diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/platforms/esp32s3/gdma_lcd_parallel16.cpp | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/src/platforms/esp32s3/gdma_lcd_parallel16.cpp b/src/platforms/esp32s3/gdma_lcd_parallel16.cpp index 0937400..ddd9243 100644 --- a/src/platforms/esp32s3/gdma_lcd_parallel16.cpp +++ b/src/platforms/esp32s3/gdma_lcd_parallel16.cpp @@ -109,10 +109,24 @@ LCD_CAM.lcd_clock.lcd_clk_equ_sysclk = 1; // PCLK = CLK / 1 (... so 160Mhz still) - if (_cfg.psram_clk_override) // fastest speed I can get PSRAM to work before nothing shows + // https://esp32.com/viewtopic.php?f=5&t=24459&start=80#p94487 + /* Re: ESP32-S3 LCD and I2S FULL documentation + * by ESP_Sprite ยป Fri Mar 25, 2022 2:06 am + * + * Are you sure you are staying within the limits of the psram throughput? If GDMA can't fetch data fast + * enough it leads to corruption. Also keep in mind that worst case scenario, the gdma can only use half of + * the bandwidth of the psram peripheral (as it's round-robin shared with the CPUs). + */ + + // Fastest speed I can get with Octoal PSRAM to work before nothing shows. Based on manual testing. + // If using an ESP32-S3 with slower (half the bandwidth) Q-SPI (Quad), then the divisor will need to be '20' (8Mhz) which wil be flickery! + if (_cfg.psram_clk_override) { ESP_LOGI("S3", "DMA buffer is on PSRAM. Limiting clockspeed...."); - LCD_CAM.lcd_clock.lcd_clkm_div_num = 10; //16mhz is the fasted the Octal PSRAM can support it seems + //LCD_CAM.lcd_clock.lcd_clkm_div_num = 10; //16mhz is the fasted the Octal PSRAM can support it seems from faptastic's testing using an N8R8 variant (Octal SPI PSRAM). + + // https://github.com/mrfaptastic/ESP32-HUB75-MatrixPanel-DMA/issues/441#issuecomment-1513631890 + LCD_CAM.lcd_clock.lcd_clkm_div_num = 12; // 13Mhz is the fastest when the DMA memory is needed to service other peripherals as well. } else { @@ -148,13 +162,16 @@ LCD_CAM.lcd_ctrl.lcd_rgb_mode_en = 0; // i8080 mode (not RGB) LCD_CAM.lcd_rgb_yuv.lcd_conv_bypass = 0; // Disable RGB/YUV converter LCD_CAM.lcd_misc.lcd_next_frame_en = 0; // Do NOT auto-frame + + LCD_CAM.lcd_misc.lcd_bk_en = 1; // https://esp32.com/viewtopic.php?t=24459&start=60#p91835 + LCD_CAM.lcd_data_dout_mode.val = 0; // No data delays LCD_CAM.lcd_user.lcd_always_out_en = 1; // Enable 'always out' mode LCD_CAM.lcd_user.lcd_8bits_order = 0; // Do not swap bytes LCD_CAM.lcd_user.lcd_bit_order = 0; // Do not reverse bit order LCD_CAM.lcd_user.lcd_2byte_en = 1; // 8-bit data mode LCD_CAM.lcd_user.lcd_dummy = 1; // Dummy phase(s) @ LCD start - LCD_CAM.lcd_user.lcd_dummy_cyclelen = 100; // 1 dummy phase + LCD_CAM.lcd_user.lcd_dummy_cyclelen = 1; // 1+1 dummy phase LCD_CAM.lcd_user.lcd_cmd = 0; // No command at LCD start // "Dummy phases" are initial LCD peripheral clock cycles before data // begins transmitting when requested. After much testing, determined |