416 lines
15 KiB
C
416 lines
15 KiB
C
////////////////////////////////////////////////////
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// TFT_eSPI generic driver functions //
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////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////
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// Global variables
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////////////////////////////////////////////////////////////////////////////////////////
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#if !defined (TFT_PARALLEL_8_BIT)
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// Select the SPI port and board package to use
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#ifdef ARDUINO_ARCH_MBED
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// Arduino RP2040 board package
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MbedSPI spi = MbedSPI(TFT_MISO, TFT_MOSI, TFT_SCLK);
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#else
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// Community RP2040 board package by Earle Philhower
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SPIClass& spi = SPI;
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#endif
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#endif
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#ifdef RP2040_DMA
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uint32_t dma_tx_channel;
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dma_channel_config dma_tx_config;
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#endif
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////////////////////////////////////////////////////////////////////////////////////////
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#if defined (TFT_SDA_READ) && !defined (TFT_PARALLEL_8_BIT)
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////////////////////////////////////////////////////////////////////////////////////////
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/***************************************************************************************
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** Function name: tft_Read_8
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** Description: Bit bashed SPI to read bidirectional SDA line
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***************************************************************************************/
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uint8_t TFT_eSPI::tft_Read_8(void)
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{
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uint8_t ret = 0;
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for (uint8_t i = 0; i < 8; i++) { // read results
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ret <<= 1;
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SCLK_L;
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if (digitalRead(TFT_MOSI)) ret |= 1;
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SCLK_H;
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}
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return ret;
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}
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/***************************************************************************************
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** Function name: beginSDA
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** Description: Detach SPI from pin to permit software SPI
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***************************************************************************************/
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void TFT_eSPI::begin_SDA_Read(void)
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{
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// Release configured SPI port for SDA read
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spi.end();
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}
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/***************************************************************************************
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** Function name: endSDA
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** Description: Attach SPI pins after software SPI
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***************************************************************************************/
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void TFT_eSPI::end_SDA_Read(void)
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{
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// Configure SPI port ready for next TFT access
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spi.begin();
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#endif // #if defined (TFT_SDA_READ)
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////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////
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#if defined (TFT_PARALLEL_8_BIT) // Code for generic (i.e. any) processor
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////////////////////////////////////////////////////////////////////////////////////////
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/***************************************************************************************
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** Function name: pushBlock - for generic processor and parallel display
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** Description: Write a block of pixels of the same colour
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***************************************************************************************/
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void TFT_eSPI::pushBlock(uint16_t color, uint32_t len){
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while (len>1) {tft_Write_32D(color); len-=2;}
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if (len) {tft_Write_16(color);}
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}
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/***************************************************************************************
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** Function name: pushPixels - for gereric processor and parallel display
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** Description: Write a sequence of pixels
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***************************************************************************************/
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void TFT_eSPI::pushPixels(const void* data_in, uint32_t len){
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uint16_t *data = (uint16_t*)data_in;
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if(_swapBytes) {
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while (len>1) {tft_Write_16(*data); data++; tft_Write_16(*data); data++; len -=2;}
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if (len) {tft_Write_16(*data);}
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return;
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}
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while (len>1) {tft_Write_16S(*data); data++; tft_Write_16S(*data); data++; len -=2;}
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if (len) {tft_Write_16S(*data);}
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}
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/***************************************************************************************
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** Function name: GPIO direction control - supports class functions
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** Description: Set parallel bus to INPUT or OUTPUT
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***************************************************************************************/
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void TFT_eSPI::busDir(uint32_t mask, uint8_t mode)
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{
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// mask is unused for generic processor
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// Arduino native functions suited well to a generic driver
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pinMode(TFT_D0, mode);
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pinMode(TFT_D1, mode);
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pinMode(TFT_D2, mode);
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pinMode(TFT_D3, mode);
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pinMode(TFT_D4, mode);
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pinMode(TFT_D5, mode);
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pinMode(TFT_D6, mode);
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pinMode(TFT_D7, mode);
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return;
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}
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/***************************************************************************************
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** Function name: GPIO direction control - supports class functions
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** Description: Faster GPIO pin input/output switch
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***************************************************************************************/
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void TFT_eSPI::gpioMode(uint8_t gpio, uint8_t mode)
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{
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// No fast port based generic approach available
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}
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/***************************************************************************************
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** Function name: read byte - supports class functions
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** Description: Read a byte - parallel bus only
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***************************************************************************************/
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uint8_t TFT_eSPI::readByte(void)
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{
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uint8_t b = 0;
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busDir(0, INPUT);
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digitalWrite(TFT_RD, LOW);
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b |= digitalRead(TFT_D0) << 0;
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b |= digitalRead(TFT_D1) << 1;
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b |= digitalRead(TFT_D2) << 2;
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b |= digitalRead(TFT_D3) << 3;
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b |= digitalRead(TFT_D4) << 4;
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b |= digitalRead(TFT_D5) << 5;
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b |= digitalRead(TFT_D6) << 6;
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b |= digitalRead(TFT_D7) << 7;
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digitalWrite(TFT_RD, HIGH);
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busDir(0, OUTPUT);
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return b;
