ScStw/ESP32-HUB75-MatrixPanel-DMA
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Double buff w/o delay

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- removed delay() from buffer swap
 - add new method to check if back buffer is safe to write to
 - obsolete showDMABuffer()
This commit is contained in:
Emil Muratov 2021-08-19 19:33:41 +03:00
parent e12eaf15b5
commit 03d6594a1c
2 changed files with 18 additions and 22 deletions
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32
ESP32-HUB75-MatrixPanel-I2S-DMA.h
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@ -388,7 +388,7 @@ class MatrixPanel_I2S_DMA {
// Setup the ESP32 DMA Engine. Sprite_TM built this stuff.
configureDMA(m_cfg); //DMA and I2S configuration and setup
showDMABuffer(); // show backbuf_id of 0
flipDMABuffer(); // show backbuf_id of 0
#if SERIAL_DEBUG
if (!initialized)
@ -494,22 +494,6 @@ class MatrixPanel_I2S_DMA {
inline void flipDMABuffer()
{
if ( !m_cfg.double_buff) return;
// Flip to other buffer as the backbuffer. i.e. Graphic changes happen to this buffer (but aren't displayed until showDMABuffer())
back_buffer_id ^= 1;
#if SERIAL_DEBUG
Serial.printf_P(PSTR("Set back buffer to: %d\n"), back_buffer_id);
#endif
// Wait before we allow any writing to the buffer. Stop flicker.
while(!i2s_parallel_is_previous_buffer_free()) { delay(1); }
}
inline void showDMABuffer()
{
if ( !m_cfg.double_buff) return;
#if SERIAL_DEBUG
@ -518,10 +502,20 @@ class MatrixPanel_I2S_DMA {
i2s_parallel_flip_to_buffer(I2S_NUM_0, back_buffer_id);
// Wait before we allow any writing to the buffer. Stop flicker.
while(!i2s_parallel_is_previous_buffer_free()) { delay(1); }
// Flip to other buffer as the backbuffer. i.e. Graphic changes happen to this buffer (but aren't displayed until showDMABuffer())
back_buffer_id ^= 1;
#if SERIAL_DEBUG
Serial.printf_P(PSTR("Set back buffer to: %d\n"), back_buffer_id);
#endif
}
// stub function for compatibility
void showDMABuffer(){}
// check if backbuffer still has DMA transfer in progress or is it safe to write there
bool backbuffready(){ return i2s_parallel_is_previous_buffer_free(); }
inline void setPanelBrightness(int b)
{
// Change to set the brightness of the display, range of 1 to matrixWidth (i.e. 1 - 64)

4
ESP32-VirtualMatrixPanel-I2S-DMA.h
View file

@ -98,7 +98,9 @@ class VirtualMatrixPanel
}
void flipDMABuffer() { display->flipDMABuffer(); }
void showDMABuffer() { display->showDMABuffer(); }
void showDMABuffer() {}
bool backbuffready(){ return display->backbuffready(); }
void drawDisplayTest();