nRF51 SDK
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GPIO abstraction

GPIO pin abstraction and port abstraction for reading and writing byte-wise to GPIO ports. More...

Enumerations

enum  nrf_gpio_port_dir_t {
  NRF_GPIO_PORT_DIR_OUTPUT,
  NRF_GPIO_PORT_DIR_INPUT
}
 Enumerator used for setting the direction of a GPIO port. More...
 
enum  nrf_gpio_pin_dir_t {
  NRF_GPIO_PIN_DIR_INPUT,
  NRF_GPIO_PIN_DIR_OUTPUT
}
 
enum  nrf_gpio_port_select_t {
  NRF_GPIO_PORT_SELECT_PORT0 = 0,
  NRF_GPIO_PORT_SELECT_PORT1,
  NRF_GPIO_PORT_SELECT_PORT2,
  NRF_GPIO_PORT_SELECT_PORT3
}
 Enumerator used for selecting between port 0 - 3. More...
 
enum  nrf_gpio_pin_pull_t {
  NRF_GPIO_PIN_NOPULL = GPIO_PIN_CNF_PULL_Disabled,
  NRF_GPIO_PIN_PULLDOWN = GPIO_PIN_CNF_PULL_Pulldown,
  NRF_GPIO_PIN_PULLUP = GPIO_PIN_CNF_PULL_Pullup,
  NRF_GPIO_PIN_NOPULL = GPIO_PIN_CNF_PULL_Disabled,
  NRF_GPIO_PIN_PULLDOWN = GPIO_PIN_CNF_PULL_Pulldown,
  NRF_GPIO_PIN_PULLUP = GPIO_PIN_CNF_PULL_Pullup
}
 

Functions

static __INLINE void nrf_gpio_range_cfg_output (uint32_t pin_range_start, uint32_t pin_range_end)
 Function for configuring the GPIO pin range as outputs with normal drive strength. This function can be used to configure pin range as simple output with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases). More...
 
static __INLINE void nrf_gpio_range_cfg_input (uint32_t pin_range_start, uint32_t pin_range_end, nrf_gpio_pin_pull_t pull_config)
 Function for configuring the GPIO pin range as inputs with given initial value set, hiding inner details. This function can be used to configure pin range as simple input. More...
 
static __INLINE void nrf_gpio_cfg_output (uint32_t pin_number)
 Function for configuring the given GPIO pin number as output with given initial value set, hiding inner details. This function can be used to configure pin range as simple input with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases). More...
 
static __INLINE void nrf_gpio_cfg_input (uint32_t pin_number, nrf_gpio_pin_pull_t pull_config)
 Function for configuring the given GPIO pin number as input with given initial value set, hiding inner details. This function can be used to configure pin range as simple input with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases). More...
 
static __INLINE void nrf_gpio_pin_dir_set (uint32_t pin_number, nrf_gpio_pin_dir_t direction)
 Function for setting the direction for a GPIO pin. More...
 
static __INLINE void nrf_gpio_pin_set (uint32_t pin_number)
 Function for setting a GPIO pin. More...
 
static __INLINE void nrf_gpio_pin_clear (uint32_t pin_number)
 Function for clearing a GPIO pin. More...
 
static __INLINE void nrf_gpio_pin_toggle (uint32_t pin_number)
 Function for toggling a GPIO pin. More...
 
static __INLINE void nrf_gpio_pin_write (uint32_t pin_number, uint32_t value)
 Function for writing a value to a GPIO pin. More...
 
static __INLINE uint32_t nrf_gpio_pin_read (uint32_t pin_number)
 Function for reading the input level of a GPIO pin. More...
 
static __INLINE void nrf_gpio_word_byte_write (volatile uint32_t *word_address, uint8_t byte_no, uint8_t value)
 Generic function for writing a single byte of a 32 bit word at a given address. More...
 
static __INLINE uint8_t nrf_gpio_word_byte_read (const volatile uint32_t *word_address, uint8_t byte_no)
 Generic function for reading a single byte of a 32 bit word at a given address. More...
 
static __INLINE void nrf_gpio_port_dir_set (nrf_gpio_port_select_t port, nrf_gpio_port_dir_t dir)
 Function for setting the direction of a port. More...
 
