diff --git a/src/GxEPD2_EPD.cpp b/src/GxEPD2_EPD.cpp
index 8df8bef..91d7f49 100644
--- a/src/GxEPD2_EPD.cpp
+++ b/src/GxEPD2_EPD.cpp
@@ -19,9 +19,9 @@
GxEPD2_EPD::GxEPD2_EPD(int16_t cs, int16_t dc, int16_t rst, int16_t busy, int16_t busy_level, uint32_t busy_timeout,
uint16_t w, uint16_t h, GxEPD2::Panel p, bool c, bool pu, bool fpu) :
- WIDTH(w), HEIGHT(h), panel(p), hasColor(c), hasPartialUpdate(pu), hasFastPartialUpdate(fpu),
+ WIDTH(w), HEIGHT(h), panel(p), hasColor(c), hasPartialUpdate(pu), hasFastPartialUpdate(fpu), _sck(-1), _mosi(-1),
_cs(cs), _dc(dc), _rst(rst), _busy(busy), _busy_level(busy_level), _busy_timeout(busy_timeout), _diag_enabled(false),
- _pSPIx(&SPI), _spi_settings(4000000, MSBFIRST, SPI_MODE0)
+ _spi_settings(4000000, MSBFIRST, SPI_MODE0)
{
_initial_write = true;
_initial_refresh = true;
@@ -71,27 +71,30 @@ void GxEPD2_EPD::init(uint32_t serial_diag_bitrate, bool initial, uint16_t reset
{
pinMode(_busy, INPUT);
}
- _pSPIx->begin();
- if (_busy == MISO) // may be overridden
- {
- pinMode(_busy, INPUT);
- }
- if (_dc == MISO) // may be overridden, TTGO T5 V2.66
- {
- pinMode(_dc, OUTPUT);
- }
- if (_cs == MISO) // may be overridden
+ if (_sck < 0) SPI.begin();
+}
+
+void GxEPD2_EPD::init(int16_t sck, int16_t mosi, uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration, bool pulldown_rst_mode)
+{
+ if ((sck >= 0) && (mosi >= 0))
{
- pinMode(_cs, INPUT);
- }
+ _sck = sck;
+ _mosi = mosi;
+ digitalWrite(_sck, LOW);
+ digitalWrite(_mosi, LOW);
+ pinMode(_sck, OUTPUT);
+ pinMode(_mosi, OUTPUT);
+ } else _sck = -1;
+ init(serial_diag_bitrate, initial, reset_duration, pulldown_rst_mode);
}
void GxEPD2_EPD::end()
{
- _pSPIx->end();
if (_cs >= 0) pinMode(_cs, INPUT);
if (_dc >= 0) pinMode(_dc, INPUT);
if (_rst >= 0) pinMode(_rst, INPUT);
+ if (_sck >= 0) pinMode(_sck, INPUT);
+ if (_mosi >= 0) pinMode(_mosi, INPUT);
}
void GxEPD2_EPD::setBusyCallback(void (*busyCallback)(const void*), const void* busy_callback_parameter)
@@ -100,12 +103,6 @@ void GxEPD2_EPD::setBusyCallback(void (*busyCallback)(const void*), const void*
_busy_callback_parameter = busy_callback_parameter;
}
-void GxEPD2_EPD::selectSPI(SPIClass& spi, SPISettings spi_settings)
-{
- _pSPIx = &spi;
- _spi_settings = spi_settings;
-}
-
void GxEPD2_EPD::_reset()
{
if (_rst >= 0)
@@ -174,115 +171,201 @@ void GxEPD2_EPD::_waitWhileBusy(const char* comment, uint16_t busy_time)
void GxEPD2_EPD::_writeCommand(uint8_t c)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_dc >= 0) digitalWrite(_dc, LOW);
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(c);
+ _spi_write(c);
if (_cs >= 0) digitalWrite(_cs, HIGH);
if (_dc >= 0) digitalWrite(_dc, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeData(uint8_t d)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(d);
+ _spi_write(d);
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeData(const uint8_t* data, uint16_t n)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_cs >= 0) digitalWrite(_cs, LOW);
- for (uint16_t i = 0; i < n; i++)
+ for (uint8_t i = 0; i < n; i++)
{
