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Statically allocate frame buffers. #17

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Statically allocate frame buffers. #17

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21 changes: 7 additions & 14 deletions src/hub75.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19,12 +19,8 @@

// Frame buffer for the HUB75 matrix - memory area where pixel data is stored
alignas(32) uint8_t *frame_buffer; ///< Back buffer — written by bitplane builder (read_chan_handler)
uint8_t *frame_buffer1; ///< Physical buffer A
uint8_t *frame_buffer2; ///< Physical buffer B
uint8_t *dma_buffer; ///< Front buffer — read by pixel_chan DMA → panel streamer

static uint32_t *rgb_buffer;

/**
* @struct row_cmd_t
* @brief Command structure for row control PIO state machine.
Expand Down Expand Up @@ -60,8 +56,6 @@ struct row_cmd_t
constexpr uint32_t row_cmd_struct_members = sizeof(row_cmd_t) / sizeof(uint32_t);

row_cmd_t *row_cmd_buffer;
row_cmd_t *row_cmd_buffer1;
row_cmd_t *row_cmd_buffer2;
row_cmd_t *dma_row_cmd_buffer;

static volatile bool swap_row_cmd_buffer_pending = false;
Expand Down Expand Up @@ -96,6 +90,13 @@ static const uint8_t BCM_SEQUENCE[] = {
constexpr uint8_t bcm_sequence_length = sizeof(BCM_SEQUENCE) / sizeof(uint8_t);

constexpr float SM_CLOCKDIV = (SM_CLOCKDIV_FACTOR < 1.0f) ? 1.0f : SM_CLOCKDIV_FACTOR;
static uint8_t frame_buffer1[(TOTAL_PIXELS >> 1) * bcm_sequence_length];
static uint8_t frame_buffer2[(TOTAL_PIXELS >> 1) * bcm_sequence_length];

static row_cmd_t row_cmd_buffer1[PanelConfig::SCAN_DEPTH * bcm_sequence_length];
static row_cmd_t row_cmd_buffer2[PanelConfig::SCAN_DEPTH * bcm_sequence_length];

static uint32_t rgb_buffer[TOTAL_PIXELS];

static void configure_pio(bool);
static void setup_dma_transfers();
Expand Down Expand Up @@ -656,20 +657,12 @@ void setup_bitplane_stream_irq()
*/
void create_hub75_driver(uint w, uint h, uint panel_type = PANEL_TYPE, bool inverted_stb = INVERTED_STB)
{
frame_buffer1 = new uint8_t[(TOTAL_PIXELS >> 1) * bcm_sequence_length];
frame_buffer2 = new uint8_t[(TOTAL_PIXELS >> 1) * bcm_sequence_length];

dma_buffer = frame_buffer1;
frame_buffer = frame_buffer2;

row_cmd_buffer1 = new row_cmd_t[PanelConfig::SCAN_DEPTH * bcm_sequence_length];
row_cmd_buffer2 = new row_cmd_t[PanelConfig::SCAN_DEPTH * bcm_sequence_length];

dma_row_cmd_buffer = row_cmd_buffer1;
row_cmd_buffer = row_cmd_buffer2;

rgb_buffer = new uint32_t[TOTAL_PIXELS]();

hub75_timing_init(&hub75_timing_config, clock_get_hz(clk_sys), SM_CLOCKDIV);

if (panel_type == PANEL_FM6126A)
Expand Down