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-rw-r--r--platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c457
-rw-r--r--platforms/chibios/drivers/vendor/RP/RP2040/ws2812_vendor.c189
2 files changed, 646 insertions, 0 deletions
diff --git a/platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c b/platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c
new file mode 100644
index 0000000000..949fc6dd93
--- /dev/null
+++ b/platforms/chibios/drivers/vendor/RP/RP2040/serial_vendor.c
@@ -0,0 +1,457 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "quantum.h"
+#include "serial_usart.h"
+#include "serial_protocol.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"
+
+#if !defined(MCU_RP)
+# error PIO Driver is only available for Raspberry Pi 2040 MCUs!
+#endif
+
+static inline bool receive_impl(uint8_t* destination, const size_t size, sysinterval_t timeout);
+static inline bool send_impl(const uint8_t* source, const size_t size);
+static inline void pio_serve_interrupt(void);
+
+#define MSG_PIO_ERROR ((msg_t)(-3))
+
+#if defined(SERIAL_PIO_USE_PIO1)
+static const PIO pio = pio1;
+
+OSAL_IRQ_HANDLER(RP_PIO1_IRQ_0_HANDLER) {
+ OSAL_IRQ_PROLOGUE();
+ pio_serve_interrupt();
+ OSAL_IRQ_EPILOGUE();
+}
+#else
+static const PIO pio = pio0;
+
+OSAL_IRQ_HANDLER(RP_PIO0_IRQ_0_HANDLER) {
+ OSAL_IRQ_PROLOGUE();
+ pio_serve_interrupt();
+ OSAL_IRQ_EPILOGUE();
+}
+#endif
+
+#define UART_TX_WRAP_TARGET 0
+#define UART_TX_WRAP 3
+
+// clang-format off
+#if defined(SERIAL_USART_FULL_DUPLEX)
+static const uint16_t uart_tx_program_instructions[] = {
+ // .wrap_target
+ 0x9fa0, // 0: pull block side 1 [7]
+ 0xf727, // 1: set x, 7 side 0 [7]
+ 0x6001, // 2: out pins, 1
+ 0x0642, // 3: jmp x--, 2 [6]
+ // .wrap
+};
+#else
+static const uint16_t uart_tx_program_instructions[] = {
+ // .wrap_target
+ 0x9fa0, // 0: pull block side 1 [7]
+ 0xf727, // 1: set x, 7 side 0 [7]
+ 0x6081, // 2: out pindirs, 1
+ 0x0642, // 3: jmp x--, 2 [6]
+ // .wrap
+};
+#endif
+// clang-format on
+
+static const pio_program_t uart_tx_program = {
+ .instructions = uart_tx_program_instructions,
+ .length = 4,
+ .origin = -1,
+};
+
+#define UART_RX_WRAP_TARGET 0
+#define UART_RX_WRAP 8
+
+// clang-format off
+static const uint16_t uart_rx_program_instructions[] = {
+ // .wrap_target
+ 0x2020, // 0: wait 0 pin, 0
+ 0xea27, // 1: set x, 7 [10]
+ 0x4001, // 2: in pins, 1
+ 0x0642, // 3: jmp x--, 2 [6]
+ 0x00c8, // 4: jmp pin, 8
+ 0xc020, // 5: irq wait 0
+ 0x20a0, // 6: wait 1 pin, 0
+ 0x0000, // 7: jmp 0
+ 0x8020, // 8: push block
+ // .wrap
+};
+// clang-format on
+
+static const pio_program_t uart_rx_program = {
+ .instructions = uart_rx_program_instructions,
+ .length = 9,
+ .origin = -1,
+};
+
+thread_reference_t rx_thread = NULL;
+static int rx_state_machine = -1;
+
+thread_reference_t tx_thread = NULL;
+static int tx_state_machine = -1;
+
+void pio_serve_interrupt(void) {
+ uint32_t irqs = pio->ints0;
+
+ // The RX FIFO is not empty any more, therefore wake any sleeping rx thread
+ if (irqs & (PIO_IRQ0_INTF_SM0_RXNEMPTY_BITS << rx_state_machine)) {
+ // Disable rx not empty interrupt
+ pio_set_irq0_source_enabled(pio, pis_sm0_rx_fifo_not_empty + rx_state_machine, false);
+
+ osalSysLockFromISR();
+ osalThreadResumeI(&rx_thread, MSG_OK);
