驱动代码为:
void Rainbowduino::setPixelXY(unsigned char x, unsigned char y, uint32_t colorRGB /*24-bit RGB Color*/)
{
if(x > 7 || y > 7)
{
// Do nothing.
// This check is used to avoid writing to out-of-bound pixels by graphics function.
// But this might slow down setting pixels (remove this check if fast disply is desired)
}
else
{
colorRGB = (colorRGB & 0x00FFFFFF);
frameBuffer[0][x][y]=(colorRGB & 0x0000FF); //channel Blue
colorRGB = (colorRGB >> 8);
frameBuffer[1][x][y]=(colorRGB & 0x0000FF); //channel Green
colorRGB = (colorRGB >> 8);
frameBuffer[2][x][y]=(colorRGB & 0x0000FF); //channel Red
}
}
所以我会认为与上述类似:
uint8_t x,y,r,b,g;
uint32_t result = (r << 16) | (g << 8) | b;
Rb.setPixelXY(x, y, result);
应该管用。我认为上面可能需要括号,以确保正确排序,因为“+”高于“<<”。也可能不会受伤,但“|” 更好,以免防止不受欢迎的进位。
PS请记住,当移位为无符号时,除非您想要算术移位与逻辑移位。在这点上,我不喜欢轮班,因为它们经常混乱且效率低下。相反,联合是简单而有效的。
union rgb {
uint32_t word;
uint8_t byte[3];
struct {
uint8_t blue;
uint8_t green;
uint8_t red;
} color ;
}rgb ;
// one way to assign by discrete names.
rbg.color.blue = b;
rbg.color.green = g;
rbg.color.red = r;
//or assign using array
rgb.byte[0] = b;
rgb.byte[1] = g;
rgb.byte[2] = r;
// then interchangeably use the whole integer word when desired.
Rb.setPixelXY(x, y, rgb.word);
不要搞乱跟踪班次。