FastLED 3.9.15
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◆ send_bit()

void fl::third_party::ezWS2812gpio::send_bit ( bool bit_value) const
inlineprivate

Send a single bit using precise timing.

Definition at line 183 of file ezWS2812.h.

183 {
184 if (F_CPU >= 78000000) {
185 // Timing for 78MHz CPU
186 if (bit_value) {
187 // Send '1' bit: ~0.8µs high, ~0.45µs low
188 *port_set_ = pin_mask_;
189 __asm__ volatile(
190 "nop; nop; nop; nop; nop; nop; nop; nop;"
191 "nop; nop; nop; nop; nop; nop; nop; nop;"
192 "nop; nop; nop; nop; nop; nop; nop; nop;"
193 "nop; nop; nop; nop; nop; nop; nop; nop;"
194 "nop; nop; nop; nop; nop; nop; nop; nop;"
195 "nop; nop; nop; nop; nop; nop; nop; nop;"
196 "nop; nop; nop; nop; nop; nop; nop; nop;"
197 "nop; nop; nop; nop; nop; nop; nop; nop;"
198 );
199 *port_clear_ = pin_mask_;
200 __asm__ volatile(
201 "nop; nop; nop; nop; nop; nop; nop; nop;"
202 "nop; nop; nop; nop; nop; nop; nop; nop;"
203 "nop; nop; nop; nop; nop; nop; nop; nop;"
204 "nop; nop; nop; nop; nop; nop;"
205 );
206 } else {
207 // Send '0' bit: ~0.4µs high, ~0.85µs low
208 *port_set_ = pin_mask_;
209 __asm__ volatile(
210 "nop; nop; nop; nop; nop; nop; nop; nop;"
211 "nop; nop; nop; nop; nop; nop; nop; nop;"
212 "nop; nop; nop; nop; nop; nop; nop; nop;"
213 "nop; nop; nop; nop; nop; nop;"
214 );
215 *port_clear_ = pin_mask_;
216 __asm__ volatile(
217 "nop; nop; nop; nop; nop; nop; nop; nop;"
218 "nop; nop; nop; nop; nop; nop; nop; nop;"
219 "nop; nop; nop; nop; nop; nop; nop; nop;"
220 "nop; nop; nop; nop; nop; nop; nop; nop;"
221 "nop; nop; nop; nop; nop; nop; nop; nop;"
222 "nop; nop; nop; nop; nop; nop; nop; nop;"
223 "nop; nop; nop; nop; nop; nop; nop; nop;"
224 );
225 }
226 } else {
227 // Timing for 39MHz CPU (default)
228 if (bit_value) {
229 // Send '1' bit: ~0.8µs high, ~0.45µs low
230 *port_set_ = pin_mask_;
231 __asm__ volatile(
232 "nop; nop; nop; nop; nop; nop; nop; nop;"
233 "nop; nop; nop; nop; nop; nop; nop; nop;"
234 "nop; nop; nop; nop; nop; nop; nop; nop;"
235 "nop; nop; nop; nop; nop; nop; nop; nop;"
236 );
237 *port_clear_ = pin_mask_;
238 __asm__ volatile(
239 "nop; nop; nop; nop; nop; nop; nop; nop;"
240 "nop; nop; nop; nop; nop; nop; nop;"
241 );
242 } else {
243 // Send '0' bit: ~0.4µs high, ~0.85µs low
244 *port_set_ = pin_mask_;
245 __asm__ volatile(
246 "nop; nop; nop; nop; nop; nop; nop; nop;"
247 "nop; nop; nop; nop; nop; nop; nop;"
248 );
249 *port_clear_ = pin_mask_;
250 __asm__ volatile(
251 "nop; nop; nop; nop; nop; nop; nop; nop;"
252 "nop; nop; nop; nop; nop; nop; nop; nop;"
253 "nop; nop; nop; nop; nop; nop; nop; nop;"
254 "nop; nop; nop; nop; nop; nop; nop; nop;"
255 );
256 }
257 }
258 }
fl::third_party::ezWS2812gpio::port_set_
volatile uint32_t * port_set_
Definition ezWS2812.h:179
fl::third_party::ezWS2812gpio::port_clear_
volatile uint32_t * port_clear_
Definition ezWS2812.h:180
fl::third_party::ezWS2812gpio::pin_mask_
uint32_t pin_mask_
Definition ezWS2812.h:178

References pin_mask_, port_clear_, and port_set_.

Referenced by send_byte().

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