+ osalSysUnlockFromISR();
+ }
+
+ // The TX FIFO is not full any more, therefore wake any sleeping tx thread
+ if (irqs & (PIO_IRQ0_INTF_SM0_TXNFULL_BITS << tx_state_machine)) {
+ // Disable tx not full interrupt
+ pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, false);
+ osalSysLockFromISR();
+ osalThreadResumeI(&tx_thread, MSG_OK);
+ osalSysUnlockFromISR();
+ }
+
+ // IRQ 0 is set on framing or break errors by the rx state machine
+ if (pio_interrupt_get(pio, 0UL)) {
+ pio_interrupt_clear(pio, 0UL);
+
+ osalSysLockFromISR();
+ osalThreadResumeI(&rx_thread, MSG_PIO_ERROR);
+ osalSysUnlockFromISR();
+ }
+}
+
+#if !defined(SERIAL_USART_FULL_DUPLEX)
+// The internal pull-ups of the RP2040 are rather weakish with a range of 50k to
+// 80k, which in turn do not provide enough current to guarantee fast signal rise
+// times with a parasitic capacitance of greater than 100pf. In real world
+// applications, like split keyboards which might have vias in the signal path
+// or long PCB traces, this prevents a successful communication. The solution
+// is to temporarily augment the weak pull ups from the receiving side by
+// driving the tx pin high. On the receiving side the lowest possible drive
+// strength is chosen because the transmitting side must still be able to drive
+// the signal low. With this configuration the rise times are fast enough and
+// the generated low level with 360mV will generate a logical zero.
+static inline void enter_rx_state(void) {
+ osalSysLock();
+ // Wait for the transmitting state machines FIFO to run empty. At this point
+ // the last byte has been pulled from the transmitting state machines FIFO
+ // into the output shift register. We have to wait a tiny bit more until
+ // this byte is transmitted, before we can turn on the receiving state
+ // machine again.
+ while (!pio_sm_is_tx_fifo_empty(pio, tx_state_machine)) {
+ }
+ // Wait for ~11 bits, 1 start bit + 8 data bits + 1 stop bit + 1 bit
+ // headroom.
+ chSysPolledDelayX(US2RTC(1 * MHZ, (1000000U * 11 / SERIAL_USART_SPEED)));
+ // Disable tx state machine to not interfere with our tx pin manipulation
+ pio_sm_set_enabled(pio, tx_state_machine, false);
+ gpio_set_drive_strength(SERIAL_USART_TX_PIN, GPIO_DRIVE_STRENGTH_2MA);
+ pio_sm_set_pins_with_mask(pio, tx_state_machine, 1U << SERIAL_USART_TX_PIN, 1U << SERIAL_USART_TX_PIN);
+ pio_sm_set_consecutive_pindirs(pio, tx_state_machine, SERIAL_USART_TX_PIN, 1U, false);
+ pio_sm_set_enabled(pio, rx_state_machine, true);
+ osalSysUnlock();
+}
+
+static inline void leave_rx_state(void) {
+ osalSysLock();
+ // In Half-duplex operation the tx pin dual-functions as sender and
+ // receiver. To not receive the data we will send, we disable the receiving
+ // state machine.
+ pio_sm_set_enabled(pio, rx_state_machine, false);
+ pio_sm_set_consecutive_pindirs(pio, tx_state_machine, SERIAL_USART_TX_PIN, 1U, true);
+ pio_sm_set_pins_with_mask(pio, tx_state_machine, 0U, 1U << SERIAL_USART_TX_PIN);
+ gpio_set_drive_strength(SERIAL_USART_TX_PIN, GPIO_DRIVE_STRENGTH_12MA);
+ pio_sm_restart(pio, tx_state_machine);
+ pio_sm_set_enabled(pio, tx_state_machine, true);
+ osalSysUnlock();
+}
+#else
+// All this trickery is gladly not necessary for full-duplex.
