mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-12 21:00:58 +00:00
346 lines
13 KiB
C
346 lines
13 KiB
C
#include "ws2812.h"
|
|
#include "quantum.h"
|
|
#include <hal.h>
|
|
|
|
/* Adapted from https://github.com/joewa/WS2812-LED-Driver_ChibiOS/ */
|
|
|
|
#ifdef RGBW
|
|
# define WS2812_CHANNELS 4
|
|
#else
|
|
# define WS2812_CHANNELS 3
|
|
#endif
|
|
|
|
#ifndef WS2812_PWM_DRIVER
|
|
# define WS2812_PWM_DRIVER PWMD2 // TIMx
|
|
#endif
|
|
#ifndef WS2812_PWM_CHANNEL
|
|
# define WS2812_PWM_CHANNEL 2 // Channel
|
|
#endif
|
|
#ifndef WS2812_PWM_PAL_MODE
|
|
# define WS2812_PWM_PAL_MODE 2 // DI Pin's alternate function value
|
|
#endif
|
|
#ifndef WS2812_DMA_STREAM
|
|
# define WS2812_DMA_STREAM STM32_DMA1_STREAM2 // DMA Stream for TIMx_UP
|
|
#endif
|
|
#ifndef WS2812_DMA_CHANNEL
|
|
# define WS2812_DMA_CHANNEL 2 // DMA Channel for TIMx_UP
|
|
#endif
|
|
#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE) && !defined(WS2812_DMAMUX_ID)
|
|
# error "please consult your MCU's datasheet and specify in your config.h: #define WS2812_DMAMUX_ID STM32_DMAMUX1_TIM?_UP"
|
|
#endif
|
|
|
|
#ifndef WS2812_PWM_COMPLEMENTARY_OUTPUT
|
|
# define WS2812_PWM_OUTPUT_MODE PWM_OUTPUT_ACTIVE_HIGH
|
|
#else
|
|
# if !STM32_PWM_USE_ADVANCED
|
|
# error "WS2812_PWM_COMPLEMENTARY_OUTPUT requires STM32_PWM_USE_ADVANCED == TRUE"
|
|
# endif
|
|
# define WS2812_PWM_OUTPUT_MODE PWM_COMPLEMENTARY_OUTPUT_ACTIVE_HIGH
|
|
#endif
|
|
|
|
// Push Pull or Open Drain Configuration
|
|
// Default Push Pull
|
|
#ifndef WS2812_EXTERNAL_PULLUP
|
|
# if defined(USE_GPIOV1)
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE_PUSHPULL
|
|
# else
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST | PAL_PUPDR_FLOATING
|
|
# endif
|
|
#else
|
|
# if defined(USE_GPIOV1)
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE_OPENDRAIN
|
|
# else
|
|
# define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_PWM_PAL_MODE) | PAL_OUTPUT_TYPE_OPENDRAIN | PAL_OUTPUT_SPEED_HIGHEST | PAL_PUPDR_FLOATING
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef WS2812_PWM_TARGET_PERIOD
|
|
//# define WS2812_PWM_TARGET_PERIOD 800000 // Original code is 800k...?
|
|
# define WS2812_PWM_TARGET_PERIOD 80000 // TODO: work out why 10x less on f303/f4x1
|
|
#endif
|
|
|
|
/* --- PRIVATE CONSTANTS ---------------------------------------------------- */
|
|
|
|
#define WS2812_PWM_FREQUENCY (CPU_CLOCK / 2) /**< Clock frequency of PWM, must be valid with respect to system clock! */
|
|
#define WS2812_PWM_PERIOD (WS2812_PWM_FREQUENCY / WS2812_PWM_TARGET_PERIOD) /**< Clock period in ticks. 1 / 800kHz = 1.25 uS (as per datasheet) */
|
|
|
|
/**
|
|
* @brief Number of bit-periods to hold the data line low at the end of a frame
|
|
*
|
|
* The reset period for each frame is defined in WS2812_TRST_US.
|
|
* Calculate the number of zeroes to add at the end assuming 1.25 uS/bit:
|
|
*/
|
|
#define WS2812_COLOR_BITS (WS2812_CHANNELS * 8)
|
|
#define WS2812_RESET_BIT_N (1000 * WS2812_TRST_US / WS2812_TIMING)
|
|
#define WS2812_COLOR_BIT_N (RGBLED_NUM * WS2812_COLOR_BITS) /**< Number of data bits */
|
|
#define WS2812_BIT_N (WS2812_COLOR_BIT_N + WS2812_RESET_BIT_N) /**< Total number of bits in a frame */
|
|
|
|
/**
|
|
* @brief High period for a zero, in ticks
|
|
*
|
|
* Per the datasheet:
|
|
* WS2812:
|
|
* - T0H: 200 nS to 500 nS, inclusive
|
|
* - T0L: 650 nS to 950 nS, inclusive
|
|
* WS2812B:
|
|
* - T0H: 200 nS to 500 nS, inclusive
|
|
* - T0L: 750 nS to 1050 nS, inclusive
|
|
*
|
|
* The duty cycle is calculated for a high period of 350 nS.
