Raspi
import the stuff
import {
// runtimedata
// v1 and v2 have different layouts
o_raspi__v1,
o_raspi__v2,
a_n_u8_pin_direction_in,
a_n_u8_pin_direction_out,
a_n_u8_pin_state_high,
a_n_u8_pin_state_low,
f_b_arrays_equal,
f_pin_set_direction__from_o_pin,
f_pin_set_state__from_o_pin,
f_pin_set_state__from_o_pin_only_if_state_changed,
f_a_n_u8__pin_get_state__from_o_pin,
f_n__pin_get_state__from_o_pin,
f_s_pins_state_layout,
f_o_pin__from_o_raspi,
f_uninit_from_o_pin
}
from "./mod.js"
// from "https://deno.land/x/raspi@[n.n.n]/mod.js"get a pin reference
let o_pin__2 = await f_o_pin__from_o_raspi(
o_raspi__v2,
2, // GPIO pin number
a_n_u8_pin_direction_in // or a_n_u8_pin_direction_out
);read
let n_state = await f_n__pin_get_state__from_o_pin(
o_pin__2
)
console.log(n_state) // 1 or 0
console.log(o_pin__2.n_state) // 1 or 0
console.log(o_pin__2.v_n_mic_sec_wpn__last_read) // 1444064.188 (performance.now()*1000) //microseconds since script start
set direction
// to out
await f_pin_set_direction__from_o_pin(
o_pin__2,
a_n_u8_pin_direction_out
);write
await f_pin_set_state__from_o_pin(
o_pin__2,
(true)
? a_n_u8_pin_state_high // write 1
: a_n_u8_pin_state_low // write 0
);
console.log(o_pin__2.n_state) // 1
console.log(o_pin__2.v_n_mic_sec_wpn__last_read) // 1444064.188 (performance.now()*1000) //microseconds since script start
console.log(o_pin__2.v_n_mic_sec_wpn__last_write) // 1893212.299 (performance.now()*1000) //microseconds since script start write (only if state has changed)
// will write 1
await f_pin_set_state__from_o_pin_only_if_state_changed(
o_pin__2, a_n_u8_pin_state_high
);
// will not write 1 since last state was also 1,
await f_pin_set_state__from_o_pin_only_if_state_changed(
o_pin__2, a_n_u8_pin_state_high
);
// will not write 1 since last state was also 1,
await f_pin_set_state__from_o_pin_only_if_state_changed(
o_pin__2, a_n_u8_pin_state_high
);
// will not write 0
await f_pin_set_state__from_o_pin_only_if_state_changed(
o_pin__2, a_n_u8_pin_state_low
);
un-initialize
// it is highly recommend to un-init the pin before the programm ends
await f_uninit_from_o_pin(o_pin__2)
v1/v2 layout
returns the raspberry pi pins layout and it current states
- not exported ,< in , > out, ■ 1, □ 0
console.log(f_s_pins_state_layout(o_raspi__v1))
// raspi v1: Fri Apr 05 2024 01:31:24 GMT+0200 (Central European Summer Time).514
// |----------------------|----------------------|
// |_ 3v3 power |_ 5v power |
// |_ GPIO 0 (SDA) |_ 5v power |
// |_ GPIO 1 (SCL) |_ Ground |
// |_ GPIO 4 (GPCLK0) |_ GPIO 14 (TXD) |
// |_ Ground |_ GPIO 15 (RXD) |
// |_ GPIO 17 |_ GPIO 18 (PCM_CLK) |
// |_ GPIO 21 |_ Ground |
// |_ GPIO 22 |_ GPIO 23 |
// |_ 3v3 Power |_ GPIO 24 |
// |_ GPIO 10 |_ Ground |
// |_ GPIO 9 (MISO) |_ GPIO 25 |
// |_ GPIO 11 (SCLK) |_ GPIO 8 (CE0) |
// |_ Ground |_ GPIO 7 (CE1) |
// |----------------------|----------------------|
console.log(f_s_pins_state_layout(o_raspi__v2))
