162 lines
4 KiB
C
162 lines
4 KiB
C
#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "display_port.h"
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#include "sdkconfig.h"
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#include "driver/gpio.h"
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#include "disp_spi.h"
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#include "lvgl_i2c/i2c_manager.h"
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#include <stdbool.h>
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#include <assert.h>
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/* NOTE: Needed by the I2C Manager */
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#define OLED_I2C_PORT (CONFIG_LV_I2C_DISPLAY_PORT)
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/* FIXME: Be able to get display driver I2C address from Kconfig */
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#if defined (CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1306)
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#define OLED_I2C_ADDRESS 0x3C
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#else
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#define OLED_I2C_ADDRESS 0x00
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#endif
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// Control byte
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#define OLED_CONTROL_BYTE_CMD_SINGLE 0x80
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#define OLED_CONTROL_BYTE_CMD_STREAM 0x00
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#define OLED_CONTROL_BYTE_DATA_STREAM 0x40
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#define LV_DISPLAY_DC_CMD_MODE 0
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#define LV_DISPLAY_DC_DATA_MODE 1
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/* Helper functions to get display communication interface kind, this can be
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* implemented as users see fit, we're using the symbols created by Kconfig
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* because is what we have available.
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* Other ways to implement it is using the user_data poiter in lv_disp_drv_t */
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static inline bool display_interface_is_spi(lv_disp_drv_t * drv);
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static inline bool display_interface_is_i2c(lv_disp_drv_t * drv);
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void display_port_delay(lv_disp_drv_t *drv, uint32_t delay_ms)
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{
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(void) drv;
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vTaskDelay(pdMS_TO_TICKS(delay_ms));
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}
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void display_port_backlight(lv_disp_drv_t *drv, uint8_t state)
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{
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(void) drv;
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#ifdef CONFIG_LV_DISP_PIN_BCKL
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gpio_set_level(CONFIG_LV_DISP_PIN_BCKL, state);
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#endif
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}
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void display_port_gpio_dc(lv_disp_drv_t *drv, uint8_t state)
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{
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(void) drv;
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#ifdef CONFIG_LV_DISPLAY_USE_DC
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gpio_set_level(CONFIG_LV_DISP_PIN_DC, state);
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#endif
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}
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void display_port_gpio_rst(lv_disp_drv_t *drv, uint8_t state)
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{
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(void) drv;
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#ifdef CONFIG_LV_DISP_USE_RST
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gpio_set_level(CONFIG_LV_DISP_PIN_RST, state);
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#endif
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}
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bool display_port_gpio_is_busy(lv_disp_drv_t *drv)
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{
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(void) drv;
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bool device_busy = false;
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#ifdef CONFIG_LV_DISP_PIN_BUSY
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/* FIXME Assuming the busy signal in logic 1 means the device is busy */
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if (gpio_get_level(CONFIG_LV_DISP_PIN_BUSY) == 1) {
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device_busy = true;
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}
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#endif
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return device_busy;
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}
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void display_interface_send_cmd(lv_disp_drv_t *drv, uint32_t cmd, cmd_width_t cmd_width, void *args, size_t args_len)
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{
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(void) drv;
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if (display_interface_is_spi(drv)) {
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disp_wait_for_pending_transactions();
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display_port_gpio_dc(drv, LV_DISPLAY_DC_CMD_MODE);
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if (CMD_WIDTH_8BITS == cmd_width) {
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uint8_t cmd_8bits = (uint8_t) cmd & 0xFFU;
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disp_spi_send_data(&cmd_8bits, 1);
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}
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else if (CMD_WIDTH_16BITS == cmd_width) {
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/* Send 16bits cmd */
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}
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else {
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/* Invalid cmd size */
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assert(0);
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}
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if (args != CMD_WITHOUT_ARGS) {
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display_port_gpio_dc(drv, LV_DISPLAY_DC_DATA_MODE);
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disp_spi_send_data(args, args_len);
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}
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}
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if (display_interface_is_i2c(drv)) {
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uint8_t *data = (uint8_t *) args;
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lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, cmd, data, args_len);
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}
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}
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void display_interface_send_data(lv_disp_drv_t *drv, void *data, size_t len)
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{
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(void) drv;
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if (display_interface_is_spi(drv)) {
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disp_wait_for_pending_transactions();
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display_port_gpio_dc(drv, LV_DISPLAY_DC_DATA_MODE);
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disp_spi_send_colors(data, len);
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/* lv_disp_flush_ready is called in the SPI xfer done callback */
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}
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if (display_interface_is_i2c(drv)) {
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lvgl_i2c_write(OLED_I2C_PORT, OLED_I2C_ADDRESS, OLED_CONTROL_BYTE_DATA_STREAM, data, len);
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}
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}
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static inline bool display_interface_is_spi(lv_disp_drv_t * drv)
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{
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(void) drv;
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bool retval = false;
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#if defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_SPI)
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retval = true;
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#endif
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return retval;
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}
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static inline bool display_interface_is_i2c(lv_disp_drv_t * drv)
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{
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(void) drv;
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bool retval = false;
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#if defined (CONFIG_LV_TFT_DISPLAY_PROTOCOL_I2C)
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retval = true;
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#endif
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return retval;
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}
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