Uart Tx - Raspberry Pi Pico Python SDK Manual

Raspberry Pi Pico Python SDK
16 wrap_target()
17 label("bitloop")
18 out(x, 1)
19 jmp(not_x, "do_zero")
20 jmp("bitloop")
21 label("do_zero")
22 nop()
23 wrap()
24
25
26 # Create the StateMachine with the ws2812 program, outputting on Pin(22).
27 sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(22))
28
29 # Start the StateMachine, it will wait for data on its FIFO.
30 sm.active(1)
31
32 # Display a pattern on the LEDs via an array of LED RGB values.
33 ar = array.array("I",
34
35 # Cycle colours.
36 for i in
37 for
38
39
40
41
42
43
44 sm.put(ar, 8)
45 time.sleep_ms(50)
46
47 # Fade out.
48 for i in range(24):
49 for
50
51 sm.put(ar, 8)
52 time.sleep_ms(50)

3.9.3. UART TX

A UART TX example,
Pico MicroPython Examples:
1 # Example using PIO to create a UART TX interface
2
3 from
4 from
5
6 UART_BAUD =
7 PIN_BASE =
8 NUM_UARTS =
9
10
11 @asm_pio(sideset_init=PIO.OUT_HIGH, out_init=PIO.OUT_HIGH, out_shiftdir=PIO.SHIFT_RIGHT)
12 def uart_tx():
13 # Block with TX deasserted until data available
14 pull()
15 # Initialise bit counter, assert start bit for 8 cycles
16 set(x, 7)
3.9. PIO Support
.side(0)
.side(1)
.side(1)
.side(0)
[0 for _ in range(NUM_LEDS)])
range(4 * NUM_LEDS):
j in range(NUM_LEDS):
r = j * 100 // (NUM_LEDS - 1)
b = 100 - j * 100 // (NUM_LEDS - 1)
if j != i % NUM_LEDS:
r >>= 3
b >>= 3
ar[j] = r << 16 | b
j in range(NUM_LEDS):
ar[j] >>= 1
https://github.com/raspberrypi/pico-micropython-examples/tree/master/pio/pio_uart_tx.py
machine import Pin
rp2 import PIO, StateMachine, asm_pio
115200
10
8
.side(0)
[T3 - 1]
[T1 - 1]
[T2 - 1]
[T2 - 1]
[7]
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