Servo PWM Pi C Library

C Library to use with Servo PWM Pi Raspberry Pi development  board.

The example C programs can be found in /ABElectronics_C_Libraries/ServoPi/demos

Downloading and Installing the library

To download to your Raspberry Pi type in the terminal:

git clone https://github.com/abelectronicsuk/ABElectronics_C_Libraries.git

Functions

servopi_init(uint8_t address, uint8_t use_oe_pin)

Initialise the Servo Pi - run before calling any other methods
Parameter: (uint8_t) address - I2C address
Parameter: (uint8_t) use_oe_pin - Enable the Output Enable pin on the GPIO port
Returns: (int) 0 = OK, 1 = GPIO enable failed, 2 = GPIO direction set failed

set_pwm_freq(double freq, uint8_t address)

Set the PWM frequency
Parameter: (double) freq - required frequency
Parameter: (uint8_t) address - I2C address
Returns: null

set_pwm(uint8_t channel, uint16_t on, uint16_t off, uint8_t address)

Set the output on single channels
Parameter: (uint8_t) channel - 1 to 16
Parameter: (uint16_t) on - period 0 to 4096
Parameter: (uint16_t) off - period 0 to 4096
Parameter: (uint8_t) address - I2C address
Returns: null

set_all_pwm(uint16_t on, uint16_t off, uint8_t address)

Set the output on all channels
Parameter: (uint16_t) on - period 0 to 4096
Parameter: (uint16_t) off - period 0 to 4096
Parameter: (uint8_t) address - I2C address
Returns: null

output_disable()

Disable the output via the OE pin
Returns: (int) 0 = OK, 1 = GPIO failed

output_enable()

Enable the output via the OE pin
Returns: (int) 0 = OK, 1 = GPIO failed

set_allcall_address(uint8_t allcalladdress, uint8_t address)

Set the I2C address for the All Call function
Parameter: (uint8_t) allcalladdress - New I2C All Call address
Parameter: (uint8_t) address - I2C address
Returns: null

enable_allcall_address(uint8_t address)

Enable the I2C address for the All Call function
Parameter: (uint8_t) address - I2C address
Returns: null

disable_allcall_address(uint8_t address)

Disable the I2C address for the All Call function
Parameter: (uint8_t) address - I2C address
Returns: null