clock pre-scaler) 
+   4,    //  0 (1-5)    4=32us per tick
+ 123,    //  1 (0-255)  Timer 0 Coarse Value 
+   8,    //  2 (0-255)  Timer 0 Fine Value
+ 127,    //  3 (0-255) Duty cycle
+   4,    //  4 (1-4)   PWM Frequency (clock pre-scaler)   
+   9,    //  5  9=32 us period w/ 8Mhz clock (timer tick rate) 
+ 123,    //  6 (0-255) Tmr1_Coarse count of times timer count to 255 before loading Tmr0_Minor for final count.
+   8,    //  7 (0-254) Tmr1_Fine OCR1C value on final phase before triggering timer
+ 127,    //  8 (0-255) PWM1 Duty cycle
+ 254,    //  9 (0-255) PWM1 Frequency  (123 hz)
+   0,    // 10 (0-127) Next table addr to read/write
+   0,    // 11 (0-255) Next table coarse value to write
+   0,    // 12 (0-255) Next table fine value to write
 };
 
-// Tracks the current register pointer position
-volatile uint8_t reg_position = 0;
-const uint8_t reg_size = sizeof(ctl_regs);
+#define tableN 256
+uint8_t table[ tableN ];
+ 
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// EEPROM
+//
+
+void EEPROM_write(uint8_t ucAddress, uint8_t ucData)
+{
+  // Wait for completion of previous write 
+  while(EECR & (1<<EEPE))
+  {}
+    
+  EECR = (0<<EEPM1)|(0<<EEPM0); // Set Programming mode   
+  EEAR = ucAddress;             // Set up address and data registers 
+  EEDR = ucData;  
+  EECR |= (1<<EEMPE);           // Write logical one to EEMPE 
+  EECR |= (1<<EEPE);            // Start eeprom write by setting EEPE 
+}
+
+
+uint8_t EEPROM_read(uint8_t ucAddress)
+{
+  // Wait for completion of previous write 
+  while(EECR & (1<<EEPE))
+  {}
+    
+  EEAR = ucAddress;  // Set up address register 
+  EECR |= (1<<EERE); // Start eeprom read by writing EERE 
+  return EEDR;       // Return data from data register 
+}
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// Read/Write table
+//
+
+// To write table value 42 to 127 (coarse) 64 (fine)
+//
+// w 8 kTable_Addr_idx 42
+// w 8 kTable_Coarse_idx 127
+// w 8 kTable_fine_idx 64
+//
+// TO read table value 42
+// w 8 kTable_Addr_idx 42
+// r 8 kTable_Coarse_idx -> 127
+// r 8 kTable_Fine_idx   ->  64
+
+
+#define eeprom_addr( addr ) (kMax_idx + (addr))
+
+void table_write_cur_value( void )
+{
+  uint8_t tbl_addr = ctl_regs[ kTable_Addr_idx ] * 2;
+  
+  table[ tbl_addr+0 ] = ctl_regs[ kTable_Coarse_idx ];
+  table[ tbl_addr+1 ] = ctl_regs[ kTable_Fine_idx ];
+
+  EEPROM_write( eeprom_addr( tbl_addr+0 ), ctl_regs[ kTable_Coarse_idx ] );
+  EEPROM_write( eeprom_addr( tbl_addr+1 ), ctl_regs[ kTable_Fine_idx ]); 
+}
+
+void table_load( void )
+{
+  uint8_t i = 0;
+
+  for(; i<128; ++i)
+  {
+    uint8_t tbl_addr  = i*2;
+    table[tbl_addr+0] = EEPROM_read( eeprom_addr(tbl_addr+0) );
+    table[tbl_addr+1] = EEPROM_read( eeprom_addr(tbl_addr+1) );
+  }  
+}
+
+void restore_memory_from_eeprom( void )
+{
+  /*
+  uint8_t i;
+  for(i=0; i<kMax_idx; ++i)
+  {
+    ctl_regs[i] = EEPROM_read( eeprom_addr( i ) );
+  }
+  */
+  
+  table_load();
+}
+
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// Timer0
+//
 
-volatile uint8_t tmr_state        = 0;    
-volatile uint8_t tmr_coarse_cur   = 0;
+volatile uint8_t tmr0_state        = 0;    // 0=disabled 1=coarse mode, 2=fine mode 
+volatile uint8_t tmr0_coarse_cur   = 0;
 
