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drivers: ssd16xx: add temperature sensor support

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Appropriate WS can be loaded automatically if
the display controller has integrated temperature
sensor or an external sensor is connected.

Signed-off-by: Johann Fischer <j.fischer@phytec.de>
This commit is contained in:
Johann Fischer 2020-05-11 16:29:47 +02:00 • committed by Carles Cufí
commit 3f19918041
3 changed files with 33 additions and 3 deletions
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1
boards/shields/waveshare_epaper/waveshare_epaper_gdeh0154a07.overlay
View file

@ -24,5 +24,6 @@
sdv = [41 a8 32]; sdv = [41 a8 32];
vcom = <0x00>; vcom = <0x00>;
border-waveform = <0x05>; border-waveform = <0x05>;
tssv = <0x80>;
}; };
}; };

26
drivers/display/ssd16xx.c
View file

@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2018 PHYTEC Messtechnik GmbH * Copyright (c) 2018-2020 PHYTEC Messtechnik GmbH
* *
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
*/ */
@ -22,7 +22,7 @@ LOG_MODULE_REGISTER(ssd16xx);
#include <display/cfb.h> #include <display/cfb.h>
/** /**
* SSD1673, SSD1608 compatible EPD controller driver. * SSD1673, SSD1608, SSD1681, ILI3897 compatible EPD controller driver.
*/ */
#define SSD16XX_SPI_FREQ DT_INST_PROP(0, spi_max_frequency) #define SSD16XX_SPI_FREQ DT_INST_PROP(0, spi_max_frequency)
@ -435,9 +435,28 @@ static int ssd16xx_clear_cntlr_mem(struct device *dev, uint8_t ram_cmd,
static inline int ssd16xx_load_ws_from_otp(struct device *dev) static inline int ssd16xx_load_ws_from_otp(struct device *dev)
{ {
struct ssd16xx_data *driver = dev->driver_data; struct ssd16xx_data *driver = dev->driver_data;
int16_t t = (SSD16XX_DEFAULT_TR_VALUE * SSD16XX_TR_SCALE_FACTOR);
uint8_t tmp[2]; uint8_t tmp[2];
#if DT_INST_NODE_HAS_PROP(0, tssv)
/*
* Controller has an integrated temperature sensor or external
* temperature sensor is connected to the controller.
*/
LOG_INF("Select and load WS from OTP");
tmp[0] = DT_INST_PROP(0, tssv);
if (ssd16xx_write_cmd(driver,
SSD16XX_CMD_TSENSOR_SELECTION,
tmp, 1)) {
return -EIO;
}
driver->update_cmd |= SSD16XX_CTRL2_LOAD_LUT |
SSD16XX_CTRL2_LOAD_TEMPERATURE;
return 0;
#else
int16_t t = (SSD16XX_DEFAULT_TR_VALUE * SSD16XX_TR_SCALE_FACTOR);
LOG_INF("Load default WS (25 degrees Celsius) from OTP"); LOG_INF("Load default WS (25 degrees Celsius) from OTP");
@ -477,6 +496,7 @@ static inline int ssd16xx_load_ws_from_otp(struct device *dev)
driver->update_cmd |= SSD16XX_CTRL2_LOAD_LUT; driver->update_cmd |= SSD16XX_CTRL2_LOAD_LUT;
return 0; return 0;
#endif
} }
static int ssd16xx_load_ws_initial(struct device *dev) static int ssd16xx_load_ws_initial(struct device *dev)

9
dts/bindings/display/solomon,ssd16xx.yaml
View file

@ -92,3 +92,12 @@ properties:
lut-default: lut-default:
type: uint8-array type: uint8-array
required: false required: false
tssv:
type: int
required: false
description: Temperature Sensor Selection Value
Display controller can have integrated temperature sensor or
an external temperature sensor is connected to the controller.
The value selects which sensor should be used.