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Jan 2, 2025
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Sunton 8048S050: Configure display frequency in settings.toml #9911

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Sunton 8048S050: Configure display frequency in settings.toml
RetiredWizard Dec 24, 2024
ae3aa28
environment.rst typo
RetiredWizard Dec 24, 2024
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10 changes: 10 additions & 0 deletions docs/environment.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -119,3 +119,13 @@ If the CIRCUITPY_DISPLAY_ROTATION parameter is set the display will be initializ
during power up with the selected rotation, otherwise the display will be initialized with
a rotation of 0. Attempting to initialize the screen with a rotation other than 0,
90, 180 or 270 is not supported and will result in an unexpected screen rotation.

`Sunton ESP32-8048S050 <https://circuitpython.org/board/sunton_esp32_8048S050/>`_

CIRCUITPY_DISPLAY_FREQUENCY
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allows the entry of a display frequency used during the "dotclock" framebuffer construction.
If a valid frequency is not defined the board will initialize the framebuffer with a
frequency of 12500000hz (12.5Mhz). The value should be entered as an integer in hertz
i.e. CIRCUITPY_DISPLAY_FREQUENCY=16000000 will override the default value with a 16Mhz
display frequency.
8 changes: 7 additions & 1 deletion ports/espressif/boards/sunton_esp32_8048S050/board.c
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Expand Up @@ -12,6 +12,7 @@
#include "shared-bindings/framebufferio/FramebufferDisplay.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-module/displayio/__init__.h"
#include "shared-module/os/__init__.h"

static const mcu_pin_obj_t *blue_pins[] = {
&pin_GPIO8,
Expand All @@ -37,6 +38,7 @@ static const mcu_pin_obj_t *red_pins[] = {
};

static void display_init(void) {
mp_int_t frequency;

// Turn on backlight
gpio_set_direction(2, GPIO_MODE_DEF_OUTPUT);
Expand All @@ -45,6 +47,10 @@ static void display_init(void) {

dotclockframebuffer_framebuffer_obj_t *framebuffer = &allocate_display_bus_or_raise()->dotclock;
framebuffer->base.type = &dotclockframebuffer_framebuffer_type;
os_getenv_err_t result = common_hal_os_getenv_int("CIRCUITPY_DISPLAY_FREQUENCY", &frequency);
if (result != GETENV_OK) {
frequency = 12500000;
}

common_hal_dotclockframebuffer_framebuffer_construct(
framebuffer,
Expand All @@ -55,7 +61,7 @@ static void display_init(void) {
red_pins, MP_ARRAY_SIZE(red_pins),
green_pins, MP_ARRAY_SIZE(green_pins),
blue_pins, MP_ARRAY_SIZE(blue_pins),
12500000, // Frequency
frequency, // Frequency
800, // width
480, // height
4, 8, 8, true, // horiz: pulse, back porch, front porch, idle low
Expand Down