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Minor performance boost for ILI9488 

ILI9488 displays have become more available and more library users are using the SPI version.

An option to use a bidirectional MOSI pin with ESP32 has been added, so SDO can be left disconnected. See #898
This commit is contained in:
Bodmer 2021-02-19 22:20:55 +00:00
parent b150433451
commit 3f19788c93
2 changed files with 47 additions and 1 deletions
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44
Processors/TFT_eSPI_ESP32.h
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@ -374,8 +374,49 @@
// Macros to write commands/pixel colour data to a SPI ILI948x TFT
////////////////////////////////////////////////////////////////////////////////////////
#elif defined (SPI_18BIT_DRIVER) // SPI 18 bit colour
//*
#define TFT_WRITE_BITS(D, B) *_spi_mosi_dlen = B-1; \
*_spi_w = D; \
*_spi_cmd = SPI_USR; \
while (*_spi_cmd & SPI_USR);
// ESP32 low level SPI writes for 8, 16 and 32 bit values too fast for ILI9488
// ESP32 low level SPI writes for 24 bit values too fast for ILI9488
// Write 8 bits to TFT
#define tft_Write_8(C) TFT_WRITE_BITS(C, 8)
// Convert 16 bit colour to 18 bit and write in 3 bytes
#define tft_Write_16(C) TFT_WRITE_BITS((((C) & 0xF800)>>8), 8); \
TFT_WRITE_BITS((((C) & 0x07E0)>>3), 8); \
TFT_WRITE_BITS((((C) & 0x001F)<<3), 8)
// Convert 16 bit colour to 18 bit and write in 3 bytes
#define tft_Write_16N(C) TFT_WRITE_BITS((((C) & 0xF800)>>8), 8); \
TFT_WRITE_BITS((((C) & 0x07E0)>>3), 8); \
*_spi_mosi_dlen = 8-1; \
*_spi_w = ((((C) & 0x001F)<<3)); \
*_spi_cmd = SPI_USR;\
//while (*_spi_cmd & SPI_USR);
// Convert swapped byte 16 bit colour to 18 bit and write in 3 bytes
#define tft_Write_16S(C) TFT_WRITE_BITS(((C) & 0xF8), 8); \
TFT_WRITE_BITS((((C) & 0xE000)>>11 | ((C) & 0x07)<<5), 8); \
TFT_WRITE_BITS((((C) & 0x1F00)>>5), 8)
// Write 32 bits to TFT
//#define tft_Write_32(C) spi.write32(C)
#define tft_Write_32(C) TFT_WRITE_BITS(C, 32)
// Write two concatenated 16 bit values to TFT
//#define tft_Write_32C(C,D) spi.write32((C)<<16 | (D))
#define tft_Write_32C(C,D) TFT_WRITE_BITS((uint16_t)((D)<<8 | (D)>>8)<<16 | (uint16_t)((C)<<8 | (C)>>8), 32)
// Write 16 bit value twice to TFT
//#define tft_Write_32D(C) spi.write32((C)<<16 | (C))
#define tft_Write_32D(C) TFT_WRITE_BITS((uint16_t)((C)<<8 | (C)>>8)<<16 | (uint16_t)((C)<<8 | (C)>>8), 32)
//*/
/*
// ESP32 low level SPI writes for 8, 16 and 32 bit values - slower variant for ILI9488
// Write 8 bits to TFT
#define tft_Write_8(C) spi.transfer(C)
@ -402,6 +443,7 @@
// Write 16 bit value twice to TFT
#define tft_Write_32D(C) spi.write32((C)<<16 | (C))
//*/
////////////////////////////////////////////////////////////////////////////////////////
// Macros to write commands/pixel colour data to an Raspberry Pi TFT

4
TFT_Drivers/ILI9488_Init.h
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@ -65,7 +65,11 @@
#endif
writecommand(0xB0); // Interface Mode Control
#ifdef TFT_SDA_READ
writedata(0x80);
#else
writedata(0x00);
#endif
writecommand(0xB1); // Frame Rate Control
writedata(0xA0);