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Fix TPS chip not powering down on Inkplate models #134

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Merged
jonasniesner merged 1 commit into from
Jul 30, 2026
Merged

Fix TPS chip not powering down on Inkplate models #134

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17 changes: 16 additions & 1 deletion src/display_fastepd.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,9 @@ extern void it8951LoadImgAreaStart(FASTEPDSTATE* pState, uint16_t endian, uint16
extern void it8951WriteCmdCode(FASTEPDSTATE* pState, uint16_t cmd);
extern void it8951DisplayArea1Bit(FASTEPDSTATE* pState, uint16_t x, uint16_t y, uint16_t w, uint16_t h,
uint16_t mode, uint8_t bg_gray, uint8_t fg_gray);
// FastEPD's cached PCAL6416A write
extern void bbepPCALDigitalWrite(uint8_t pin, uint8_t value);
static void fastepd_inkplate_wakeup_off(void);

class OdFastEPD : public FASTEPD {
public:
Expand Down Expand Up @@ -278,6 +281,7 @@ bool fastepd_wait_refresh(int timeout_sec) {

void fastepd_sleep_after_refresh(void) {
g_epd.einkPower(0);
fastepd_inkplate_wakeup_off();
g_epd.deInit();
}

Expand Down Expand Up @@ -336,8 +340,19 @@ void fastepd_direct_refresh(int refresh_mode) {
g_epd.backupPlane();
}

// FastEPD's Inkplate einkPower(0) drops the rails but leaves the TPS65186 WAKEUP
// asserted, so the PMIC stays awake and the board idles high.
static void fastepd_inkplate_wakeup_off(void) {
if (globalConfig.display_count < 1) return;
const uint16_t ic = globalConfig.displays[0].panel_ic_type;
if (ic != OD_PANEL_IC_INKPLATE5V2_1280X720 && ic != OD_PANEL_IC_INKPLATE10_1200X825) return;
FASTEPDSTATE* st = g_epd.state();
if (st) bbepPCALDigitalWrite(st->panelDef.ioShiftSTR, 0); // WAKEUP low -> PMIC shutdown
}

void fastepd_direct_sleep(void) {
g_epd.einkPower(0);
fastepd_inkplate_wakeup_off();
g_epd.deInit();
}

Expand Down Expand Up @@ -414,4 +429,4 @@ bool fastepd_partial_refresh(int refresh_mode) {
return true;
}

#endif
#endif
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