+static inline void enter_rx_state(void) {}
+static inline void leave_rx_state(void) {}
+#endif
+
+/**
+ * @brief Clear the RX and TX hardware FIFOs of the state machines.
+ */
+inline void serial_transport_driver_clear(void) {
+ osalSysLock();
+ pio_sm_clear_fifos(pio, rx_state_machine);
+ pio_sm_clear_fifos(pio, tx_state_machine);
+ osalSysUnlock();
+}
+
+static inline msg_t sync_tx(sysinterval_t timeout) {
+ msg_t msg = MSG_OK;
+ osalSysLock();
+ while (pio_sm_is_tx_fifo_full(pio, tx_state_machine)) {
+ pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, true);
+ msg = osalThreadSuspendTimeoutS(&tx_thread, timeout);
+ if (msg < MSG_OK) {
+ break;
+ }
+ }
+ osalSysUnlock();
+ return msg;
+}
+
+static inline bool send_impl(const uint8_t* source, const size_t size) {
+ size_t send = 0;
+ msg_t msg;
+ while (send < size) {
+ msg = sync_tx(TIME_MS2I(SERIAL_USART_TIMEOUT));
+ if (msg < MSG_OK) {
+ return false;
+ }
+
+ osalSysLock();
+ while (send < size) {
+ if (pio_sm_is_tx_fifo_full(pio, tx_state_machine)) {
+ break;
+ }
+ if (send >= size) {
+ break;
+ }
+ pio_sm_put(pio, tx_state_machine, (uint32_t)(*source));
+ source++;
+ send++;
+ }
+ osalSysUnlock();
+ }
+
+ return send == size;
+}
+
+/**
+ * @brief Blocking send of buffer with timeout.
+ *
+ * @return true Send success.
+ * @return false Send failed.
+ */
+inline bool serial_transport_send(const uint8_t* source, const size_t size) {
+ leave_rx_state();
+ bool result = send_impl(source, size);
+ enter_rx_state();
+
+ return result;
+}
+
+static inline msg_t sync_rx(sysinterval_t timeout) {
+ msg_t msg = MSG_OK;
+ osalSysLock();
+ while (pio_sm_is_rx_fifo_empty(pio, rx_state_machine)) {
+ pio_set_irq0_source_enabled(pio, pis_sm0_rx_fifo_not_empty + rx_state_machine, true);
+ msg = osalThreadSuspendTimeoutS(&rx_thread, timeout);
+ if (msg < MSG_OK) {
+ break;
+ }
+ }
+ osalSysUnlock();
+ return msg;
+}
+
+static inline bool receive_impl(uint8_t* destination, const size_t size, sysinterval_t timeout) {
+ size_t read = 0U;
+
+ while (read < size) {
+ msg_t msg = sync_rx(timeout);
+ if (msg < MSG_OK) {
+ return false;
+ }
+ osalSysLock();
+ while (true) {
+ if (pio_sm_is_rx_fifo_empty(pio, rx_state_machine)) {
+ break;
+ }
+ if (read >= size) {
+ break;
+ }
+ *destination++ = *((uint8_t*)&pio->rxf[rx_state_machine] + 3U);
+ read++;
+ }
+ osalSysUnlock();
+ }
+
+ return read == size;
+}
+
+/**
+ * @brief Blocking receive of size * bytes with timeout.
+ *
+ * @return true Receive success.
+ * @return false Receive failed, e.g. by timeout.
+ */
+inline bool serial_transport_receive(uint8_t* destination, const size_t size) {
+ return receive_impl(destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT));
+}
+
+/**
+ * @brief Blocking receive of size * bytes.
+ *
+ * @return true Receive success.
+ * @return false Receive failed.
