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More minor speedups to the AVRISP-MKII clone programmer PDI memory reading code.

This commit is contained in:
Dean Camera 2013-10-27 18:26:11 +01:00
parent 13b3014db4
commit e1b19e4e10
1 changed files with 16 additions and 9 deletions
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25
Projects/AVRISP-MKII/Lib/XPROG/XMEGANVM.c
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@ -236,21 +236,28 @@ bool XMEGANVM_ReadMemory(const uint32_t ReadAddress,
XMEGANVM_SendNVMRegAddress(XMEGA_NVM_REG_CMD);
XPROGTarget_SendByte(XMEGA_NVM_CMD_READNVM);
/* Load the PDI pointer register with the start address we want to read from */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
XMEGANVM_SendAddress(ReadAddress);
if (ReadSize > 1)
{
/* Load the PDI pointer register with the start address we want to read from */
XPROGTarget_SendByte(PDI_CMD_ST | (PDI_POINTER_DIRECT << 2) | PDI_DATSIZE_4BYTES);
XMEGANVM_SendAddress(ReadAddress);
/* Send the REPEAT command with the specified number of bytes to read */
XPROGTarget_SendByte(PDI_CMD_REPEAT | PDI_DATSIZE_1BYTE);
XPROGTarget_SendByte(ReadSize - 1);
}
/* Send a LD command with indirect access and post-increment to read out the bytes */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
while (ReadSize-- && TimeoutTicksRemaining)
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
/* Send a LD command with indirect access and post-increment to read out the bytes */
XPROGTarget_SendByte(PDI_CMD_LD | (PDI_POINTER_INDIRECT_PI << 2) | PDI_DATSIZE_1BYTE);
while (ReadSize-- && TimeoutTicksRemaining)
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
}
else
{
/* Send a LDS command with the read address to read out the requested byte */
XPROGTarget_SendByte(PDI_CMD_LDS | (PDI_DATSIZE_4BYTES << 2));
XMEGANVM_SendAddress(ReadAddress);
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
}
return (TimeoutTicksRemaining > 0);
}