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SoftSPI bit banging (credits to the unknown creator)

Update README.md

add Setup303_CYD

Update User_Setup.h

Referal to User_Setup303
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@ggaljoen
ggaljoen committed Feb 22, 2024
1 parent 7c27c96 commit 0cc0479
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Showing 4 changed files with 127 additions and 4 deletions.
79 changes: 79 additions & 0 deletions Extensions/Touch.cpp
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Expand Up @@ -53,13 +53,68 @@ inline void TFT_eSPI::end_touch_read_write(void){
void TFT_eSPI::spi_begin_touch() {begin_touch_read_write();}
void TFT_eSPI::spi_end_touch() { end_touch_read_write();}

/***************************************************************************************
** Function name: Sspixfer
** Description: software SPI transfer.
***************************************************************************************/
uint16_t SPIdout;
uint16_t SPIdin;

void Sspixfer (uint16_t dout) // Exchange 8 bits of data over SPI
{
// uint16_t tmp; // Data in
uint16_t SPImask = 0x80; // Set bit mask
SPIdout = dout; // Set data to go
for (uint8_t lpcnt = 0; lpcnt < 8; lpcnt ++) // Do 8 bits
{
digitalWrite (TOUCH_MOSI, ((SPIdout & SPImask) ? HIGH:LOW)); // Set up data out
SPImask = (SPImask >> 1); // Mask for next bit
digitalWrite(TOUCH_CLK,1); // CLK = 1
// tmp = (tmp << 1); // Shift existing data along
SPIdin = (SPIdin << 1); // Shift existing data along
digitalWrite(TOUCH_CLK,0); // CLK = 0
ets_delay_us(1); // Delay
// tmp |= digitalRead(TOUCH_MISO); // Shift data in
SPIdin |= digitalRead(TOUCH_MISO); // Shift data in
} // Go round again
} // All done

/***************************************************************************************
** Function name: getTouchRaw
** Description: read raw touch position. Always returns true.
***************************************************************************************/
uint8_t TFT_eSPI::getTouchRaw(uint16_t *x, uint16_t *y){
uint16_t tmp;

#ifdef SOFTSPI

digitalWrite(TOUCH_CS,0);
Sspixfer(0xD0); // Start new YP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0xD0); // Read last 8 bits and start new YP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0xD0); // Read last 8 bits and start new YP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0xD0); // Read last 8 bits and start new YP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0x90); // Read last 8 bits and start new XP conversion

*x = SPIdin >>4; // Transfer and re-align data

Sspixfer(0); // Read first 8 bits
Sspixfer(0x90); // Read last 8 bits and start new XP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0x90); // Read last 8 bits and start new XP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0x90); // Read last 8 bits and start new XP conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0); // Read last 8 bits

*y = SPIdin >>4; // Transfer and re-align data
digitalWrite(TOUCH_CS,1);

#else

begin_touch_read_write();

// Start YP sample request for x position, read 4 times and keep last sample
Expand Down Expand Up @@ -93,6 +148,8 @@ uint8_t TFT_eSPI::getTouchRaw(uint16_t *x, uint16_t *y){

end_touch_read_write();

#endif

return true;
}

Expand All @@ -101,16 +158,38 @@ uint8_t TFT_eSPI::getTouchRaw(uint16_t *x, uint16_t *y){
** Description: read raw pressure on touchpad and return Z value.
***************************************************************************************/
uint16_t TFT_eSPI::getTouchRawZ(void){
#if defined SOFTSPI

int16_t tz = 0xFFF;

digitalWrite(TOUCH_CS,0);
Sspixfer(0xb0); // Start new Z1 conversion
Sspixfer(0); // Read first 8 bits
Sspixfer(0xc0); // Read last 8 bits and start Z2 conversion
tz += (SPIdin >>4);

Sspixfer(0); // Read first 8 bits
Sspixfer(0); // Read last 8 bits
tz -= (SPIdin >>4);

digitalWrite(TOUCH_CS,1);

// tz += Sspixfer16(0xc0) >> 3; // Read Z1 and start Z2 conversion
// tz -= Sspixfer16(0x00) >> 3; // Read Z2

#else

begin_touch_read_write();

// Z sample request
int16_t tz = 0xFFF;

spi.transfer(0xb0); // Start new Z1 conversion
tz += spi.transfer16(0xc0) >> 3; // Read Z1 and start Z2 conversion
tz -= spi.transfer16(0x00) >> 3; // Read Z2

end_touch_read_write();
#endif

if (tz == 4095) tz = 0;

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3 changes: 3 additions & 0 deletions README.md
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@@ -1,3 +1,6 @@
CYD version now in: User_Setups\Setup303_CYD_ESP32-2432S028R.h
SoftSPI applied as found @ https://github.com/VaAndCob/ESP32-OBD2-Gauge.git

A ["Discussions"](https://github.com/Bodmer/TFT_eSPI/discussions) facility has been added for Q&A etc. Use the ["Issues"](https://github.com/Bodmer/TFT_eSPI/issues) tab only for problems with the library. Thanks!
# News
1. The Create_font Processing sketch has been updated to automatically create a complete C header file. The automatic opening of the font folder can also be disabled within the Processing sketch. (Thanks to Pierre-Loup Martin).
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14 changes: 10 additions & 4 deletions TFT_eSPI.cpp
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Expand Up @@ -533,10 +533,16 @@ TFT_eSPI::TFT_eSPI(int16_t w, int16_t h)
void TFT_eSPI::initBus(void) {

#ifdef TFT_CS
if (TFT_CS >= 0) {
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH); // Chip select high (inactive)
}
#if defined SOFTSPI // CYD changes
pinMode(TOUCH_MOSI, OUTPUT); // CYD changes
pinMode(TOUCH_MISO, INPUT); // CYD changes
pinMode(TOUCH_CLK, OUTPUT); // CYD changes
#else // CYD changes
if (TFT_CS >= 0) {
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH); // Chip select high (inactive)
}
#endif // CYD changes
#endif

// Configure chip select for touchscreen controller if present
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35 changes: 35 additions & 0 deletions User_Setups/Setup303_CYD_ESP32-2432S028R.h
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@@ -0,0 +1,35 @@
// See SetupX_Template.h for all options available
#define USER_SETUP_ID 303

#define ILI9341_2_DRIVER

#define TFT_BL 21
#define TFT_BACKLIGHT_ON HIGH
#define TFT_MOSI 13
#define TFT_SCLK 14
#define TFT_CS 15
#define TFT_DC 2
#define TFT_RST -1

#define SOFTSPI // Uncomment for software SPI
#define TOUCH_CS 33 // Chip select pin (T_CS) of touch screen
#define TOUCH_MOSI 32 // Separate Touch SoftSPI bus
#define TOUCH_MISO 39 // Separate Touch SoftSPI bus
#define TOUCH_CLK 25 // Separate Touch SoftSPI bus

#define LOAD_GLCD // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2 // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4 // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6 // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7 // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:-.
#define LOAD_FONT8 // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
#define LOAD_GFXFF // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts
#define SMOOTH_FONT

#define SPI_FREQUENCY 40000000

#define SPI_READ_FREQUENCY 1600000

#define SPI_TOUCH_FREQUENCY 2500000

// #define SUPPORT_TRANSACTIONS

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