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| author | Dean Camera <dean@fourwalledcubicle.com> | 2009-12-14 02:59:34 +0000 |
|---|---|---|
| committer | Dean Camera <dean@fourwalledcubicle.com> | 2009-12-14 02:59:34 +0000 |
| commit | 1fa27139f5c195c0d7147dac0c5332a6ea10229a (patch) | |
| tree | 9cb1450d78252d7360fd87c0f28db9cabe85782c /Projects/AVRISP/Lib/NVMTarget.c | |
| parent | 66482341573c035e4c90cee32b89fb7f59068e40 (diff) | |
| download | lufa-1fa27139f5c195c0d7147dac0c5332a6ea10229a.tar.gz lufa-1fa27139f5c195c0d7147dac0c5332a6ea10229a.tar.bz2 lufa-1fa27139f5c195c0d7147dac0c5332a6ea10229a.zip | |
Split out NVM access code in the AVRISP project into a seperate NVMTarget.c source file and header. Make NVM register accesses use the NVM base address as set by the host, rather than using the fixed value from the XMEGA datasheet.
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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