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drivers/st77xx: expose configuration parameters in Kconfig
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@gschorcht
gschorcht committed Sep 7, 2023
1 parent 5c7a9cc commit 7599ce7
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68 changes: 68 additions & 0 deletions drivers/st77xx/Kconfig.st7735
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,72 @@ config MODULE_ST7735
help
ST7735 display controller is used

if MODULE_ST7735

menuconfig ST7735_CUSTOM_CONFIG
bool "ST7735 Custom Configuration"
help
Enable if customized configuration of voltages are needed. Otherwise
reset default values are used.

if ST7735_CUSTOM_CONFIG

config ST7735_AVDD
int "AVDD voltage (in millivolts)"
default 4900
range 4500 5100
help
Configure the AVDD voltage for analog circuits in millivolts.
Valid values must be in the range of 4500 (4.5V) to 5100 (5.1V)
in steps of 100.

config ST7735_GVDD
int "GVDD voltage (in millivolts)"
default 4600
range 3150 4700
help
Configure the GVDD voltage, the gamma reference positive voltage.
Valid values must be in the range of 3150 (3.15V) to 4700 (4.7V)
in steps of 50.

config ST7735_GVCL
int "GVCL voltage (in millivolts)"
default -4600
range -4700 -3150
help
Configure the GVCL voltage, the gamma reference negative voltage.
Valid values must be in the range of -4700 (-4.7V) to -3150 (-3.15V)
in steps of 50.

config ST7735_VCOM
int "VCOM voltage (in millivolts)"
default -775
range -2000 -425
help
Configure the VCOM voltage. VCOM needs to be adjusted to match the
capacitance and performance specifications of the TFT panel to
maximize contrast and minimize flickering.
Valid values must be in the range of -2000 (-2.0V) to -425 (-0.425V)
in steps of 25.

config ST7735_VGH
int "VGH voltage (in millivolts)"
default 14700
range 10000 15000
help
Configure the high voltage for gate drivers in millivolts.
Valid values must be in the range of 10000 (10V) to 15000 (15V) and
in the range of (2 * AVDD + 2.1V) and (3 * AVDD + 2.4 V).

config ST7735_VGL
int "VGL voltage (in millivolts)"
default -10000
range -13000 -7500
help
Configure the low voltage for gate drivers in millivolts.
Valid values must be in the range of -13000 (-13V) to -7500 (-7.5V)
in steps of 2500.

endif # ST7735_CUSTOM_CONFIG
endif # MODULE_ST7735
endif # MODULE_ST77XX
94 changes: 94 additions & 0 deletions drivers/st77xx/Kconfig.st7789
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,98 @@ config MODULE_ST7789
help
ST7789 display controller is used

if MODULE_ST7789

menuconfig ST7789_CUSTOM_CONFIG
bool "ST7789 Custom Configuration"
help
Enable if customized configuration of voltages are needed. Otherwise
reset default values are used.

if ST7789_CUSTOM_CONFIG

config ST7789_AVDD
int "AVDD voltage (in millivolts)"
default 6600
range 6400 6800
help
Configure the AVDD voltage for analog circuits in millivolts.
Valid values must be in the range of 6400 (6.4V) to 6800 (6.8V)
in steps of 200.

config ST7789_AVCL
int "AVDD voltage (in millivolts)"
default -4400
range -5000 -4400
help
Configure the AVCL voltage in millivolts.
Valid values must be in the range of -5000 (-5V) to -4400 (-4.4V)
in steps of 200.

config ST7789_VCOM
int "VCOM voltage (in millivolts)"
default 900
range 100 1675
help
Configure the VCOM voltage level. VCOM needs to be adjusted
to match the capacitance and performance specifications of the TFT panel
to maximize contrast and minimize flickering. VCOM is used to derive
the GVDD (gamma reference positive voltage) and the GVCL (gamma
reference negative voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)

Valid values must be in the range of 100 (0.1V) to 1675 (1.675V)
in steps of 25.

