Minor changes
* Fix double buffer example * Remove the I2S user clock config for simplicity - ESP32 turns out to be massively limited anyway to 20Mhz...
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58abc5f2fb
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4 changed files with 56 additions and 45 deletions
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@ -100,11 +100,11 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
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Serial.println(F("DMA memory blocks available before any malloc's: "));
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heap_caps_print_heap_info(MALLOC_CAP_DMA);
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Serial.println(F("******************************************************************"));
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Serial.printf_P(PSTR("We're going to need %d bytes of SRAM just for the frame buffer(s).\r\n"), _frame_buffer_memory_required);
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Serial.printf_P(PSTR("The total amount of DMA capable SRAM memory is %d bytes.\r\n"), heap_caps_get_free_size(MALLOC_CAP_DMA));
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Serial.printf_P(PSTR("Largest DMA capable SRAM memory block is %d bytes.\r\n"), heap_caps_get_largest_free_block(MALLOC_CAP_DMA));
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Serial.println(F("******************************************************************"));
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#endif
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// Can we potentially fit the framebuffer into the DMA capable memory that's available?
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@ -180,11 +180,16 @@ bool MatrixPanel_I2S_DMA::allocateDMAmemory()
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Serial.printf_P(PSTR("Raised lsbMsbTransitionBit to %d/%d to fit in remaining RAM\r\n"), lsbMsbTransitionBit, PIXEL_COLOR_DEPTH_BITS - 1);
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//#define IGNORE_REFRESH_RATE 1
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#ifndef IGNORE_REFRESH_RATE
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#if SERIAL_DEBUG
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Serial.printf_P(PSTR("Requested I2S clock / gpio output frequency is %d Mhz\r\n"), ESP32_I2S_CLOCK_SPEED/1000000);
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#endif
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// calculate the lowest LSBMSB_TRANSITION_BIT value that will fit in memory that will meet or exceed the configured refresh rate
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while(1) {
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int psPerClock = 1000000000000UL/m_cfg.i2sspeed;
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int psPerClock = 1000000000000UL/ESP32_I2S_CLOCK_SPEED;
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int nsPerLatch = ((PIXELS_PER_ROW + CLKS_DURING_LATCH) * psPerClock) / 1000;
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// add time to shift out LSBs + LSB-MSB transition bit - this ignores fractions...
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@ -416,7 +421,7 @@ void MatrixPanel_I2S_DMA::configureDMA(const HUB75_I2S_CFG& _cfg)
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i2s_parallel_config_t cfg={
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.gpio_bus={_cfg.gpio.r1, _cfg.gpio.g1, _cfg.gpio.b1, _cfg.gpio.r2, _cfg.gpio.g2, _cfg.gpio.b2, _cfg.gpio.lat, _cfg.gpio.oe, _cfg.gpio.a, _cfg.gpio.b, _cfg.gpio.c, _cfg.gpio.d, _cfg.gpio.e, -1, -1, -1},
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.gpio_clk=_cfg.gpio.clk,
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.clkspeed_hz=_cfg.i2sspeed, //ESP32_I2S_CLOCK_SPEED, formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2. Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
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.clkspeed_hz=ESP32_I2S_CLOCK_SPEED, //ESP32_I2S_CLOCK_SPEED, formula used is 80000000L/(cfg->clkspeed_hz + 1), must result in >=2. Acceptable values 26.67MHz, 20MHz, 16MHz, 13.34MHz...
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.bits=ESP32_I2S_DMA_MODE, //ESP32_I2S_DMA_MODE,
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.bufa=0,
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.bufb=0,
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@ -230,11 +230,6 @@ struct HUB75_I2S_CFG {
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*/
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enum shift_driver {SHIFT=0, FM6124, FM6126A, ICN2038S};
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/**
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* I2S clock speed selector
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*/
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enum clk_speed {HZ_10M=10000000, HZ_13340K=13340000, HZ_16M=16000000, HZ_20M=20000000, HZ_26670K=26670000};
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// Structure Variables
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// physical width of a single matrix panel module (in pixels, usually it is 64 ;) )
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@ -252,8 +247,7 @@ struct HUB75_I2S_CFG {
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// Matrix driver chip type - default is a plain shift register
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shift_driver driver;
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// I2S clock speed
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clk_speed i2sspeed;
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// use DMA double buffer (twice as much RAM required)
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bool double_buff;
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// How many clock cycles to blank OE before/after LAT signal change, default is 1 clock
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@ -271,13 +265,12 @@ struct HUB75_I2S_CFG {
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LAT_PIN_DEFAULT, OE_PIN_DEFAULT, CLK_PIN_DEFAULT },
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shift_driver _drv = SHIFT,
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bool _dbuff = false,
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clk_speed _i2sspeed = HZ_10M,
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uint16_t _latblk = 1
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) : mx_width(_w),
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mx_height(_h),
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chain_length(_chain),
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gpio(_pinmap),
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driver(_drv), i2sspeed(_i2sspeed),
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driver(_drv),
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double_buff(_dbuff),
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latch_blanking(_latblk) {}
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}; // end of structure HUB75_I2S_CFG
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@ -196,12 +196,18 @@ void i2s_parallel_setup_without_malloc(i2s_dev_t *dev, const i2s_parallel_config
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else
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dev->sample_rate_conf.tx_bck_div_num=1; // datasheet says this must be 2 or greater (but 1 seems to work)
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dev->clkm_conf.val=0;
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dev->clkm_conf.clka_en=0;
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dev->clkm_conf.clkm_div_a=63;
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dev->clkm_conf.clkm_div_b=63;
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dev->clkm_conf.val=0; // Clear the clkm_conf struct
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dev->clkm_conf.clka_en=0; // Use the 160mhz system clock (PLL_D2_CLK) when '0'
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dev->clkm_conf.clkm_div_a=1; // Page 310 of Technical Reference Manual - Clock denominator
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dev->clkm_conf.clkm_div_b=1; // Page 310 of Technical Reference Manual - Clock numerator
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//We ignore the possibility for fractional division here, clkspeed_hz must round up for a fractional clock speed, must result in >= 2
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dev->clkm_conf.clkm_div_num=80000000L/(cfg->clkspeed_hz + 1);
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// It's confusing, but the max output the ESP32 can pump out when using I2S *parallel* output is 20Mhz.
