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96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/* Includes ----------------------------------------------------------------- */
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#include "ws2812.h"
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#include "device.h"
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#include "bsp/pwm.h"
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#include <stdlib.h>
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/* Private define ----------------------------------------------------------- */
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#define DEVICE_WS2812_T1H (uint16_t)(BSP_PWM_GetAutoReloadPreload(BSP_PWM_WS2812) * 0.56) // High-level width of logic-1 pulse
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#define DEVICE_WS2812_T0H (BSP_PWM_GetAutoReloadPreload(BSP_PWM_WS2812) * 0.29) // High-level width of logic-0 pulse
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#define DEVICE_WS2812_WS_REST 40 // Number of reset pulses (low level) after data stream
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#define DEVICE_WS2812_DATA_LEN 24 // WS2812 data length: 24 bits (GRB) per LED
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#define DEVICE_WS2812_RST_NUM 50 // Extra reset pulses reserved at the end of the buffer
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/* Private macro ------------------------------------------------------------ */
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/* Private typedef ---------------------------------------------------------- */
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/* Private variables -------------------------------------------------------- */
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static uint16_t DEVICE_WS2812_LED_NUM; // Total number of LEDs
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static uint16_t *DEVICE_WS2812_RGB_Buff = NULL;// PWM duty buffer for DMA
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/* Private function -------------------------------------------------------- */
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/* Exported functions ------------------------------------------------------- */
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/**
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* Set color of a single WS2812 LED
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* @param num LED index (1-based)
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* @param R Red value (0-255)
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* @param G Green value (0-255)
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* @param B Blue value (0-255)
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* @return DEVICE_OK on success, DEVICE_ERR if num is invalid
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*/
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uint8_t DEVICE_WS2812_Set(uint16_t num, uint8_t R, uint8_t G, uint8_t B)
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{
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if(num<1 || num>DEVICE_WS2812_LED_NUM) return DEVICE_ERR;
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uint32_t indexx = (num-1) * DEVICE_WS2812_DATA_LEN;
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/* WS2812 uses GRB order, MSB first */
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for (uint8_t i = 0; i < 8; i++) {
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// G
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DEVICE_WS2812_RGB_Buff[indexx + i] = (G & (0x80 >> i)) ? DEVICE_WS2812_T1H : DEVICE_WS2812_T0H;
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// R
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DEVICE_WS2812_RGB_Buff[indexx + i + 8] = (R & (0x80 >> i)) ? DEVICE_WS2812_T1H : DEVICE_WS2812_T0H;
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// B
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DEVICE_WS2812_RGB_Buff[indexx + i + 16] = (B & (0x80 >> i)) ? DEVICE_WS2812_T1H : DEVICE_WS2812_T0H;
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}
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return DEVICE_OK;
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}
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/**
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* Initialize WS2812 driver
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* @param ledNum Number of LEDs in the strip
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* @return DEVICE_OK on success, DEVICE_ERR if memory allocation or PWM setup fails
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*/
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uint8_t DEVICE_WS2812_Init(uint16_t ledNum)
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{
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DEVICE_WS2812_LED_NUM = ledNum;
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if (DEVICE_WS2812_RGB_Buff != NULL)
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{
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free(DEVICE_WS2812_RGB_Buff);
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DEVICE_WS2812_RGB_Buff = NULL;
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}
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/* Allocate new buffer: 24 PWM samples per LED + reset pulses */
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size_t bufLen = ledNum * DEVICE_WS2812_DATA_LEN + DEVICE_WS2812_RST_NUM;
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DEVICE_WS2812_RGB_Buff = (uint16_t *)malloc(bufLen * sizeof(uint16_t));
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if (DEVICE_WS2812_RGB_Buff == NULL)
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return DEVICE_ERR;
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/* Initialize all LEDs to dim green */
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for (int i = 1; i <= ledNum; i++)
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DEVICE_WS2812_Set(i, 0, 20, 0);
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/* Configure PWM frequency to 800 kHz and start DMA */
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if (BSP_PWM_SetFreq(BSP_PWM_WS2812, 800000) == DEVICE_OK)
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BSP_PWM_Start_DMA(
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BSP_PWM_WS2812,
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(uint32_t *)DEVICE_WS2812_RGB_Buff,
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bufLen);
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else
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return DEVICE_ERR;
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return DEVICE_OK;
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}
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/**
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* De-initialize WS2812 driver
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* Frees the DMA buffer and stops PWM
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*/
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void DEVICE_WS2812_DeInit()
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{
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for (int i = 1; i <= DEVICE_WS2812_LED_NUM; i++)
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DEVICE_WS2812_Set(i, 0, 0, 0);
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if (DEVICE_WS2812_RGB_Buff != NULL)
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{
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free(DEVICE_WS2812_RGB_Buff);
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DEVICE_WS2812_RGB_Buff = NULL;
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}
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BSP_PWM_Stop_DMA(BSP_PWM_WS2812);
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} |