-void tmr_reset()
+// Use the current tmr0 ctl_reg[] values to set the timer to the starting state.
+void tmr0_reset()
 {
+  // if a coarse count exists then go into coarse mode 
   if( ctl_regs[kTmr0_Coarse_idx] > 0 )
   {
-    tmr_state = 1;
-    OCR1C     = 254;
+    tmr0_state = 1;
+    OCR0A      = 0xff;
   }
-  else
+  else // otherwise go into fine mode
   {
-    tmr_state = 2;
-    OCR1C     = ctl_regs[kTmr0_Fine_idx];
+    tmr0_state = 2;
+    OCR0A     = ctl_regs[kTmr0_Fine_idx];
   }
   
-  tmr_coarse_cur = 0;  
+  tmr0_coarse_cur = 0;  
 }
 
-ISR(TIMER1_OVF_vect)
+ISR(TIMER0_COMPA_vect)
 {
-  switch( tmr_state )
+  switch( tmr0_state )
   {
     case 0:
+      // disabled
       break;
-      
-    case 1:
-      if( ++tmr_coarse_cur >= ctl_regs[kTmr0_Coarse_idx] )
+
+    case 1: 
+      // coarse mode
+      if( ++tmr0_coarse_cur >= ctl_regs[kTmr0_Coarse_idx] )
       {
-        tmr_state  = 2;
-        OCR1C     = ctl_regs[kTmr0_Fine_idx];        
+        tmr0_state  = 2;
+        OCR0A     = ctl_regs[kTmr0_Fine_idx];        
       }
       break;
-      
+
     case 2:
-      PINB = _BV(PINB4) + _BV(PINB1);  // writes to PINB toggle the pins
+      // fine mode
+      PINB = _BV(PINB4);  // writes to PINB toggle the pins
 
-      tmr_reset();
+      tmr0_reset(); // restart the timer 
       break;
   }
-  
-  
 }
 
 
-void timer1_init()
+void timer0_init()
 {
-  TIMSK  &= ~_BV(TOIE1);    // Disable interrupt TIMER1_OVF
-  OCR1A   = 255;            // Set to anything greater than OCR1C (the counter never gets here.)
-  TCCR1  |= _BV(CTC1);      // Reset TCNT1 to 0 when TCNT1==OCR1C 
-  TCCR1  |= _BV(PWM1A);     // Enable PWM A
-  TCCR1  |= ctl_regs[kCS13_10_idx] & 0x0f;  // 
-  GTCCR  |= _BV(PSR1);      // Set the pre-scaler to the selected value
+  TIMSK  &= ~_BV(OCIE0A);    // Disable interrupt TIMER1_OVF
+  TCCR0A  |=  0x02;           // CTC mode
+  TCCR0B  |= ctl_regs[kTmr0_Prescale_idx]; // set the prescaler
 
-  tmr_reset();
+  GTCCR  |= _BV(PSR0);      // Set the pre-scaler to the selected value
   
-  TIMSK  |= _BV(TOIE1);     // Enable interrupt TIMER1_OVF
+  tmr0_reset();              // set the timers starting state
   
+  TIMSK  |= _BV(OCIE0A);     // Enable interrupt TIMER1_OVF  
+
 }
 
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// PWM (Timer0)
+//
+
 void pwm0_update()
 {
-  OCR0B   = ctl_regs[kPWM_Duty_idx];  // 50% duty cycle
-  TCCR0B |= ctl_regs[kPWM_Freq_idx]; // PWM frequency pre-scaler
+  OCR0B   = ctl_regs[kPWM0_Duty_idx];  // 50% duty cycle
+  TCCR0B |= ctl_regs[kPWM0_Freq_idx]; // PWM frequency pre-scaler
 }
 
 void pwm0_init()
 {
-  //WGM[1:0] = 3 (TOP=255)
+  // WGM[1:0] = 3 (TOP=255)
   // OCR0B = duty cycle (0-100%)
   // COM0A[1:0] = 2 non-inverted
   //
 
