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102 lines
1.8 KiB
102 lines
1.8 KiB
#include <avr/io.h>
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#include <util/delay_basic.h>
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#include <stdint.h>
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#include "ws_driver.h"
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/** Raise the bus line */
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#define ws_high() (WS_PORT) |= (1 << WS_BIT)
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/** Drop the bus line */
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#define ws_low() (WS_PORT) &= ~(1 << WS_BIT)
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/* Convert nanoseconds to cycle count */
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#define ns2cycles(ns) ( (ns) / (1000000000L / (signed long) F_CPU) )
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/** Wait c cycles */
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#define delay_c(c) (((c) > 0) ? __builtin_avr_delay_cycles(c) : __builtin_avr_delay_cycles(0))
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/** Wait n nanoseconds, plus c cycles */
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#define delay_ns_c(ns, c) delay_c(ns2cycles(ns) + (c))
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void ws_show()
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{
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ws_low();
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delay_ns_c(WS_T_LATCH, 0);
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}
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void ws_send_byte(uint8_t bb)
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{
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for (int8_t i = 7; i >= 0; --i) {
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if (bb & (1 << i)) {
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// send ONE
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ws_high();
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delay_ns_c(WS_T_1H, -2);
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ws_low();
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delay_ns_c(WS_T_1L, -10); // compensation for overhead
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} else {
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// send ZERO
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ws_high();
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delay_ns_c(WS_T_0H, -2);
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ws_low();
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delay_ns_c(WS_T_0L, -10);
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}
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}
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}
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void ws_send_rgb(uint8_t r, uint8_t g, uint8_t b)
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{
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int8_t i;
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// GREEN
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for (i = 7; i >= 0; --i) {
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if (g & (1 << i)) {
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// send ONE
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ws_high();
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delay_ns_c(WS_T_1H, -2);
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ws_low();
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delay_ns_c(WS_T_1L, -10);
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} else {
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// send ZERO
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ws_high();
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delay_ns_c(WS_T_0H, -2);
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ws_low();
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delay_ns_c(WS_T_0L, -10);
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}
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}
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// RED
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for (i = 7; i >= 0; --i) {
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if (r & (1 << i)) {
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// send ONE
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ws_high();
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delay_ns_c(WS_T_1H, -2);
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ws_low();
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delay_ns_c(WS_T_1L, -10);
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} else {
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// send ZERO
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ws_high();
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delay_ns_c(WS_T_0H, -2);
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ws_low();
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delay_ns_c(WS_T_0L, -10);
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}
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}
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// BLUE
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for (i = 7; i >= 0; --i) {
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if (b & (1 << i)) {
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// send ONE
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ws_high();
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delay_ns_c(WS_T_1H, -2);
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ws_low();
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delay_ns_c(WS_T_1L, -10);
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} else {
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// send ZERO
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ws_high();
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delay_ns_c(WS_T_0H, -2);
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ws_low();
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delay_ns_c(WS_T_0L, -10);
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}
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}
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}
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