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add static assert to ensure we do not break it in the future

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J. Nick Koston
2025-09-28 18:49:53 -05:00
parent 73ce3d4ef6
commit a37cd67bc3
1 changed files with 3 additions and 1 deletions
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4
esphome/components/usb_host/usb_host.h
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@@ -52,7 +52,8 @@ static const uint8_t USB_DIR_IN = 1 << 7;
static const uint8_t USB_DIR_OUT = 0;
static const size_t SETUP_PACKET_SIZE = 8;
static const size_t MAX_REQUESTS = 16; // maximum number of outstanding requests possible.
static const size_t MAX_REQUESTS = 16; // maximum number of outstanding requests possible.
static_assert(MAX_REQUESTS <= 16, "MAX_REQUESTS must be <= 16 to fit in uint16_t bitmask");
static constexpr size_t USB_EVENT_QUEUE_SIZE = 32; // Size of event queue between USB task and main loop
static constexpr size_t USB_TASK_STACK_SIZE = 4096; // Stack size for USB task (same as ESP-IDF USB examples)
static constexpr UBaseType_t USB_TASK_PRIORITY = 5; // Higher priority than main loop (tskIDLE_PRIORITY + 5)
@@ -164,6 +165,7 @@ class USBClient : public Component {
// Bit i = 1: requests_[i] is in use, Bit i = 0: requests_[i] is available
// Supports multiple concurrent consumers (both threads can allocate)
// Single producer for deallocation (main loop only)
// Limited to 16 slots by uint16_t size (enforced by static_assert)
std::atomic<uint16_t> trq_in_use_;
TransferRequest requests_[MAX_REQUESTS]{};
};