aiie/teensy/RA8875_t4.h
2022-02-02 07:17:05 -05:00

123 lines
3.5 KiB
C++

#ifndef _RA8875_T4_H
#define _RA8875_T4_H
#include <Arduino.h>
#include <SPI.h>
#include <DMAChannel.h>
#include <stdint.h>
#include "basedisplay.h"
#define RA8875_WIDTH 800
#define RA8875_HEIGHT 480
#define _RA8875_WAITPOLL_TIMEOUT_DCR_LINESQUTRI_STATUS 20
enum {
RA8875_DMA_INIT=0x01,
RA8875_DMA_EVER_INIT=0x08,
RA8875_DMA_CONT=0x02,
RA8875_DMA_FINISH=0x04,
RA8875_DMA_ACTIVE=0x80
};
class RA8875_t4 : public BaseDisplay {
public:
RA8875_t4(uint8_t cs_pin, uint8_t rst_pin, uint8_t mosi_pin, uint8_t sck_pin, uint8_t miso_pin, uint8_t dc_pin=255); // dc pin is unused for this display but it's needed for the ILI and base class.
~RA8875_t4();
virtual void begin(uint32_t spi_clock=30000000u, uint32_t spi_clock_read=2000000);
virtual void fillWindow(uint16_t color = 0x0000);
virtual void setFrameBuffer(uint8_t *frame_buffer);
virtual bool asyncUpdateActive();
virtual bool updateScreenAsync(bool update_cont = false);
virtual void drawPixel(int16_t x, int16_t y, uint16_t color);
virtual void cacheApplePixel(uint16_t x, uint16_t y, uint16_t color16);
virtual void cacheDoubleWideApplePixel(uint16_t x, uint16_t y, uint16_t color16);
virtual uint32_t frameCount();
uint8_t color16To8bpp(uint16_t color) __attribute__((always_inline)) {
return ((color & 0xe000) >> 8) | ((color & 0x700) >> 6) | ((color & 0x18) >> 3);
}
private:
void _initializeTFT();
void initDMASettings();
// These are the old style RA8875 calls -- replace them ***
void writeCommand(const uint8_t d);
void writeData16(uint16_t data);
void _writeData(uint8_t data);
void _writeRegister(const uint8_t reg, uint8_t val);
uint8_t _readData(bool stat);
uint8_t _readRegister(const uint8_t reg);
void _waitBusy(uint8_t res);
boolean _waitPoll(uint8_t regname, uint8_t waitflag, uint8_t timeout);
void maybeUpdateTCR(uint32_t requested_tcr_state);
static void dmaInterrupt(void);
void process_dma_interrupt(void);
protected:
uint8_t _cs, _miso, _mosi, _sck, _rst;
SPIClass *_pspi;
IMXRT_LPSPI_t *_pimxrt_spi;
SPIClass::SPI_Hardware_t *_spi_hardware;
uint32_t _spi_clock; // desired clock
uint32_t _spi_clock_read;
uint32_t _clock; // current clock, used in starting transactions (b/c we have to slow down sometimes)
// DMA stuff. The _dmasettings[] and _dmatx can't be member
// variables. If they are, then the object will work if it's
// statically allocated; but dynamically allocated RA8875_t4 objects
// would be malloc()'d in RAM2, which is a problem for DMA.
// So instead they're static globals in the module.
// DMASetting _dmasettings[12];
// DMAChannel _dmatx;
uint32_t _spi_fcr_save;
uint8_t *_pfbtft;
volatile uint8_t _dma_state;
uint32_t _spi_tcr_current;
volatile uint32_t _dma_frame_count;
protected:
void DIRECT_WRITE_LOW(volatile uint32_t * base, uint32_t mask) __attribute__((always_inline)) {
*(base+34) = mask;
}
void DIRECT_WRITE_HIGH(volatile uint32_t * base, uint32_t mask) __attribute__((always_inline)) {
*(base+33) = mask;
}
/* These are old-style function names, but with new-style contents */
void _startSend() __attribute__((always_inline)) {
_pspi->beginTransaction(SPISettings(_clock, MSBFIRST, SPI_MODE3));
_spi_tcr_current = _pimxrt_spi->TCR;
// DIRECT_WRITE_LOW(_csport, _cspinmask);
digitalWriteFast(_cs, LOW);
}
void _endSend() __attribute__((always_inline)) {
// DIRECT_WRITE_HIGH(_csport, _cspinmask);
digitalWriteFast(_cs, HIGH);
_pspi->endTransaction();
}
};
#endif