cesp: new package containing C logic

.vscode/settings.json

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+{
+    "go.toolsEnvVars": {
+        "GOOS": "linux",
+        "GOARCH": "arm",
+        "GOROOT": "/home/pato/.cache/tinygo/goroot-5785ac87d82e22fa19480809c96061180a5be317b3abeefd9a525386974df68a",
+        "GOFLAGS": "-tags=tinygo.riscv,baremetal,linux,arm,tinygo.riscv32,esp32c3,esp,xiao_esp32c3,tinygo,purego,osusergo,math_big_pure_go,gc.conservative,scheduler.tasks,serial.usb,tinygo.unicore"
+    }
+}

cesp/arena.go

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+package cesp
+
+// ArenaInit hands base to the C arena allocator as the backing pool.
+// base must remain reachable for the lifetime of the program.
+func ArenaInit(base []byte) { arenaInit(base) }
+
+// ArenaStats returns current arena usage and total capacity in bytes.
+func ArenaStats() (used, capacity uint32) { return arenaStats() }

cesp/arena_c.go

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+//go:build esp32c3 || esp32c3_qemu_target || esp32s3
+
+package cesp
+
+/*
+#cgo CFLAGS: -fno-short-enums
+#cgo CFLAGS: -Iblobs/include
+#cgo CFLAGS: -Iblobs/include/local
+#cgo CFLAGS: -Iblobs/headers
+#include "espradio.h"
+*/
+import "C"
+import "unsafe"
+
+func arenaInit(base []byte) {
+	C.espradio_arena_init((*C.uint8_t)(unsafe.Pointer(&base[0])), C.size_t(len(base)))
+}
+
+func arenaStats() (used, capacity uint32) {
+	var u, c C.uint32_t
+	C.espradio_arena_stats(&u, &c)
+	return uint32(u), uint32(c)
+}

cesp/arena_stub.go

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+//go:build !(esp32c3 || esp32c3_qemu_target || esp32s3)
+
+package cesp
+
+func arenaInit(_ []byte)               { panic("espradio: not an ESP32 target") }
+func arenaStats() (uint32, uint32)     { panic("espradio: not an ESP32 target") }