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Reduced stack usage in showBootLogoIfavailable().

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Introduced new function OLED::drawAreaSwapped() for drawing images where
the octets are reveresed endianess in 16-bit words.
This commit is contained in:
fatcookies
2020-01-16 21:58:02 +00:00
parent 1ca87a4241
commit 0591a01c5a
3 changed files with 52 additions and 22 deletions
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2
workspace/TS100/Core/Inc/OLED.hpp
View File

@@ -92,6 +92,8 @@ public:
static void drawSymbol(uint8_t symbolID);//Used for drawing symbols of a predictable width
static void drawArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t* ptr); //Draw an area, but y must be aligned on 0/8 offset
static void drawAreaSwapped(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t* ptr); //Draw an area, but y must be aligned on 0/8 offset
static void fillArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t value); //Fill an area, but y must be aligned on 0/8 offset
static void drawFilledRect(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1,

38
workspace/TS100/Core/Src/OLED.cpp
View File

@@ -262,6 +262,44 @@ void OLED::drawArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
}
}
}
// Draw an area, but y must be aligned on 0/8 offset
// For data which has octets swapped in a 16-bit word.
void OLED::drawAreaSwapped(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t *ptr) {
// Splat this from x->x+wide in two strides
if (x <= -wide)
return; // cutoffleft
if (x > 96)
return; // cutoff right
uint8_t visibleStart = 0;
uint8_t visibleEnd = wide;
// trimming to draw partials
if (x < 0) {
visibleStart -= x; // subtract negative value == add absolute value
}
if (x + wide > 96) {
visibleEnd = 96 - x;
}
if (y == 0) {
// Splat first line of data
for (uint8_t xx = visibleStart; xx < visibleEnd; xx+=2) {
firstStripPtr[xx + x] = ptr[xx + 1];
firstStripPtr[xx + x + 1] = ptr[xx];
}
}
if (y == 8 || height == 16) {
// Splat the second line
for (uint8_t xx = visibleStart; xx < visibleEnd; xx+=2) {
secondStripPtr[x + xx] = ptr[xx + 1 + (height == 16 ? wide : 0)];
secondStripPtr[x + xx + 1] = ptr[xx + (height == 16 ? wide : 0)];
}
}
}
void OLED::fillArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
const uint8_t value) {
// Splat this from x->x+wide in two strides

34
workspace/TS100/Core/Src/main.cpp
View File

@@ -283,31 +283,21 @@ void startMOVTask(void const *argument __unused) {
#define FLASH_LOGOADDR \
(0x8000000 | 0xF800) /*second last page of flash set aside for logo image*/
/* The header value is (0xAA,0x55,0xF0,0x0D) but is stored in little endian 16
* bits words on the flash */
const uint8_t LOGO_HEADER_VALUE[] = {0x55, 0xAA, 0x0D, 0xF0};
bool showBootLogoIfavailable() {
// check if the header is there (0xAA,0x55,0xF0,0x0D)
// If so display logo
// TODO REDUCE STACK ON THIS ONE, USE DRAWING IN THE READ LOOP
uint16_t temp[98];
uint8_t *header = (uint8_t*) (FLASH_LOGOADDR);
for (uint8_t i = 0; i < (98); i++) {
temp[i] = *(uint16_t*) (FLASH_LOGOADDR + (i * 2));
}
uint8_t temp8[98 * 2];
for (uint8_t i = 0; i < 98; i++) {
temp8[i * 2] = temp[i] >> 8;
temp8[i * 2 + 1] = temp[i] & 0xFF;
}
// check if the header is correct.
for(int i = 0; i < 4; i++) {
if(header[i] != LOGO_HEADER_VALUE[i]) {
return false;
}
}
if (temp8[0] != 0xAA)
return false;
if (temp8[1] != 0x55)
return false;
if (temp8[2] != 0xF0)
return false;
if (temp8[3] != 0x0D)
return false;
OLED::drawArea(0, 0, 96, 16, (uint8_t*) (temp8 + 4));
OLED::drawAreaSwapped(0, 0, 96, 16, (uint8_t*) (FLASH_LOGOADDR + 4));
OLED::refresh();
return true;
}