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Initial implementation of lcddrvce with gradient example
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‎examples/library_examples/lcddrvce/gradient/.gitignore

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obj/
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bin/
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src/gfx/*.c
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src/gfx/*.h
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src/gfx/*.8xv
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.DS_Store
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convimg.yaml.lst

‎examples/library_examples/lcddrvce/gradient/makefile

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# ----------------------------
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# Makefile Options
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# ----------------------------
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NAME = DEMO
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ICON = icon.png
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DESCRIPTION = "CE C Toolchain Demo"
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COMPRESSED = NO
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CFLAGS = -Wall -Wextra -Oz
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CXXFLAGS = -Wall -Wextra -Oz
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# ----------------------------
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include $(shell cedev-config --makefile)

‎examples/library_examples/lcddrvce/gradient/src/main.c

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#include <lcddrvce.h>
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#include <sys/lcd.h>
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#include <ti/getcsc.h>
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#include <stdint.h>
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#include <string.h>
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/* Function Prototypes */
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void DrawGradient(uint24_t gradientStep);
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int main(void)
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{
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/* Initialize LCD driver */
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lcd_Init();
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/* Set uniform gamma profile */
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lcd_SetUniformGamma();
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/* Switch RAM access to SPI and display mode to MCU */
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lcd_SetRamInterface(LCD_RAM_SPI | LCD_DM_MCU);
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/* Set 18bpp pixel format */
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lcd_SetPixelFormat(LCD_RGB_18BPP | LCD_MCU_18BPP);
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/* Start RAM write command */
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lcd_SendCommand(LCD_CMD_RAMWR);
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/* Generate and display gradient patterns */
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DrawGradient(0x040404);
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DrawGradient(0x000004);
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DrawGradient(0x000400);
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DrawGradient(0x040000);
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/* Wait for a keypress */
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while (!os_GetCSC());
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/* Restore default LCD settings */
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lcd_SetDefaultGamma();
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lcd_SetRamInterface(LCD_RAMCTRL1_DEFAULT);
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lcd_SetPixelFormat(LCD_COLMOD_DEFAULT);
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/* Cleanup LCD driver */
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lcd_Cleanup();
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return 0;
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}
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void DrawGradient(uint24_t gradientStep)
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{
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/* Generate test pattern in line buffer */
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static uint24_t lineBuffer[LCD_WIDTH];
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uint24_t pixel = 0;
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size_t index = 0;
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while (index < LCD_WIDTH)
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{
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lineBuffer[index++] = pixel;
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lineBuffer[index++] = pixel;
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lineBuffer[index++] = pixel;
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lineBuffer[index++] = pixel;
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lineBuffer[index++] = pixel;
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pixel += gradientStep;
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}
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/* Send the line buffer to 1/4 of the display */
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for (uint8_t row = 0; row < LCD_HEIGHT / 4; row++)
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{
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lcd_SendParamsRaw(sizeof(lineBuffer), lineBuffer);
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}
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}

‎makefile

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include $(CURDIR)/src/common.mk
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LIBS := libload graphx fontlibc keypadc fileioc usbdrvce srldrvce msddrvce fatdrvce
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LIBS := libload graphx fontlibc keypadc fileioc usbdrvce srldrvce msddrvce fatdrvce lcddrvce
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SRCS := ce crt libc libcxx softfloat
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TOOLS := fasmg convbin convimg convfont cedev-config
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‎src/lcddrvce/lcddrvce.asm

