fleg
/
Arduboy-homemade-package
mirror of https://github.com/MrBlinky/Arduboy-homemade-package.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

ArduboyFX: Add Mr.Blinkys original displayPrefetch 

Add Mr.Blinkys displayPrefetch function that he shared in
the Arduboy forum. This function can send the current buffer
to the OLED while simultaneously reading new data from
flash into the framebuffer.
This commit is contained in:
Michael Gollnick 2022-02-10 11:20:01 +01:00
parent fcf672bb4e
commit 0f3185435d
2 changed files with 49 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
board-package-source/libraries/ArduboyFX/src/ArduboyFX.cpp
View File

@ -695,3 +695,50 @@ uint32_t FX::readIndexedUInt32(uint24_t address, uint8_t index)
seekDataArray(address, index, 0, sizeof(uint24_t));
return readPendingLastUInt32();
}
void FX::displayPrefetch(uint24_t address, uint8_t* target, uint16_t len, bool clear)
{
seekData(address);
asm volatile
( "dbg:\n"
" ldi r30, lo8(%[sbuf]) \n" // uint8_t* ptr = Arduboy2::sBuffer;
" ldi r31, hi8(%[sbuf]) \n"
" ldi r25, hi8(%[end]) \n"
" in r0, %[spsr] \n" // wait(); //for 1st target data recieved (can't enable OLED mid transfer)
" sbrs r0, %[spif] \n"
" rjmp .-6 \n"
" cbi %[csport], %[csbit] \n" // enableOLED();
"1: \n" // while (true) {
" ld r0, Z ;2 \ \n" // uint8_t displaydata = *ptr;
" in r24, %[spdr] ;1 /3 \n" // uint8_t targetdata = SPDR;
" out %[spdr], r0 ;1 \ \n" // SPDR = displaydata;
" cpse %[clear], r1 ;1-2 \n" // if (clear) displaydata = 0;
" mov r0, r1 ;1 \n"
" st Z+, r0 ;2 \n" // *ptr++ = displaydata;
" subi %A[len], 1 ;1 \n" // if (--len >= 0) *target++ = targetdata;
" sbci %B[len], 0 ;1 \n"
" brmi 3f ;1-2 \n" // branch ahead and back to 2 to burn 4 cycles
" nop ;1 \n"
" st %a[target]+, r24 ;2 /11 \n"
"2: \n"
" cpi r30, lo8(%[end]) ;1 \ \n" // if (ptr >= Arduboy2::sBuffer + WIDTH * HEIGHT / 8) break;
" cpc r31, r25 ;1 \n"
" brcs 1b ;1-2/4 \n" // }
"3: \n"
" brmi 2b ;1-2 \n" // branch only when coming from above brmi
: [target] "+e" (target),
[len] "+d" (len)
: [sbuf] "" (Arduboy2::sBuffer),
[end] "" (Arduboy2::sBuffer + WIDTH * HEIGHT / 8),
[clear] "r" (clear),
[spsr] "I" (_SFR_IO_ADDR(SPSR)),
[spif] "I" (SPIF),
[spdr] "I" (_SFR_IO_ADDR(SPDR)),
[csport] "I" (_SFR_IO_ADDR(CS_PORT)),
[csbit] "I" (CS_BIT)
: "r24", "r25", "r30", "r31"
);
disableOLED();
disable();
SPSR;
}

2
board-package-source/libraries/ArduboyFX/src/ArduboyFX.h
View File

@ -125,6 +125,8 @@ class FX
static uint8_t readByte(); //read a single byte from flash memory
static void displayPrefetch(uint24_t address, uint8_t* target, uint16_t len, bool clear);
static void begin(); // Initializes flash memory. Use only when program does not require data and save areas in flash memory
static void begin(uint16_t programDataPage); // Initializes flash memory. Use when program depends on data in flash memory