diff options
Diffstat (limited to 'Projects/AVRISP/Lib/NVMTarget.c')
| -rw-r--r-- | Projects/AVRISP/Lib/NVMTarget.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/Projects/AVRISP/Lib/NVMTarget.c b/Projects/AVRISP/Lib/NVMTarget.c new file mode 100644 index 000000000..104d0a8b0 --- /dev/null +++ b/Projects/AVRISP/Lib/NVMTarget.c @@ -0,0 +1,107 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, provided that the above copyright notice appear in all
+ copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Target-related functions for the target's NVM module.
+ */
+
+#define INCLUDE_FROM_NVMTARGET_C
+#include "NVMTarget.h"
+
+#if defined(ENABLE_PDI_PROTOCOL) || defined(__DOXYGEN__)
+
+void NVMTarget_SendNVMRegAddress(uint8_t Register)
+{
+ uint32_t Address = XPROG_Param_NVMBase | Register;
+
+ PDITarget_SendByte(Address >> 24);
+ PDITarget_SendByte(Address >> 26);
+ PDITarget_SendByte(Address >> 8);
+ PDITarget_SendByte(Address & 0xFF);
+}
+
+bool NVMTarget_WaitWhileNVMBusBusy(void)
+{
+ uint8_t AttemptsRemaining = 255;
+
+ /* Poll the STATUS register to check to see if NVM access has been enabled */
+ while (AttemptsRemaining--)
+ {
+ PDITarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);
+ if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
+ return true;
+ }
+
+ return false;
+}
+
+void NVMTarget_WaitWhileNVMControllerBusy(void)
+{
+ /* Poll the NVM STATUS register while the NVM controller is busy */
+ for (;;)
+ {
+ PDITarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_1BYTE << 2));
+ NVMTarget_SendNVMRegAddress(NVM_REG_STATUS);
+
+ if (!(PDITarget_ReceiveByte() & (1 << 7)))
+ return;
+ }
+}
+
+uint32_t NVMTarget_GetMemoryCRC(uint8_t MemoryCommand)
+{
+ uint32_t MemoryCRC;
+
+ /* Set the NVM command to the correct CRC read command */
+ PDITarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_1BYTE << 2));
+ NVMTarget_SendNVMRegAddress(NVM_REG_CMD);
+ PDITarget_SendByte(MemoryCommand);
+
+ /* Set CMDEX bit in NVM CTRLA register to start the CRC generation */
+ PDITarget_SendByte(PDI_CMD_STS | (PDI_DATSIZE_1BYTE << 2));
+ NVMTarget_SendNVMRegAddress(NVM_REG_CTRLA);
+ PDITarget_SendByte(1 << 0);
+
+ /* Wait until the NVM bus and controller is no longer busy */
+ NVMTarget_WaitWhileNVMBusBusy();
+ NVMTarget_WaitWhileNVMControllerBusy();
+
+ /* Read the three byte generated CRC value */
+ PDITarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_3BYTES << 2));
+ NVMTarget_SendNVMRegAddress(NVM_REG_DAT0);
+ MemoryCRC = PDITarget_ReceiveByte();
+ MemoryCRC |= ((uint16_t)PDITarget_ReceiveByte() << 8);
+ MemoryCRC |= ((uint32_t)PDITarget_ReceiveByte() << 16);
+
+ return MemoryCRC;
+}
+
+#endif
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