STM32LTDC: Rename user config options for consistency & add docs

boards/base/STM32F429i-Discovery/chibios/board_STM32LTDC.h

@@ -23,10 +23,6 @@ static const SPIConfig spi_cfg = {
 	((1 << 3) & SPI_CR1_BR) | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_MSTR
 };
 
-#define LTDC_USE_DMA2D			GFXON
-#define LTDC_USE_2ND_LAYER		GFXON
-#define LTDC_DMA_CACHE_FLUSH	GFXOFF		// This will be turned on automatically on certain systems/platforms
-
 static const ltdcConfig driverCfg = {
 	240, 320,
 	10, 2,
@@ -49,7 +45,7 @@ static const ltdcConfig driverCfg = {
 		0xFF,								// alpha
 		LTDC_LEF_ENABLE						// flags
 	},
-#if LTDC_USE_2ND_LAYER
+#if STM32LTDC_USE_LAYER2
 	{										// Foreground layer config (if turned on)
 		(LLDCOLOR_TYPE *)(SDRAM_BANK_ADDR+(240 * 320 * LTDC_PIXELBYTES)), // Frame buffer address
 		240, 320,							// width, height

boards/base/STM32F439i-Eval/CubeHal/board_STM32LTDC.h

@@ -19,10 +19,6 @@
 #include "stm32f4xx_hal.h"
 #include "stm324x9i_eval_sdram.h"
 
-#define LTDC_USE_DMA2D			GFXON
-#define LTDC_USE_2ND_LAYER		GFXON
-#define LTDC_DMA_CACHE_FLUSH	GFXOFF		// This will be turned on automatically on certain systems/platforms
-
 // Panel parameters
 // This panel is a AMPIRE640480 panel.
 
@@ -50,7 +46,7 @@ static const ltdcConfig driverCfg = {
 		LTDC_LEF_ENABLE						// Layer configuration flags
 	},
 
-#if LTDC_USE_2ND_LAYER
+#if STM32LTDC_USE_LAYER2
 	{										// Foreground layer config (if turned on)
 		(LLDCOLOR_TYPE *)(SDRAM_DEVICE_ADDR+(640 * 480 * LTDC_PIXELBYTES)), // Frame buffer address
 		640, 480,							// Width, Height (pixels)

boards/base/STM32F469i-Discovery/CubeHAL/board_STM32LTDC.h

@@ -8,10 +8,6 @@
 #ifndef _GDISP_LLD_BOARD_H
 #define _GDISP_LLD_BOARD_H
 
-#define LTDC_USE_DMA2D			GFXON
-#define LTDC_USE_2ND_LAYER		GFXON
-#define LTDC_DMA_CACHE_FLUSH	GFXOFF		// This will be turned on automatically on certain systems/platforms
-
 /* Avoid naming collisions with CubeHAL. */
 #if GFX_COMPAT_V2 && GFX_COMPAT_OLDCOLORS
 	#undef Red

boards/base/STM32F746-Discovery/board_STM32LTDC.h

@@ -36,10 +36,6 @@
 	#define AFRH	AFR[1]
 #endif
 
-#define LTDC_USE_DMA2D			GFXON
-#define LTDC_USE_2ND_LAYER		GFXON
-#define LTDC_DMA_CACHE_FLUSH	GFXOFF		// This will be turned on automatically on certain systems/platforms
-
 static const ltdcConfig driverCfg = {
 	480, 272,								// Width, Height (pixels)
 	41, 10,									// Horizontal, Vertical sync (pixels)
@@ -64,7 +60,7 @@ static const ltdcConfig driverCfg = {
 		LTDC_LEF_ENABLE						// Layer configuration flags
 	},
 
-#if LTDC_USE_2ND_LAYER
+#if STM32LTDC_USE_LAYER2
 	{										// Foreground layer config (if turned on)
 		(LLDCOLOR_TYPE *)(SDRAM_DEVICE_ADDR+(480 * 272 * LTDC_PIXELBYTES)), // Frame buffer address
 		480, 272,							// Width, Height (pixels)
@@ -408,7 +404,7 @@ static GFXINLINE void init_ltdc_clock(void)
 	RCC->APB2ENR |= RCC_APB2ENR_LTDCEN;
 }
 
-#if LTDC_USE_DMA2D
+#if STM32LTDC_USE_DMA2D
 	static GFXINLINE void init_dma2d_clock(void)
 	{
 		// Enable DMA2D clock

drivers/gdisp/STM32LTDC/board_STM32LTDC_template.h

@@ -8,10 +8,6 @@
 #ifndef _GDISP_LLD_BOARD_H
 #define _GDISP_LLD_BOARD_H
 
-#define LTDC_USE_DMA2D			GFXON
-#define LTDC_USE_2ND_LAYER		GFXOFF
-#define LTDC_DMA_CACHE_FLUSH	GFXOFF		// This will be turned on automatically on certain systems/platforms
-
 static const ltdcConfig driverCfg = {
 	480, 272,								// Width, Height (pixels)
 	41, 10,									// Horizontal, Vertical sync (pixels)
@@ -36,7 +32,7 @@ static const ltdcConfig driverCfg = {
 		LTDC_LEF_ENABLE						// Layer configuration flags
 	},
 
