new usb uart examples

CANBus/README.md

@@ -0,0 +1,4 @@
+# CANBus
+
+I don't know if I believe it but this https://docs.pycom.io/firmwareapi/pycom/machine/can/ article claims that we can 
+use the `machine.CAN` with the ESP32.

CANBus/example.py

@@ -0,0 +1,5 @@
+from machine import CAN
+
+can = CAN(mode=CAN.NORMAL, baudrate=500000, pins=('P22', 'P23'))
+can.send(id=12, data=bytes([1, 2, 3, 4, 5, 6, 7, 8]))
+can.recv()

basics/README.md

@@ -87,7 +87,16 @@ def free(full=False):
 esptool.py --port /dev/cu.SLAB_USBtoUART erase_flash
 ```
 
+For an ESP32-S3
+```
+esptool.py --chip esp32-s3 --port /dev/cu.SLAB_USBtoUART erase_flash
+```
 2. If you have external spi ram (4MB) you want to use the spiram bin.
 ```
 esptool.py --chip esp32 --port /dev/cu.SLAB_USBtoUART --baud 460800 write_flash -z 0x1000 ./binaries/esp32-idf4-20210202-v1.14.bin
 ```
+
+For an ESP32-S3
+```
+esptool.py --chip esp32-s3 --port /dev/cu.SLAB_USBtoUART --baud 460800 write_flash -z 0x0000 ./binaries/GENERIC_S3_SPIRAM-20220117-v1.18.bin
+```

bluetooth/esp32/arni/robot.py

@@ -179,6 +179,3 @@ class ArniRobot:
         """Set motor velocity."""
         self._vel = velocity
         return self._vel
-
-# arni = ArniRobot(uart)
-# controller = RobotController(arni)

uart/usb_echo/README.md

@@ -0,0 +1,9 @@
+# USB Echo
+
+This is a simple program that runs in a loop, looking for character data over the 
+UART0 line which happens to be hooked up to the MicroUSB to UART circuit on these 
+dev kits.
+
+## Usage
+
+You should use the 

uart/usb_echo/main.py

@@ -0,0 +1,10 @@
+import select
+import sys
+
+print("Starting echo server over USB UART")
+print("...")
+
+while True:
+    if select.select([sys.stdin], [], [], 0)[0]:
+        characters = sys.stdin.readline()
+        print(f"Recieved: {characters.strip()}")

uart/usb_echo/serial_echo.py

@@ -0,0 +1,38 @@
+"""
+This is a simple program that runs in a loop, looking for character data over the
+UART0 line which happens to be hooked up to the MicroUSB to UART circuit on these
+dev kits.
+"""
+import os
+import random
+import serial
+import time
+
+ESP32_PORT= '/dev/cu.SLAB_USBtoUART' if os.uname().sysname == "Darwin" else "/dev/ttyUSB0"
+SENTENCES = [
+    "The little green frog hopped to the pond.\n",
+    "The cheese was late to the party.\n",
+    "Don't let your dreams just be dreams.\n"
+]
+
+
+def main():
+    print(f"Connecting to {ESP32_PORT}....")
+    try:
+        with serial.Serial(ESP32_PORT, 115200, timeout=1) as serial_conn:
+            while True:
+                if serial_conn.is_open:
+                    serial_conn.write(random.choice(SENTENCES).encode('ascii'))
+                    time.sleep(0.5)
+                    if serial_conn.in_waiting:
+                        print(f"Found {serial_conn.in_waiting} bytes waiting in input buffer!")
+                        print(serial_conn.readlines())
+                    else:
+                        print("No data received.")
+    except KeyboardInterrupt:
+        print("Exiting program")
+
+    exit(0)
+
+if __name__ == "__main__":
+    main()

uart/usb_serial_led/main.py

@@ -0,0 +1,42 @@
+import select
+import sys
+import time
+from machine import Pin
+from neopixel import NeoPixel
+
+print("Starting USB UART")
+print("...")
+
+NEO_PIXELS = NeoPixel(Pin(48), 1)
+
+
+def parse_cmd(raw_bytes):
+    # Drop the last element
+    raw_cmds = raw_bytes.strip().split(';')
+    cmds = []
+    for cmd in raw_cmds:
+        try:
+            led, red, green, blue = cmd.split(',')
+            # Still strings so zero is true here
+            if all([led, red, green, blue]) and len(cmd.split(',')) == 4:
+                cmds.append(tuple([int(led), tuple([int(red), int(green), int(blue)])]))
+        except ValueError:
+            continue
+    return cmds
+
+
+def main():
+    print("Waiting for commands...")
+
+    while True:
+        if select.select([sys.stdin], [], [], 0)[0]:
+            raw_cmds = sys.stdin.readline()
+            cmds = parse_cmd(raw_cmds)
+            # print(f"Parsed: {cmds}")
+            if cmds:
+                for led_cmd in cmds:
+                    led_id, led_value = led_cmd
+                    NEO_PIXELS[led_id] = led_value
+                NEO_PIXELS.write()
+
+main()

uart/usb_serial_led/serial_color_switcher.py

@@ -0,0 +1,41 @@
+"""
+This is a simple program that runs in a loop, looking for character data over the
+UART0 line which happens to be hooked up to the MicroUSB to UART circuit on these
+dev kits.
+"""
+import os
+import random
+import serial
+import time
+
+ESP32_PORT= '/dev/cu.SLAB_USBtoUART' if os.uname().sysname == "Darwin" else "/dev/ttyUSB0"
+
+COLORS = {
+    "red": "0,255,0,0;\n",
+    "blue": "0,125,204,223;\n",
+    "yellow": "0,120,153,23;\n",
+    "purple": "0,255,0,153;\n"
+}
+
+def main():
+    print(f"Connecting to {ESP32_PORT}....")
+    print("Sending color commands")
+    try:
+        with serial.Serial(ESP32_PORT, 115200, timeout=1) as serial_conn:
+            while True:
+                if serial_conn.is_open:
+                    color = random.choice(list(COLORS.keys()))
+                    print(f"Setting color: {color.upper()}")
+                    serial_conn.write(COLORS[color].encode('ascii'))
+                    time.sleep(0.1)
+                    if serial_conn.in_waiting:
+                        # print(f"Found {serial_conn.in_waiting} bytes waiting in input buffer!")
+                        print(serial_conn.readlines())
+                    time.sleep(2)
+    except KeyboardInterrupt:
+        print("Exiting program")
+
+    exit(0)
+
+if __name__ == "__main__":
+    main()