+ */
+inline bool serial_transport_receive_blocking(uint8_t* destination, const size_t size) {
+ return receive_impl(destination, size, TIME_INFINITE);
+}
+
+static inline void pio_tx_init(pin_t tx_pin) {
+ uint pio_idx = pio_get_index(pio);
+ uint offset = pio_add_program(pio, &uart_tx_program);
+
+#if defined(SERIAL_USART_FULL_DUPLEX)
+ // clang-format off
+ iomode_t tx_pin_mode = PAL_RP_GPIO_OE |
+ PAL_RP_PAD_SLEWFAST |
+ PAL_RP_PAD_DRIVE4 |
+ (pio_idx == 0 ? PAL_MODE_ALTERNATE_PIO0 : PAL_MODE_ALTERNATE_PIO1);
+ // clang-format on
+ pio_sm_set_pins_with_mask(pio, tx_state_machine, 1U << tx_pin, 1U << tx_pin);
+ pio_sm_set_consecutive_pindirs(pio, tx_state_machine, tx_pin, 1U, true);
+#else
+ // clang-format off
+ iomode_t tx_pin_mode = PAL_RP_PAD_IE |
+ PAL_RP_GPIO_OE |
+ PAL_RP_PAD_SCHMITT |
+ PAL_RP_PAD_PUE |
+ PAL_RP_PAD_SLEWFAST |
+ PAL_RP_PAD_DRIVE12 |
+ PAL_RP_IOCTRL_OEOVER_DRVINVPERI |
+ (pio_idx == 0 ? PAL_MODE_ALTERNATE_PIO0 : PAL_MODE_ALTERNATE_PIO1);
+ // clang-format on
+ pio_sm_set_pins_with_mask(pio, tx_state_machine, 0U << tx_pin, 1U << tx_pin);
+ pio_sm_set_consecutive_pindirs(pio, tx_state_machine, tx_pin, 1U, true);
+#endif
+
+ palSetLineMode(tx_pin, tx_pin_mode);
+
+ pio_sm_config config = pio_get_default_sm_config();
+ sm_config_set_wrap(&config, offset + UART_TX_WRAP_TARGET, offset + UART_TX_WRAP);
+#if defined(SERIAL_USART_FULL_DUPLEX)
+ sm_config_set_sideset(&config, 2, true, false);
+#else
+ sm_config_set_sideset(&config, 2, true, true);
+#endif
+ // OUT shifts to right, no autopull
+ sm_config_set_out_shift(&config, true, false, 32);
+ // We are mapping both OUT and side-set to the same pin, because sometimes
+ // we need to assert user data onto the pin (with OUT) and sometimes
+ // assert constant values (start/stop bit)
+ sm_config_set_out_pins(&config, tx_pin, 1);
+ sm_config_set_sideset_pins(&config, tx_pin);
+ // We only need TX, so get an 8-deep FIFO!
+ sm_config_set_fifo_join(&config, PIO_FIFO_JOIN_TX);
+ // SM transmits 1 bit per 8 execution cycles.
+ float div = (float)clock_get_hz(clk_sys) / (8 * SERIAL_USART_SPEED);
+ sm_config_set_clkdiv(&config, div);
+ pio_sm_init(pio, tx_state_machine, offset, &config);
+ pio_sm_set_enabled(pio, tx_state_machine, true);
+}
+
+static inline void pio_rx_init(pin_t rx_pin) {
+ uint offset = pio_add_program(pio, &uart_rx_program);
+
+#if defined(SERIAL_USART_FULL_DUPLEX)
+ uint pio_idx = pio_get_index(pio);
+ pio_sm_set_consecutive_pindirs(pio, rx_state_machine, rx_pin, 1, false);
+ // clang-format off
+ iomode_t rx_pin_mode = PAL_RP_PAD_IE |
+ PAL_RP_PAD_SCHMITT |
+ PAL_RP_PAD_PUE |
+ (pio_idx == 0 ? PAL_MODE_ALTERNATE_PIO0 : PAL_MODE_ALTERNATE_PIO1);
+ // clang-format on
+ palSetLineMode(rx_pin, rx_pin_mode);
+#endif
+
+ pio_sm_config config = pio_get_default_sm_config();
+ sm_config_set_wrap(&config, offset + UART_RX_WRAP_TARGET, offset + UART_RX_WRAP);
+ sm_config_set_in_pins(&config, rx_pin); // for WAIT, IN
+ sm_config_set_jmp_pin(&config, rx_pin); // for JMP
+ // Shift to right, autopush disabled
+ sm_config_set_in_shift(&config, true, false, 32);
+ // Deeper FIFO as we're not doing any TX
+ sm_config_set_fifo_join(&config, PIO_FIFO_JOIN_RX);
+ // SM transmits 1 bit per 8 execution cycles.
