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Shrink the size of the Printer class bootloader by refactoring the page flush code into a static function.

This commit is contained in:
Dean Camera 2013-05-10 17:48:52 +02:00
parent f9a919aa77
commit 46bb98d9dc
1 changed files with 32 additions and 28 deletions
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60
Bootloaders/Printer/BootloaderPrinter.c
View File

@ -92,17 +92,13 @@ struct
uint32_t CurrBaseAddress;
/** Current 32-bit byte address in FLASH being targeted. */
uint32_t CurrAddress;
} HEXParser =
{
.ParserState = HEX_PARSE_STATE_WAIT_LINE
};
} HEXParser;
/** Indicates if there is data waiting to be written to a physical page of
* memory in FLASH.
*/
static bool PageDirty = false;
/** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
* via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
* started via a forced watchdog reset.
@ -153,6 +149,31 @@ static int8_t HexToDecimal(const char Byte)
return -1;
}
/**
* Flushes a partially written page of data to physical FLASH, if a page
* boundary has been crossed.
*
* \note If a page flush occurs the global HEX parser state is updated.
*/
static void FlushPageIfRequired(void)
{
/* Abort if no data has been buffered for writing to the current page */
if (!PageDirty)
return;
/* Flush the FLASH page to physical memory if we are crossing a page boundary */
uint32_t NewPageStartAddress = (HEXParser.CurrAddress & ~(SPM_PAGESIZE - 1));
if (HEXParser.PageStartAddress != NewPageStartAddress)
{
boot_page_write(HEXParser.PageStartAddress);
boot_spm_busy_wait();
HEXParser.PageStartAddress = NewPageStartAddress;
PageDirty = false;
}
}
/**
* Parses an input Intel HEX formatted stream one character at a time, loading
* the data contents into the device's internal FLASH memory.
@ -241,9 +262,7 @@ static void ParseIntelHEXByte(const char ReadCharacter)
switch (HEXParser.RecordType)
{
case HEX_RECORD_TYPE_Data:
/* If we are writing to a new page, we need to erase it
* first
*/
/* If we are writing to a new page, we need to erase it first */
if (!(PageDirty))
{
boot_page_erase(HEXParser.PageStartAddress);
@ -257,16 +276,7 @@ static void ParseIntelHEXByte(const char ReadCharacter)
HEXParser.CurrAddress += 2;
/* Flush the FLASH page to physical memory if we are crossing a page boundary */
uint32_t NewPageStartAddress = (HEXParser.CurrAddress & ~(SPM_PAGESIZE - 1));
if (PageDirty && (HEXParser.PageStartAddress != NewPageStartAddress))
{
boot_page_write(HEXParser.PageStartAddress);
boot_spm_busy_wait();
HEXParser.PageStartAddress = NewPageStartAddress;
PageDirty = false;
}
FlushPageIfRequired();
break;
case HEX_RECORD_TYPE_ExtendedSegmentAddress:
@ -290,16 +300,7 @@ static void ParseIntelHEXByte(const char ReadCharacter)
break;
/* Flush the FLASH page to physical memory if we are crossing a page boundary */
uint32_t NewPageStartAddress = (HEXParser.CurrAddress & ~(SPM_PAGESIZE - 1));
if (PageDirty && (HEXParser.PageStartAddress != NewPageStartAddress))
{
boot_page_write(HEXParser.PageStartAddress);
boot_spm_busy_wait();
HEXParser.PageStartAddress = NewPageStartAddress;
PageDirty = false;
}
FlushPageIfRequired();
/* If end of the HEX file reached, the bootloader should exit at next opportunity */
if (HEXParser.RecordType == HEX_RECORD_TYPE_EndOfFile)
@ -413,6 +414,9 @@ void EVENT_USB_Device_ConfigurationChanged(void)
/* Setup Printer Data Endpoints */
ConfigSuccess &= PRNT_Device_ConfigureEndpoints(&TextOnly_Printer_Interface);
/* Reset the HEX parser upon successful connection to a host */
HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE;
/* Indicate endpoint configuration success or failure */
LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
}