another try

hid/platformio.ini

@@ -60,6 +60,7 @@ build_flags =
 build_flags =
 	-DCMD_SERIAL=Serial1
 	-DCMD_SERIAL_SPEED=115200
+	-DCMD_SERIAL_TIMEOUT=100000
 upload_port = /dev/ttyACM0
 
 [env:usb]

hid/src/main.cpp

@@ -42,9 +42,9 @@
 
 // #define CMD_SERIAL			Serial1
 // #define CMD_SERIAL_SPEED		115200
+// #define CMD_SERIAL_TIMEOUT	100000
 // -- OR --
 // #define CMD_SPI
-#define CMD_TIMEOUT 100000
 
 
 // -----------------------------------------------------------------------------
@@ -150,52 +150,49 @@ uint8_t handleCmdBuffer(const uint8_t *buffer) { // 8 bytes
 #ifdef CMD_SPI
 volatile uint8_t spi_in[8] = {0};
 volatile uint8_t spi_in_index = 0;
-volatile uint8_t spi_in_read = 0; // Вычитанное spiRead()
 
 volatile uint8_t spi_out[4] = {0};
 volatile uint8_t spi_out_index = 0;
 
-uint8_t spiAvailable() {
-	return spi_in_index - spi_in_read;
-}
-
-uint8_t spiRead() {
-	uint8_t value = 0;
-	if (spi_in_read < 8) {
-		value = spi_in[spi_in_read];
-		++spi_in_read;
-	}
-	return value;
+bool spiReady() {
+	return (!spi_out[0] && spi_in_index == 8);
 }
 
 void spiWrite(const uint8_t *buffer) {
-	if (spi_out[0] == 0) {
 	spi_out[3] = buffer[3];
 	spi_out[2] = buffer[2];
 	spi_out[1] = buffer[1];
 	spi_out[0] = buffer[0]; // Меджик разрешает начать ответ
-	}
-}
-
-void spiReadReset() {
-	spi_in_index = 0;
-	spi_in_read = 0;
+//	digitalWrite(5, 1);
 }
 
 ISR(SPI_STC_vect) {
-	if (spi_in_index < 8) {
-		spi_in[spi_in_index] = SPDR;
-		++spi_in_index;
-		SPDR = 0;
-	} else if (spi_out[0] && spi_out_index < 4) {
+	uint8_t in = SPDR;
+	if (spi_out[0] && spi_out_index < 4) {
+//		digitalWrite(4, !digitalRead(4));
 		SPDR = spi_out[spi_out_index];
+		bool err = (SPSR & (1 << WCOL));
+		if (!err) {
 			++spi_out_index;
 			if (spi_out_index == 4) {
-			spiReadReset();
-			spi_out[0] = 0;
 				spi_out_index = 0;
+				spi_in_index = 0;
+				spi_out[0] = 0;
+//				digitalWrite(5, 0);
+			}
 		}
 	} else {
+		static bool receiving = false;
+		if (!receiving && in == PROTO_MAGIC) {
+			receiving = true;
+		}
+		if (receiving && spi_in_index < 8) {
+			spi_in[spi_in_index] = in;
+			++spi_in_index;
+		}
+		if (spi_in_index == 8) {
+			receiving = false;
+		}
 		SPDR = 0;
 	}
 }
@@ -225,20 +222,17 @@ void sendCmdResponse(uint8_t code) {
 #	endif
 }
 
-bool isCmdTimedOut(unsigned long last) {
-	unsigned long now = micros();
-	return (
-		(now >= last && now - last > CMD_TIMEOUT)
-		|| (now < last && ((unsigned long)-1) - last + now > CMD_TIMEOUT)
-	);
-}
-
 void setup() {
 	hid_kbd.begin();
 #	ifdef HID_USB_MOUSE
 	hid_mouse.begin();
 #	endif
 
+	pinMode(3, OUTPUT);
+	pinMode(4, OUTPUT);
+	pinMode(5, OUTPUT);
+	pinMode(6, OUTPUT);
+
 #	ifdef CMD_SERIAL
 	CMD_SERIAL.begin(CMD_SERIAL_SPEED);
 #	elif defined(CMD_SPI)
@@ -248,9 +242,11 @@ void setup() {
 }
 
 void loop() {
+#	ifdef CMD_SERIAL
 	unsigned long last = micros();
 	uint8_t buffer[8];
 	uint8_t index = 0;
+#	endif
 
 	while (true) {
 #		ifdef HID_PS2_KBD
@@ -260,10 +256,6 @@ void loop() {
 #		ifdef CMD_SERIAL
 		if (CMD_SERIAL.available() > 0) {
 			buffer[index] = (uint8_t)CMD_SERIAL.read();
-#		elif defined(CMD_SPI)
-		if (spiAvailable() > 0) {
-			buffer[index] = spiRead();
-#		endif
 			if (index == 7) {
 				sendCmdResponse(handleCmdBuffer(buffer));
 				index = 0;
@@ -271,13 +263,26 @@ void loop() {
 				last = micros();
 				++index;
 			}
-		} else if (index > 0 && isCmdTimedOut(last)) {
-#			ifdef CMD_SERIAL
+		} else if (index > 0) {
+			unsigned long now = micros();
+			if (
+				(now >= last && now - last > CMD_SERIAL_TIMEOUT)
+				|| (now < last && ((unsigned long)-1) - last + now > CMD_SERIAL_TIMEOUT)
+			) {
 				sendCmdResponse(PROTO_RESP_TIMEOUT_ERROR);
-#			elif defined(CMD_SPI)
-			spiReadReset();
-#			endif
 				index = 0;
 			}
 		}
+#		elif defined(CMD_SPI)
+		if (SPSR & (1 << WCOL)) {
+			digitalWrite(3, HIGH);
+			uint8_t _ = SPDR;
+			delay(1);
+			digitalWrite(3, LOW);
+		}
+		if (spiReady()) {
+			sendCmdResponse(handleCmdBuffer(spi_in));
+		}
+#		endif
+	}
 }

