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scroller correction + JPEG improvements

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This commit is contained in:
philippe44
2020-02-27 23:05:04 -08:00
parent 876ae491a1
commit 7584b1bd5b
7 changed files with 71 additions and 43 deletions
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21
components/display/SSD1306.c
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@@ -21,6 +21,10 @@
static char TAG[] = "SSD1306";
struct SSD1306_Private {
uint8_t *Shadowbuffer;
};
// Functions are not deckared to minimize # of lines
static void SetColumnAddress( struct GDS_Device* Device, uint8_t Start, uint8_t End ) {
@@ -36,9 +40,10 @@ static void SetPageAddress( struct GDS_Device* Device, uint8_t Start, uint8_t En
static void Update( struct GDS_Device* Device ) {
#ifdef SHADOW_BUFFER
struct SSD1306_Private *Private = (struct SSD1306_Private*) Device->Private;
// not sure the compiler does not have to redo all calculation in for loops, so local it is
int width = Device->Width, rows = Device->Height / 8;
uint8_t *optr = Device->Shadowbuffer, *iptr = Device->Framebuffer;
uint8_t *optr = Private->Shadowbuffer, *iptr = Device->Framebuffer;
int CurrentRow = -1, FirstCol = -1, LastCol = -1;
// by row, find first and last columns that have been updated
@@ -54,7 +59,6 @@ static void Update( struct GDS_Device* Device ) {
// now update the display by "byte rows"
if (first--) {
// only set column when useful, saves a fair bit of CPU
if (first > FirstCol && first <= FirstCol + 4 && last < LastCol && last >= LastCol - 4) {
first = FirstCol;
@@ -70,7 +74,7 @@ static void Update( struct GDS_Device* Device ) {
CurrentRow = r + 1;
// actual write
Device->WriteData( Device, Device->Shadowbuffer + r*width + first, last - first + 1);
Device->WriteData( Device, Private->Shadowbuffer + r*width + first, last - first + 1);
}
}
#else
@@ -94,17 +98,18 @@ static void SetContrast( struct GDS_Device* Device, uint8_t Contrast ) {
static bool Init( struct GDS_Device* Device ) {
Device->FramebufferSize = ( Device->Width * Device->Height ) / 8;
// benchmarks showed little gain to have SPI memory already in IRAL vs letting driver copy
// benchmarks showed little gain to have SPI memory already in IRAL vs letting driver copy
#ifdef SHADOW_BUFFER
struct SSD1306_Private *Private = (struct SSD1306_Private*) Device->Private;
Device->Framebuffer = calloc( 1, Device->FramebufferSize );
NullCheck( Device->Framebuffer, return false );
#ifdef USE_IRAM
if (Device->IF == IF_SPI) Device->Shadowbuffer = heap_caps_malloc( Device->FramebufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA );
if (Device->IF == IF_SPI) Private->Shadowbuffer = heap_caps_malloc( Device->FramebufferSize, MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA );
else
#endif
Device->Shadowbuffer = malloc( Device->FramebufferSize );
NullCheck( Device->Shadowbuffer, return false );
memset(Device->Shadowbuffer, 0xFF, Device->FramebufferSize);
Private->Shadowbuffer = malloc( Device->FramebufferSize );
NullCheck( Private->Shadowbuffer, return false );
memset(Private->Shadowbuffer, 0xFF, Device->FramebufferSize);
#else // not SHADOW_BUFFER
#ifdef USE_IRAM
// benchmarks showed little gain to have SPI memory already in IRAL vs letting driver copy