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upm
0.5.1
Sensor/Actuator repository for libmraa (v0.9.1)
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upm
0.5.1
Sensor/Actuator repository for libmraa (v0.9.1)
|
API for the NLGPIO16 16 channel USB GPIO Module. More...
The NLGPIO16 is a USB adapter providing access to 16 GPIO's, 7 of which can be used as analog inputs. The GPIO's are 3.3v only. An external power supply can be connected to provide more current if the need arises.
It is recommended to use a series resistor with the GPIO/ADC pins when interfacing with other circuits. In output mode, GPIOs can source up to 8mA (gpio8-gpio15). So no additional circuitry is needed to drive regular LEDs. A 470 Ohms series resistor is recommended for current limiting when connecting an LED to a GPIO. In contrast to GPIOs, analog inputs can read voltages at any level between 0 to 3.3V volts. It is recommended to use a series resistor to protect the input from stray voltages and spikes. The internal Analog to Digital converter supports 10 bits resolution which is adequate for most applications.
Maximum IO source/sink current on GPIO 0-7 is 2mA Maximum IO source/sink current on GPIO 8-15 is 8mA
Public Member Functions | |
| NLGPIO16 (std::string uart=NLGPIO16_DEFAULT_UART_DEV) | |
| ~NLGPIO16 () | |
| std::string | getVersion () |
| std::string | getID () |
| void | setID (std::string id) |
| void | gpioSet (int gpio) |
| void | gpioClear (int gpio) |
| bool | gpioRead (int gpio) |
| unsigned int | gpioReadAll () |
| void | gpioSetIOMask (int mask) |
| void | gpioSetIODir (int mask) |
| void | gpioWriteAll (int mask) |
| int | analogReadValue (int adc) |
| float | analogReadVolts (int adc) |
Protected Member Functions | |
| bool | dataAvailable (unsigned int millis) |
| std::string | readStr (int len) |
| int | writeStr (std::string data) |
| std::string | sendCommand (std::string cmd) |
Protected Attributes | |
| mraa::Uart | m_uart |
| NLGPIO16 | ( | std::string | uart = NLGPIO16_DEFAULT_UART_DEV | ) |
NLGPIO16 object constructor
| uart | UART device path to use. Default is /dev/ttyACM0. |
| string getVersion | ( | ) |
Get the version of the device
| string getID | ( | ) |
Get the device ID. The device ID is an 8 character alpha-numeric string.
| void setID | ( | std::string | id | ) |
Set the device ID. The device ID is an 8 character alpha-numeric string. The supplied ID must be exactly 8 characters in length.
| id | String containing a new 8 character device ID |
| void gpioSet | ( | int | gpio | ) |
Set a gpio output to the HIGH (1) state. The gpio is automatically set as an output when this call is made, regardless of it's previous mode.
| gpio | The gpio to set. Valid values are between 0-15 |
| void gpioClear | ( | int | gpio | ) |
Set a gpio output to the LOW (0) state. The gpio is automatically set as an output when this call is made, regardless of it's previous mode.
| gpio | The gpio to clear. Valid values are between 0-15 |
| bool gpioRead | ( | int | gpio | ) |
Read the state of a gpio. The gpio is automatically set as an input when this call is made, regardless of it's previous mode.
| gpio | The gpio to read. Valid values are between 0-15 |
| unsigned int gpioReadAll | ( | ) |
Read the state of all gpios. The returned integer is a bitmask of all 16 gpios, where a 0 bit means the gpio is in the LOW state, whereas a 1 bit means the gpio is in a HIGH state.
| void gpioSetIOMask | ( | int | mask | ) |
Set a mask for selectively updating multiple gpios with the gpioIODir() and gpioWriteAll() methods. Each bit set in the 16 bit argument (LSB = gpio0) represents whether the two previously mentioned methods will act on a given gpio or not. A 0 in a given bit position will cause any update to that gpio via gpioIODir() and gpioWriteAll() to be ignored, while a 1 bit enables that gpio to be affected by those two methods.
| mask | A bitmask of the 16 gpios affected by gpioIODir() and gpioWriteAll() |
| void gpioSetIODir | ( | int | mask | ) |
Set the driection mode (input or output) for all gpios enabled by gpioSetIOMask(). A 0 in a given bit postion (LSB = gpio0) configures the gpio as an ouput, and a 1 bit configures the gpio as an input. Only the gpios enabled by gpioSetMask() are affected by this call.
| mask | A bitmask of the 16 gpios whose direction mode is to be set |
| void gpioWriteAll | ( | int | mask | ) |
Write all enabled gpios (set via gpioSetIOMask()) to a given value. A 1 bit (LSB = gpio0) sets the given output to HIGH, a zero sets the given output to LOW. Only the gpios enabled by gpioSetMask() are affected by this call.
| mask | The values to set for the 16 gpios (LSB = gpio0) |
| int analogReadValue | ( | int | adc | ) |
Read the raw analog input value present at the given gpio. The gpio is switched to analog input mode by this call, regardless of any previous mode. The returned value will be a number between 0-1023 (10 bit resolution). Only the first 7 gpios (0-6) can be used for analog input.
| adc | The gpio number to read (0-6) |
| float analogReadVolts | ( | int | adc | ) |
Read the raw analog input value present at the given gpio and return the coresponding voltage value at the pin. The gpio is switched to analog input mode by this call, regardless of any previous mode. The returned value will be a number between 0.0-3.3, depending on the voltage present at the pin. Only the first 7 gpios (0-6) can be used for analog input.
| adc | The gpio number to read (0-6) |
1.8.6
