Arduino GFX 增加 QSPI Read 功能

1. 在 Arduino_DataBus.h 中增加 virtual void read 宣告

  class Arduino_DataBus
    {
      public:
        Arduino_DataBus();
          virtual void read(uint8_t cmd, uint8_t addr, uint8_t *data, uint8_t len) = 0;

2. 在 Arduino_ESP32SPI.h 中增加 void read 宣告

  class Arduino_ESP32SPI : public Arduino_DataBus
    {
      public:
        void read(uint8_t cmd, uint8_t addr, uint8_t *data, uint8_t len);

3. 在 Arduino_ESP32QSPI.h 中增加 void read 宣告

  class Arduino_ESP32QSPI : public Arduino_DataBus
    {
      public:
        void read(uint8_t cmd, uint8_t addr, uint8_t *data, uint8_t len) override;;

4. 在 Arduino_ESP32QSPI.c 中增加 void Arduino_ESP32QSPI::read 作法

  void Arduino_ESP32QSPI::read(uint8_t cmd, uint8_t addr, uint8_t *data, uint8_t len)
{
  CS_LOW();
  
  spi_transaction_ext_t trans = {};
  trans.base.flags = SPI_TRANS_VARIABLE_CMD | SPI_TRANS_VARIABLE_ADDR | SPI_TRANS_MODE_QIO;
  trans.base.cmd = cmd;
  trans.base.addr = addr;
  trans.base.rxlength = len * 8; 
  trans.base.rx_buffer = data;

  trans.command_bits = 8;
  trans.address_bits = 8;  
  trans.dummy_bits = 8;
  
  spi_device_polling_transmit(_handle, (spi_transaction_t *)&trans);
	
  CS_HIGH();
}