J. Nick KostonandCopilot
40081e5ae7
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
#include "esphome/core/helpers.h"
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#include "esphome/core/defines.h"
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#ifdef USE_RP2040
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#include "esphome/core/hal.h"
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#if defined(USE_WIFI)
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#include <WiFi.h>
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#include <pico/cyw43_arch.h> // For cyw43_arch_lwip_begin/end (LwIPLock)
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#elif defined(USE_ETHERNET)
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#include <lwip_wrap.h> // For LWIPMutex — LwIPLock mirrors its semantics (see below)
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#include "esphome/components/ethernet/ethernet_component.h"
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#endif
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#include <hardware/structs/rosc.h>
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#include <hardware/sync.h>
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namespace esphome {
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bool random_bytes(uint8_t *data, size_t len) {
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while (len-- != 0) {
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uint8_t result = 0;
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for (uint8_t i = 0; i < 8; i++) {
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result <<= 1;
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result |= rosc_hw->randombit;
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}
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*data++ = result;
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}
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return true;
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}
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// RP2040 Mutex is defined inline in helpers.h for RP2040/ESP8266 builds.
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IRAM_ATTR InterruptLock::InterruptLock() { state_ = save_and_disable_interrupts(); }
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IRAM_ATTR InterruptLock::~InterruptLock() { restore_interrupts(state_); }
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// On RP2040, lwip callbacks run from a low-priority user IRQ context, not the
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// main loop (see low_priority_irq_handler() in pico-sdk
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// async_context_threadsafe_background.c). This applies to both WiFi (CYW43) and
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// Ethernet (W5500) — both use async_context_threadsafe_background.
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//
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// Without locking, recv_fn() from IRQ context races with read_locked_() on the
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// main loop, corrupting the shared rx_buf_ pbuf chain (use-after-free, pbuf_cat
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// assertion failures). See esphome#10681.
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//
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// WiFi uses cyw43_arch_lwip_begin/end.
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//
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// For wired Ethernet, taking only the async_context lock is NOT enough. The
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// W5500 GPIO IRQ path (LwipIntfDev::_irq) checks arduino-pico's `__inLWIP`
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// counter to decide whether to defer packet processing. If we hold the
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// async_context lock without bumping `__inLWIP`, an interrupt-driven packet
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// arrival re-enters lwIP from IRQ context and corrupts pbufs (the `pbuf_cat`
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// assertion crash on wiznet-w5500-evb-pico). We mirror arduino-pico's
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// LWIPMutex (cores/rp2040/lwip_wrap.h) exactly: bump `__inLWIP`, take the
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// lock, and on release re-unmask any GPIO IRQs that were deferred while we
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// held it. We can't `using LwIPLock = LWIPMutex;` in helpers.h because
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// pulling lwip_wrap.h there poisons many TUs with lwIP types.
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//
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// When neither WiFi nor Ethernet is configured, this is a no-op since
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// there's no network stack and no lwip callbacks to race with.
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#if defined(USE_WIFI)
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LwIPLock::LwIPLock() { cyw43_arch_lwip_begin(); }
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LwIPLock::~LwIPLock() { cyw43_arch_lwip_end(); }
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#elif defined(USE_ETHERNET)
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LwIPLock::LwIPLock() {
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__inLWIP++;
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ethernet_arch_lwip_begin();
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}
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LwIPLock::~LwIPLock() {
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ethernet_arch_lwip_end();
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__inLWIP--;
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if (__needsIRQEN && !__inLWIP) {
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__needsIRQEN = false;
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ethernet_arch_lwip_gpio_unmask();
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}
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}
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#else
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LwIPLock::LwIPLock() {}
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LwIPLock::~LwIPLock() {}
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#endif
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void get_mac_address_raw(uint8_t *mac) { // NOLINT(readability-non-const-parameter)
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#ifdef USE_WIFI
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WiFi.macAddress(mac);
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#elif defined(USE_ETHERNET)
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ethernet::global_eth_component->get_eth_mac_address_raw(mac);
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#endif
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}
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} // namespace esphome
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#endif // USE_RP2040
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