Imported Upstream version 3.2.2

[debian/gnuradio] / usrp2 / firmware / lib / eeprom.c

diff --git a/usrp2/firmware/lib/eeprom.c b/usrp2/firmware/lib/eeprom.c
new file mode 100644 (file)
index 0000000..b12ffe0
--- /dev/null
+++ b/usrp2/firmware/lib/eeprom.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2007 Free Software Foundation, Inc.
+ *
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "i2c.h"
+#include "mdelay.h"
+
+static const int EEPROM_PAGESIZE = 16;
+
+bool
+eeprom_write (int i2c_addr, int eeprom_offset, const void *buf, int len)
+{
+  unsigned char cmd[2];
+  const unsigned char *p = (unsigned char *) buf;
+  
+  // The simplest thing that could possibly work:
+  //   all writes are single byte writes.
+  //
+  // We could speed this up using the page write feature,
+  // but we write so infrequently, why bother...
+
+  while (len-- > 0){
+    cmd[0] = eeprom_offset++;
+    cmd[1] = *p++;
+    bool r = i2c_write (i2c_addr, cmd, sizeof (cmd));
+    mdelay (10);       // delay 10ms worst case write time
+    if (!r)
+      return false;
+  }
+  return true;
+}
+
+bool
+eeprom_read (int i2c_addr, int eeprom_offset, void *buf, int len)
+{
+  unsigned char *p = (unsigned char *) buf;
+
+  // We setup a random read by first doing a "zero byte write".
+  // Writes carry an address.  Reads use an implicit address.
+
+  unsigned char cmd[1];
+  cmd[0] = eeprom_offset;
+  if (!i2c_write (i2c_addr, cmd, sizeof (cmd)))
+    return false;
+
+  while (len > 0){
+    // int n = std::min (len, MAX_EP0_PKTSIZE);
+    int n = len;
+    if (!i2c_read (i2c_addr, p, n))
+      return false;
+    len -= n;
+    p += n;
+  }
+  return true;
+}
+