Skip to content

Instantly share code, notes, and snippets.

@feelfreetofee

feelfreetofee/led.lua

Created June 30, 2024 00:39
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save feelfreetofee/88f6d9fa8053e60fcc9384ef524579d3 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save feelfreetofee/88f6d9fa8053e60fcc9384ef524579d3 to your computer and use it in GitHub Desktop.
Download ZIP
WiringPi Lua GPIO
Raw
led.lua
local uv = require('uv')
local gpio = require('./wiringPi.lua')
gpio.wiringPiSetup()
local led = 2
local led_state = gpio.digitalRead(led)
gpio.pinMode(led, 1) -- OUTPUT
while true do
led_state = led_state == 1 and 0 or 1
gpio.digitalWrite(led, led_state)
uv.sleep(500)
end
Raw
switch.lua
local uv = require('uv')
local gpio = require('./wiringPi.lua')
gpio.wiringPiSetup()
local switch = 0
local switch_state = 1
gpio.pinMode(switch, 0) -- INPUT
gpio.pullUpDnControl(switch, 2) -- PULLED UP
function cb()
print(('Button %s'):format(switch_state == 1 and 'released' or 'pressed'))
end
while true do
if gpio.digitalRead(switch) ~= switch_state then
switch_state = switch_state == 1 and 0 or 1
cb()
uv.sleep(300)
end
end
Raw
switch_led.lua
local uv = require('uv')
local gpio = require('./wiringPi.lua')
gpio.wiringPiSetup()
local switch = 0
local switch_state = 1
gpio.pinMode(switch, 0) -- INPUT
gpio.pullUpDnControl(switch, 2) -- PULLED UP
local led = 2
local led_state = gpio.digitalRead(led)
gpio.pinMode(led, 1) -- OUTPUT
function cb()
if switch_state == 1 then
led_state = led_state == 1 and 0 or 1
gpio.digitalWrite(led, led_state)
end
end
while true do
if gpio.digitalRead(switch) ~= switch_state then
switch_state = switch_state == 1 and 0 or 1
cb()
uv.sleep(300)
end
end
Raw
wiringPi.lua
local ffi = require('ffi')
ffi.cdef[[
// Core wiringPi functions
enum WPIPinType {
WPI_PIN_BCM = 1,
WPI_PIN_WPI,
WPI_PIN_PHYS,
};
void wiringPiVersion (int *major, int *minor);
int wiringPiGlobalMemoryAccess(void); // Interface V3.3
int wiringPiUserLevelAccess (void);
int wiringPiSetup (void);
int wiringPiSetupSys (void);
int wiringPiSetupGpio (void);
int wiringPiSetupPhys (void);
int wiringPiSetupPinType (enum WPIPinType pinType); // Interface V3.3
int wiringPiSetupGpioDevice(enum WPIPinType pinType); // Interface V3.3
enum WPIPinAlt {
WPI_ALT_UNKNOWN = -1,
WPI_ALT_INPUT = 0,
WPI_ALT_OUTPUT,
WPI_ALT5,
WPI_ALT4,
WPI_ALT0,
WPI_ALT1,
WPI_ALT2,
WPI_ALT3,
WPI_ALT6,
WPI_ALT7,
WPI_ALT8,
WPI_ALT9,
WPI_NONE = 0x1F, // Pi5 default
};
int wiringPiGpioDeviceGetFd(); // Interface V3.3
void pinModeAlt(int pin, int mode);
enum WPIPinAlt getPinModeAlt(int pin); // Interface V3.5, same as getAlt but wie enum
void pinMode(int pin, int mode);
void pullUpDnControl(int pin, int pud);
int digitalRead(int pin);
void digitalWrite(int pin, int value);
unsigned int digitalRead8(int pin);
void digitalWrite8(int pin, int value);
void pwmWrite(int pin, int value);
int analogRead(int pin);
void analogWrite(int pin, int value);
// On-Board Raspberry Pi hardware specific stuff
int piGpioLayout(void);
int piBoardRev(void); // Deprecated, but does the same as piGpioLayout
void piBoardId(int *model, int *rev, int *mem, int *maker, int *overVolted);
int wpiPinToGpio(int wpiPin);
int physPinToGpio(int physPin);
void setPadDrive(int group, int value);
void setPadDrivePin(int pin, int value); // Interface V3.0
int getAlt(int pin);
void pwmToneWrite(int pin, int freq);
void pwmSetMode(int mode);
void pwmSetRange(unsigned int range);
void pwmSetClock(int divisor);
void gpioClockSet(int pin, int freq);
unsigned int digitalReadByte(void);
unsigned int digitalReadByte2(void);
void digitalWriteByte(int value);
void digitalWriteByte2(int value);
// Interrupts
// (Also Pi hardware specific)
int waitForInterrupt(int pin, int mS);
int wiringPiISR(int pin, int mode, void (*function)(void));
int wiringPiISRStop(int pin); // V3.2
int waitForInterruptClose(int pin); // V3.2
// Threads
int piThreadCreate(void *(*fn)(void *));
void piLock(int key);
void piUnlock(int key);
// Schedulling priority
int piHiPri(const int pri);
]]
return ffi.load('wiringPi.so')
-- local definitions {
-- -- wiringPi modes
-- WPI_MODE_PINS = 0,
-- WPI_MODE_GPIO = 1,
-- WPI_MODE_GPIO_SYS = 2, -- deprecated since 3.2
-- WPI_MODE_PHYS = 3,
-- WPI_MODE_PIFACE = 4,
-- WPI_MODE_GPIO_DEVICE_BCM = 5, -- BCM pin numbers like WPI_MODE_GPIO
-- WPI_MODE_GPIO_DEVICE_WPI = 6, -- WiringPi pin numbers like WPI_MODE_PINS
-- WPI_MODE_GPIO_DEVICE_PHYS = 7, -- Physic pin numbers like WPI_MODE_PHYS
-- WPI_MODE_UNINITIALISED = -1,
-- -- Pin modes
-- INPUT = 0,
-- OUTPUT = 1,
-- PWM_OUTPUT = 2,
-- GPIO_CLOCK = 3,
-- SOFT_PWM_OUTPUT = 4,
-- SOFT_TONE_OUTPUT = 5,
-- PWM_TONE_OUTPUT = 6,
-- PM_OFF = 7, -- to input / release line
-- LOW = 0,
-- HIGH = 1,
-- -- Pull up/down/none
-- PUD_OFF = 0,
-- PUD_DOWN = 1,
-- PUD_UP = 2,
-- -- PWM
-- PWM_MODE_MS = 0,
-- PWM_MODE_BAL = 1,
-- Interrupt levels
-- INT_EDGE_SETUP = 0,
-- INT_EDGE_FALLING = 1,
-- INT_EDGE_RISING = 2,
-- INT_EDGE_BOTH = 3
-- }
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment