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aiie/teensy/RA8875_t4.cpp

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#include "RA8875_t4.h"
#include "RA8875_registers.h"
// Discussion about DMA channels: http://forum.pjrc.com/threads/25778-Could-there-be-something-like-an-ISR-template-function/page3
// And these libraries use it:
// https://github.com/PaulStoffregen/Audio
// https://github.com/PaulStoffregen/OctoWS2811
// https://github.com/pedvide/ADC
// https://github.com/duff2013/SerialEvent
// https://github.com/pixelmatix/SmartMatrix
// https://github.com/crteensy/DmaSpi <-- DmaSpi has adopted this scheme
//
/* The ST7735 and ILI9341 have both been modified in the Teensyduino
* distribution to use DMA + SPI the way that I want to do this here.
* The major differences here:
* - Both the 7735 and 9341 use 16-bit transfers. Since this has a
* substantially larger framebuffer that doesn't fit in the DMAMEM
* region, that won't work -- so I'm using 8-bpp mode.
* - Both the ILI9341 and ST7735 have a D/C pin to tell the display
* if the data being sent is a command or is data. The 8875 does
* not have a D/C pin.
* - Both the 7735 and 9341 drivers have a lot of #ifdef overhead
* to support multiple different Teensys. I'm targeting the 4.1
* so I'm not including any of that abstraction.
* - The RA8875 driver supports multiple different pixel-size
* displays (and vendors' interfaces). Aiie only supports 800x480
* using the Adafruit RA8875 display module.
*
* The initialization sets us to 8bpp color mode, so that 800*480 fits
* within 512k of RAM (800*480 bytes = 375k; if this were 16bpp, then
* it would overflow by 238k.) This is important because, if I
* understand it rightly, only one of the 512k banks on the Teensy is
* coupled to DMA. (The other bank of memory is tightly coupled to the
* processor for faster access.) It's possible to further reduce our
* memory footprint if necessary by just caching the Apple's display
* size of 560x240 (reducing it to about 132k) and initializing the
* display with a "display window" for that area of the screen,
* turning off DMA and drawing outside the window when necessary (to
* update a drive indicator, debug message, or the UI outline itself).
*
* The core drawing operation uses the RA8875's MRWC command to send
* data in a transaction, driven by the DMA layer. It will do this:
* start
* RA8875_CMDWRITE
* RA8875_MRWC
* end
* start
* RA8875_DATAWRITE
* <all the data>
* end
*
* It's unclear to me whether or not we'll have to end and restart
* after every frame, but I'll find out as it's built...
*
* The one abstraction I did leave in here is which SPI pins are being
* used. This still supports moving to any of the three SPI busses.
*
* WIP: using the LED and Serial to debug why interrupts haven't been
* firing the way I expected. I think it may be because I didn't have a
* transaction running.
* ... no, that didn't seem to solve the problem.
*
* I don't know if the way I'm maybeUpdateTCR-ing with
* LPSPI_TCR_PCS(3) is correct or not -- I haven't fully comprehended
* what the code in 9341/7735 are doing there, because it's combined
* with the D/C pin functionality.
*
* Some pages I've been reading:
* https://forum.pjrc.com/threads/57280-RA8875-from-Buydisplay/page9?highlight=lpspi_tcr_pcs (pg9)
* https://www.displayfuture.com/Display/datasheet/controller/ST7735.pdf
* https://github.com/ElectroTechnique/TSynth-for-Teensy3.6/blob/master/ST7735_t3.cpp
* https://github-wiki-see.page/m/TeensyUser/doc/wiki/Memory-Mapping
*/
#define COUNT_PIXELS_WRITE (RA8875_WIDTH * RA8875_HEIGHT)
// at 8bpp, each pixel is 1 byte
#define PIXELSIZE 1
#define TCR_MASK (LPSPI_TCR_PCS(3) | LPSPI_TCR_FRAMESZ(31) | LPSPI_TCR_CONT | LPSPI_TCR_RXMSK )
#define _565toR(c) ( ((c) & 0xF800) >> 8 )
#define _565toG(c) ( ((c) & 0x07E0) >> 3 )
#define _565toB(c) ( ((c) & 0x001F) << 3 )
static RA8875_t4 *_dmaActiveDisplay[3];
RA8875_t4::RA8875_t4(const uint8_t cs_pin, const uint8_t rst_pin, const uint8_t mosi_pin, const uint8_t sck_pin, const uint8_t miso_pin)
{
pinMode(13, OUTPUT);
digitalWrite(13, HIGH);
_mosi = mosi_pin;
_miso = miso_pin;
_cs = cs_pin;
_rst = rst_pin;
_sck = sck_pin;
_interruptStates = 0b00000000;
_pspi = NULL;
_pfbtft = NULL;
_dma_state = 0;
_frame_complete_callback = NULL;
_frame_callback_on_HalfDone = false;
_dma_frame_count = 0;
_dma_sub_frame_count = 0;
_dmaActiveDisplay[0] = _dmaActiveDisplay[1] = _dmaActiveDisplay[2] = NULL;
}
RA8875_t4::~RA8875_t4()
{
}
void RA8875_t4::begin(uint32_t spi_clock, uint32_t spi_clock_read)
{
_interruptStates = 0b00000000;
_spi_clock = spi_clock;
_spi_clock_read = spi_clock_read;
_clock = 4000000UL; // start at low speed
// figure out which SPI bus we're using
if (SPI.pinIsMOSI(_mosi) && ((_miso == 0xff) || SPI.pinIsMISO(_miso)) && SPI.pinIsSCK(_sck)) {
_pspi = &SPI;
_spi_num = 0;
_pimxrt_spi = &IMXRT_LPSPI4_S;
} else if (SPI1.pinIsMOSI(_mosi) && ((_miso == 0xff) || SPI1.pinIsMISO(_miso)) && SPI1.pinIsSCK(_sck)) {
_pspi = &SPI1;
_spi_num = 1;
_pimxrt_spi = &IMXRT_LPSPI3_S;
} else if (SPI2.pinIsMOSI(_mosi) && ((_miso == 0xff) || SPI2.pinIsMISO(_miso)) && SPI2.pinIsSCK(_sck)) {
_pspi = &SPI2;
_spi_num = 2;
_pimxrt_spi = &IMXRT_LPSPI1_S;
} else {
Serial.println("Pins given are not valid SPI bus pins");
return;
}
_pspi->setMOSI(_mosi);
_pspi->setSCK(_sck);
if (_miso != 0xff) _pspi->setMISO(_miso);
uint32_t *pa = (uint32_t *)_pspi;
_spi_hardware = (SPIClass::SPI_Hardware_t *)pa[1];
_pspi->begin();
_csport = portOutputRegister(_cs);
_cspinmask = digitalPinToBitMask(_cs);
pinMode(_cs, OUTPUT);
// DIRECT_WRITE_HIGH(_csport, _cspinmask);
digitalWriteFast(_cs, HIGH);
_spi_tcr_current = _pimxrt_spi->TCR; // get the current TCR value
maybeUpdateTCR(LPSPI_TCR_PCS(3)|LPSPI_TCR_FRAMESZ(7));
_initializeTFT();
}
void RA8875_t4::_initializeTFT()
{
// toggle RST low to reset
if (_rst < 255) {
pinMode(_rst, OUTPUT);
digitalWrite(_rst, HIGH);
delay(10);
digitalWrite(_rst, LOW);
delay(220);
digitalWrite(_rst, HIGH);
delay(300);
} else {
// Try a soft reset
writeCommand(RA8875_PWRR);
_writeData(RA8875_PWRR_SOFTRESET);
delay(20);
_writeData(RA8875_PWRR_NORMAL);
delay(200);
}
// Set the sysclock
_writeRegister(RA8875_PLLC1, 0x07); // same as default value: %0000 0111 == pre /=1; input /=7
delay(1);
_writeRegister(RA8875_PLLC1+1, 0x03); // same as default value: %0000 0011 == output /8
delay(1);
_writeRegister(RA8875_PCSR, 0x81); // pixel clock setting register: %1000 0001 == PDAT at PCLK falling edge; PCLK period is 2* system clock period
delay(1);
// colorspace
_writeRegister(RA8875_SYSR, 0x00); // 8-bit (0x0C == 16-bit)
_writeRegister(RA8875_HDWR, 0x63); // LCD horizontal display width == (v+1)*8
_writeRegister(RA8875_HNDFTR, 0x00); // Horizontal non-display period fine tuning
_writeRegister(RA8875_HNDR, 0x03); // LCD Horizontal non-display period register; period (in pixels) = (v+1)*8 + HNDFTR+2 == 32
_writeRegister(RA8875_HSTR, 0x03); // HSYNC start position register; start position (in pixels) = (v+1)*8 == 24
_writeRegister(RA8875_HPWR, 0x0B); // HSYNC pulse width register; %0000 1011 == HSYNC low active, hsync pulse width = ((v&32)+1)*8 = 88
_writeRegister(RA8875_VDHR0, 0xDF); // LCD Vertical display height register 0 (low byte of height, where height = this value + 1)
_writeRegister(RA8875_VDHR0+1, 0x01); // LCD Vertical display height register 1 (high byte of height)
_writeRegister(RA8875_VNDR0, 0x1F); // LCD vertical non-display period register 0 (low byte of non-display period in lines, where period=(VNDR+1) == 32)
_writeRegister(RA8875_VNDR0+1, 0x00); // LCD vertical non-display period register 1 (high byte of non-display period in lines)
_writeRegister(RA8875_VSTR0, 0x16); // VSYNC start position register 0; low byte, where start pos(line) = (VSTR+1) == 23
_writeRegister(RA8875_VSTR0+1, 0x00); // VSYNC start position register 1; high byte
_writeRegister(RA8875_VPWR, 0x01); // VSYNC pulse width register; %0000 0001 == low active, pulse width (in lines) = (v&0x7F)+1 == 2
// Set the entire screen as the active window
_writeRegister(RA8875_HSAW0, 0x00); // horizontal start point of active window
_writeRegister(RA8875_HSAW0+1, 0x00);
_writeRegister(RA8875_HEAW0, (RA8875_WIDTH-1) & 0xFF);
_writeRegister(RA8875_HEAW0+1, (RA8875_WIDTH-1) >> 8); // horizontal end point of active window
_writeRegister(RA8875_VSAW0, 0x00); // vertical start point of active window
_writeRegister(RA8875_VSAW0+1, 0x00);
_writeRegister(RA8875_VEAW0, (RA8875_HEIGHT-1) & 0xFF); // vertical end point of active window
_writeRegister(RA8875_VEAW0+1, (RA8875_HEIGHT-1) >> 8);
delay(10);
// Update the sysclock
_writeRegister(RA8875_PLLC1, 0x0B); // %0000 1011 == pre-drive /1; input /11
delay(1);
_writeRegister(RA8875_PLLC1+1, 0x02); // %0000 0010 == PLL output /4
delay(1);
_writeRegister(RA8875_PCSR, 0x81); // %1000 0001 == PDAT at PCLK falling edge; PCLK period is 2* system clock period
delay(1);
_clock = _spi_clock; // speed up to full speed now
delay(1);
// clear memory
uint8_t temp;
temp = _readRegister(RA8875_MCLR);
temp |= (1<<7);
_writeData(temp);
_waitBusy(0x80);
delay(1);
// turn on the display
_writeRegister(RA8875_PWRR, RA8875_PWRR_NORMAL | RA8875_PWRR_DISPON);
delay(1);
fillWindow(); // defaults to black
// turn on backlight
_writeRegister(RA8875_P1CR, (RA8875_PxCR_ENABLE | (RA8875_PWM_CLK_DIV1024 & 0xF)));
_writeRegister(RA8875_P1DCR, 255); // brightness
// set graphics mode & default memory write order/behavior
_writeRegister(RA8875_MWCR0, 0x00);
// *** rotation?
// Not sure we have to do this a second time, but set active window...
_writeRegister(RA8875_HSAW0, 0x00); // horizontal start point of active window
_writeRegister(RA8875_HSAW0+1, 0x00);
_writeRegister(RA8875_HEAW0, (RA8875_WIDTH-1) & 0xFF);
_writeRegister(RA8875_HEAW0+1, (RA8875_WIDTH-1) >> 8); // horizontal end point of active window
_writeRegister(RA8875_VSAW0, 0x00); // vertical start point of active window
_writeRegister(RA8875_VSAW0+1, 0x00);
_writeRegister(RA8875_VEAW0, (RA8875_HEIGHT-1) & 0xFF); // vertical end point of active window
_writeRegister(RA8875_VEAW0+1, (RA8875_HEIGHT-1) >> 8);
// set foreground color
_writeRegister(RA8875_FGCR0, 0);
_writeRegister(RA8875_FGCR0+1, 0);
_writeRegister(RA8875_FGCR0+2, 0);
// set background color
_writeRegister(RA8875_BGCR0, 0);
_writeRegister(RA8875_BGCR0+1, 0);
_writeRegister(RA8875_BGCR0+2, 0);
// _writeRegister(RA8875_FNCR1, 0); // probably not necessary since we're not using built-in fonts
// setCursor(0,0);
_writeRegister(RA8875_GPIOX, true); // turn on backlight
}
void RA8875_t4::setFrameBuffer(uint8_t *frame_buffer)
{
_pfbtft = frame_buffer;
_dma_state &= ~RA8875_DMA_INIT;
}
bool RA8875_t4::asyncUpdateActive()
{
return false;
}
void RA8875_t4::initDMASettings()
{
if (_dma_state & RA8875_DMA_INIT)
return;
Serial.println("Initializing DMA");
uint8_t dmaTXevent = _spi_hardware->tx_dma_channel;
if (_dma_state & RA8875_DMA_EVER_INIT) {
_dmasettings[0].sourceBuffer(_pfbtft, COUNT_PIXELS_WRITE * PIXELSIZE);
// FIXME: I don't know if arm_dcache_flush is sufficient to break the cache? cf https://github-wiki-see.page/m/TeensyUser/doc/wiki/Memory-Mapping
// The ILI9341 code uses 3 buffers and "copies the data" - but _pfbtft is malloc'd a 2* the size of the pixels (+32, presumably for alignment?) - and it's 16-bit, so 2* pixels is just the data itself.
// So how is it that dmasettings[0] -> _pfbtft, and
// dmasettings[1] -> _pfbtft[middle] and
// dmasettings[2] -> _pfbtft[end] yet [1] and [2] also refer to the full buffer size? That would mean
// _pfbtft is malloc'd to double the size it needs and there's some floating copying going on?
// I see no memcpy() calls... and in "first time we init" it looks diferent too, so I'm very confused
_dmasettings[1].sourceBuffer(&_pfbtft[COUNT_PIXELS_WRITE], COUNT_PIXELS_WRITE*PIXELSIZE);
_dmasettings[2].sourceBuffer(&_pfbtft[COUNT_PIXELS_WRITE*2], COUNT_PIXELS_WRITE*PIXELSIZE);
if (_frame_callback_on_HalfDone) _dmasettings[1].interruptAtHalf();
else _dmasettings[1].TCD->CSR &= ~DMA_TCD_CSR_INTHALF; // DMA_TCDn_CSR
} else {
_dmasettings[0].sourceBuffer(_pfbtft, COUNT_PIXELS_WRITE * PIXELSIZE);
_dmasettings[0].destination(_pimxrt_spi->TDR); // DMA sends data to LPSPI's transmit data register
_dmasettings[0].TCD->ATTR_DST = 1;
_dmasettings[0].replaceSettingsOnCompletion(_dmasettings[1]);
_dmasettings[1].sourceBuffer(_pfbtft, COUNT_PIXELS_WRITE*PIXELSIZE);
_dmasettings[1].destination(_pimxrt_spi->TDR);
_dmasettings[1].TCD->ATTR_DST = 1;
if (_frame_callback_on_HalfDone) _dmasettings[1].interruptAtHalf();
else _dmasettings[1].TCD->CSR &= ~DMA_TCD_CSR_INTHALF;
_dmasettings[1].replaceSettingsOnCompletion(_dmasettings[2]);
_dmasettings[2].sourceBuffer(_pfbtft, COUNT_PIXELS_WRITE*PIXELSIZE);
_dmasettings[2].destination(_pimxrt_spi->TDR);
_dmasettings[2].TCD->ATTR_DST = 1;
_dmasettings[2].replaceSettingsOnCompletion(_dmasettings[0]);
_dmasettings[2].interruptAtCompletion();
_dmatx = _dmasettings[0];
_dmatx.begin(true);
_dmatx.triggerAtHardwareEvent(dmaTXevent);
if (_spi_num == 0) _dmatx.attachInterrupt(dmaInterrupt);
else if (_spi_num == 1) _dmatx.attachInterrupt(dmaInterrupt1);
else _dmatx.attachInterrupt(dmaInterrupt2);
Serial.print("DMA is set up on SPI ");
Serial.println(_spi_num);
_dma_state = RA8875_DMA_INIT | RA8875_DMA_EVER_INIT;
}
}
bool RA8875_t4::updateScreenAsync(bool update_cont)
{
/* DEBUGGING: doing a sync update */
_writeRegister(RA8875_CURV0, 0);
_writeRegister(RA8875_CURV0+1, 0);
_writeRegister(RA8875_CURH0, 0);
_writeRegister(RA8875_CURH0+1, 0);
writeCommand(RA8875_MRWC);
_startSend();
_pspi->transfer(RA8875_DATAWRITE);
uint8_t *pfbtft_end = &_pfbtft[COUNT_PIXELS_WRITE];
uint8_t *pftbft = _pfbtft;
while (pftbft < pfbtft_end) {
_pspi->transfer(*pftbft++);
}
_endSend();
return true;
// DEBUG END
if (!_pfbtft) return false;
initDMASettings();
if (_dma_state & RA8875_DMA_ACTIVE)
return false;
Serial.println("-");
// Half of main ram has a 32k cache. This tells it to flush the cache if necessary.
if ((uint32_t)_pfbtft >= 0x20200000u) arm_dcache_flush(_pfbtft, RA8875_WIDTH*RA8875_HEIGHT);
_dmasettings[2].TCD->CSR &= ~(DMA_TCD_CSR_DREQ); // DMA_TCDn_CSR[3] -- If this flag is set, the eDMA hardware automatically clears the corresponding ERQ bit when the current major iteration count reaches zero.
// Don't need to reset the window b/c we never change it; but set the X/Y cursor back to the origin
_writeRegister(RA8875_CURV0, 0);
_writeRegister(RA8875_CURV0+1, 0);
_writeRegister(RA8875_CURH0, 0);
_writeRegister(RA8875_CURH0+1, 0);
// Start it sending data
writeCommand(RA8875_MRWC);
_startSend();
_pspi->transfer(RA8875_DATAWRITE);
_spi_fcr_save = _pimxrt_spi->FCR; // FIFO Control Register
_pimxrt_spi->FCR=0; // turn off FIFO watermarks
// Set transmit command register: disable RX ("mask out RX"), enable
// TX from FIFO (b/c it's not masked out), and 8-bit data transfers
// (7+1).
maybeUpdateTCR(LPSPI_TCR_PCS(3)|LPSPI_TCR_FRAMESZ(7) | LPSPI_TCR_RXMSK /*| LPSPI_TCR_CONT*/);
// Set up the DMA Enable Register to enable transmit DMA (and not receive DMA)
_pimxrt_spi->DER = LPSPI_DER_TDDE;
// Clear the status register %0011 1111 0000 0000 == set DMF, REF,
// TEF, TCF, FCF, WCF; clear MBF, RDF, TDF. MBF: busy flag; DMF:
// data match; REF: rec error flag; TEF: xmit error flag; TCF:
// xmit complete flag; FCF: frame complete flag; WCF: word
// complete flag; RDF: rec data flag; TDF: xmit data flag
_pimxrt_spi->SR = 0x3f00; // clear out all of the other status...