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;-------------------------------------------------------------------------------
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include '../include/library.inc'
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;-------------------------------------------------------------------------------
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library LCDDRVCE, 0
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;-------------------------------------------------------------------------------
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; no dependencies
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;-------------------------------------------------------------------------------
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;-------------------------------------------------------------------------------
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; v1 functions
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;-------------------------------------------------------------------------------
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export lcd_Init
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export lcd_Cleanup
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export lcd_Wait
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export lcd_SendCommandRaw
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export lcd_SendParamsRaw
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export lcd_SendCommand
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export lcd_SendCommand1
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export lcd_SendCommand2
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export lcd_SendCommandBytes
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export lcd_SendCommandWords
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export lcd_SetUniformGamma
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export lcd_SetDefaultGamma
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macro checked_param param, limit
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assert (param) >= 0 & (param) <= (limit)
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db param
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end macro
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macro checked_param2 param1, limit1, param2, limit2
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assert (param1) >= 0 & (param1) <= (limit1)
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assert (param2) >= 0 & (param2) <= (limit2)
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db ((param2) shl 4) or (param1)
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end macro
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; Gamma voltage levels are specified here.
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; V0-V2, V20, V43, V61-V63 are the main points, ranging from 129 to 0.
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; V4, V6, V13 are interpolated between V2 and V20, ranging from 60 to 0.
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; V27, V36 are interpolated between V20 and V43, ranging from 25 to 0.
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; V50, V57, V59 are interpolated between V43 and V61, ranging from 60 to 0.
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; J0 and J1 are values between 0 and 3 affecting interpolations for remaining voltages.
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macro gamma_params V0, V1, V2, V20, V43, V61, V62, V63, V4, V6, V13, V27, V36, V50, V57, V59, J0, J1
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checked_param2 129-(V0), $0F, 23-(V63), $0F
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checked_param 128-(V1), $3F
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checked_param 128-(V2), $3F
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checked_param 57-(V4), $1F
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checked_param 47-(V6), $1F
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checked_param2 21-(V13), $0F, J0, $03
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checked_param 128-(V20), $7F
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checked_param2 20-(V27), $07, 11-(V36), $07
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checked_param 128-(V43), $7F
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checked_param2 54-(V50), $0F, J1, $03
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checked_param 44-(V57), $1F
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checked_param 34-(V59), $1F
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checked_param 64-(V61), $3F
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checked_param 64-(V62), $3F
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end macro
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lcd_Init:
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; Increase the refcount
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scf
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sbc hl,hl
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ld de, 0
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.refcount := $-3
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add hl, de
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ld (.refcount), hl
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ret c
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; Initialize if the old refcount was 0
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ld hl, ((9-1) shl 16) or (2-1)
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ld (ti.mpSpiCtrl1), hl
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; Only fully initialize once per program invocation
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ld hl, .fullinit
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srl (hl)
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jr nc, .fastinit
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; Magic initialization sequence to work on Python models
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ld de, ti.spiSpiFrFmt or ti.bmSpiFlash or ti.bmSpiFsPolarity or ti.bmSpiMasterMono
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.loop:
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ld (ti.mpSpiCtrl0), de
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ld hl, ti.bmSpiTxClr or ti.bmSpiRxClr
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ld (ti.mpSpiCtrl2), hl
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.fullinit:
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; Becomes a nop after being shifted
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db 1
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ld hl, ti.bmSpiChipReset
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ld (ti.mpSpiCtrl2), hl
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call ti.Delay10ms
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bit ti.bSpiClkPolarity, e
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ld e, ti.bmSpiFsPolarity or ti.bmSpiMasterMono or ti.bmSpiClkPhase or ti.bmSpiClkPolarity
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jr z, .loop
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.fastinit:
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ld hl, $21
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ld (ti.mpSpiIntCtrl), hl
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ld l, ti.bmSpiChipEn
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assert ti.bmSpiTxEn = (ti.bmSpiChipEn shl 8)
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ld h, l
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ld (ti.mpSpiCtrl2), hl
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ret
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lcd_Cleanup:
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; Decrease the refcount
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ld hl, (lcd_Init.refcount)
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ld de, 1
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add hl, de
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ld (lcd_Init.refcount), hl
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ret nc
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; Deinitialize if the new refcount is 0
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call lcd_Wait
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ld hl, ((3-1) shl 16) or (12-1)
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ld (ti.mpSpiCtrl1), hl
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ld hl, ti.bmSpiTxEn or ti.bmSpiTxClr or ti.bmSpiRxClr
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ld (ti.mpSpiCtrl2), hl
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ret
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lcd_Wait:
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ld hl, ti.mpSpiStatus + 1
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ld a, (1 shl (ti.bSpiTxFifoBytes - 8)) - 1
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.waitEmpty:
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cp a, (hl)
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jr c, .waitEmpty
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dec hl
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.waitBusy:
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bit ti.bSpiChipBusy, (hl)
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jr nz, .waitBusy
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ret
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lcd_SetUniformGamma:
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ld de, uniformGammaParams
