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fix rp2040_pio_led flicker and proper multi-strip support (#6194)

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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
This commit is contained in:
Daniel Mahaney 2024-05-15 19:33:52 -04:00 committed by GitHub
parent 8952719045
commit ebfccc64c7
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GPG key ID: B5690EEEBB952194
3 changed files with 122 additions and 38 deletions
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75
esphome/components/rp2040_pio_led_strip/led_strip.cpp
View file

@ -6,6 +6,7 @@
#include "esphome/core/log.h"
#include <hardware/clocks.h>
#include <hardware/dma.h>
#include <hardware/pio.h>
#include <pico/stdlib.h>
@ -14,6 +15,15 @@ namespace rp2040_pio_led_strip {
static const char *TAG = "rp2040_pio_led_strip";
static uint8_t num_instance_[2] = {0, 0};
static std::map<Chipset, uint> chipset_offsets_ = {
{CHIPSET_WS2812, 0}, {CHIPSET_WS2812B, 0}, {CHIPSET_SK6812, 0}, {CHIPSET_SM16703, 0}, {CHIPSET_CUSTOM, 0},
};
static std::map<Chipset, bool> conf_count_ = {
{CHIPSET_WS2812, false}, {CHIPSET_WS2812B, false}, {CHIPSET_SK6812, false},
{CHIPSET_SM16703, false}, {CHIPSET_CUSTOM, false},
};
void RP2040PIOLEDStripLightOutput::setup() {
ESP_LOGCONFIG(TAG, "Setting up RP2040 LED Strip...");
@ -34,24 +44,71 @@ void RP2040PIOLEDStripLightOutput::setup() {
return;
}
// Initialize the PIO program
// Select PIO instance to use (0 or 1)
this->pio_ = pio0;
if (this->pio_ == nullptr) {
ESP_LOGE(TAG, "Failed to claim PIO instance");
this->mark_failed();
return;
}
// Load the assembled program into the PIO and get its location in the PIO's instruction memory
uint offset = pio_add_program(this->pio_, this->program_);
// if there are multiple strips, we can reuse the same PIO program and save space
// but there are only 4 state machines on each PIO so we can only have 4 strips per PIO
uint offset = 0;
if (num_instance_[this->pio_ == pio0 ? 0 : 1] > 4) {
ESP_LOGE(TAG, "Too many instances of PIO program");
this->mark_failed();
return;
}
// keep track of how many instances of the PIO program are running on each PIO
num_instance_[this->pio_ == pio0 ? 0 : 1]++;
// if there are multiple strips of the same chipset, we can reuse the same PIO program and save space
if (this->conf_count_[this->chipset_]) {
offset = chipset_offsets_[this->chipset_];
} else {
// Load the assembled program into the PIO and get its location in the PIO's instruction memory and save it
offset = pio_add_program(this->pio_, this->program_);
chipset_offsets_[this->chipset_] = offset;
conf_count_[this->chipset_] = true;
}
// Configure the state machine's PIO, and start it
this->sm_ = pio_claim_unused_sm(this->pio_, true);
if (this->sm_ < 0) {
// in theory this code should never be reached
ESP_LOGE(TAG, "Failed to claim PIO state machine");
this->mark_failed();
return;
}
// Initalize the DMA channel (Note: There are 12 DMA channels and 8 state machines so we won't run out)
this->dma_chan_ = dma_claim_unused_channel(true);
if (this->dma_chan_ < 0) {
ESP_LOGE(TAG, "Failed to claim DMA channel");
this->mark_failed();
return;
}
this->dma_config_ = dma_channel_get_default_config(this->dma_chan_);
channel_config_set_transfer_data_size(
&this->dma_config_,
DMA_SIZE_8); // 8 bit transfers (could be 32 but the pio program would need to be changed to handle junk data)
channel_config_set_read_increment(&this->dma_config_, true); // increment the read address
channel_config_set_write_increment(&this->dma_config_, false); // don't increment the write address
channel_config_set_dreq(&this->dma_config_,
pio_get_dreq(this->pio_, this->sm_, true)); // set the DREQ to the state machine's TX FIFO
dma_channel_configure(this->dma_chan_, &this->dma_config_,
&this->pio_->txf[this->sm_], // write to the state machine's TX FIFO
this->buf_, // read from memory
this->is_rgbw_ ? num_leds_ * 4 : num_leds_ * 3, // number of bytes to transfer
false // don't start yet
);
this->init_(this->pio_, this->sm_, offset, this->pin_, this->max_refresh_rate_);
}
@ -68,16 +125,8 @@ void RP2040PIOLEDStripLightOutput::write_state(light::LightState *state) {
return;
}
// assemble bits in buffer to 32 bit words with ex for GBR: 0bGGGGGGGGRRRRRRRRBBBBBBBB00000000
for (int i = 0; i < this->num_leds_; i++) {
uint8_t multiplier = this->is_rgbw_ ? 4 : 3;
uint8_t c1 = this->buf_[(i * multiplier) + 0];
uint8_t c2 = this->buf_[(i * multiplier) + 1];
uint8_t c3 = this->buf_[(i * multiplier) + 2];
uint8_t w = this->is_rgbw_ ? this->buf_[(i * 4) + 3] : 0;
uint32_t color = encode_uint32(c1, c2, c3, w);
pio_sm_put_blocking(this->pio_, this->sm_, color);
}
// the bits are already in the correct order for the pio program so we can just copy the buffer using DMA
dma_channel_transfer_from_buffer_now(this->dma_chan_, this->buf_, this->get_buffer_size_());
}
light::ESPColorView RP2040PIOLEDStripLightOutput::get_view_internal(int32_t index) const {