+ float div = (float)clock_get_hz(clk_sys) / (8 * SERIAL_USART_SPEED);
+ sm_config_set_clkdiv(&config, div);
+ pio_sm_init(pio, rx_state_machine, offset, &config);
+ pio_sm_set_enabled(pio, rx_state_machine, true);
+}
+
+static inline void pio_init(pin_t tx_pin, pin_t rx_pin) {
+ uint pio_idx = pio_get_index(pio);
+
+ /* Get PIOx peripheral out of reset state. */
+ hal_lld_peripheral_unreset(pio_idx == 0 ? RESETS_ALLREG_PIO0 : RESETS_ALLREG_PIO1);
+
+ tx_state_machine = pio_claim_unused_sm(pio, true);
+ if (tx_state_machine < 0) {
+ dprintln("ERROR: Failed to acquire state machine for serial transmission!");
+ return;
+ }
+ pio_tx_init(tx_pin);
+
+ rx_state_machine = pio_claim_unused_sm(pio, true);
+ if (rx_state_machine < 0) {
+ dprintln("ERROR: Failed to acquire state machine for serial reception!");
+ return;
+ }
+ pio_rx_init(rx_pin);
+
+ // Enable error flag IRQ source for rx state machine
+ pio_set_irq0_source_enabled(pio, pis_sm0_rx_fifo_not_empty + rx_state_machine, true);
+ pio_set_irq0_source_enabled(pio, pis_sm0_tx_fifo_not_full + tx_state_machine, true);
+ pio_set_irq0_source_enabled(pio, pis_interrupt0, true);
+
+ // Enable PIO specific interrupt vector
+#if defined(SERIAL_PIO_USE_PIO1)
+ nvicEnableVector(RP_PIO1_IRQ_0_NUMBER, RP_IRQ_UART0_PRIORITY);
+#else
+ nvicEnableVector(RP_PIO0_IRQ_0_NUMBER, RP_IRQ_UART0_PRIORITY);
+#endif
+
+ enter_rx_state();
+}
+
+/**
+ * @brief PIO driver specific initialization function for the master side.
+ */
+void serial_transport_driver_master_init(void) {
+#if defined(SERIAL_USART_FULL_DUPLEX)
+ pin_t tx_pin = SERIAL_USART_TX_PIN;
+ pin_t rx_pin = SERIAL_USART_RX_PIN;
+#else
+ pin_t tx_pin = SERIAL_USART_TX_PIN;
+ pin_t rx_pin = SERIAL_USART_TX_PIN;
+#endif
+
+#if defined(SERIAL_USART_PIN_SWAP)
+ pio_init(rx_pin, tx_pin);
+#else
+ pio_init(tx_pin, rx_pin);
+#endif
+}
+
+/**
+ * @brief PIO driver specific initialization function for the slave side.
+ */
+void serial_transport_driver_slave_init(void) {
+#if defined(SERIAL_USART_FULL_DUPLEX)
+ pin_t tx_pin = SERIAL_USART_TX_PIN;
+ pin_t rx_pin = SERIAL_USART_RX_PIN;
+#else
+ pin_t tx_pin = SERIAL_USART_TX_PIN;
+ pin_t rx_pin = SERIAL_USART_TX_PIN;
+#endif
+
+ pio_init(tx_pin, rx_pin);
+}
diff --git a/platforms/chibios/drivers/vendor/RP/RP2040/ws2812_vendor.c b/platforms/chibios/drivers/vendor/RP/RP2040/ws2812_vendor.c
new file mode 100644
index 0000000000..bc34eded14
--- /dev/null
+++ b/platforms/chibios/drivers/vendor/RP/RP2040/ws2812_vendor.c
@@ -0,0 +1,189 @@
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "quantum.h"
+#include "ws2812.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"
+
+#if !defined(MCU_RP)
+# error PIO Driver is only available for Raspberry Pi 2040 MCUs!
