We’re working on speeding up our LPD8806 library (for massive installations) and wanted to share our nice-and-fast ‘bitbang’ SPI code for use with Arduinos. we use this whenever we have a display that needs fast updating, but don’t want to constrain the system to using the hardware SPI port! You can check it out on GitHub…
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You can also use the counter variable as mask. This will make a better/smaller code:
…
uint8_t mask;
for (mask=0x80; mask!=0; mask>>=1) {
*clkportreg &= ~clkpin;
if(c & mask) {
*mosiportreg |= mosipin;
} else {
*mosiportreg &= ~mosipin;
}
*clkportreg |= clkpin;
}
*clkportreg &= ~clkpin;
// Make sure clock ends low
…