From f59d1d473627b9ce1226cf1da5c141c2cf1bf37c Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Fri, 21 Jun 2013 22:17:16 +0200
Subject: [PATCH] Revert "go back to hardware packet handling"

This reverts commit 222456d4edba28dede43232231fee62df2a45880.

I could reproduce the problem which lead me to activate hw packet
handling with activated hw packet handling, so the old solution is
better.
---
 culfw/culfw-asksin-fix.diff | 115 +++++++++++++++++++++++++++++++-----
 1 file changed, 99 insertions(+), 16 deletions(-)

diff --git a/culfw/culfw-asksin-fix.diff b/culfw/culfw-asksin-fix.diff
index 168ad47..3887a57 100644
--- a/culfw/culfw-asksin-fix.diff
+++ b/culfw/culfw-asksin-fix.diff
@@ -2,8 +2,13 @@ Index: clib/rf_asksin.c
 ===================================================================
 --- clib/rf_asksin.c	(revision 373)
 +++ clib/rf_asksin.c	(working copy)
-@@ -11,8 +11,8 @@
+@@ -9,15 +9,18 @@
  
+ #include "rf_asksin.h"
+ 
++//we receive a new byte approximately every 8 ms...
++#define RX_TIMEOUT_MS 10
++
  uint8_t asksin_on = 0;
  
 -const uint8_t PROGMEM ASKSIN_CFG[50] = {
@@ -13,12 +18,18 @@ Index: clib/rf_asksin.c
       0x02, 0x2e,
       0x03, 0x0d,
       0x04, 0xE9,
-@@ -26,18 +26,21 @@
+      0x05, 0xCA,
+-     0x07, 0x0C,
++     0x07, 0x04,
+      0x0B, 0x06,
+      0x0D, 0x21,
+      0x0E, 0x65,
+@@ -26,18 +29,22 @@
       0x11, 0x93,
       0x12, 0x03,
       0x15, 0x34,
 -     0x17, 0x30, // always go into IDLE
-+     0x17, 0x33, // go into RX after TX, CCA; ELV uses 0x03
++     0x17, 0x3F, // always go into RX, CCA; ELV uses 0x03
       0x18, 0x18,
       0x19, 0x16,
       0x1B, 0x43,
@@ -33,12 +44,13 @@ Index: clib/rf_asksin.c
 +     0x3e, 0xc3
  };
  
++static inline uint8_t read_cc1100_rxbytes(void);
 +static void rf_asksin_reset_rx(void);
 +
  void
  rf_asksin_init(void)
  {
-@@ -56,20 +59,27 @@
+@@ -56,20 +63,44 @@
    my_delay_us(100);
  
    // load configuration
@@ -60,24 +72,64 @@ Index: clib/rf_asksin.c
 +  ccRX();
  }
  
++// Workaround for CC1101 Errata 3
++static inline uint8_t
++read_cc1100_rxbytes(void)
++{
++  uint8_t rxbytes, rxbytes2;
++  
++  rxbytes = cc1100_readReg(CC1100_RXBYTES);
++  while((rxbytes2 = cc1100_readReg(CC1100_RXBYTES)) != rxbytes)
++    rxbytes = rxbytes2;
++
++  return rxbytes;
++}
++
 +static void
 +rf_asksin_reset_rx(void)
 +{
 +  ccStrobe( CC1100_SFRX  );
 +  ccStrobe( CC1100_SIDLE );
 +  ccStrobe( CC1100_SNOP  );
++
++  while (read_cc1100_rxbytes() & 0x7f)
++    cc1100_readReg(CC1100_RXFIFO);
++
 +  ccStrobe( CC1100_SRX   );
 +}
 +
  void
  rf_asksin_task(void)
  {
-@@ -83,12 +93,14 @@
+@@ -77,18 +108,57 @@
+   uint8_t dec[MAX_ASKSIN_MSG];
+   uint8_t rssi;
+   uint8_t l;
++  uint8_t rxfifo_cnt;
++  uint16_t timeout;
  
