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95 lines
2.4 KiB
95 lines
2.4 KiB
#include "platform.h"
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#include "ws2812.h"
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static //inline __attribute__((always_inline))
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void ws2812_byte(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t b)
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{
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__disable_irq();
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for (register volatile uint8_t i = 0; i < 8; i++) {
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LL_GPIO_SetOutputPin(port, ll_pin);
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// duty cycle determines bit value
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if (b & 0x80) {
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for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
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LL_GPIO_ResetOutputPin(port, ll_pin);
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for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
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} else {
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for(uint32_t _i = 0; _i < 5; _i++) asm volatile("nop");
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LL_GPIO_ResetOutputPin(port, ll_pin);
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for(uint32_t _i = 0; _i < 10; _i++) asm volatile("nop");
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}
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b <<= 1; // shift to next bit
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}
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__enable_irq();
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}
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/** Set many RGBs */
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void ws2812_load(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t *rgbs, uint32_t count)
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{
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vPortEnterCritical();
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for (uint32_t i = 0; i < count; i++) {
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uint32_t rgb = *rgbs++;
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ws2812_byte(port, ll_pin, rgb_g(rgb));
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ws2812_byte(port, ll_pin, rgb_r(rgb));
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ws2812_byte(port, ll_pin, rgb_b(rgb));
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}
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vPortExitCritical();
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// TODO: Delay 50 us
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}
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/** Set many RGBs from packed stream */
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void ws2812_load_raw(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint32_t count)
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{
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vPortEnterCritical();
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uint8_t b, g, r;
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for (uint32_t i = 0; i < count; i++) {
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r = *rgbs++;
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g = *rgbs++;
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b = *rgbs++;
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ws2812_byte(port, ll_pin, g);
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ws2812_byte(port, ll_pin, r);
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ws2812_byte(port, ll_pin, b);
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}
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vPortExitCritical();
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// TODO: Delay 50 us
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}
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/** Set many RGBs from uint32 stream */
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void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint32_t count, bool bigendian)
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{
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vPortEnterCritical();
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uint8_t b, g, r;
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for (uint32_t i = 0; i < count; i++) {
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if (bigendian) {
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rgbs++; // skip
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b = *rgbs++;
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g = *rgbs++;
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r = *rgbs++;
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} else {
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r = *rgbs++;
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g = *rgbs++;
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b = *rgbs++;
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rgbs++; // skip
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}
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ws2812_byte(port, ll_pin, g);
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ws2812_byte(port, ll_pin, r);
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ws2812_byte(port, ll_pin, b);
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}
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vPortExitCritical();
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// TODO: Delay 50 us
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}
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/** Set many RGBs */
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void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count)
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{
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vPortEnterCritical();
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for (uint32_t i = 0; i < count*3; i++) {
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ws2812_byte(port, ll_pin, 0);
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}
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vPortExitCritical();
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// TODO: Delay 50 us
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}
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