+#endif
+
+#if defined(WS2812_PIO_USE_PIO1)
+static const PIO pio = pio1;
+#else
+static const PIO pio = pio0;
+#endif
+
+#if !defined(RP_DMA_PRIORITY_WS2812)
+# define RP_DMA_PRIORITY_WS2812 12
+#endif
+
+static int state_machine = -1;
+
+#define WS2812_WRAP_TARGET 0
+#define WS2812_WRAP 3
+
+#define WS2812_T1 2
+#define WS2812_T2 5
+#define WS2812_T3 3
+
+#if defined(WS2812_EXTERNAL_PULLUP)
+
+# pragma message "The GPIOs of the RP2040 are NOT 5V tolerant! Make sure to NOT apply any voltage over 3.3V to the RGB data pin."
+
+// clang-format off
+static const uint16_t ws2812_program_instructions[] = {
+ // .wrap_target
+ 0x7221, // 0: out x, 1 side 1 [2]
+ 0x0123, // 1: jmp !x, 3 side 0 [1]
+ 0x0400, // 2: jmp 0 side 0 [4]
+ 0xb442, // 3: nop side 1 [4]
+ // .wrap
+};
+
+#else
+
+static const uint16_t ws2812_program_instructions[] = {
+ // .wrap_target
+ 0x6221, // 0: out x, 1 side 0 [2]
+ 0x1123, // 1: jmp !x, 3 side 1 [1]
+ 0x1400, // 2: jmp 0 side 1 [4]
+ 0xa442, // 3: nop side 0 [4]
+ // .wrap
+};
+// clang-format on
+#endif
+
+static const pio_program_t ws2812_program = {
+ .instructions = ws2812_program_instructions,
+ .length = 4,
+ .origin = -1,
+};
+
+static uint32_t WS2812_BUFFER[RGBLED_NUM];
+static const rp_dma_channel_t* WS2812_DMA_CHANNEL;
+
+bool ws2812_init(void) {
+ uint pio_idx = pio_get_index(pio);
+ /* Get PIOx peripheral out of reset state. */
+ hal_lld_peripheral_unreset(pio_idx == 0 ? RESETS_ALLREG_PIO0 : RESETS_ALLREG_PIO1);
+
+ // clang-format off
+ iomode_t rgb_pin_mode = PAL_RP_PAD_SLEWFAST |
+ PAL_RP_GPIO_OE |
+ (pio_idx == 0 ? PAL_MODE_ALTERNATE_PIO0 : PAL_MODE_ALTERNATE_PIO1);
+ // clang-format on
+
+ palSetLineMode(RGB_DI_PIN, rgb_pin_mode);
+
+ state_machine = pio_claim_unused_sm(pio, true);
+ if (state_machine < 0) {
+ dprintln("ERROR: Failed to acquire state machine for WS2812 output!");
+ return false;
+ }
+
+ uint offset = pio_add_program(pio, &ws2812_program);
+
+ pio_sm_set_consecutive_pindirs(pio, state_machine, RGB_DI_PIN, 1, true);
+
+ pio_sm_config config = pio_get_default_sm_config();
+ sm_config_set_wrap(&config, offset + WS2812_WRAP_TARGET, offset + WS2812_WRAP);
+ sm_config_set_sideset_pins(&config, RGB_DI_PIN);
+ sm_config_set_fifo_join(&config, PIO_FIFO_JOIN_TX);
+
+#if defined(WS2812_EXTERNAL_PULLUP)
+ /* Instruct side-set to change the pin-directions instead of outputting
+ * a logic level. We generate our levels the following way:
+ *
+ * 1: Set RGB data pin to high impedance input and let the pull-up drive the
+ * signal high.
+ *
+ * 0: Set RGB data pin to low impedance output and drive the pin low.
