Merge commit 'v3.3.0' into upstream

[debian/gnuradio] / usrp / firmware / lib / i2c-compiler-bug.c

diff --git a/usrp/firmware/lib/i2c-compiler-bug.c b/usrp/firmware/lib/i2c-compiler-bug.c
new file mode 100644 (file)
index 0000000..360b779
--- /dev/null
+++ b/usrp/firmware/lib/i2c-compiler-bug.c
@@ -0,0 +1,129 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "i2c.h"
+#include "fx2regs.h"
+#include <string.h>
+
+
+// issue a stop bus cycle and wait for completion
+
+
+// returns non-zero if successful, else 0
+unsigned char
+i2c_read (unsigned char addr, xdata unsigned char *buf, unsigned char len)
+{
+  volatile unsigned char       junk;
+  
+  if (len == 0)                        // reading zero bytes always works
+    return 1;
+  
+  // memset (buf, 0, len);             // FIXME, remove
+
+  while (I2CS & bmSTOP)                // wait for stop to clear
+    ;
+
+
+  I2CS = bmSTART;
+  I2DAT = (addr << 1) | 1;     // write address and direction (1's the read bit)
+
+  while ((I2CS & bmDONE) == 0)
+    ;
+
+  if ((I2CS & bmBERR) || (I2CS & bmACK) == 0)  // no device answered...
+    goto fail;
+
+  if (len == 1)
+    I2CS |= bmLASTRD;          
+
+  junk = I2DAT;                        // trigger the first read cycle
+
+#if 1
+  while (len != 1){
+    while ((I2CS & bmDONE) == 0)
+      ;
+
+    if (I2CS & bmBERR)
+      goto fail;
+
+    len--;
+    if (len == 1)
+      I2CS |= bmLASTRD;
+    
+    *buf++ = I2DAT;            // get data, trigger another read
+  }
+#endif
+
+  // wait for final byte
+  
+  while ((I2CS & bmDONE) == 0)
+    ;
+  
+  if (I2CS & bmBERR)
+    goto fail;
+
+  I2CS |= bmSTOP;
+  *buf = I2DAT;
+
+  return 1;
+
+ fail:
+  I2CS |= bmSTOP;
+  return 0;
+}
+
+
+
+// returns non-zero if successful, else 0
+unsigned char
+i2c_write (unsigned char addr, xdata const unsigned char *buf, unsigned char len)
+{
+  while (I2CS & bmSTOP)                // wait for stop to clear
+    ;
+
+  I2CS = bmSTART;
+  I2DAT = (addr << 1) | 0;     // write address and direction (0's the write bit)
+
+  while ((I2CS & bmDONE) == 0)
+    ;
+
+  if ((I2CS & bmBERR) || (I2CS & bmACK) == 0)  // no device answered...
+    goto fail;
+
+  while (len > 0){
+    I2DAT = *buf++;
+    len--;
+
+    while ((I2CS & bmDONE) == 0)
+      ;
+
+    if ((I2CS & bmBERR) || (I2CS & bmACK) == 0)        // no device answered...
+      goto fail;
+  }
+
+  I2CS |= bmSTOP;
+  return 1;
+
+ fail:
+  I2CS |= bmSTOP;
+  return 0;
+}