-#if LTDC_USE_2ND_LAYER
+#if STM32LTDC_USE_LAYER2
 	{										// Foreground layer config (if turned on)
 		(LLDCOLOR_TYPE *)(SDRAM_DEVICE_ADDR+(480 * 272 * LTDC_PIXELBYTES)), // Frame buffer address
 		480, 272,							// Width, Height (pixels)
@@ -62,7 +58,7 @@ static GFXINLINE void init_ltdc_clock(void)
 	// Setup LTDC clock and enable the peripheral
 }
 
-#if LTDC_USE_DMA2D
+#if STM32LTDC_USE_DMA2D
 	static GFXINLINE void init_dma2d_clock(void)
 	{
 		// Setup DMA2D clock and enable the peripheral

drivers/gdisp/STM32LTDC/gdisp_lld_STM32LTDC.c

@@ -13,7 +13,7 @@
 #include "gdisp_lld_config.h"
 #include "../../../src/gdisp/gdisp_driver.h"
 #include "stm32_ltdc.h"
-#if LTDC_USE_DMA2D
+#if STM32LTDC_USE_DMA2D
  	#include "stm32_dma2d.h"
 #endif
 
@@ -27,6 +27,27 @@
 	#undef GDISP_SCREEN_HEIGHT
 #endif
 
+#ifndef	STM32LTDC_DMA_CACHE_FLUSH
+	#define	STM32LTDC_DMA_CACHE_FLUSH	GFXOFF
+#endif
+#ifndef STM32LTDC_USE_DMA2D
+ 	#define STM32LTDC_USE_DMA2D 		GFXOFF
+#endif
+#ifndef STM32LTDC_USE_LAYER2
+	#define	STM32LTDC_USE_LAYER2		GFXOFF
+#endif
+#ifndef STM32LTDC_USE_RGB565
+	#define STM32LTDC_USE_RGB565		GFXOFF
+#endif
+
+// Force DMA cache flushing on certain platforms/systems.
+#if STM32LTDC_USE_DMA2D
+	#if defined(STM32F7) || defined(STM32H7) || defined(STM32F746xx)
+		#undef 	STM32LTDC_DMA_CACHE_FLUSH
+		#define	STM32LTDC_DMA_CACHE_FLUSH	GFXON
+	#endif
+#endif
+
 typedef struct ltdcLayerConfig {
 	// Frame
 	LLDCOLOR_TYPE*	frame;			// Frame buffer address
@@ -75,20 +96,6 @@ typedef struct ltdcConfig {
 
 #include "board_STM32LTDC.h"
 
-#ifndef LTDC_USE_DMA2D
- 	#define LTDC_USE_DMA2D 			GFXOFF
-#endif
-#ifndef	LTDC_DMA_CACHE_FLUSH
-	#define	LTDC_DMA_CACHE_FLUSH	GFXOFF
-#endif
-
-#if LTDC_USE_DMA2D
-	#if defined(STM32F7) || defined(STM32H7) || defined(STM32F746xx)
-		#undef 	LTDC_DMA_CACHE_FLUSH
-		#define	LTDC_DMA_CACHE_FLUSH	GFXON
-	#endif
-#endif
-
 /*===========================================================================*/
 /* Driver local definitions.                                                 */
 /*===========================================================================*/
@@ -226,7 +233,7 @@ LLDSPEC gBool gdisp_lld_init(GDisplay* g) {
 		_ltdc_init();
 
 		// Initialise DMA2D
-		#if LTDC_USE_DMA2D
+		#if STM32LTDC_USE_DMA2D
 			dma2d_init();
 		#endif
 
@@ -297,7 +304,7 @@ LLDSPEC void gdisp_lld_draw_pixel(GDisplay* g) {
 		pos = PIXIL_POS(g, g->p.x, g->p.y);
 	#endif
 
-	#if LTDC_USE_DMA2D
+	#if STM32LTDC_USE_DMA2D
 		while(DMA2D->CR & DMA2D_CR_START);
 	#endif
 
@@ -335,7 +342,7 @@ LLDSPEC	gColor gdisp_lld_get_pixel_color(GDisplay* g) {
 		pos = PIXIL_POS(g, g->p.x, g->p.y);
 	#endif
 
-	#if LTDC_USE_DMA2D
+	#if STM32LTDC_USE_DMA2D
 		while(DMA2D->CR & DMA2D_CR_START);
 	#endif
 