-   // see if a CRC OK pkt has been arrived
-   if (bit_is_set( CC1100_IN_PORT, CC1100_IN_PIN )) {
--
+   if(!asksin_on)
+     return;
+ 
+-  // see if a CRC OK pkt has been arrived
+-  if (bit_is_set( CC1100_IN_PORT, CC1100_IN_PIN )) {
++  // see if there is data to be read
++  while (bit_is_set( CC1100_IN_PORT, CC1100_IN_PIN )) {
++    rxfifo_cnt = read_cc1100_rxbytes();
+ 
++    if (rxfifo_cnt & 0x80) // Overflow
++      break;
++
++    rxfifo_cnt &= 0x7f;
++
++    // We must not read the last byte from the RX fifo while RX is in progress (Errata 1)
++    while ((rxfifo_cnt == 1) && (cc1100_readReg(CC1100_PKTSTATUS) & (1 << 3))) {
++      my_delay_ms(1);
++      rxfifo_cnt = read_cc1100_rxbytes() & 0x7f;
++    }
++
      enc[0] = cc1100_readReg( CC1100_RXFIFO ) & 0x7f; // read len
++    rxfifo_cnt--;
  
 -    if (enc[0]>=MAX_ASKSIN_MSG)
 -         enc[0] = MAX_ASKSIN_MSG-1;
@@ -87,26 +139,57 @@ Index: clib/rf_asksin.c
 +      rf_asksin_reset_rx();
 +      return;
 +    }
++
++    if ((enc[0] + 2) > rxfifo_cnt) {
++      timeout = RX_TIMEOUT_MS * ((enc[0] + 2) - rxfifo_cnt);
++      while (timeout-- && ((enc[0] + 2) > rxfifo_cnt)) { // Wait for more data
++        my_delay_ms(1);
++        rxfifo_cnt = read_cc1100_rxbytes();
++
++        if (rxfifo_cnt & 0x80) { // Overflow
++          rf_asksin_reset_rx();
++          return;
++	}
++ 
++        rxfifo_cnt &= 0x7f;
++      }
++
++      if (!timeout) {
++        // Not enough data received, out of sync?
++        rf_asksin_reset_rx();
++        return;
++      }
++    }
 +
      CC1100_ASSERT;
      cc1100_sendbyte( CC1100_READ_BURST | CC1100_RXFIFO );
      
-@@ -97,12 +109,10 @@
+@@ -97,14 +167,19 @@
      }
      
      rssi = cc1100_sendbyte( 0 );
 -    
-+    l = cc1100_sendbyte( 0 );
 +
      CC1100_DEASSERT;
  
 -    ccStrobe( CC1100_SFRX  );
 -    ccStrobe( CC1100_SIDLE );
 -    ccStrobe( CC1100_SNOP  );
-     ccStrobe( CC1100_SRX   );
+-    ccStrobe( CC1100_SRX   );
++    // We must not read the last byte from the RX fifo while RX is in progress (Errata 1)
++    while (((read_cc1100_rxbytes() & 0x7f) == 1) && (cc1100_readReg(CC1100_PKTSTATUS) & (1 << 3))) {
++      my_delay_ms(1);
++    }
  
++    l = cc1100_readReg(CC1100_RXFIFO);
++
++    if (!(l & 0x80)) // CRC not ok
++      continue;
++
      dec[0] = enc[0];
-@@ -113,7 +123,6 @@
+     dec[1] = (~enc[1]) ^ 0x89;
+     
+@@ -113,7 +188,6 @@
      
      dec[l] = enc[l] ^ dec[2];
      
@@ -114,7 +197,7 @@ Index: clib/rf_asksin.c
      if (tx_report & REP_BINTIME) {
        
        DC('a');
-@@ -131,26 +140,17 @@
+@@ -131,26 +205,17 @@
        
        DNL();
      }
@@ -150,7 +233,7 @@ Index: clib/rf_asksin.c
  }
  
  void
-@@ -173,20 +173,7 @@
+@@ -173,20 +238,7 @@
      my_delay_ms(3);             // 3ms: Found by trial and error
    }
  
@@ -171,7 +254,7 @@ Index: clib/rf_asksin.c
    enc[0] = dec[0];
    enc[1] = (~dec[1]) ^ 0x89;
  
-@@ -195,6 +182,15 @@
+@@ -195,6 +247,15 @@
    
    enc[l] = dec[l] ^ dec[2];
  
@@ -187,7 +270,7 @@ Index: clib/rf_asksin.c
    // send
    CC1100_ASSERT;
    cc1100_sendbyte(CC1100_WRITE_BURST | CC1100_TXFIFO);
-@@ -205,12 +201,17 @@
+@@ -205,12 +266,17 @@
  
    CC1100_DEASSERT;
  
-- 
2.39.5