- _pSPIx->transfer(*data++);
+ _spi_write(*data++);
}
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeDataPGM(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_cs >= 0) digitalWrite(_cs, LOW);
- for (uint16_t i = 0; i < n; i++)
+ for (uint8_t i = 0; i < n; i++)
{
- _pSPIx->transfer(pgm_read_byte(&*data++));
+ _spi_write(pgm_read_byte(&*data++));
}
while (fill_with_zeroes > 0)
{
- _pSPIx->transfer(0x00);
+ _spi_write(0x00);
fill_with_zeroes--;
}
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeDataPGM_sCS(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
for (uint8_t i = 0; i < n; i++)
{
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(pgm_read_byte(&*data++));
+ _spi_write(pgm_read_byte(&*data++));
if (_cs >= 0) digitalWrite(_cs, HIGH);
}
while (fill_with_zeroes > 0)
{
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(0x00);
+ _spi_write(0x00);
fill_with_zeroes--;
if (_cs >= 0) digitalWrite(_cs, HIGH);
}
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeCommandData(const uint8_t* pCommandData, uint8_t datalen)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_dc >= 0) digitalWrite(_dc, LOW);
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(*pCommandData++);
+ _spi_write(*pCommandData++);
if (_dc >= 0) digitalWrite(_dc, HIGH);
for (uint8_t i = 0; i < datalen - 1; i++) // sub the command
{
- _pSPIx->transfer(*pCommandData++);
+ _spi_write(*pCommandData++);
}
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_writeCommandDataPGM(const uint8_t* pCommandData, uint8_t datalen)
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_dc >= 0) digitalWrite(_dc, LOW);
if (_cs >= 0) digitalWrite(_cs, LOW);
- _pSPIx->transfer(pgm_read_byte(&*pCommandData++));
+ _spi_write(pgm_read_byte(&*pCommandData++));
if (_dc >= 0) digitalWrite(_dc, HIGH);
for (uint8_t i = 0; i < datalen - 1; i++) // sub the command
{
- _pSPIx->transfer(pgm_read_byte(&*pCommandData++));
+ _spi_write(pgm_read_byte(&*pCommandData++));
}
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
}
void GxEPD2_EPD::_startTransfer()
{
- _pSPIx->beginTransaction(_spi_settings);
+ _beginTransaction(_spi_settings);
if (_cs >= 0) digitalWrite(_cs, LOW);
}
void GxEPD2_EPD::_transfer(uint8_t value)
{
- _pSPIx->transfer(value);
+ _spi_write(value);
}
void GxEPD2_EPD::_endTransfer()
{
if (_cs >= 0) digitalWrite(_cs, HIGH);
- _pSPIx->endTransaction();
+ _endTransaction();
+}
+
+void GxEPD2_EPD::_beginTransaction(const SPISettings& settings)
+{
+ if (_sck < 0) SPI.beginTransaction(settings);
+}
+
+void GxEPD2_EPD::_spi_write(uint8_t data)
+{
+ if (_sck < 0) SPI.transfer(data);
+ else
+ {
+#if defined (ESP8266)
+ yield();
+#endif
+ for (int i = 0; i < 8; i++)
+ {
+ digitalWrite(_mosi, (data & 0x80) ? HIGH : LOW);
+ data <<= 1;
+ digitalWrite(_sck, HIGH);
+ digitalWrite(_sck, LOW);
+ }
+ }
+}
+
+void GxEPD2_EPD::_endTransaction()
+{
+ if (_sck < 0) SPI.endTransaction();
+}
+
+uint8_t GxEPD2_EPD::_readData()
+{
+ uint8_t data = 0;
+ _beginTransaction(_spi_settings);
+ if (_cs >= 0) digitalWrite(_cs, LOW);
+ if (_sck < 0)
+ {
+ data = SPI.transfer(0);
