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Clean up and add more comments to the AVRISP-MKII project. Make sure the SPI_MULTI command handler supports multiple packet responses. Use slightly smaller/faster repeated indirect-load commands when retrieving the PDI target's memory CRCs.

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This commit is contained in:
Dean Camera 2010-01-17 04:39:33 +00:00
parent b0ce1eab66
commit f3d370a777
10 changed files with 87 additions and 47 deletions
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24
Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
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@ -136,24 +136,18 @@ bool XMEGANVM_GetMemoryCRC(const uint8_t CRCCommand, uint32_t* const CRCDest)
if (!(XMEGANVM_WaitWhileNVMControllerBusy()))
return false;
uint32_t MemoryCRC = 0;
/* Read the first generated CRC byte value */
XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
/* Load the PDI pointer register with the DAT0 register start address */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_DAT0);
MemoryCRC = XPROGTarget_ReceiveByte();
/* Read the second generated CRC byte value */
XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_DAT1);
MemoryCRC |= ((uint16_t)XPROGTarget_ReceiveByte() << 8);
/* Read the third generated CRC byte value */
XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_DAT2);
MemoryCRC |= ((uint32_t)XPROGTarget_ReceiveByte() << 16);
/* Send the REPEAT command to grab the CRC bytes */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(XMEGA_CRC_LENGTH - 1);
*CRCDest = MemoryCRC;
/* Read in the CRC bytes from the target */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
for (uint8_t i = 0; i < XMEGA_CRC_LENGTH; i++)
((uint8_t*)CRCDest)[i] = XPROGTarget_ReceiveByte();
return true;
}