Changes so this checkout exactly matches CVS at -r release_tinyos_2_0_2_2.

[tinyos-2.x.git] / tos / lib / TOSBoot / at45db / ExtFlashC.nc

diff --git a/tos/lib/TOSBoot/at45db/ExtFlashC.nc b/tos/lib/TOSBoot/at45db/ExtFlashC.nc
new file mode 100644 (file)
index 0000000..1d5d3c8
--- /dev/null
+++ b/tos/lib/TOSBoot/at45db/ExtFlashC.nc
@@ -0,0 +1,126 @@
+// $Id$
+
+/*                                                                     tab:2
+ *
+ *
+ * "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>
+ */
+
+module ExtFlashC {
+  provides {
+    interface Init;
+    interface StdControl;
+    interface ExtFlash;
+  }
+}
+
+implementation {
+
+  uint32_t addr;
+
+  command error_t Init.init() {
+    TOSH_MAKE_FLASH_CS_OUTPUT();
+    TOSH_SET_FLASH_CS_PIN();
+    TOSH_MAKE_FLASH_CLK_OUTPUT();
+    TOSH_CLR_FLASH_CLK_PIN();
+    TOSH_MAKE_FLASH_OUT_OUTPUT();      
+    TOSH_SET_FLASH_OUT_PIN();
+    TOSH_MAKE_FLASH_IN_INPUT();
+    TOSH_CLR_FLASH_IN_PIN();
+    return SUCCESS; 
+  }
+
+  command error_t StdControl.start() { return SUCCESS; }
+  command error_t StdControl.stop() { return SUCCESS; }
+
+  uint8_t SPIByte(uint8_t out) {
+
+    uint8_t in = 0;
+    uint8_t i;
+
+    for ( i = 0; i < 8; i++, out <<= 1 ) {
+
+      // write bit
+      if (out & 0x80)
+       TOSH_SET_FLASH_OUT_PIN();
+      else
+       TOSH_CLR_FLASH_OUT_PIN();
+
+      // clock
+      TOSH_SET_FLASH_CLK_PIN();
+
+      // read bit
+      in <<= 1;
+      if (TOSH_READ_FLASH_IN_PIN())
+       in |= 1;
+
+      // clock
+      TOSH_CLR_FLASH_CLK_PIN();
+
+    }
+
+    return in;
+
+  }
+
+  command void ExtFlash.startRead(uint32_t newAddr) {
+
+    uint8_t  cmdBuf[4];
+    uint8_t  i;
+
+    addr = newAddr;
+
+    cmdBuf[0] = 0x68;
+    cmdBuf[1] = (addr >> 15) & 0xff;
+    cmdBuf[2] = (addr >> 7) & 0xfe;
+    cmdBuf[3] = addr & 0xff;
+    
+    TOSH_CLR_FLASH_CLK_PIN();
+    TOSH_CLR_FLASH_CS_PIN();
+    
+    for(i = 0; i < 4; i++)
+      SPIByte(cmdBuf[i]);
+    for(i = 0; i < 4; i++)
+      SPIByte(0x0);
+    
+    TOSH_SET_FLASH_CLK_PIN();
+    TOSH_CLR_FLASH_CLK_PIN();
+
+  }
+
+  command uint8_t ExtFlash.readByte() {
+    if (!(addr & 0xff)) {
+      call ExtFlash.stopRead();
+      call ExtFlash.startRead(addr);
+    }
+    addr++;
+    return SPIByte(0);
+  }
+
+  command void ExtFlash.stopRead() {
+    TOSH_SET_FLASH_CS_PIN();
+  }
+
+}