20
esphome/components/rp2040_pio_led_strip/led_strip.h
View file

@ -9,9 +9,11 @@
#include "esphome/components/light/addressable_light.h"
#include "esphome/components/light/light_output.h"
#include <hardware/dma.h>
#include <hardware/pio.h>
#include <hardware/structs/pio.h>
#include <pico/stdio.h>
#include <map>
namespace esphome {
namespace rp2040_pio_led_strip {
@ -25,6 +27,15 @@ enum RGBOrder : uint8_t {
ORDER_BRG,
};
enum Chipset : uint8_t {
CHIPSET_WS2812,
CHIPSET_WS2812B,
CHIPSET_SK6812,
CHIPSET_SM16703,
CHIPSET_APA102,
CHIPSET_CUSTOM = 0xFF,
};
inline const char *rgb_order_to_string(RGBOrder order) {
switch (order) {
case ORDER_RGB:
@ -69,6 +80,7 @@ class RP2040PIOLEDStripLightOutput : public light::AddressableLight {
void set_program(const pio_program_t *program) { this->program_ = program; }
void set_init_function(init_fn init) { this->init_ = init; }
void set_chipset(Chipset chipset) { this->chipset_ = chipset; };
void set_rgb_order(RGBOrder rgb_order) { this->rgb_order_ = rgb_order; }
void clear_effect_data() override {
for (int i = 0; i < this->size(); i++) {
@ -92,14 +104,22 @@ class RP2040PIOLEDStripLightOutput : public light::AddressableLight {
pio_hw_t *pio_;
uint sm_;
uint dma_chan_;
dma_channel_config dma_config_;
RGBOrder rgb_order_{ORDER_RGB};
Chipset chipset_{CHIPSET_CUSTOM};
uint32_t last_refresh_{0};
float max_refresh_rate_;
const pio_program_t *program_;
init_fn init_;
private:
inline static int num_instance_[2];
inline static std::map<Chipset, bool> conf_count_;
inline static std::map<Chipset, int> chipset_offsets_;
};
} // namespace rp2040_pio_led_strip

