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Merged
dhalbert merged 3 commits into from
Oct 27, 2026
Merged

Badger2350: Update LUTs for nice grays #11671

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1d4131e
add missing frozen modules
bablokb Oct 26, 2026
6cd62a8
updated LUTs for clean grays
bablokb Oct 26, 2026
bc78e1c
removed BusDevice from frozen libs
bablokb Oct 27, 2026
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83 changes: 53 additions & 30 deletions ports/raspberrypi/boards/pimoroni_badger2350/board.c
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Original file line number Diff line number Diff line change
Expand Up @@ -88,29 +88,51 @@ uint8_t _start_sequence[] = {
0x12, 0x80, 0x00, 0x14, // soft reset and wait 20ms
0x11, 0x00, 0x01, 0x03, // Ram data entry mode
0x3c, 0x00, 0x01, 0x03, // border color
0x2c, 0x00, 0x01, 0x28, // Set vcom voltage
0x2c, 0x00, 0x01, 0x20, // Set vcom voltage (Pimoroni: 0x28)
0x03, 0x00, 0x01, 0x17, // Set gate voltage
0x04, 0x00, 0x03, 0x41, 0xae, 0x32, // Set source voltage
0x4e, 0x00, 0x01, 0x00, // ram x count
0x4f, 0x00, 0x02, 0x00, 0x00, // ram y count
0x01, 0x00, 0x03, 0x07, 0x01, 0x00, // set display size
0x3f, 0x00, 0x01, 0x22, // EOPT normal (0x22)
0x32, 0x00, 0x99, // Update waveforms

// offset 44
0x40, 0x68, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // VS L0
0xA0, 0x65, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // VS L1
0xA8, 0x65, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // VS L2
0xAA, 0x65, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // VS L3
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // VS L4

// offset 104
0x02, 0x00, 0x00, 0x05, 0x0A, 0x00, 0x03, // Group0 (with default speed==0)
// offset 111
0x19, 0x19, 0x00, 0x02, 0x00, 0x00, 0x03, // Group1 (with default speed==0)
// offset 118
0x05, 0x0A, 0x00, 0x00, 0x00, 0x00, 0x03, // Group2 (with default speed==0)

// offset 125
// LUT-START: offset 48
// VS rows: only L0-L3 are swapped relative to GxEPD2_4G;
// L1 and L2 stay in place.
// Reason: CircuitPython luma maps 0 L0, 64-127 L2, 128-191 L1, 255 L3.
// GxEPD2 uses L0=white-driver, L3=black-driver
// (opposite of CircuitPython for extremes).
// GxEPD2 L1=lighter-gray, L2=darker-gray
// CircuitPython: L1=mid-bright, L2=mid-dark — same ordering.
// So: swap only L0-L3 (polarity);
// L1 and L2 keep their GxEPD2 positions (gradient preserved).
//
// Note: 0x48: VSH1/GND/VSL/GND alternating — better DC balance than
// 0x60 (VSH1/VSL/GND/GND)

// 5x12 = 60 bytes
// VS L0 (darkest/black) == GxEPD2 L3
0x20, 0x48, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// VS L1 (mid-light) == GxEPD2 L1 (luma 128-191 lighter)
0x08, 0x48, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// VS L2 (mid-dark) == GxEPD2 L2 (luma 64-127 darker)
0x02, 0x48, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// VS L3 (lightest/white) == GxEPD2 L0
0x40, 0x48, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// VS L4 VCOM
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

// 12x7 = 84 (144 total)
// Timing groups — Good Display reference timing
// offset 108: Group0: 10+25 / 3+8 frames activation
0x0A, 0x19, 0x00, 0x03, 0x08, 0x00, 0x00,
// offset 115: Group1: 20+1 / 20+1 frames, RP=0 repeats
0x14, 0x01, 0x00, 0x14, 0x01, 0x00, 0x00,
// offset 122: Group2: 10+3 / 8+25 frames (mirror of G0)
0x0A, 0x03, 0x00, 0x08, 0x19, 0x00, 0x00,

// offset 129
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group3
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group4
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group5
Expand All @@ -120,35 +142,37 @@ uint8_t _start_sequence[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group9
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group10
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Group11
0x44, 0x42, 0x22, 0x22, 0x23, 0x32, 0x00, // Config
0x00, 0x00, // FR, XON

// 12x0.5 = 6, (150 total)
0x22, 0x22, 0x22, 0x22, 0x22, 0x22, // FR
// 3x1 = 3, (153 total)
0x00, 0x00, 0x00, // XON
// LUT-END: offset 201
0x22, 0x00, 0x01, 0xc7, // display update mode

};

const uint8_t _stop_sequence[] = {
0x10, 0x00, 0x01, 0x01 // DSM deep sleep mode 1
0x10, 0x80, 0x01, 0x01, 0x64 // DSM deep sleep mode 1
};

const uint8_t _refresh_sequence[] = {
0x20, 0x00, 0x00 // ADUS
};

// Change update speed. This changes the repeat-count in the LUTs
// Pimoroni uses: 0 == slow ... 3 == fast
// and calculates the LUT repeat count as 3-speed
// Change update speed.

// Pimoroni sets the repeat-count for Group0-Group2 and uses:
// speed=0 == slow ... 3 == fast and calculates the LUT repeat count as 3-speed

// This implementation only changes the repeat-count in the LUT-timing of Group1.
// Default is SPEED=3.

#define SPEED_OFFSET_1 110
#define SPEED_OFFSET_2 117
#define SPEED_OFFSET_3 124
#define RP_OFFSET 121

static mp_obj_t _set_update_speed(mp_obj_t speed_in) {
mp_int_t speed = mp_obj_get_int(speed_in);
uint8_t count = (uint8_t)3 - (uint8_t)(speed & 3);
_start_sequence[SPEED_OFFSET_1] = count;
_start_sequence[SPEED_OFFSET_2] = count;
_start_sequence[SPEED_OFFSET_3] = count;
_start_sequence[RP_OFFSET] = count;
return mp_const_none;
}

Expand Down Expand Up @@ -199,7 +223,6 @@ void board_init(void) {
args.set_current_row_command = 0x4f;
args.write_black_ram_command = 0x24;
args.write_color_ram_command = 0x26;
args.color_bits_inverted = true;
args.refresh_sequence = _refresh_sequence;
args.refresh_sequence_len = sizeof(_refresh_sequence);
args.refresh_time = 1.0;
Expand Down
1 change: 1 addition & 0 deletions ports/raspberrypi/boards/pimoroni_badger2350/mpconfigboard.mk
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Original file line number Diff line number Diff line change
Expand Up @@ -39,3 +39,4 @@ CFLAGS += \
CFLAGS += -DCIRCUITPY_FIRMWARE_SIZE='(1536 * 1024)'

FROZEN_MPY_DIRS += $(TOP)/frozen/circuitpython-pcf85063a
FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_Register
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