configs/z80sim and xtrs: Serial driver lower halfs ioctl methods should return a negated errno value, not set the errno variable.
drivers/wireless: CC1101 driver not permitted to set errno.
drivers/sensors: LIS331DL driver not permitted to set errno.
drivers/lcd: ILI9341 initialize method not permitted to set errno,
drivers/serial: 16550 UART driver IOCTL method must not set errno; it must return a negated errno value.
This implements the lcd interface to displaying data on the lcd display powered
by the ili9341 lcd driver.
This driver implements all methods defined in the lcd_dev_s structure except
getcontrast and setcontrast. They are not supported by the hardware.
Furthermore the driver allows to use multiple displays powered by the ili9342 IC
with only one driver instance. So it is theoretically possible to support more
than one connected ili9341 lcd display. The displays can be configured
independently. Currently two lcd devices supported. This should be enough for
now. Read the corresponding code section of how to add more devices if
neccessary.
The following settings are configurable:
1. Pixel format
Define the pixel format of the connected display. Currently only
RGB-565 supported.
2. Orientation
Define the orientation of the display. This can be portrait or
landscape and reversed values.
1. Write only
The driver allows to disable any getrun method if not neccessary to
reduce code size. This is done by enable CONFIG_LCD_NOGETRUN in the nuttx
configuration.
Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>
