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rgb_lcd: support update pclk at runtime

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This commit is contained in:
morris
2022-06-01 11:00:00 +08:00
parent 843279d287
commit b2bb8fd3c4
4 changed files with 49 additions and 2 deletions
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24
components/esp_lcd/src/esp_lcd_rgb_panel.c
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@@ -88,10 +88,12 @@ struct esp_rgb_panel_t {
void *user_ctx; // Reserved user's data of callback functions
int x_gap; // Extra gap in x coordinate, it's used when calculate the flush window
int y_gap; // Extra gap in y coordinate, it's used when calculate the flush window
portMUX_TYPE spinlock; // to protect panel specific resource from concurrent access (e.g. between task and ISR)
struct {
unsigned int disp_en_level: 1; // The level which can turn on the screen by `disp_gpio_num`
unsigned int stream_mode: 1; // If set, the LCD transfers data continuously, otherwise, it stops refreshing the LCD when transaction done
unsigned int fb_in_psram: 1; // Whether the frame buffer is in PSRAM
unsigned int need_update_pclk: 1; // Whether to update the PCLK before start a new transaction
} flags;
dma_descriptor_t dma_nodes[]; // DMA descriptor pool of size `num_dma_nodes`
};
@@ -187,6 +189,7 @@ esp_err_t esp_lcd_new_rgb_panel(const esp_lcd_rgb_panel_config_t *rgb_panel_conf
rgb_panel->flags.disp_en_level = !rgb_panel_config->flags.disp_active_low;
rgb_panel->on_frame_trans_done = rgb_panel_config->on_frame_trans_done;
rgb_panel->user_ctx = rgb_panel_config->user_ctx;
rgb_panel->spinlock = (portMUX_TYPE)portMUX_INITIALIZER_UNLOCKED;
// fill function table
rgb_panel->base.del = rgb_panel_del;
rgb_panel->base.reset = rgb_panel_reset;
@@ -227,6 +230,18 @@ err:
return ret;
}
esp_err_t esp_rgb_panel_set_pclk(esp_lcd_panel_handle_t panel, uint32_t freq_hz)
{
ESP_RETURN_ON_FALSE(panel, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base);
// the pclk frequency will be updated in `lcd_rgb_panel_start_transmission()`
portENTER_CRITICAL(&rgb_panel->spinlock);
rgb_panel->flags.need_update_pclk = true;
rgb_panel->timings.pclk_hz = freq_hz;
portEXIT_CRITICAL(&rgb_panel->spinlock);
return ESP_OK;
}
static esp_err_t rgb_panel_del(esp_lcd_panel_t *panel)
{
esp_rgb_panel_t *rgb_panel = __containerof(panel, esp_rgb_panel_t, base);
@@ -499,6 +514,15 @@ static void lcd_rgb_panel_start_transmission(esp_rgb_panel_t *rgb_panel)
// reset FIFO of DMA and LCD, incase there remains old frame data
gdma_reset(rgb_panel->dma_chan);
lcd_ll_stop(rgb_panel->hal.dev);
// check whether to update the PCLK frequency
portENTER_CRITICAL_SAFE(&rgb_panel->spinlock);
if (unlikely(rgb_panel->flags.need_update_pclk)) {
rgb_panel->flags.need_update_pclk = false;
rgb_panel->timings.pclk_hz = lcd_hal_cal_pclk_freq(&rgb_panel->hal, rgb_panel->src_clk_hz, rgb_panel->timings.pclk_hz);
}
portEXIT_CRITICAL_SAFE(&rgb_panel->spinlock);
lcd_ll_fifo_reset(rgb_panel->hal.dev);
gdma_start(rgb_panel->dma_chan, (intptr_t)rgb_panel->dma_nodes);
// delay 1us is sufficient for DMA to pass data to LCD FIFO