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jr _Gamma
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lcd_SetDefaultGamma:
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ld de, defaultGammaParams
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_Gamma:
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; Set positive gamma
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ld bc, (14 shl 8) or $E0
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push bc
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call lcd_SendCommandRaw.entry
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; Set negative gamma
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ex de, hl
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pop bc
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inc c
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jr lcd_SendCommandRaw.entry
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lcd_SendCommandRaw:
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pop hl
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pop bc
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pop de
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push de
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push bc
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push hl
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.entry:
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ld hl, ti.mpSpiStatus + 1
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ld a, ((ti.bmSpiTxFifoBytes shr 8) and $FF) - 1
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.waitNotFull:
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cp a, (hl)
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jr c, .waitNotFull
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ld l, ti.spiData + 1
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ld (hl), h
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dec hl
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ld (hl), c
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ld c, 1
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mlt bc
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ex de, hl
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xor a, a
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sub a, c
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jr nz, lcd_SendParamsRaw.entry
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ret
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lcd_SendParamsRaw:
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pop hl
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pop bc
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pop de
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push de
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push bc
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push hl
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scf
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sbc hl, hl
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add hl, bc
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ex de, hl
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ret nc
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ld de, ti.mpSpiRange
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xor a, a
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sub a, c
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.entry:
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and a, 7
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add a, a
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add a, a
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ld (.sendParamsOffsetSMC), a
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.sendParamsLoop:
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ld e, ti.spiStatus + 1
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scf
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.waitForEight:
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ld a, (de)
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rla
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jr c, .waitForEight
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ld e, ti.spiData + 1
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jr nz, $
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.sendParamsOffsetSMC = $-1
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repeat 8
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ld (de), a
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dec de
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ldi
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end repeat
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ret po
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cp a, a
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jr .sendParamsLoop
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_sendSingleByte:
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ld l, ti.spiStatus + 1
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ld a, ((ti.bmSpiTxFifoBytes shr 8) and $FF) - 1
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.waitNotFull:
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cp a, (hl)
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jr c, .waitNotFull
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ld l, ti.spiData
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ld a, (de)
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ld (hl), a
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inc hl
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ld (hl), l
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ret
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lcd_SendCommand:
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ld b, 0+1
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jr lcd_SendCommandBytes.entry
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lcd_SendCommand1:
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ld b, 1+1
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jr lcd_SendCommandBytes.entry
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lcd_SendCommand2:
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ld b, 2+1
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jr lcd_SendCommandBytes.entry
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lcd_SendCommandBytes:
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pop hl
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pop bc
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push bc
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push hl
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inc b
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.entry:
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ld hl, 3
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add hl, sp
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ex de, hl
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ld hl, ti.mpSpiData + 1
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ld (hl), h
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.loop:
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call _sendSingleByte
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inc de
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inc de
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inc de
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djnz .loop
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ret
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lcd_SendCommandWords:
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ld hl, 4
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add hl, sp
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ld b, (hl)
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inc b
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ex de, hl
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ld hl, ti.mpSpiData + 1
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ld (hl), h
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.loop:
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dec de
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call _sendSingleByte
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dec b
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ret z
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inc de
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inc de
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inc de
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inc de
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call _sendSingleByte
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jr .loop
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defaultGammaParams:
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; Positive gamma
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gamma_params 129, 128, 128, 83, 65, 45, 41, 10, 41, 32, 11, 16, 6, 43, 20, 11, 1, 3
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; Negative gamma
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gamma_params 129, 128, 128, 85, 64, 45, 41, 10, 41, 32, 12, 17, 7, 43, 20, 11, 0, 3
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uniformGammaParams:
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; Positive gamma
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gamma_params 129, 125, 121, 83, 65, 45, 41, 10, 49, 38, 13, 16, 6, 43, 20, 11, 1, 3
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; Negative gamma
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gamma_params 129, 125, 121, 85, 64, 45, 41, 10, 49, 38, 14, 17, 7, 43, 20, 11, 0, 3

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