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#elif defined (RPI_WRITE_STROBE) // For RPi TFT with write strobe
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////////////////////////////////////////////////////////////////////////////////////////
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/***************************************************************************************
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** Function name: pushBlock - for ESP32 or RP2040 RPi TFT
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** Description: Write a block of pixels of the same colour
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***************************************************************************************/
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void TFT_eSPI::pushBlock(uint16_t color, uint32_t len){
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if(len) { tft_Write_16(color); len--; }
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while(len--) {WR_L; WR_H;}
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}
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/***************************************************************************************
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** Function name: pushPixels - for ESP32 or RP2040 RPi TFT
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** Description: Write a sequence of pixels
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***************************************************************************************/
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void TFT_eSPI::pushPixels(const void* data_in, uint32_t len)
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{
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uint16_t *data = (uint16_t*)data_in;
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if (_swapBytes) while ( len-- ) {tft_Write_16S(*data); data++;}
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else while ( len-- ) {tft_Write_16(*data); data++;}
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#elif defined (SPI_18BIT_DRIVER) // SPI 18 bit colour
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////////////////////////////////////////////////////////////////////////////////////////
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/***************************************************************************************
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** Function name: pushBlock - for RP2040 and 3 byte RGB display
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** Description: Write a block of pixels of the same colour
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***************************************************************************************/
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void TFT_eSPI::pushBlock(uint16_t color, uint32_t len)
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{
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uint16_t r = (color & 0xF800)>>8;
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uint16_t g = (color & 0x07E0)>>3;
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uint16_t b = (color & 0x001F)<<3;
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// If more than 32 pixels then change to 16 bit transfers with concatenated pixels
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if (len > 32) {
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uint32_t rg = r<<8 | g;
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uint32_t br = b<<8 | r;
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uint32_t gb = g<<8 | b;
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// Must wait before changing to 16 bit
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while (spi_get_hw(spi0)->sr & SPI_SSPSR_BSY_BITS) {};
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spi_set_format(spi0, 16, (spi_cpol_t)0, (spi_cpha_t)0, SPI_MSB_FIRST);
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while ( len > 1 ) {
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while (!spi_is_writable(spi0)){}; spi_get_hw(spi0)->dr = rg;
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while (!spi_is_writable(spi0)){}; spi_get_hw(spi0)->dr = br;
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while (!spi_is_writable(spi0)){}; spi_get_hw(spi0)->dr = gb;
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len -= 2;
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}
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// Must wait before changing back to 8 bit
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while (spi_get_hw(spi0)->sr & SPI_SSPSR_BSY_BITS) {};
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spi_set_format(spi0, 8, (spi_cpol_t)0, (spi_cpha_t)0, SPI_MSB_FIRST);
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}
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// Mop up the remaining pixels
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while ( len-- ) {tft_Write_8N(r);tft_Write_8N(g);tft_Write_8N(b);}
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}
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/***************************************************************************************
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** Function name: pushPixels - for RP2040 and 3 byte RGB display
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** Description: Write a sequence of pixels
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***************************************************************************************/
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void TFT_eSPI::pushPixels(const void* data_in, uint32_t len){
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uint16_t *data = (uint16_t*)data_in;
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if (_swapBytes) {
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while ( len-- ) {
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uint32_t col = *data++;
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tft_Write_16(col);
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}
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}
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else {
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while ( len-- ) {
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uint32_t col = *data++;
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tft_Write_16S(col);
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#else // Standard SPI 16 bit colour TFT
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////////////////////////////////////////////////////////////////////////////////////////
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/***************************************************************************************
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** Function name: pushBlock - for RP2040
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** Description: Write a block of pixels of the same colour
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***************************************************************************************/
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void TFT_eSPI::pushBlock(uint16_t color, uint32_t len){
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while(len--)
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{
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while (!spi_is_writable(spi0)){};
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spi_get_hw(spi0)->dr = (uint32_t)color;
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}
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}
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/***************************************************************************************
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** Function name: pushPixels - for RP2040
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** Description: Write a sequence of pixels
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***************************************************************************************/
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void TFT_eSPI::pushPixels(const void* data_in, uint32_t len){
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uint16_t *data = (uint16_t*)data_in;
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if (_swapBytes) {
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while(len--)
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{
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while (!spi_is_writable(spi0)){};
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spi_get_hw(spi0)->dr = (uint32_t)(*data++);
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}
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}
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else
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{
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while(len--)
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{
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uint16_t color = *data++;
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color = color >> 8 | color << 8;
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while (!spi_is_writable(spi0)){};
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spi_get_hw(spi0)->dr = (uint32_t)color;
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#endif // End of display interface specific functions
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////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////
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#if defined (RP2040_DMA) && !defined (TFT_PARALLEL_8_BIT) // DMA FUNCTIONS
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////////////////////////////////////////////////////////////////////////////////////////
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/*
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Minimal function set to support DMA:
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uint32_t dma_tx_channel;
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dma_channel_config dma_tx_config;
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*/
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/***************************************************************************************
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** Function name: dmaBusy
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** Description: Check if DMA is busy
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***************************************************************************************/
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bool TFT_eSPI::dmaBusy(void) {
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if (!DMA_Enabled) return false;
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if (dma_channel_is_busy(dma_tx_channel)) return true;
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while (spi_get_hw(spi0)->sr & SPI_SSPSR_BSY_BITS) {};
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spi_set_format(spi0, 16, (spi_cpol_t)0, (spi_cpha_t)0, SPI_MSB_FIRST);
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return false;
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}
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/***************************************************************************************
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** Function name: dmaWait
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** Description: Wait until DMA is over (blocking!)
