---------------------------------------------------------- fast method to send multiple 16-bit values via SPI
| 145 | // ---------------------------------------------------------- |
| 146 | // fast method to send multiple 16-bit values via SPI |
| 147 | inline void Arduino_ST7789::writeMulti(uint16_t color, uint16_t num) |
| 148 | { |
| 149 | #ifdef COMPATIBILITY_MODE |
| 150 | while(num--) { SPI.transfer(color>>8); SPI.transfer(color); } |
| 151 | #else |
| 152 | asm volatile |
| 153 | ( |
| 154 | "next:\n" |
| 155 | "out %[spdr],%[hi]\n" |
| 156 | "rjmp .+0\n" // wait 8*2+1 = 17 cycles |
| 157 | "rjmp .+0\n" |
| 158 | "rjmp .+0\n" |
| 159 | "rjmp .+0\n" |
| 160 | "rjmp .+0\n" |
| 161 | "rjmp .+0\n" |
| 162 | "rjmp .+0\n" |
| 163 | "rjmp .+0\n" |
| 164 | "nop\n" |
| 165 | "out %[spdr],%[lo]\n" |
| 166 | "rjmp .+0\n" // wait 6*2+1 = 13 cycles + sbiw + brne |
| 167 | "rjmp .+0\n" |
| 168 | "rjmp .+0\n" |
| 169 | "rjmp .+0\n" |
| 170 | "rjmp .+0\n" |
| 171 | "rjmp .+0\n" |
| 172 | "nop\n" |
| 173 | "sbiw %[num],1\n" |
| 174 | "brne next\n" |
| 175 | : [num] "+w" (num) |
| 176 | : [spdr] "I" (_SFR_IO_ADDR(SPDR)), [lo] "r" ((uint8_t)color), [hi] "r" ((uint8_t)(color>>8)) |
| 177 | ); |
| 178 | #endif |
| 179 | } |
| 180 | // ---------------------------------------------------------- |
| 181 | // fast method to send multiple 16-bit values from RAM via SPI |
| 182 | inline void Arduino_ST7789::copyMulti(uint8_t *img, uint16_t num) |
nothing calls this directly
no outgoing calls
no test coverage detected