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HUB75: use FM6124 driver for 4-scan panels, remove 64x64 limitation if board has PSRAM (partial solution for #5628) #5647

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Merged
softhack007 merged 3 commits into from
May 29, 2026
+11 −6
Merged

HUB75: use FM6124 driver for 4-scan panels, remove 64x64 limitation if board has PSRAM (partial solution for #5628) #5647

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b523f97
HUB75: use FM6124 driver for 4-scan panels, remove 64x64 limitation
softhack007 May 23, 2026
95ec484
Merge branch '16_x' into hub75_driver_patch1
softhack007 May 23, 2026
10fd3b4
HUB75: remove dead condition
softhack007 May 23, 2026
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17 changes: 11 additions & 6 deletions wled00/bus_manager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -813,6 +813,7 @@ BusHub75Matrix::BusHub75Matrix(const BusConfig &bc) : Bus(bc.type, bc.start, bc.

// mxconfig.driver = HUB75_I2S_CFG::ICN2038S; // experimental - use specific shift register driver
// mxconfig.driver = HUB75_I2S_CFG::FM6124; // try this driver in case you panel stays dark, or when colors look too pastel
// Other possible shiftreg drivers: HUB75_I2S_CFG::FM6126A, HUB75_I2S_CFG::ICN2038S, HUB75_I2S_CFG::MBI5124, HUB75_I2S_CFG::DP3246

// mxconfig.latch_blanking = 3;
// mxconfig.i2sspeed = HUB75_I2S_CFG::HZ_10M; // experimental - 5MHZ should be enugh, but colours looks slightly better at 10MHz
Expand All @@ -824,8 +825,13 @@ BusHub75Matrix::BusHub75Matrix(const BusConfig &bc) : Bus(bc.type, bc.start, bc.
mxconfig.chain_length = max((uint8_t) 1, min(chainLength, (uint8_t) 4));

if (mxconfig.mx_height >= 64 && (mxconfig.chain_length > 1)) {
DEBUGBUS_PRINTLN(F("WARNING, only single panel can be used of 64 pixel boards due to memory"));
mxconfig.chain_length = 1;
#if defined(BOARD_HAS_PSRAM) // limitation to one panel only applies to boards without PSRAM
if (!psramFound() || ESP.getPsramSize() == 0) // PSRAM sanity check
#endif
{
DEBUGBUS_PRINTLN(F("WARNING, only single panel can be used of 64 pixel boards due to memory"));
mxconfig.chain_length = 1;
}
}

if (bc.type == TYPE_HUB75MATRIX_HS) {
Expand All @@ -835,6 +841,7 @@ BusHub75Matrix::BusHub75Matrix(const BusConfig &bc) : Bus(bc.type, bc.start, bc.
_isVirtual = true;
mxconfig.mx_width = min((uint8_t) 64, panelWidth) * 2;
mxconfig.mx_height = min((uint8_t) 64, panelHeight) / 2;
mxconfig.driver = HUB75_I2S_CFG::FM6124; // use FM6124 for "outdoor" 4-scan panels - workaround until we can make the driver user-configurable
} else {
DEBUGBUS_PRINTLN("Unknown type");
return;
Expand Down Expand Up @@ -990,10 +997,8 @@ BusHub75Matrix::BusHub75Matrix(const BusConfig &bc) : Bus(bc.type, bc.start, bc.
}
setBitArray(_ledsDirty, _len, false); // reset dirty bits

if (mxconfig.double_buff == false) {
// create LEDs buffer (initialized to BLACK), prefer DRAM if enough heap is available (faster in case global _pixels buffer is in PSRAM as not both will fit the cache)
_ledBuffer = static_cast<CRGB*>(allocate_buffer(_len * sizeof(CRGB), BFRALLOC_PREFER_DRAM | BFRALLOC_CLEAR));
}
// create LEDs buffer (initialized to BLACK), prefer DRAM if enough heap is available (faster in case global _pixels buffer is in PSRAM as not both will fit the cache)
_ledBuffer = static_cast<CRGB*>(allocate_buffer(_len * sizeof(CRGB), BFRALLOC_PREFER_DRAM | BFRALLOC_CLEAR));
}

PANEL_CHAIN_TYPE chainType = CHAIN_NONE; // default for quarter-scan panels that do not use chaining
Expand Down
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