diff options
Diffstat (limited to 'utility/iap.c')
| -rw-r--r-- | utility/iap.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/utility/iap.c b/utility/iap.c new file mode 100644 index 0000000..a17ae9e --- /dev/null +++ b/utility/iap.c @@ -0,0 +1,98 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+/*
+ Title: IAP implementation
+
+ About: Purpose
+ IAP feature is avalaible on ATMEL chip with internal FLASH. This allows
+ the FLASH memory to be programmed even when the code is also running in
+ FLASH, without writing some SRAM relocated functions.
+ The IAP function entry point is written in the 3rd exception vector
+ (SWI at 0x300008), and is retrieved just by reading the value at this
+ address.
+
+ ROM function algorithm :
+ // Send Command
+ AT91_BASE_MC->MC_FCR = FlashCmd
+ // Wait Flash is ready
+ while ((AT91C_BASE_MC->MC_FSR & AT91C_MC_FRDY) != AT91C_MC_FRDY)
+ return
+*/
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "iap.h"
+#include <board.h>
+#include <utility/trace.h>
+
+//------------------------------------------------------------------------------
+// Internal variables
+//------------------------------------------------------------------------------
+
+
+
+//------------------------------------------------------------------------------
+// Exported functions
+//------------------------------------------------------------------------------
+/*
+ Function: IAP_PerformCmd
+ Perform a FLASH command through the IAP function.
+
+ Returns:
+ 0 if the IAP function has executed correctly.
+ -1 if the IAP feature is not implemented in the ROM code.
+*/
+unsigned long IAP_PerformCmd(unsigned long FlashCmd)
+{
+ // Pointer on IAP function in ROM
+ static void (*IAP_Function)(unsigned int) = 0;
+
+ if (IAP_Function == 0) {
+
+ IAP_Function = (void (*)(unsigned int)) (*((unsigned int *) IAP_FUNC_ADDR));
+ TRACE_DEBUG("IAP_PerformCmd : IAP function address in ROM : 0x%08X\n\r", (unsigned int) IAP_Function);
+
+ /* Check if IAP function is implemented (opcode in SWI != 'b' or 'ldr') */
+ if ((((((unsigned long)IAP_Function >> 24) & 0xFF) == 0xEA) ||
+ (((unsigned long)IAP_Function >> 24) & 0xFF) == 0xE5)) {
+ TRACE_ERROR("IAP_PerformCmd : no IAP function address found in ROM\n\r");
+ IAP_Function = 0;
+ return -1;
+ }
+ }
+
+ /* Perform FLASH command */
+ IAP_Function(FlashCmd);
+
+ return 0;
+}
+
|