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feat(esp_lcd): Add PSRAM support in SPI LCD panel IO

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When the color buffer resides in PSRAM, set the SPI_TRANS_DMA_USE_PSRAM
flag.

Closes https://github.com/espressif/esp-idf/issues/18282
Merges https://github.com/espressif/esp-idf/pull/18283
This commit is contained in:
Daniel Kampert
2026-03-04 14:13:17 +08:00
committed by Chen Jichang
parent b4def1d7db
commit 58ce40e9bb
3 changed files with 41 additions and 10 deletions
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components/esp_lcd/spi/esp_lcd_panel_io_spi.c
+9 -1
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2021-2026 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -24,6 +24,7 @@
#include "esp_log.h"
#include "esp_check.h"
#include "esp_lcd_common.h"
#include "esp_memory_utils.h"
#include "freertos/FreeRTOS.h"
static const char *TAG = "lcd_panel.io.spi";
@@ -347,11 +348,14 @@ static esp_err_t panel_io_spi_tx_color(esp_lcd_panel_io_t *io, int lcd_cmd, cons
// use 8 lines for transmitting command, address and data
lcd_trans->base.flags |= (SPI_TRANS_MULTILINE_CMD | SPI_TRANS_MULTILINE_ADDR | SPI_TRANS_MODE_OCT);
}
// command is short, using polling mode
ret = spi_device_polling_transmit(spi_panel_io->spi_dev, &lcd_trans->base);
ESP_GOTO_ON_ERROR(ret, err, TAG, "spi transmit (polling) command failed");
}
bool color_in_psram = color && color_size && esp_ptr_external_ram(color);
// if the color buffer is big, we want to split it into chunks, and queue the chunks one by one
do {
size_t chunk_size = color_size;
@@ -367,6 +371,10 @@ static esp_err_t panel_io_spi_tx_color(esp_lcd_panel_io_t *io, int lcd_cmd, cons
spi_panel_io->num_trans_inflight--;
}
memset(lcd_trans, 0, sizeof(lcd_spi_trans_descriptor_t));
if (color_in_psram) {
// When the color buffer resides in PSRAM, set the DMA PSRAM flag
lcd_trans->base.flags |= SPI_TRANS_DMA_USE_PSRAM;
}
// SPI per-transfer size has its limitation, if the color buffer is too big, we need to split it into multiple chunks
if (chunk_size > spi_panel_io->spi_trans_max_bytes) {