+ }
+ else
+ {
+ pinMode(_mosi, INPUT);
+ for (int i = 0; i < 8; i++)
+ {
+ data <<= 1;
+ digitalWrite(_sck, HIGH);
+ data |= digitalRead(_mosi);
+ digitalWrite(_sck, LOW);
+ }
+ pinMode(_mosi, OUTPUT);
+ }
+ if (_cs >= 0) digitalWrite(_cs, HIGH);
+ _endTransaction();
+ return data;
+}
+
+void GxEPD2_EPD::_readData(uint8_t* data, uint16_t n)
+{
+ _beginTransaction(_spi_settings);
+ if (_cs >= 0) digitalWrite(_cs, LOW);
+ if (_sck < 0)
+ {
+ for (uint8_t i = 0; i < n; i++)
+ {
+ *data++ = SPI.transfer(0);
+ }
+ }
+ else
+ {
+ pinMode(_mosi, INPUT);
+ for (uint8_t i = 0; i < n; i++)
+ {
+ *data = 0;
+ for (int i = 0; i < 8; i++)
+ {
+ *data <<= 1;
+ digitalWrite(_sck, HIGH);
+ *data |= digitalRead(_mosi);
+ digitalWrite(_sck, LOW);
+ }
+ data++;
+ }
+ pinMode(_mosi, OUTPUT);
+ }
+ if (_cs >= 0) digitalWrite(_cs, HIGH);
+ _endTransaction();
}
diff --git a/src/GxEPD2_EPD.h b/src/GxEPD2_EPD.h
index 34c1145..c480b7d 100644
--- a/src/GxEPD2_EPD.h
+++ b/src/GxEPD2_EPD.h
@@ -8,6 +8,10 @@
// Version: see library.properties
//
// Library: https://github.com/ZinggJM/GxEPD2
+// To use SW SPI with GxEPD2:
+// add the special call to the added init method BEFORE the normal init method:
+// display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+// display.init(115200); // needed to init upper level
#ifndef _GxEPD2_EPD_H_
#define _GxEPD2_EPD_H_
@@ -35,6 +39,7 @@ class GxEPD2_EPD
uint16_t w, uint16_t h, GxEPD2::Panel p, bool c, bool pu, bool fpu);
virtual void init(uint32_t serial_diag_bitrate = 0); // serial_diag_bitrate = 0 : disabled
virtual void init(uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration = 10, bool pulldown_rst_mode = false);
+ virtual void init(int16_t sck, int16_t mosi, uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration = 20, bool pulldown_rst_mode = false);
virtual void end(); // release SPI and control pins
// Support for Bitmaps (Sprites) to Controller Buffer and to Screen
virtual void clearScreen(uint8_t value) = 0; // init controller memory and screen (default white)
@@ -97,7 +102,6 @@ class GxEPD2_EPD
{
return (a > b ? a : b);
};
- void selectSPI(SPIClass& spi, SPISettings spi_settings);
protected:
void _reset();
void _waitWhileBusy(const char* comment = 0, uint16_t busy_time = 5000);
@@ -111,17 +115,22 @@ class GxEPD2_EPD
void _startTransfer();
void _transfer(uint8_t value);
void _endTransfer();
+ void _beginTransaction(const SPISettings& settings);
+ void _spi_write(uint8_t data);
+ void _endTransaction();
+ public:
+ uint8_t _readData();
+ void _readData(uint8_t* data, uint16_t n);
protected:
- int16_t _cs, _dc, _rst, _busy, _busy_level;
+ int16_t _cs, _dc, _rst, _busy, _busy_level, _sck, _mosi;;
uint32_t _busy_timeout;
bool _diag_enabled, _pulldown_rst_mode;
- SPIClass* _pSPIx;
SPISettings _spi_settings;
bool _initial_write, _initial_refresh;
bool _power_is_on, _using_partial_mode, _hibernating;
bool _init_display_done;
uint16_t _reset_duration;
- void (*_busy_callback)(const void*);
+ void (*_busy_callback)(const void*);
const void* _busy_callback_parameter;
};