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Added provisions to communication protocol for specifying readback size.

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This commit is contained in:
Doug Brown 2012-05-19 22:58:17 -07:00
parent 6f24f97df5
commit 7d1888dab8
2 changed files with 47 additions and 9 deletions
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5
programmer_protocol.h
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@ -60,7 +60,10 @@ typedef enum ProgrammerIdentifyReply
} ProgrammerIdentifyReply;
// ------------------------- READ PROTOCOL -------------------------
// After CommandReplyOK, the programmer will send a chunk of data.
// After CommandReplyOK, the requester will send a 4-byte value containing
// the number of bytes requested to read (should be a multiple of the read
// chunk size of 1024 bytes, though). The programmer will reply with OK or
// error, and if OK, also send a chunk of data.
// The computer will send a reply (see the enum below this one)
// The programmer will then reply to *that* reply (see this enum)
typedef enum ProgrammerReadReply

51
usb_serial/usb_serial.c
View File

@ -12,7 +12,7 @@
#include "../tests/simm_electrical_test.h"
#include "../programmer_protocol.h"
#define CHIP_SIZE (512UL * 1024UL)
#define MAX_CHIP_SIZE (512UL * 1024UL)
#define READ_CHUNK_SIZE_BYTES 1024UL
#define WRITE_CHUNK_SIZE_BYTES 1024UL
#if ((READ_CHUNK_SIZE_BYTES % 4) != 0)
@ -32,6 +32,7 @@ typedef enum ProgrammerCommandState
{
WaitingForCommand = 0,
ReadingByteWaitingForAddress,
ReadingChipsReadLength,
ReadingChips,
ReadingChipsUnableSendError,
WritingChips
@ -41,12 +42,15 @@ static ProgrammerCommandState curCommandState = WaitingForCommand;
// State info for reading/writing
static uint8_t byteAddressReceiveCount = 0;
static uint16_t curReadIndex;
static uint32_t readLength;
static uint8_t readLengthByteIndex;
static int16_t writePosInChunk = -1;
static uint16_t curWriteIndex = 0;
// Private functions
void USBSerial_HandleWaitingForCommandByte(uint8_t byte);
void USBSerial_HandleReadingChipsByte(uint8_t byte);
void USBSerial_HandleReadingChipsReadLengthByte(uint8_t byte);
void USBSerial_SendReadDataChunk(void);
void USBSerial_HandleWritingChipsByte(uint8_t byte);
void USBSerial_ElectricalTest_Fail_Handler(uint8_t index1, uint8_t index2);
@ -74,6 +78,9 @@ void USBSerial_Check(void)
case WaitingForCommand:
USBSerial_HandleWaitingForCommandByte((uint8_t)recvByte);
break;
case ReadingChipsReadLength:
USBSerial_HandleReadingChipsReadLengthByte((uint8_t)recvByte);
break;
case ReadingChips:
USBSerial_HandleReadingChipsByte((uint8_t)recvByte);
break;
@ -133,10 +140,11 @@ void USBSerial_HandleWaitingForCommandByte(uint8_t byte)
break;
// Asked to read all four chips. Set the state, reply with the first chunk
case ReadChips:
curCommandState = ReadingChips;
curCommandState = ReadingChipsReadLength;
curReadIndex = 0;
readLengthByteIndex = 0;
readLength = 0;
SendByte(CommandReplyOK);
USBSerial_SendReadDataChunk();
break;
// Erase the chips and reply OK. (TODO: Sometimes erase might fail)
case EraseChips:
@ -197,7 +205,7 @@ void USBSerial_HandleReadingChipsByte(uint8_t byte)
case ComputerReadOK:
// If they have confirmed the final data chunk, let them know
// that they have finished, and enter command state.
if (curReadIndex >= (CHIP_SIZE / (READ_CHUNK_SIZE_BYTES/4)))
if (curReadIndex >= readLength)
{
SendByte(ProgrammerReadFinished);
curCommandState = WaitingForCommand;
@ -217,6 +225,33 @@ void USBSerial_HandleReadingChipsByte(uint8_t byte)
}
}
// If we're figuring out the length to read, grab it now...
void USBSerial_HandleReadingChipsReadLengthByte(uint8_t byte)
{
// There will be four bytes, so count up until we know the length. If they
// have sent all four bytes, send the first read chunk.
readLength |= (((uint32_t)byte) << (8*readLengthByteIndex));
if (++readLengthByteIndex >= 4)
{
// Ensure it's within limits and a multiple of 1024
if ((readLength > NUM_CHIPS * MAX_CHIP_SIZE) ||
(readLength % READ_CHUNK_SIZE_BYTES) ||
(readLength == 0))
{
SendByte(ProgrammerReadError);
curCommandState = WaitingForCommand;
}
else
{
// Convert the length into the number of chunks we need to send
readLength /= READ_CHUNK_SIZE_BYTES;
curCommandState = ReadingChips;
SendByte(ProgrammerReadOK);
USBSerial_SendReadDataChunk();
}
}
}
// Read the next chunk of data from the SIMM and send it off over the serial.
void USBSerial_SendReadDataChunk(void)
{
@ -226,14 +261,14 @@ void USBSerial_SendReadDataChunk(void)
// with other functions, but I'm not bothering with that for now.
static union
{
uint32_t readChunks[READ_CHUNK_SIZE_BYTES / 4];
uint32_t readChunks[READ_CHUNK_SIZE_BYTES / NUM_CHIPS];
uint8_t readChunkBytes[READ_CHUNK_SIZE_BYTES];
} chunks;
// Read the next chunk of data, send it over USB, and make sure
// we sent it correctly.
ExternalMem_Read(curReadIndex * (READ_CHUNK_SIZE_BYTES/4),
chunks.readChunks, READ_CHUNK_SIZE_BYTES/4);
ExternalMem_Read(curReadIndex * (READ_CHUNK_SIZE_BYTES/NUM_CHIPS),
chunks.readChunks, READ_CHUNK_SIZE_BYTES/NUM_CHIPS);
uint8_t retVal = SendData((const char *)chunks.readChunkBytes,
READ_CHUNK_SIZE_BYTES);
@ -273,7 +308,7 @@ void USBSerial_HandleWritingChipsByte(uint8_t byte)
case ComputerWriteMore:
writePosInChunk = 0;
// Make sure we don't write past the capacity of the chips.
if (curWriteIndex < CHIP_SIZE / (WRITE_CHUNK_SIZE_BYTES/4))
if (curWriteIndex < MAX_CHIP_SIZE / (WRITE_CHUNK_SIZE_BYTES/4))
{
SendByte(ProgrammerWriteOK);
}