   TCCR0A |=  0x20   + 3;    // 0x20=non-inverting 3=WGM bits Fast-PWM mode (0=Bot 255=Top)
   TCCR0B |=  0x00   + 4;    //                    3=256 pre-scaler  122Hz=1Mghz/(v*256) where v=64
+  
+  GTCCR  |= _BV(PSR0);      // Set the pre-scaler to the selected value
 
   pwm0_update();
+
+  
+  DDRB |= _BV(DDB1);    // set direction on 
+}
+
+
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// Timer1
+//
+
+volatile uint8_t tmr1_state        = 0;    
+volatile uint8_t tmr1_coarse_cur   = 0;
+static   uint8_t tmr1_init_fl      = 0;
+
+void tmr1_reset()
+{
+  if( ctl_regs[kTmr1_Coarse_idx] > 0 )
+  {
+    tmr1_state = 1;
+    OCR1C     = 254;
+  }
+  else
+  {
+    tmr1_state = 2;
+    OCR1C     = ctl_regs[kTmr1_Fine_idx];
+  }
+  
+  tmr1_coarse_cur = 0;  
+}
+
+ISR(TIMER1_OVF_vect)
+{
+  if( !tmr1_init_fl )
+  {
+    PORTB |= _BV(PINB3);  // set PWM pin
+  }
+  else
+  {
+    switch( tmr1_state )
+    {
     
-  DDRB |= _BV(DDB1);    
+      case 0:
+        // disabled
+        break;
+
+      case 1:
+        // coarse mode
+        if( ++tmr1_coarse_cur >= ctl_regs[kTmr1_Coarse_idx] )
+        {
+          tmr1_state  = 2;
+          OCR1C     = ctl_regs[kTmr1_Fine_idx];        
+        }
+        break;
+
+      case 2:
+        // fine mode
+        PINB = _BV(PINB4);  // writes to PINB toggle the pins
+
+        tmr1_reset();
+        break;
+    }
+  } 
 }
 
+void timer1_init()
+{
+  TIMSK  &= ~_BV(TOIE1);    // Disable interrupt TIMER1_OVF
+  OCR1A   = 255;            // Set to anything greater than OCR1C (the counter never gets here.)
+  TCCR1  |= _BV(CTC1);      // Reset TCNT1 to 0 when TCNT1==OCR1C 
+  TCCR1  |= _BV(PWM1A);     // Enable PWM A (to generate overflow interrupts)
+  TCCR1  |= ctl_regs[kCS13_10_idx] & 0x0f;  // 
+  GTCCR  |= _BV(PSR1);      // Set the pre-scaler to the selected value
+
+  tmr1_reset();
+  tmr1_init_fl = 1;
+  TIMSK  |= _BV(TOIE1);     // Enable interrupt TIMER1_OVF  
+}
 
-/**
- * This is called for each read request we receive, never put more
- * than one byte of data (with TinyWireS.send) to the send-buffer when
- * using this callback
- */
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//
+// PWM1
+//
+// PWM is optimized to use pins OC1A ,~OC1A, OC1B, ~OC1B but this code
+// but since these pins are not available this code uses
+// ISR's to redirect the output to PIN3
+
+void pwm1_update()
+{
+  OCR1B   = ctl_regs[kPWM1_Duty_idx]; // control duty cycle
+  OCR1C   = ctl_regs[kPWM1_Freq_idx]; // PWM frequency pre-scaler
+}
+
+ISR(TIMER1_COMPB_vect)
+{
+  PORTB &= ~(_BV(PINB3)); // clear PWM pin
+}
+
+
+void pwm1_init()
+{
+  TIMSK  &= ~(_BV(OCIE1B) + _BV(TOIE1));    // Disable interrupts
+  
+  DDRB   |=  _BV(DDB3);  // setup PB3 as output  
+
+  // set on TCNT1 == 0     // happens when TCNT1 matches OCR1C
+  // clr on OCR1B == TCNT  // happens when TCNT1 matches OCR1B
+  //                       // COM1B1=1 COM1B0=0 (enable output on ~OC1B)
+  TCCR1  |= 9;             // 32us period (256 divider) prescaler
+  GTCCR  |= _BV(PWM1B);    // Enable PWM B and disconnect output pins
+  GTCCR  |= _BV(PSR1);     // Set the pre-scaler to the selected value
+
+  pwm1_update();
+
+  TIMSK  |= _BV(OCIE1B) + _BV(TOIE1);    // Enable interrupts
+
+
+  
+}
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+
+// Tracks the current register pointer position
+volatile uint8_t reg_position = 0;
+const uint8_t    reg_size = sizeof(ctl_regs);
+
+//
+// Read Request Handler
+//
+// This is called for each read request we receive, never put more
+// than one byte of data (with TinyWireS.send) to the send-buffer when
+// using this callback
+//
 void on_request()
 {
-  // read and transmit the requestd position
-  usiTwiTransmitByte(ctl_regs[reg_position]);
+  uint8_t val = 0;
+  
+  switch( reg_position )
+  {
+    case kTable_Coarse_idx:
+      val = table[ ctl_regs[kTable_Addr_idx]*2 + 0 ];      
+      break;
+
+    case kTable_Fine_idx:
+      val = table[ ctl_regs[kTable_Addr_idx]*2 + 1 ];
+      break;
+      
+    default:
+      // read and transmit the requestd position
+      val = ctl_regs[reg_position];
 