+ */
+ sm_config_set_sideset(&config, 1, false, true);
+#else
+ sm_config_set_sideset(&config, 1, false, false);
+#endif
+
+#if defined(RGBW)
+ sm_config_set_out_shift(&config, false, true, 32);
+#else
+ sm_config_set_out_shift(&config, false, true, 24);
+#endif
+
+ int cycles_per_bit = WS2812_T1 + WS2812_T2 + WS2812_T3;
+ float div = clock_get_hz(clk_sys) / (800.0f * KHZ * cycles_per_bit);
+ sm_config_set_clkdiv(&config, div);
+
+ pio_sm_init(pio, state_machine, offset, &config);
+ pio_sm_set_enabled(pio, state_machine, true);
+
+ WS2812_DMA_CHANNEL = dmaChannelAlloc(RP_DMA_CHANNEL_ID_ANY, RP_DMA_PRIORITY_WS2812, NULL, NULL);
+
+ // clang-format off
+ uint32_t mode = DMA_CTRL_TRIG_INCR_READ |
+ DMA_CTRL_TRIG_DATA_SIZE_WORD |
+ DMA_CTRL_TRIG_IRQ_QUIET |
+ DMA_CTRL_TRIG_TREQ_SEL(pio_idx == 0 ? state_machine : state_machine + 8);
+ // clang-format on
+
+ dmaChannelSetModeX(WS2812_DMA_CHANNEL, mode);
+ dmaChannelSetDestinationX(WS2812_DMA_CHANNEL, (uint32_t)&pio->txf[state_machine]);
+ return true;
+}
+
+/**
+ * @brief Convert RGBW value into WS2812 compatible 32-bit data word.
+ */
+__always_inline static uint32_t rgbw8888_to_u32(uint8_t red, uint8_t green, uint8_t blue, uint8_t white) {
+#if (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_GRB)
+ return ((uint32_t)green << 24) | ((uint32_t)red << 16) | ((uint32_t)blue << 8) | ((uint32_t)white);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_RGB)
+ return ((uint32_t)red << 24) | ((uint32_t)green << 16) | ((uint32_t)blue << 8) | ((uint32_t)white);
+#elif (WS2812_BYTE_ORDER == WS2812_BYTE_ORDER_BGR)
+ return ((uint32_t)blue << 24) | ((uint32_t)green << 16) | ((uint32_t)red << 8) | ((uint32_t)white);
+#endif
+}
+
+static inline void sync_ws2812_transfer(void) {
+ if (unlikely(dmaChannelIsBusyX(WS2812_DMA_CHANNEL) || !pio_sm_is_tx_fifo_empty(pio, state_machine))) {
+ fast_timer_t start = timer_read_fast();
+ do {
+ // Abort the synchronization if we have to wait longer than the total
+ // count of LEDs in millisecounds. This is safely much longer than it
+ // would take to push all the data out.
+ if (unlikely(timer_elapsed_fast(start) > RGBLED_NUM)) {
+ dprintln("ERROR: WS2812 DMA transfer has stalled, aborting!");
+ dmaChannelDisableX(WS2812_DMA_CHANNEL);
+ return;
+ }
+
+ } while (dmaChannelIsBusyX(WS2812_DMA_CHANNEL) || !pio_sm_is_tx_fifo_empty(pio, state_machine));
+ // We wait for the WS2812 chain to reset after all data has been pushed
+ // out.
+ wait_us(WS2812_TRST_US);
+ }
+}
+
+void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {
+ static bool is_initialized = false;
+ if (unlikely(!is_initialized)) {
+ is_initialized = ws2812_init();
+ }
+
+ sync_ws2812_transfer();
+
+ for (int i = 0; i < leds; i++) {
+#if defined(RGBW)
+ WS2812_BUFFER[i] = rgbw8888_to_u32(ledarray[i].r, ledarray[i].g, ledarray[i].b, ledarray[i].w);
+#else
+ WS2812_BUFFER[i] = rgbw8888_to_u32(ledarray[i].r, ledarray[i].g, ledarray[i].b, 0);
+#endif
+ }
+
+ dmaChannelSetSourceX(WS2812_DMA_CHANNEL, (uint32_t)WS2812_BUFFER);
+ dmaChannelSetCounterX(WS2812_DMA_CHANNEL, leds);
+ dmaChannelEnableX(WS2812_DMA_CHANNEL);
+}