|
|
*/
|
|
#define WS2812_DUTYCYCLE_0 (WS2812_PWM_FREQUENCY / (1000000000 / 350))
|
|
|
|
/**
|
|
* @brief High period for a one, in ticks
|
|
*
|
|
* Per the datasheet:
|
|
* WS2812:
|
|
* - T1H: 550 nS to 850 nS, inclusive
|
|
* - T1L: 450 nS to 750 nS, inclusive
|
|
* WS2812B:
|
|
* - T1H: 750 nS to 1050 nS, inclusive
|
|
* - T1L: 200 nS to 500 nS, inclusive
|
|
*
|
|
* The duty cycle is calculated for a high period of 800 nS.
|
|
* This is in the middle of the specifications of the WS2812 and WS2812B.
|
|
*/
|
|
#define WS2812_DUTYCYCLE_1 (WS2812_PWM_FREQUENCY / (1000000000 / 800))
|
|
|
|
/* --- PRIVATE MACROS ------------------------------------------------------- */
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given bit
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] byte: The byte number [0, 2]
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
#define WS2812_BIT(led, byte, bit) (WS2812_COLOR_BITS * (led) + 8 * (byte) + (7 - (bit)))
|
|
|
|
#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
|
|
*
|
|
* @note The red byte is the middle byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 1, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
|
|
*
|
|
* @note The red byte is the first byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 0, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
|
|
*
|
|
* @note The red byte is the last byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit index [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
|
|
|
|
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
|
|
*
|
|
* @note The red byte is the middle byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 0, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
|
|
*
|
|
* @note The red byte is the first byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
|
|
*
|
|
* @note The red byte is the last byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit index [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 2, (bit))
|
|
|
|
#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given red bit
|
|
*
|
|
* @note The red byte is the middle byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_RED_BIT(led, bit) WS2812_BIT((led), 2, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given green bit
|
|
*
|
|
* @note The red byte is the first byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit number [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_GREEN_BIT(led, bit) WS2812_BIT((led), 1, (bit))
|
|
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given blue bit
|
|
*
|
|
* @note The red byte is the last byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref RGBLED_NUM)
|
|
* @param[in] bit: The bit index [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_BLUE_BIT(led, bit) WS2812_BIT((led), 0, (bit))
|
|
#endif
|
|
|
|
#ifdef RGBW
|
|
/**
|
|
* @brief Determine the index in @ref ws2812_frame_buffer "the frame buffer" of a given white bit
|
|
*
|
|
* @note The white byte is the last byte in the color packet
|
|
*
|
|
* @param[in] led: The led index [0, @ref WS2812_LED_N)
|
|
* @param[in] bit: The bit index [0, 7]
|
|
*
|
|
* @return The bit index
|
|
*/
|
|
# define WS2812_WHITE_BIT(led, bit) WS2812_BIT((led), 3, (bit))
|
|
#endif
|
|
|
|
/* --- PRIVATE VARIABLES ---------------------------------------------------- */
|
|
|
|
static uint32_t ws2812_frame_buffer[WS2812_BIT_N + 1]; /**< Buffer for a frame */
|
|
|
|
/* --- PUBLIC FUNCTIONS ----------------------------------------------------- */
|
|
/*
|
|
* Gedanke: Double-buffer type transactions: double buffer transfers using two memory pointers for
|
|
the memory (while the DMA is reading/writing from/to a buffer, the application can
|
|
write/read to/from the other buffer).