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***************************************************************************************/
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void TFT_eSPI::dmaWait(void)
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{
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while (dma_channel_is_busy(dma_tx_channel));
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while (spi_get_hw(spi0)->sr & SPI_SSPSR_BSY_BITS) {};
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spi_set_format(spi0, 16, (spi_cpol_t)0, (spi_cpha_t)0, SPI_MSB_FIRST);
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}
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/***************************************************************************************
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** Function name: pushPixelsDMA
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** Description: Push pixels to TFT
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***************************************************************************************/
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void TFT_eSPI::pushPixelsDMA(uint16_t* image, uint32_t len)
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{
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if ((len == 0) || (!DMA_Enabled)) return;
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dmaWait();
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channel_config_set_bswap(&dma_tx_config, !_swapBytes);
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dma_channel_configure(dma_tx_channel, &dma_tx_config, &spi_get_hw(spi0)->dr, (uint16_t*)image, len, true);
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}
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/***************************************************************************************
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** Function name: pushImageDMA
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** Description: Push image to a window
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***************************************************************************************/
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// This will clip to the viewport
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void TFT_eSPI::pushImageDMA(int32_t x, int32_t y, int32_t w, int32_t h, uint16_t* image, uint16_t* buffer)
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{
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if ((x >= _vpW) || (y >= _vpH) || (!DMA_Enabled)) return;
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int32_t dx = 0;
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int32_t dy = 0;
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int32_t dw = w;
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int32_t dh = h;
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if (x < _vpX) { dx = _vpX - x; dw -= dx; x = _vpX; }
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if (y < _vpY) { dy = _vpY - y; dh -= dy; y = _vpY; }
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if ((x + dw) > _vpW ) dw = _vpW - x;
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if ((y + dh) > _vpH ) dh = _vpH - y;
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if (dw < 1 || dh < 1) return;
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uint32_t len = dw*dh;
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if (buffer == nullptr) {
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buffer = image;
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dmaWait();
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}
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// If image is clipped, copy pixels into a contiguous block
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if ( (dw != w) || (dh != h) ) {
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for (int32_t yb = 0; yb < dh; yb++) {
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memcpy((uint8_t*) (buffer + yb * dw), (uint8_t*) (image + dx + w * (yb + dy)), dw << 1);
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}
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}
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// else, if a buffer pointer has been provided copy whole image to the buffer
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else if (buffer != image || _swapBytes) {
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memcpy(buffer, image, len*2);
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}
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dmaWait(); // In case we did not wait earlier
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setAddrWindow(x, y, dw, dh);
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channel_config_set_bswap(&dma_tx_config, !_swapBytes);
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dma_channel_configure(dma_tx_channel, &dma_tx_config, &spi_get_hw(spi0)->dr, (uint16_t*)buffer, len, true);
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}
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/***************************************************************************************
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** Function name: initDMA
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** Description: Initialise the DMA engine - returns true if init OK
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***************************************************************************************/
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bool TFT_eSPI::initDMA(bool ctrl_cs)
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{
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if (DMA_Enabled) return false;
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dma_tx_channel = dma_claim_unused_channel(true);
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dma_tx_config = dma_channel_get_default_config(dma_tx_channel);
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channel_config_set_transfer_data_size(&dma_tx_config, DMA_SIZE_16);
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channel_config_set_dreq(&dma_tx_config, spi_get_index(spi0) ? DREQ_SPI1_TX : DREQ_SPI0_TX);
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DMA_Enabled = true;
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return true;
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}
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/***************************************************************************************
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** Function name: deInitDMA
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** Description: Disconnect the DMA engine from SPI
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***************************************************************************************/
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void TFT_eSPI::deInitDMA(void)
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{
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if (!DMA_Enabled) return;
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dma_channel_unclaim(dma_tx_channel);
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DMA_Enabled = false;
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}
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////////////////////////////////////////////////////////////////////////////////////////
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#endif // End of DMA FUNCTIONS
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////////////////////////////////////////////////////////////////////////////////////////
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