+  }
+  
+  usiTwiTransmitByte(val);
   
   // Increment the reg position on each read, and loop back to zero
   reg_position++;
@@ -135,14 +421,14 @@ void on_request()
 }
 
 
-/**
- * The I2C data received -handler
- *
- * This needs to complete before the next incoming transaction (start,
- * data, restart/stop) on the bus does so be quick, set flags for long
- * running tasks to be called from the mainloop instead of running
- * them directly,
- */
+//
+// The I2C data received -handler
+//
+// This needs to complete before the next incoming transaction (start,
+// data, restart/stop) on the bus does so be quick, set flags for long
+// running tasks to be called from the mainloop instead of running
+// them directly,
+//
 
 void on_receive( uint8_t byteN )
 {
@@ -174,21 +460,45 @@ void on_receive( uint8_t byteN )
     // pointer is now pointing to the first byte to write to
     while(byteN--)
     {
-        ctl_regs[reg_position] = usiTwiReceiveByte();
-
-        if( kCS13_10_idx <= reg_position && reg_position <= kTmr0_Fine_idx )
-          timer1_init();
+      // write the value
+      ctl_regs[reg_position] = usiTwiReceiveByte();
+
+      // Set timer 1
+      if( kTmr0_Prescale_idx <= reg_position && reg_position <= kTmr0_Fine_idx )
+      { timer0_init(); }
+      else
+
+          
+        // Set PWM 0
+        if( kPWM0_Duty_idx <= reg_position && reg_position <= kPWM0_Freq_idx )
+        { pwm0_update(); }
         else
-          if( kPWM_Duty_idx <= reg_position && reg_position <= kPWM_Freq_idx )
-            pwm0_update();
+        
+          // Set timer 1
+          if( kCS13_10_idx <= reg_position && reg_position <= kTmr1_Fine_idx )
+          { timer1_init(); }
+          else
+
+            // Set PWM 1
+            if( kPWM1_Duty_idx <= reg_position && reg_position <= kPWM1_Freq_idx )
+            { pwm1_update(); }
+            else
+          
+
+              // Write table
+              if( reg_position == kTable_Fine_idx )
+              { table_write_cur_value(); }
+        
+      reg_position++;
+        
+      if (reg_position >= reg_size)
+      {
+        reg_position = 0;
+      }
 
         
-        reg_position++;
-        if (reg_position >= reg_size)
-        {
-            reg_position = 0;
-        }
     }
+
   
 }
 
@@ -197,16 +507,20 @@ void on_receive( uint8_t byteN )
 int main(void)
 {
   cli();        // mask all interupts
-    
-  DDRB  |= _BV(DDB4) + _BV(DDB1);  // setup PB4 as output
-  PORTB &= ~(_BV(PINB4) + _BV(PINB1));
 
-  timer1_init();
-  pwm0_init();
+
+  restore_memory_from_eeprom();
+  
+  DDRB  |=   _BV(DDB4)  + _BV(DDB3)  + _BV(DDB1);  // setup PB4,PB3,PB1 as output  
+  PORTB &= ~(_BV(PINB4) + _BV(PINB3) + _BV(PINB1)); // clear output pins
+
+  
+  timer0_init();
+  pwm1_init();
   
   // setup i2c library
-  usi_onReceiverPtr = on_receive; //on_receive;
-  usi_onRequestPtr = on_request;
+  usi_onReceiverPtr = on_receive; 
+  usi_onRequestPtr  = on_request;
   usiTwiSlaveInit(I2C_SLAVE_ADDRESS);
   
   sei();