|
|
*/
|
|
|
|
void ws2812_init(void) {
|
|
// Initialize led frame buffer
|
|
uint32_t i;
|
|
for (i = 0; i < WS2812_COLOR_BIT_N; i++)
|
|
ws2812_frame_buffer[i] = WS2812_DUTYCYCLE_0; // All color bits are zero duty cycle
|
|
for (i = 0; i < WS2812_RESET_BIT_N; i++)
|
|
ws2812_frame_buffer[i + WS2812_COLOR_BIT_N] = 0; // All reset bits are zero
|
|
|
|
palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
|
|
|
|
// PWM Configuration
|
|
//#pragma GCC diagnostic ignored "-Woverride-init" // Turn off override-init warning for this struct. We use the overriding ability to set a "default" channel config
|
|
static const PWMConfig ws2812_pwm_config = {
|
|
.frequency = WS2812_PWM_FREQUENCY,
|
|
.period = WS2812_PWM_PERIOD, // Mit dieser Periode wird UDE-Event erzeugt und ein neuer Wert (Länge WS2812_BIT_N) vom DMA ins CCR geschrieben
|
|
.callback = NULL,
|
|
.channels =
|
|
{
|
|
[0 ... 3] = {.mode = PWM_OUTPUT_DISABLED, .callback = NULL}, // Channels default to disabled
|
|
[WS2812_PWM_CHANNEL - 1] = {.mode = WS2812_PWM_OUTPUT_MODE, .callback = NULL}, // Turn on the channel we care about
|
|
},
|
|
.cr2 = 0,
|
|
.dier = TIM_DIER_UDE, // DMA on update event for next period
|
|
};
|
|
//#pragma GCC diagnostic pop // Restore command-line warning options
|
|
|
|
// Configure DMA
|
|
// dmaInit(); // Joe added this
|
|
dmaStreamAlloc(WS2812_DMA_STREAM - STM32_DMA_STREAM(0), 10, NULL, NULL);
|
|
dmaStreamSetPeripheral(WS2812_DMA_STREAM, &(WS2812_PWM_DRIVER.tim->CCR[WS2812_PWM_CHANNEL - 1])); // Ziel ist der An-Zeit im Cap-Comp-Register
|
|
dmaStreamSetMemory0(WS2812_DMA_STREAM, ws2812_frame_buffer);
|
|
dmaStreamSetTransactionSize(WS2812_DMA_STREAM, WS2812_BIT_N);
|
|
dmaStreamSetMode(WS2812_DMA_STREAM, STM32_DMA_CR_CHSEL(WS2812_DMA_CHANNEL) | STM32_DMA_CR_DIR_M2P | STM32_DMA_CR_PSIZE_WORD | STM32_DMA_CR_MSIZE_WORD | STM32_DMA_CR_MINC | STM32_DMA_CR_CIRC | STM32_DMA_CR_PL(3));
|
|
// M2P: Memory 2 Periph; PL: Priority Level
|
|
|
|
#if (STM32_DMA_SUPPORTS_DMAMUX == TRUE)
|
|
// If the MCU has a DMAMUX we need to assign the correct resource
|
|
dmaSetRequestSource(WS2812_DMA_STREAM, WS2812_DMAMUX_ID);
|
|
#endif
|
|
|
|
// Start DMA
|
|
dmaStreamEnable(WS2812_DMA_STREAM);
|
|
|
|
// Configure PWM
|
|
// NOTE: It's required that preload be enabled on the timer channel CCR register. This is currently enabled in the
|
|
// ChibiOS driver code, so we don't have to do anything special to the timer. If we did, we'd have to start the timer,
|
|
// disable counting, enable the channel, and then make whatever configuration changes we need.
|
|
pwmStart(&WS2812_PWM_DRIVER, &ws2812_pwm_config);
|
|
pwmEnableChannel(&WS2812_PWM_DRIVER, WS2812_PWM_CHANNEL - 1, 0); // Initial period is 0; output will be low until first duty cycle is DMA'd in
|
|
}
|
|
|
|
void ws2812_write_led(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b) {
|
|
// Write color to frame buffer
|
|
for (uint8_t bit = 0; bit < 8; bit++) {
|
|
ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
}
|
|
}
|
|
void ws2812_write_led_rgbw(uint16_t led_number, uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
|
|
// Write color to frame buffer
|
|
for (uint8_t bit = 0; bit < 8; bit++) {
|
|
ws2812_frame_buffer[WS2812_RED_BIT(led_number, bit)] = ((r >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
ws2812_frame_buffer[WS2812_GREEN_BIT(led_number, bit)] = ((g >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
ws2812_frame_buffer[WS2812_BLUE_BIT(led_number, bit)] = ((b >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
#ifdef RGBW
|
|
ws2812_frame_buffer[WS2812_WHITE_BIT(led_number, bit)] = ((w >> bit) & 0x01) ? WS2812_DUTYCYCLE_1 : WS2812_DUTYCYCLE_0;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
// Setleds for standard RGB
|
|
void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
|
|
static bool s_init = false;
|
|
if (!s_init) {
|
|
ws2812_init();
|
|
s_init = true;
|
|
}
|
|
|
|
for (uint16_t i = 0; i < leds; i++) {
|
|
#ifdef RGBW
|
|
ws2812_write_led_rgbw(i, ledarray[i].r, ledarray[i].g, ledarray[i].b, ledarray[i].w);
|
|
#else
|
|
ws2812_write_led(i, ledarray[i].r, ledarray[i].g, ledarray[i].b);
|
|
#endif
|
|
}
|
|
}
|