espradio: implement support for wifi/BLE on the ESP32-C3

This is a work in progress. It does not yet work.

espradio/radio.go

@@ -0,0 +1,71 @@
+package espradio
+
+/*
+// TODO: vary these by chip
+#cgo CFLAGS: -Iblobs/headers
+#cgo CFLAGS: -Iblobs/headers/esp32c3
+#cgo CFLAGS: -Iblobs/include
+#cgo LDFLAGS: -Lblobs/libs/esp32c3 -lcore -lmesh -lnet80211 -lphy -lpp -lwpa_supplicant
+
+#include "include.h"
+extern wifi_init_config_t wifi_config;
+*/
+import "C"
+import (
+	"runtime/interrupt"
+	"time"
+)
+
+type LogLevel uint8
+
+// Various log levels to use inside the espradio. Higher log levels will produce
+// more output over the serial console.
+const (
+	LogLevelNone    = C.WIFI_LOG_NONE
+	LogLevelError   = C.WIFI_LOG_ERROR
+	LogLevelWarning = C.WIFI_LOG_WARNING
+	LogLevelInfo    = C.WIFI_LOG_INFO
+	LogLevelDebug   = C.WIFI_LOG_DEBUG
+	LogLevelVerbose = C.WIFI_LOG_VERBOSE
+)
+
+type Config struct {
+	Logging LogLevel
+}
+
+// Enable and configure the radio.
+func Enable(config Config) error {
+	initHardware()
+
+	// TODO: run timers in separate goroutine
+
+	errCode := C.esp_wifi_internal_set_log_level(C.wifi_log_level_t(config.Logging))
+	if errCode != 0 {
+		return makeError(errCode)
+	}
+
+	// TODO: BLE needs the interrupts RWBT, RWBLE, BT_BB
+
+	mask := interrupt.Disable()
+	// TODO: setup 200Hz tick rate timer
+	// TODO: init_clocks
+	interrupt.Restore(mask)
+
+	// Initialize the wireless stack.
+	errCode = C.esp_wifi_init_internal(&C.wifi_config)
+	if errCode != 0 {
+		return makeError(errCode)
+	}
+
+	return nil
+}
+
+//export espradio_panic
+func espradio_panic(msg *C.char) {
+	panic("espradio: " + C.GoString(msg))
+}
+
+//export espradio_log_timestamp
+func espradio_log_timestamp() uint32 {
+	return uint32(time.Now().UnixMilli())
+}