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[Bug] rp2040: fix timer wrap deadlock in ws2812 vendor driver (#19652)

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Co-authored-by: Sergey Vlasov <sigprof@gmail.com>
This commit is contained in:
Stefan Kerkmann 2023-01-23 22:24:21 +01:00 • committed by GitHub
parent ea05045923
commit 8ca3f0fb7c
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 10 additions and 6 deletions
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14
platforms/chibios/drivers/vendor/RP/RP2040/ws2812_vendor.c vendored
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@ -1,10 +1,13 @@
// Copyright 2022 Stefan Kerkmann (@KarlK90)
// SPDX-License-Identifier: GPL-2.0-or-later
#include "quantum.h"
#include "ws2812.h"
#include "hardware/pio.h"
#include "hardware/timer.h"
#include "hardware/clocks.h"
// Keep this exact include order otherwise we run into naming conflicts between
// pico-sdk and rp2040.h which we don't control.
#include "quantum.h"
#include "hardware/pio.h"
#if !defined(MCU_RP)
# error PIO Driver is only available for Raspberry Pi 2040 MCUs!
@ -132,7 +135,7 @@ static uint32_t RP_DMA_MODE_WS2812;
static int STATE_MACHINE = -1;
static SEMAPHORE_DECL(TRANSFER_COUNTER, 1);
static rtcnt_t LAST_TRANSFER;
static absolute_time_t LAST_TRANSFER;
/**
* @brief Convert RGBW value into WS2812 compatible 32-bit data word.
@ -161,7 +164,7 @@ static void ws2812_dma_callback(void* p, uint32_t ct) {
// Convert from ns to us
time_to_completion /= 1000;
LAST_TRANSFER = chSysGetRealtimeCounterX() + time_to_completion + WS2812_TRST_US;
update_us_since_boot(&LAST_TRANSFER, time_us_64() + time_to_completion + WS2812_TRST_US);
osalSysLockFromISR();
chSemSignalI(&TRANSFER_COUNTER);
@ -256,8 +259,7 @@ static inline void sync_ws2812_transfer(void) {
}
// Busy wait until last transfer has finished
while (unlikely(!timer_expired32(chSysGetRealtimeCounterX(), LAST_TRANSFER))) {
}
busy_wait_until(LAST_TRANSFER);
}
void ws2812_setleds(LED_TYPE* ledarray, uint16_t leds) {

2
platforms/chibios/vendors/RP/RP2040.mk vendored
View file

@ -25,6 +25,7 @@ PICOSDKROOT := $(TOP_DIR)/lib/pico-sdk
PICOSDKSRC = $(PICOSDKROOT)/src/rp2_common/hardware_clocks/clocks.c \
$(PICOSDKROOT)/src/rp2_common/hardware_pll/pll.c \
$(PICOSDKROOT)/src/rp2_common/hardware_pio/pio.c \
$(PICOSDKROOT)/src/rp2_common/hardware_timer/timer.c \
$(PICOSDKROOT)/src/rp2_common/hardware_flash/flash.c \
$(PICOSDKROOT)/src/rp2_common/hardware_gpio/gpio.c \
$(PICOSDKROOT)/src/rp2_common/hardware_claim/claim.c \
@ -44,6 +45,7 @@ PICOSDKINC = $(CHIBIOS)//os/various/pico_bindings/dumb/include \
$(PICOSDKROOT)/src/rp2_common/hardware_pll/include \
$(PICOSDKROOT)/src/rp2_common/hardware_pio/include \
$(PICOSDKROOT)/src/rp2_common/hardware_sync/include \
$(PICOSDKROOT)/src/rp2_common/hardware_timer/include \
$(PICOSDKROOT)/src/rp2_common/hardware_resets/include \
$(PICOSDKROOT)/src/rp2_common/hardware_watchdog/include \
$(PICOSDKROOT)/src/rp2_common/hardware_xosc/include \