// raspi v2: Fri Apr 05 2024 01:31:58 GMT+0200 (Central European Summer Time).980
// |----------------------|----------------------|
// |_ 3v3 power |_ 5v power |
// |_ GPIO 2 (SDA) |_ 5v power |
// |_ GPIO 3 (SCL) |_ Ground |
// |_ GPIO 4 (GPCLK0) |_ GPIO 14 (TXD) |
// |_ Ground |_ GPIO 15 (RXD) |
// |_ GPIO 17 |_ GPIO 18 (PCM_CLK) |
// |_ GPIO 27 |_ Ground |
// |_ GPIO 22 |_ GPIO 23 |
// |_ 3v3 power |_ GPIO 24 |
// |_ GPIO 10 (MOSI) |_ Ground |
// |_ GPIO 9 (MISO) |_ GPIO 25 |
// |_ GPIO 11 (SCLK) |_ GPIO 8 (CEO) |
// |_ Ground |_ GPIO 7 (CE1) |
// |_ GPIO 0 (ID_SD) |_ GPIO 1 (ID_SD) |
// |_ GPIO 5 |_ Ground |
// |_ GPIO 6 |_ GPIO 12 (PWM0) |
// |_ GPIO 13 (PWM1) |_ Ground |
// |_ GPIO 19 (PCM_FS) |_ GPIO 16 |
// |_ GPIO 26 |_ GPIO 20 (PCM_DIN) |
// |_ Ground |_ GPIO 21 (PCM_DOUT)|
// |----------------------|----------------------|
example blink
let o_pin__2 = await f_o_pin__from_o_raspi(
o_raspi__v2,
2,
a_n_u8_pin_direction_out
);
let n = 0;
while(n < 10){
n+=1
await f_pin_set_state__from_o_pin(
o_pin__2,
(n % 2 == 0) ? a_n_u8_pin_state_high : a_n_u8_pin_state_low // write 'high' / n_pin_state_high / 1
);
// wait 500 ms
await new Promise((f_res)=>{setTimeout(()=>{return f_res(true)}, 500)})
}
example PWM (pulse width modulation)
this shows that a digital pulsewidth modulation is possible
pwm pulse width modulation is a technique where
the state changes quickly from low to high / 0 to 1
depending on how much time the pin is high the brightness of an led changes
this example should show the pin changing from dark to bright in a
sinusial wave
let o_pin__out2 = await f_o_pin__from_o_raspi(
o_raspi__v2,
2,
a_n_u8_pin_direction_out
);
let o_pin__out3 = await f_o_pin__from_o_raspi(
o_raspi__v2,
3,
a_n_u8_pin_direction_out
);
// test pulse width modulation
let n = 0;
let n_mic_sec_interval = 10000;
let n_duty_nor = 0.95;
let n_mic_sec_interval_duty = n_mic_sec_interval*n_duty_nor
let n_mic_sec_interval_nonduty = n_mic_sec_interval*(1.-n_duty_nor)
let n_mic_sec_delta_max = n_mic_sec_interval_duty;
while(n < 100000000){
n_duty_nor = Math.sin(n*0.000001)*.5+.5;
n_mic_sec_interval_duty = n_mic_sec_interval*n_duty_nor
n_mic_sec_interval_nonduty = n_mic_sec_interval*(1.-n_duty_nor)
if(o_pin__out2.n_state == 1){
n_mic_sec_delta_max = n_mic_sec_interval_duty;
}else{
n_mic_sec_delta_max = n_mic_sec_interval_nonduty;
}
// we make use of the property 'v_n_mic_sec_wpn__last_write' which holds a
// microseconds timestamp (wpn=>window.performance.now) time since script has started
const n_mic_sec_delta = performance.now()*1000 - o_pin__out2.v_n_mic_sec_wpn__last_write
//console.log(n_mic_sec_delta)
if(n_mic_sec_delta > n_mic_sec_delta_max){
await f_pin_set_state__from_o_pin(
o_pin__out2,
(o_pin__out2.n_state == 0)
? a_n_u8_pin_state_high
: a_n_u8_pin_state_low
);
await f_pin_set_state__from_o_pin(
o_pin__out3,
(o_pin__out3.n_state == 1)
? a_n_u8_pin_state_low
: a_n_u8_pin_state_high
);
}
n+=1;
}
await f_uninit_from_o_pin(o_pin__out2)
await f_uninit_from_o_pin(o_pin__out3)