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96 lines
2.8 KiB
Plaintext
96 lines
2.8 KiB
Plaintext
# Copyright (c) 2020 HAW Hamburg
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#
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# This file is subject to the terms and conditions of the GNU Lesser
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# General Public License v2.1. See the file LICENSE in the top level
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# directory for more details.
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#
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if MODULE_ST77XX
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config MODULE_ST7796
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bool "ST7796 display"
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default y if HAVE_ST7796
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help
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ST7796 display controller is used
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if MODULE_ST7796
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menuconfig ST7796_CUSTOM_CONFIG
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bool "ST7796 Custom Configuration"
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help
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Enable if customized configuration of voltages are needed. Otherwise
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reset default values are used.
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if ST7796_CUSTOM_CONFIG
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config ST7796_AVDD
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int "AVDD voltage (in millivolts)"
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default 6600
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range 6200 6800
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help
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Configure the AVDD voltage for analog circuits in millivolts.
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Valid values must be in the range of 6200 (6.2V) to 6800 (6.8V)
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in steps of 200.
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config ST7796_AVCL
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int "AVDD voltage (in millivolts)"
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default -4400
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range -5000 -4400
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help
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Configure the AVCL voltage in millivolts.
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Valid values must be in the range of -5000 (-5V) to -4400 (-4.4V)
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in steps of 200.
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config ST7796_VCOM
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int "VCOM voltage (in millivolts)"
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default 1000
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range 300 1875
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help
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Configure the VCOM voltage level. VCOM needs to be adjusted to match
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the capacitance and performance specifications of the TFT panel to
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maximize contrast and minimize flickering. VCOM is used to derive the
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GVDD (gamma reference positive voltage) and the GVCL (gamma reference
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negative voltage) as follows:
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GDDV = +VRH + VCOM + VCOM_OFFSET
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GVCL = -VRH + VCOM + VCOM_OFFSET
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Valid values must be in the range of 300 (0.3V) to 1875 (1.875V)
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in steps of 25.
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config ST7796_VCOM_OFFSET
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int "VCOM voltage offset (in millivolts)"
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default 0
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range -800 775
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help
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Configure the VCOM voltage offset (VCOM_OFFSET). VCOM_OFFSET is used to
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derive the GVDD (gamma reference positive voltage) and the GVCL (gamma
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reference negative voltage) as follows:
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GDDV = +VRH + VCOM + VCOM_OFFSET
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GVCL = -VRH + VCOM + VCOM_OFFSET
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Valid values must be in the range of -800 (-0.8V) to 775 (0.775V)
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in steps of 25.
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config ST7796_VRH
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int "VRH voltage range (in millivolts)"
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default 4500
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range 3550 5500
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help
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Configure the VRH voltage range. VRH is used to derive the GVDD (gamma
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reference positive voltage) and the GVCL (gamma reference negative
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voltage) as follows:
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GDDV = +VRH + VCOM + VCOM_OFFSET + (0.5 * VDV)
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GVCL = -VRH + VCOM + VCOM_OFFSET - (0.5 * VDV)
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Valid values must be in the range of 3350 (3.35V) to 5500 (5.5V)
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in steps of 50.
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# TODO ST7796_VGH and ST7796_VGL (non linear values)
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endif # ST7796_CUSTOM_CONFIG
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endif # MODULE_ST7796
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endif # MODULE_ST77XX
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