Merge TinyOS 2.1.1 into master.

[tinyos-2.x.git] / tos / lib / tosboot / epic / ExtFlashP.nc

diff --git a/tos/lib/tosboot/epic/ExtFlashP.nc b/tos/lib/tosboot/epic/ExtFlashP.nc
new file mode 100644 (file)
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+++ b/tos/lib/tosboot/epic/ExtFlashP.nc
@@ -0,0 +1,98 @@
+// $Id$
+
+/*
+ * "Copyright (c) 2000-2005 The Regents of the University  of California.  
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
+ * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
+ */
+
+/**
+ * @author Jonathan Hui <jwhui@cs.berkeley.edu>
+ * @author Razvan Musaloiu-E. <razvanm@cs.jhu.edu>
+ */
+
+module ExtFlashP {
+  provides {
+    interface StdControl;
+    interface Init;
+    interface ExtFlash;
+  }
+  uses {
+    interface HplUsartControl as UsartControl;
+  }
+}
+
+implementation {
+
+  uint32_t addr;
+
+  command error_t Init.init() {
+    TOSH_MAKE_FLASH_CS_OUTPUT();
+    TOSH_SET_FLASH_CS_PIN();
+    call UsartControl.setModeSPI();
+    return SUCCESS;
+  }
+
+  command error_t StdControl.start() { 
+    return SUCCESS; 
+  }
+
+  command error_t StdControl.stop() { 
+    call UsartControl.disableSPI();
+    return SUCCESS; 
+  }
+
+  command void ExtFlash.startRead(uint32_t newAddr) {
+
+    uint8_t cmd[4];
+    uint8_t i;
+    uint32_t page = newAddr / 512;
+    uint32_t offset = newAddr % 512;
+
+    addr = newAddr;
+
+    cmd[0] = 0x03;
+    cmd[1] = page >> 6;
+    cmd[2] = (page << 2) | (offset >> 8);
+    cmd[3] = offset;
+
+    TOSH_CLR_FLASH_CS_PIN();
+
+    for ( i = 0; i < sizeof(cmd); i++ ) {
+      call UsartControl.tx(cmd[i]);
+      while(call UsartControl.isTxEmpty() != SUCCESS);
+    }
+  }
+
+  command uint8_t ExtFlash.readByte() {
+    if (!(addr & 0x1ff)) {
+      call ExtFlash.stopRead();
+      call ExtFlash.startRead(addr);
+    }
+    addr++;
+    call UsartControl.rx();
+    call UsartControl.tx(0);
+    while(call UsartControl.isRxIntrPending() != SUCCESS);
+    return call UsartControl.rx();
+  }
+
+  command void ExtFlash.stopRead() {
+    TOSH_SET_FLASH_CS_PIN();
+  }
+
+}