65
esphome/components/rp2040_pio_led_strip/light.py
View file

@ -68,12 +68,15 @@ static inline void rp2040_pio_led_strip_driver_{id}_init(PIO pio, uint sm, uint
pio_sm_config c = rp2040_pio_led_strip_{id}_program_get_default_config(offset);
sm_config_set_set_pins(&c, pin, 1);
sm_config_set_out_shift(&c, false, true, {32 if rgbw else 24});
sm_config_set_out_shift(&c, false, true, 8);
sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
int cycles_per_bit = 69;
float div = 2.409;
sm_config_set_clkdiv(&c, div);
// target frequency is 57.5MHz
long clk = clock_get_hz(clk_sys);
long target_freq = 57500000;
int n = 2;
int f = round(((clk / target_freq) - n ) * 256);
sm_config_set_clkdiv_int_frac(&c, n, f);
pio_sm_init(pio, sm, offset, &c);
@ -86,8 +89,9 @@ static inline void rp2040_pio_led_strip_driver_{id}_init(PIO pio, uint sm, uint
.wrap_target
awaiting_data:
; Wait for data in FIFO queue
; out null, 24 ; discard the byte lane replication of the FIFO since we only need 8 bits (not needed????)
pull block ; this will block until there is data in the FIFO queue and then it will pull it into the shift register
set y, {31 if rgbw else 23} ; set y to the number of bits to write counting 0, (23 if RGB, 31 if RGBW)
set y, 7 ; set y to the number of bits to write counting 0, (always 7 because we are doing one word at a time)
mainloop:
; go through each bit in the shift register and jump to the appropriate label
@ -95,7 +99,15 @@ mainloop:
out x, 1
jmp !x, writezero
jmp writeone
writeone:
; Write T1H and T1L bits to the output pin
set pins, 1 [{t1h}]
{nops_t1h}
set pins, 0 [{t1l}]
{nops_t1l}
jmp y--, mainloop
jmp awaiting_data
writezero:
; Write T0H and T0L bits to the output pin
@ -106,14 +118,7 @@ writezero:
jmp y--, mainloop
jmp awaiting_data
writeone:
; Write T1H and T1L bits to the output pin
set pins, 1 [{t1h}]
{nops_t1h}
set pins, 0 [{t1l}]
{nops_t1l}
jmp y--, mainloop
jmp awaiting_data
.wrap"""
@ -139,7 +144,15 @@ RP2040PIOLEDStripLightOutput = rp2040_pio_led_strip_ns.class_(
RGBOrder = rp2040_pio_led_strip_ns.enum("RGBOrder")
Chipsets = rp2040_pio_led_strip_ns.enum("Chipset")
Chipset = rp2040_pio_led_strip_ns.enum("Chipset")
CHIPSETS = {
"WS2812": Chipset.CHIPSET_WS2812,
"WS2812B": Chipset.CHIPSET_WS2812B,
"SK6812": Chipset.CHIPSET_SK6812,
"SM16703": Chipset.CHIPSET_SM16703,
"CUSTOM": Chipset.CHIPSET_CUSTOM,
}
@dataclass
@ -159,10 +172,10 @@ RGB_ORDERS = {
"BRG": RGBOrder.ORDER_BRG,
}
CHIPSETS = {
"WS2812": LEDStripTimings(20, 43, 41, 31),
"WS2812B": LEDStripTimings(23, 46, 46, 23),
"SK6812": LEDStripTimings(17, 52, 31, 31),
CHIPSET_TIMINGS = {
"WS2812": LEDStripTimings(20, 40, 46, 34),
"WS2812B": LEDStripTimings(23, 49, 46, 26),
"SK6812": LEDStripTimings(17, 52, 34, 34),
"SM16703": LEDStripTimings(17, 52, 52, 17),
}
@ -192,7 +205,7 @@ CONFIG_SCHEMA = cv.All(
cv.Required(CONF_NUM_LEDS): cv.positive_not_null_int,
cv.Required(CONF_RGB_ORDER): cv.enum(RGB_ORDERS, upper=True),
cv.Required(CONF_PIO): cv.one_of(0, 1, int=True),
cv.Optional(CONF_CHIPSET): cv.one_of(*CHIPSETS, upper=True),
cv.Optional(CONF_CHIPSET): cv.enum(CHIPSETS, upper=True),
cv.Optional(CONF_IS_RGBW, default=False): cv.boolean,
cv.Inclusive(
CONF_BIT0_HIGH,
@ -238,7 +251,8 @@ async def to_code(config):
key = f"led_strip_{id}"
if CONF_CHIPSET in config:
if chipset := config.get(CONF_CHIPSET):
cg.add(var.set_chipset(chipset))
_LOGGER.info("Generating PIO assembly code")
rp2040.add_pio_file(
__name__,
@ -246,13 +260,14 @@ async def to_code(config):
generate_assembly_code(
id,
config[CONF_IS_RGBW],
CHIPSETS[config[CONF_CHIPSET]].T0H,
CHIPSETS[config[CONF_CHIPSET]].T0L,
CHIPSETS[config[CONF_CHIPSET]].T1H,
CHIPSETS[config[CONF_CHIPSET]].T1L,
CHIPSET_TIMINGS[chipset].T0H,
CHIPSET_TIMINGS[chipset].T0L,
CHIPSET_TIMINGS[chipset].T1H,
CHIPSET_TIMINGS[chipset].T1L,
),
)
else:
cg.add(var.set_chipset(Chipset.CHIPSET_CUSTOM))
_LOGGER.info("Generating custom PIO assembly code")
rp2040.add_pio_file(
__name__,