_dmatx.triggerAtHardwareEvent( _spi_hardware->tx_dma_channel );
_dmatx = _dmasettings[0];
_dmatx.begin(false);
_dmatx.enable();
_dma_frame_count = 0;
_dmaActiveDisplay[_spi_num] = this;
if (update_cont) {
_dma_state |= RA8875_DMA_CONT;
} else {
_dmasettings[2].disableOnCompletion();
_dma_state &= ~RA8875_DMA_CONT;
}
_dma_state |= RA8875_DMA_ACTIVE;
return true;
}
void RA8875_t4::fillWindow(uint16_t color)
{
int x0=0, y0=0;
int x1=RA8875_WIDTH-1,y1=RA8875_HEIGHT-1;
//X0
_writeRegister(RA8875_DLHSR0, x0 & 0xFF);
_writeRegister(RA8875_DLHSR0 + 1,x0 >> 8);
//Y0
_writeRegister(RA8875_DLVSR0, y0 & 0xFF);
_writeRegister(RA8875_DLVSR0 + 1,y0 >> 8);
//X1
_writeRegister(RA8875_DLHER0, x1 & 0xFF);
_writeRegister(RA8875_DLHER0 + 1,x1 >> 8);
//Y1
_writeRegister(RA8875_DLVER0, y1 & 0xFF);
_writeRegister(RA8875_DLVER0 + 1,y1 >> 8);
// Set the color
_writeRegister(RA8875_FGCR0,_565toR(color) >> 2); // 5 bits red -> 3 bits red
_writeRegister(RA8875_FGCR0+1,_565toG(color) >> 3); // 6 bits green -> 3 bits green
_writeRegister(RA8875_FGCR0+2,_565toB(color) >> 3); // 5 bits blue -> 2 bits blue
// Send fill
writeCommand(RA8875_DCR); // draw control register
_writeData(0xB0); // %1011 0000 == start draw; stop circle; fill shape; draw square; draw square (yes two different bits for draw square)
// Wait for completion (when DCR_LINESQUTRI_STATUS bit it set in read result, before TIMEOUT happens)
_waitPoll(RA8875_DCR, RA8875_DCR_LINESQUTRI_STATUS, _RA8875_WAITPOLL_TIMEOUT_DCR_LINESQUTRI_STATUS);
}
// *** Remove this and convert to native 8-bit? Or make it inline?
uint8_t _color16To8bpp(uint16_t color) {
return ((color & 0xe000) >> 8) | ((color & 0x700) >> 6) | ((color & 0x18) >> 3);
}
void RA8875_t4::drawPixel(int16_t x, int16_t y, uint16_t color)
{
// FIXME: bounds checking
// Set Y
_writeRegister(RA8875_CURV0, y & 0xFF); // cursor vertical location
_writeRegister(RA8875_CURV0+1, y >> 8);
// Set X
_writeRegister(RA8875_CURH0, x & 0xFF); // cursor horiz location
_writeRegister(RA8875_CURH0+1, (x >> 8));
// Send pixel data
writeCommand(RA8875_MRWC); // write to wherever MWCR1 says (which we expect to be default graphics layer)
// writeData16(color);
_writeData(_color16To8bpp(color));
}
uint32_t RA8875_t4::frameCount()
{
return 0;
}
void RA8875_t4::writeCommand(const uint8_t d)
{
_startSend();
_pspi->transfer(RA8875_CMDWRITE);
_pspi->transfer(d);
_endSend();
}
void RA8875_t4::writeData16(uint16_t data)
{
_startSend();
_pspi->transfer(RA8875_DATAWRITE);
_pspi->transfer16(data);
_endSend();
}
void RA8875_t4::_writeData(uint8_t data)
{
_startSend();
_pspi->transfer(RA8875_DATAWRITE);
_pspi->transfer(data);
_endSend();
}
uint8_t RA8875_t4::_readData(bool stat)
{
// FIXME do we need to slow down for reads?
_startSend();
_pspi->transfer(stat ? RA8875_CMDREAD : RA8875_DATAREAD);
uint8_t x = _pspi->transfer(0x00);
_endSend();
return x;
}
void RA8875_t4::_writeRegister(const uint8_t reg, uint8_t val)
{
writeCommand(reg);
_writeData(val);
}
uint8_t RA8875_t4::_readRegister(const uint8_t reg)
{
writeCommand(reg);
return _readData(false);
}
boolean RA8875_t4::_waitPoll(uint8_t regname, uint8_t waitflag, uint8_t timeout)
{
uint8_t temp;
unsigned long start_time = millis();
while (1) {
temp = _readRegister(regname);
if (!(temp & waitflag)) {
return true;
}
if ((millis() - start_time) > timeout) {
// timeout
return false;
}
}
/* NOTREACHED */
}
void RA8875_t4::_waitBusy(uint8_t res)
{
uint8_t temp;
unsigned long start = millis();//M.Sandercock
do {
if (res == 0x01) writeCommand(RA8875_DMACR);//dma
temp = _readData(true);
if ((millis() - start) > 10) return;
} while ((temp & res) == res);
}
void RA8875_t4::maybeUpdateTCR(uint32_t requested_tcr_state)
{
if ((_spi_tcr_current & TCR_MASK) != requested_tcr_state) {
// PCS is the peripheral chip select used for the transfer
_spi_tcr_current = (_spi_tcr_current & ~TCR_MASK) | requested_tcr_state ;
// only output when Transfer queue is empty.
