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Add PWM backlight support + options

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- No eye blasting backlight
- Option to choose the prefered brightness
- Smooths transitions
This commit is contained in:
Kostas Missos
2018-09-19 00:01:42 +03:00
parent 780736591e
commit 67a470921a
10 changed files with 156 additions and 13 deletions
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44
bootloader/gfx/di.c
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@@ -137,14 +137,54 @@ void display_init()
exec_cfg((u32 *)DISPLAY_A_BASE, _display_config_11, 113);
}
void display_backlight_pwm_init()
{
clock_enable_pwm();
PWM(PWM_CONTROLLER_PWM_CSR) = (1 << 31); // Enable PWM
PINMUX_AUX(PINMUX_AUX_LCD_BL_PWM) = (PINMUX_AUX(PINMUX_AUX_LCD_BL_PWM) >> 2) << 2 | 1; // PWM clock source.
gpio_config(GPIO_PORT_V, GPIO_PIN_0, GPIO_MODE_SPIO); // Backlight power mode.
}
void display_backlight(bool enable)
{
gpio_write(GPIO_PORT_V, GPIO_PIN_0, enable ? GPIO_HIGH : GPIO_LOW); // Backlight PWM.
gpio_write(GPIO_PORT_V, GPIO_PIN_0, enable ? GPIO_HIGH : GPIO_LOW); // Backlight PWM GPIO.
}
void display_backlight_brightness(u32 brightness, u32 step_delay)
{
u32 old_value = (PWM(PWM_CONTROLLER_PWM_CSR) >> 16) & 0xFF;
if (brightness == old_value)
return;
if (brightness > 255)
brightness = 255;
if (old_value < brightness)
{
for (u32 i = old_value; i < brightness + 1; i++)
{
PWM(PWM_CONTROLLER_PWM_CSR) = (1 << 31) | (i << 16); // Enable PWM
usleep(step_delay);
}
}
else
{
for (u32 i = old_value; i > brightness; i--)
{
PWM(PWM_CONTROLLER_PWM_CSR) = (1 << 31) | (i << 16); // Enable PWM
usleep(step_delay);
}
}
if (!brightness)
PWM(PWM_CONTROLLER_PWM_CSR) = 0;
}
void display_end()
{
display_backlight(false);
display_backlight_brightness(0, 1000);
DSI(_DSIREG(DSI_VIDEO_MODE_CONTROL)) = 1;
DSI(_DSIREG(DSI_WR_DATA)) = 0x2805;