kvmd/plugins/hid/spi.py

@@ -36,9 +36,9 @@ from ...logging import get_logger
 
 from ...yamlconf import Option
 
+from ...validators.basic import valid_bool
 from ...validators.basic import valid_int_f0
 from ...validators.basic import valid_int_f1
-from ...validators.basic import valid_float_f0
 from ...validators.basic import valid_float_f01
 
 from ._mcu import BasePhyConnection
@@ -52,26 +52,33 @@ class _SpiPhyConnection(BasePhyConnection):
         self,
         xfer: Callable[[bytes], bytes],
         read_timeout: float,
-        read_delay: float,
     ) -> None:
 
         self.__xfer = xfer
         self.__read_timeout = read_timeout
-        self.__read_delay = read_delay
 
     def send(self, request: bytes) -> bytes:
         assert len(request) == 8
+        assert request[0] == 0x33
+
+        deadline_ts = time.time() + self.__read_timeout
+        dummy = b"\x00" * 8
+        while time.time() < deadline_ts:
+            if bytes(self.__xfer(dummy)) == dummy:
+                break
+        else:
+            get_logger(0).error("SPI timeout reached while garbage reading")
+            return b""
+
         self.__xfer(request)
 
         response: List[int] = []
         deadline_ts = time.time() + self.__read_timeout
         found = False
         while time.time() < deadline_ts:
-            if not found:
-                time.sleep(self.__read_delay)
             for byte in self.__xfer(b"\x00" * (4 - len(response))):
                 if not found:
-                    if byte == 0:
+                    if byte != 0x33:
                         continue
                     found = True
                 response.append(byte)
@@ -90,18 +97,18 @@ class _SpiPhy(BasePhy):
         self,
         bus: int,
         chip: int,
+        cs: bool,
         max_freq: int,
         block_usec: int,
         read_timeout: float,
-        read_delay: float,
     ) -> None:
 
         self.__bus = bus
         self.__chip = chip
+        self.__cs = cs
         self.__max_freq = max_freq
         self.__block_usec = block_usec
         self.__read_timeout = read_timeout
-        self.__read_delay = read_delay
 
     def has_device(self) -> bool:
         return os.path.exists(f"/dev/spidev{self.__bus}.{self.__chip}")
@@ -110,6 +117,7 @@ class _SpiPhy(BasePhy):
     def connected(self) -> Generator[_SpiPhyConnection, None, None]:  # type: ignore
         with contextlib.closing(spidev.SpiDev(self.__bus, self.__chip)) as spi:
             spi.mode = 0
+            spi.no_cs = (not self.__cs)
             spi.max_speed_hz = self.__max_freq
 
             def xfer(data: bytes) -> bytes:
@@ -118,36 +126,29 @@ class _SpiPhy(BasePhy):
             yield _SpiPhyConnection(
                 xfer=xfer,
                 read_timeout=self.__read_timeout,
-                read_delay=self.__read_delay,
             )
 
 
 # =====
 class Plugin(BaseMcuHid):
-    def __init__(
-        self,
-        bus: int,
-        chip: int,
-        max_freq: int,
-        block_usec: int,
-        read_timeout: float,
-        read_delay: float,
-        **kwargs: Any,
-    ) -> None:
-
-        super().__init__(
-            phy=_SpiPhy(bus, chip, max_freq, block_usec, read_timeout, read_delay),
-            **kwargs,
-        )
+    def __init__(self, **kwargs: Any) -> None:
+        phy_kwargs: Dict = {key: kwargs.pop(key) for key in self.__get_phy_options()}
+        super().__init__(phy=_SpiPhy(**phy_kwargs), **kwargs)
 
     @classmethod
     def get_plugin_options(cls) -> Dict:
         return {
-            "bus":          Option(0,      type=valid_int_f0),
-            "chip":         Option(0,      type=valid_int_f0),
-            "max_freq":     Option(400000, type=valid_int_f1),
-            "block_usec":   Option(1,      type=valid_int_f0),
-            "read_timeout": Option(2.0,    type=valid_float_f01),
-            "read_delay":   Option(0.001,  type=valid_float_f0),
+            **cls.__get_phy_options(),
             **BaseMcuHid.get_plugin_options(),
         }
+
+    @classmethod
+    def __get_phy_options(cls) -> Dict:
+        return {
+            "bus":          Option(0,      type=valid_int_f0),
+            "chip":         Option(0,      type=valid_int_f0),
+            "cs":           Option(False,  type=valid_bool),
+            "max_freq":     Option(200000, type=valid_int_f1),
+            "block_usec":   Option(1,      type=valid_int_f0),
+            "read_timeout": Option(0.5,    type=valid_float_f01),
+        }

testenv/linters/vulture-wl.py

@@ -18,6 +18,7 @@ InotifyMask.UNMOUNT
 
 IpmiServer.handle_raw_request
 
+SpiDev.no_cs
 SpiDev.max_speed_hz
 
 _AtxApiPart.switch_power