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drivers: ssd16xx: allow only specific RAM to update

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Allow only spedific RAM to update.

Signed-off-by: Johann Fischer <j.fischer@phytec.de>
This commit is contained in:
Johann Fischer 2019-07-09 16:10:12 +02:00 • committed by Maureen Helm
commit 17f7c59c83
2 changed files with 19 additions and 6 deletions
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24
drivers/display/ssd16xx.c
View file

@ -387,7 +387,8 @@ static int ssd16xx_set_pixel_format(const struct device *dev,
return -ENOTSUP; return -ENOTSUP;
} }
static int ssd16xx_clear_and_write_buffer(struct device *dev) static int ssd16xx_clear_and_write_buffer(struct device *dev, u8_t ram_cmd,
bool update)
{ {
int err; int err;
u8_t clear_page[EPD_PANEL_WIDTH]; u8_t clear_page[EPD_PANEL_WIDTH];
@ -419,8 +420,7 @@ static int ssd16xx_clear_and_write_buffer(struct device *dev)
gpio_pin_write(driver->dc, SSD16XX_DC_PIN, 0); gpio_pin_write(driver->dc, SSD16XX_DC_PIN, 0);
tmp = SSD16XX_CMD_WRITE_RAM; sbuf.buf = &ram_cmd;
sbuf.buf = &tmp;
sbuf.len = 1; sbuf.len = 1;
err = spi_write(driver->spi_dev, &driver->spi_config, &buf_set); err = spi_write(driver->spi_dev, &driver->spi_config, &buf_set);
if (err < 0) { if (err < 0) {
@ -439,7 +439,11 @@ static int ssd16xx_clear_and_write_buffer(struct device *dev)
} }
} }
return ssd16xx_update_display(dev); if (update) {
return ssd16xx_update_display(dev);
}
return 0;
} }
static int ssd16xx_controller_init(struct device *dev) static int ssd16xx_controller_init(struct device *dev)
@ -523,7 +527,15 @@ static int ssd16xx_controller_init(struct device *dev)
return err; return err;
} }
err = ssd16xx_clear_and_write_buffer(dev); err = ssd16xx_clear_and_write_buffer(dev, SSD16XX_CMD_WRITE_RAM, true);
if (err < 0) {
return err;
}
ssd16xx_busy_wait(driver);
err = ssd16xx_clear_and_write_buffer(dev, SSD16XX_CMD_WRITE_RED_RAM,
false);
if (err < 0) { if (err < 0) {
return err; return err;
} }
@ -537,7 +549,7 @@ static int ssd16xx_controller_init(struct device *dev)
return err; return err;
} }
return ssd16xx_clear_and_write_buffer(dev); return ssd16xx_clear_and_write_buffer(dev, SSD16XX_CMD_WRITE_RAM, true);
} }
static int ssd16xx_init(struct device *dev) static int ssd16xx_init(struct device *dev)

1
drivers/display/ssd16xx_regs.h
View file

@ -22,6 +22,7 @@
#define SSD16XX_CMD_UPDATE_CTRL1 0x21 #define SSD16XX_CMD_UPDATE_CTRL1 0x21
#define SSD16XX_CMD_UPDATE_CTRL2 0x22 #define SSD16XX_CMD_UPDATE_CTRL2 0x22
#define SSD16XX_CMD_WRITE_RAM 0x24 #define SSD16XX_CMD_WRITE_RAM 0x24
#define SSD16XX_CMD_WRITE_RED_RAM 0x26
#define SSD16XX_CMD_VCOM_SENSE 0x28 #define SSD16XX_CMD_VCOM_SENSE 0x28
#define SSD16XX_CMD_VCOM_SENSE_DURATON 0x29 #define SSD16XX_CMD_VCOM_SENSE_DURATON 0x29
#define SSD16XX_CMD_PRGM_VCOM_OTP 0x2a #define SSD16XX_CMD_PRGM_VCOM_OTP 0x2a