config ST7789_VCOM_OFFSET
int "VCOM voltage offset (in millivolts)"
default 0
range -800 775
help
Configure the VCOM voltage offset (VCOM_OFFSET). VCOM_OFFSET is used to
derive the GVDD (gamma reference positive voltage) and the GVCL (gamma
reference negative voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)

Valid values must be in the range of -800 (-0.8V) to 775 (0.775V)
in steps of 25.

config ST7789_VDV
int "VDV voltage offset factor (in millivolts)"
default 0
range -800 775
help
Configure the VDV voltage offset factor. VDV is used to derive the GVDD
(gamma reference positive voltage) and the GVCL (gamma reference
negative voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)

Valid values must be in the range of -800 (-0.8V) to 775 (0.775V)
in steps of 25.

config ST7789_VRH
int "VRH voltage range (in millivolts)"
default 4100
range 3550 5500
help
Configure the VRH voltage range. VRH is used to derive the GVDD (gamma
reference positive voltage) and the GVCL (gamma reference negative
voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)

Valid values must be in the range of 3350 (3.35V) to 5500 (5.5V)
in steps of 50.

# TODO ST7789_VGH and ST7789_VGL (non linear values)

endif # ST7789_CUSTOM_CONFIG
endif # MODULE_ST7789
endif # MODULE_ST77XX
79 changes: 79 additions & 0 deletions drivers/st77xx/Kconfig.st7796
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Original file line number Diff line number Diff line change
Expand Up @@ -13,4 +13,83 @@ config MODULE_ST7796
help
ST7796 display controller is used

if MODULE_ST7796

menuconfig ST7796_CUSTOM_CONFIG
bool "ST7796 Custom Configuration"
help
Enable if customized configuration of voltages are needed. Otherwise
reset default values are used.

if ST7796_CUSTOM_CONFIG

config ST7796_AVDD
int "AVDD voltage (in millivolts)"
default 6600
range 6200 6800
help
Configure the AVDD voltage for analog circuits in millivolts.
Valid values must be in the range of 6200 (6.2V) to 6800 (6.8V)
in steps of 200.

config ST7796_AVCL
int "AVDD voltage (in millivolts)"
default -4400
range -5000 -4400
help
Configure the AVCL voltage in millivolts.
Valid values must be in the range of -5000 (-5V) to -4400 (-4.4V)
in steps of 200.

config ST7796_VCOM
int "VCOM voltage (in millivolts)"
default 1000
range 300 1875
help
Configure the VCOM voltage level. VCOM needs to be adjusted to match
the capacitance and performance specifications of the TFT panel to
maximize contrast and minimize flickering. VCOM is used to derive the
GVDD (gamma reference positive voltage) and the GVCL (gamma reference
negative voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET
GVCL = -VRH + VCOM + VCOM_OFFSET

Valid values must be in the range of 300 (0.3V) to 1875 (1.875V)
in steps of 25.

config ST7796_VCOM_OFFSET
int "VCOM voltage offset (in millivolts)"
default 0
range -800 775
help
Configure the VCOM voltage offset (VCOM_OFFSET). VCOM_OFFSET is used to
derive the GVDD (gamma reference positive voltage) and the GVCL (gamma
reference negative voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET
GVCL = -VRH + VCOM + VCOM_OFFSET

Valid values must be in the range of -800 (-0.8V) to 775 (0.775V)
in steps of 25.

config ST7796_VRH
int "VRH voltage range (in millivolts)"
default 4500
range 3550 5500
help
Configure the VRH voltage range. VRH is used to derive the GVDD (gamma
reference positive voltage) and the GVCL (gamma reference negative
voltage) as follows:

GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)

Valid values must be in the range of 3350 (3.35V) to 5500 (5.5V)
in steps of 50.

# TODO ST7796_VGH and ST7796_VGL (non linear values)

endif # ST7796_CUSTOM_CONFIG
endif # MODULE_ST7796
endif # MODULE_ST77XX

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