@@ -393,8 +400,8 @@ LLDSPEC	gColor gdisp_lld_get_pixel_color(GDisplay* g) {
 	}
 #endif
 
-#if LTDC_USE_DMA2D
-	#if LTDC_DMA_CACHE_FLUSH
+#if STM32LTDC_USE_DMA2D
+	#if STM32LTDC_DMA_CACHE_FLUSH
 		#if defined(__CC_ARM)
 			#define __ugfxDSB()		__dsb(0xF)
 		#else		// GCC like
@@ -459,7 +466,7 @@ LLDSPEC	gColor gdisp_lld_get_pixel_color(GDisplay* g) {
 			shape = (g->p.cx << 16) | (g->p.cy);
 		#endif
 
-		#if LTDC_DMA_CACHE_FLUSH
+		#if STM32LTDC_DMA_CACHE_FLUSH
 		{
 			// This is slightly less than optimal as we flush the whole line in the source and destination image
 			// instead of just the cx portion but this saves us having to iterate over each line.
@@ -524,7 +531,7 @@ LLDSPEC	gColor gdisp_lld_get_pixel_color(GDisplay* g) {
 			srcstart = LTDC_PIXELBYTES * ((gU32)g->p.x2 * g->p.y1 * + g->p.x1) + (gU32)g->p.ptr;
 			dststart = (gU32)PIXEL_ADDR(g, PIXIL_POS(g, g->p.x, g->p.y));
 
-			#if LTDC_DMA_CACHE_FLUSH
+			#if STM32LTDC_DMA_CACHE_FLUSH
 			{
 				// This is slightly less than optimal as we flush the whole line in the source and destination image
 				// instead of just the cx portion but this saves us having to iterate over each line.

drivers/gdisp/STM32LTDC/gdisp_lld_config.h

@@ -14,7 +14,6 @@
 /* Driver hardware support.                                                  */
 /*===========================================================================*/
 
-#define	LTDC_USE_DMA2D						GFXON
 #define GDISP_HARDWARE_DRAWPIXEL			GFXON
 #define GDISP_HARDWARE_PIXELREAD			GFXON
 #define GDISP_HARDWARE_CONTROL				GFXON
@@ -22,10 +21,10 @@
 // Both these pixel formats are supported - pick one.
 // RGB565 obviously is faster and uses less RAM but with lower color resolution than RGB888
 
-#if defined(GDISP_LTDC_USE_RGB565) && GDISP_LTDC_USE_RGB565
+#if defined(STM32LTDC_USE_RGB565) && STM32LTDC_USE_RGB565
 	#define GDISP_LLD_PIXELFORMAT			GDISP_PIXELFORMAT_RGB565
 	#if GDISP_TOTAL_DISPLAYS > 1
-		#error "LTDC: You must use RGB888 pixel format with LTDC when using dual layers as only RGB888 currently supports using alpha"
+		#error "GDISP - STM32LTDC: You must use RGB888 pixel format with LTDC when using dual layers as only RGB888 currently supports using alpha"
 	#endif
 #else
 	#define GDISP_LLD_PIXELFORMAT			GDISP_PIXELFORMAT_RGB888
@@ -36,7 +35,7 @@
 /* Don't change stuff below this line. Please.                               */
 /*===========================================================================*/
 
-#if LTDC_USE_DMA2D
+#if STM32LTDC_USE_DMA2D
 	// DMA2D supports accelerated fills
  	#define GDISP_HARDWARE_FILLS		GFXON
 

drivers/gdisp/STM32LTDC/readme.md

@@ -12,11 +12,19 @@ To use this driver:
 
 3. Add a `board_STM32LTDC.h` to you project directory (or board directory)
 	based on one of the templates.
+	
+# Configuration
+Configuration options available in `gfxconf.h`:
+
+| Option | Default | Description |
+| --- | --- | --- |
+| `STM32LTDC_DMA_CACHE_FLUSH` | `GFOFF` | Whether to flush the DMA cache on DMA2D operations. This will be turned on automatically on certian platforms/systems. |
+| `STM32LTDC_USE_DMA2D` | `GFXON` | Whether to use the DMA2D peripheral for hardware acceleration. |
+| `STM32LTDC_USE_LAYER2` | `GFXOFF` | Whether to use the 2nd LTDC layer. |
+| `STM32LTDC_USE_RGB565` | `GFXOFF` | Whether to use RGB565 instead of RGB888. |
 
 # 2nd layer
-Two things need to happen in order to use the 2nd LTDC layer:
-  - Set `LTDC_USE_2ND_LAYER` to `GFXON` in the board file.
-  - Set `GDISP_TOTAL_DISPLAYS` to `2` in `gfxconf.h`.
+To use the 2nd LTDC layer, set `STM32LTDC_USE_LAYER2` to `GFXON` in `gfxconf.h`.
 
 The 2nd layer is exposed as a separate display. Use `gdispGetDisplay()` to retrieve the individual layers.