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// https://easyvolts.com/2018/08/14/esp32-40msps-oscilloscope-project-is-closed-and-here-is-why/
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// and https://github.com/espressif/esp-idf/issues/2251
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// Igor - "Frequencies above 20MHz do not work in I2S mode."
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dev->clkm_conf.clkm_div_num=80000000L/(cfg->clkspeed_hz + 1); // combination of this and tx_bck_div_num
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dev->fifo_conf.val=0;
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dev->fifo_conf.rx_fifo_mod_force_en=1;
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@ -10,8 +10,8 @@
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* for different resolutions / panel chain lengths within the sketch 'setup()'.
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*
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*/
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MatrixPanel_I2S_DMA display(true); // Note the TRUE -> Turns of secondary buffer - "double buffering"!
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// Double buffering is not enabled by default with the library.
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MatrixPanel_I2S_DMA *display = nullptr;
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const byte row0 = 2+0*10;
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const byte row1 = 2+1*10;
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@ -26,30 +26,37 @@ void setup()
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Serial.println("...Starting Display");
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display.begin(); // setup display with pins as per defined in the library
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display.setTextColor(display.color565(128, 128, 128));
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HUB75_I2S_CFG mxconfig;
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mxconfig.double_buff = true; // Turn of double buffer
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// OK, now we can create our matrix object
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display = new MatrixPanel_I2S_DMA(mxconfig);
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display->begin(); // setup display with pins as per defined in the library
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display->setTextColor(display->color565(255, 255, 255));
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// Buffer 0 test
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display.fillScreen(display.color565(128, 0, 0));
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display.setCursor(3, row0);
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display.print(F("Buffer 0"));
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display.setCursor(3, row1);
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display.print(F(" Buffer 0"));
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display->fillScreen(display->color565(128, 0, 0));
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display->setCursor(3, row0);
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display->print(F("Buffer 0"));
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display->setCursor(3, row1);
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display->print(F(" Buffer 0"));
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Serial.println("Wrote to to Buffer 0");
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display.showDMABuffer();
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display->showDMABuffer();
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delay(1500);
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// Buffer 1 test
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display.flipDMABuffer();
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display.fillScreen(display.color565(0, 128, 0)); // shouldn't see this
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display.setCursor(3, row0);
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display.print(F("Buffer 1"));
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display.setCursor(3, row2);
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display.print(F(" Buffer 1"));
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display->flipDMABuffer();
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display->fillScreen(display->color565(0, 128, 0)); // shouldn't see this
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display->setCursor(3, row0);
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display->print(F("Buffer 1"));
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display->setCursor(3, row2);
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display->print(F(" Buffer 1"));
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Serial.println("Wrote to to Buffer 1");
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display.showDMABuffer();
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display->showDMABuffer();
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delay(1500);
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}
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@ -57,31 +64,31 @@ void setup()
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void loop() {
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// Flip the back buffer
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display.flipDMABuffer();
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display->flipDMABuffer();
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// Write: Set bottow row to black
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for (int y=20;y<MATRIX_HEIGHT; y++)
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for (int x=0;x<MATRIX_WIDTH; x++)
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{
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display.drawPixelRGB888( x, y, 0, 0, 0);
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display->drawPixelRGB888( x, y, 0, 0, 0);
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}
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// Write: Set bottom row to blue (this is what should show)
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for (int y=20;y<MATRIX_HEIGHT; y++)
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for (int x=0;x<MATRIX_WIDTH; x++)
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{
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display.drawPixelRGB888( x, y, 0, 0, 64);
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display->drawPixelRGB888( x, y, 0, 0, 64);
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}
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// Now show this back buffer
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display.showDMABuffer();
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display->showDMABuffer();
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delay(1000);
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// Flip back buffer
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display.flipDMABuffer();
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display->flipDMABuffer();
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// Show this buffer
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display.showDMABuffer();
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display->showDMABuffer();
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delay(1000);
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}
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