while ((_pimxrt_spi->FSR & 0x1f) ) ;
_pimxrt_spi->TCR = _spi_tcr_current; // update the TCR
}
}
void RA8875_t4::dmaInterrupt(void) {
if (_dmaActiveDisplay[0]) {
_dmaActiveDisplay[0]->process_dma_interrupt();
}
}
void RA8875_t4::dmaInterrupt1(void) {
// FIXME this isn't being called - the LED doesn't go off.
// I'm using single (not continuous) async writes, so this *should* go off; and then call the interrupt; and then clear the state, so I get a second dash printed to the serial console, showing that it's doing another update. But instead I get one dash and then the sound buffer OVERRRUN messages b/c the main thread isn't running. It's got to be the DMA code that's hanging it somewhere.
digitalWrite(13, LOW);
if (_dmaActiveDisplay[1]) {
_dmaActiveDisplay[1]->process_dma_interrupt();
}
}
void RA8875_t4::dmaInterrupt2(void) {
if (_dmaActiveDisplay[2]) {
_dmaActiveDisplay[2]->process_dma_interrupt();
}
}
void RA8875_t4::process_dma_interrupt(void) {
_dmatx.clearInterrupt();
if (_frame_callback_on_HalfDone && (_dmatx.TCD->SADDR > _dmasettings[1].TCD->SADDR)) {
_dma_sub_frame_count = 1; // set as partial frame.
if (_frame_complete_callback)
(*_frame_complete_callback)();
} else {
_dma_frame_count++;
_dma_sub_frame_count = 0; // this is a full frame
if ((_dma_state & RA8875_DMA_CONT) == 0) {
// Single refresh, or the user canceled, so release the CS pin
while (_pimxrt_spi->FSR & 0x1f) ; // wait until transfer is done
while (_pimxrt_spi->SR & LPSPI_SR_MBF) ; // ... and the module is not busy
_dmatx.clearComplete();
_pimxrt_spi->FCR = LPSPI_FCR_TXWATER(15);
_pimxrt_spi->DER = 0; // turn off tx and rx DMA
_pimxrt_spi->CR = LPSPI_CR_MEN | LPSPI_CR_RRF | LPSPI_CR_RTF; //RRF: reset receive FIFO; RTF: reset transmit FIFO; MEN: enable module
_pimxrt_spi->SR = 0x3f00; // DMF|REF|TEF|TCF|FCF|WCF:
// DMF: data match flag set
// REF: receive error flag set
// TEF: transmit error flag set
// TCF: transfer complete flag set
// FCF: frame complete flag set
// WCF: word complete flag set
maybeUpdateTCR(LPSPI_TCR_PCS(3)|LPSPI_TCR_FRAMESZ(7)); // *** This is an 'assert_dc' moment
// *** the other modules send a NOP here, don't know why
_endSend();
_dma_state &= ~RA8875_DMA_ACTIVE;
_dmaActiveDisplay[_spi_num] = 0;
} else {
if (_frame_complete_callback)
(*_frame_complete_callback)();
else {
// Try to flush memory
if ((uint32_t)_pfbtft >= 0x20200000u)
arm_dcache_flush(_pfbtft, RA8875_WIDTH*RA8875_HEIGHT);
}
}
// make sure the code is synchronized - memory access must be
// complete before we continue
asm("dsb");
}
}
// Other possible methods, that I don't think we'll need:
// void RA8875_t4::setFrameCompleteCB(void (*pcb)(), bool fCallAlsoHalfDone)
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