static __INLINE uint8_t nrf_gpio_port_read (nrf_gpio_port_select_t port)
 Function for reading a GPIO port. More...
 
static __INLINE void nrf_gpio_port_write (nrf_gpio_port_select_t port, uint8_t value)
 Function for writing to a GPIO port. More...
 
static __INLINE void nrf_gpio_port_set (nrf_gpio_port_select_t port, uint8_t set_mask)
 Function for setting individual pins on GPIO port. More...
 
static __INLINE void nrf_gpio_port_clear (nrf_gpio_port_select_t port, uint8_t clr_mask)
 Function for clearing individual pins on GPIO port. More...
 

Detailed Description

Here, the GPIO ports are defined as follows:

Enumeration Type Documentation

Enumerator
NRF_GPIO_PORT_DIR_OUTPUT 

Output.

NRF_GPIO_PORT_DIR_INPUT 

Input.

Pin direction definitions.

Enumerator
NRF_GPIO_PIN_DIR_INPUT 

Input.

NRF_GPIO_PIN_DIR_OUTPUT 

Output.

Enumerator
NRF_GPIO_PORT_SELECT_PORT0 

Port 0 (GPIO pin 0-7)

NRF_GPIO_PORT_SELECT_PORT1 

Port 1 (GPIO pin 8-15)

NRF_GPIO_PORT_SELECT_PORT2 

Port 2 (GPIO pin 16-23)

NRF_GPIO_PORT_SELECT_PORT3 

Port 3 (GPIO pin 24-31)

Enumerator
NRF_GPIO_PIN_NOPULL 

Pin pullup resistor disabled.

NRF_GPIO_PIN_PULLDOWN 

Pin pulldown resistor enabled.

NRF_GPIO_PIN_PULLUP 

Pin pullup resistor enabled.

NRF_GPIO_PIN_NOPULL 

Pin pullup resistor disabled.

NRF_GPIO_PIN_PULLDOWN 

Pin pulldown resistor enabled.

NRF_GPIO_PIN_PULLUP 

Pin pullup resistor enabled.

Function Documentation

static __INLINE void nrf_gpio_range_cfg_output ( uint32_t  pin_range_start,
uint32_t  pin_range_end 
)
static
Parameters
pin_range_startspecifies the start number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
pin_range_endspecifies the end number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
Note
For configuring only one pin as output use nrf_gpio_cfg_output Sense capability on the pin is disabled, and input is disconnected from the buffer as the pins are configured as output.
static __INLINE void nrf_gpio_range_cfg_input ( uint32_t  pin_range_start,
uint32_t  pin_range_end,
nrf_gpio_pin_pull_t  pull_config 
)
static
Parameters
pin_range_startspecifies the start number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
pin_range_endspecifies the end number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
pull_configState of the pin range pull resistor (no pull, pulled down or pulled high)
Note
For configuring only one pin as input use nrf_gpio_cfg_input Sense capability on the pin is disabled, and input is connected to buffer so that the GPIO->IN register is readable
static __INLINE void nrf_gpio_cfg_output ( uint32_t  pin_number)
static
Parameters
pin_numberspecifies the pin number of gpio pin numbers to be configured (allowed values 0-30)
Note
Sense capability on the pin is disabled, and input is disconnected from the buffer as the pins are configured as output.
static __INLINE void nrf_gpio_cfg_input ( uint32_t  pin_number,
nrf_gpio_pin_pull_t  pull_config 
)
static
Parameters
pin_numberspecifies the pin number of gpio pin numbers to be configured (allowed values 0-30)
pull_configState of the pin range pull resistor (no pull, pulled down or pulled high)
Note
Sense capability on the pin is disabled, and input is connected to buffer so that the GPIO->IN register is readable
static __INLINE void nrf_gpio_pin_dir_set ( uint32_t  pin_number,
nrf_gpio_pin_dir_t  direction 
)
static
Parameters
pin_numberspecifies the pin number [0:31] for which to set the direction.
directionspecifies the direction
static __INLINE void nrf_gpio_pin_set ( uint32_t  pin_number)
static

Note that the pin must be configured as an output for this function to have any effect.

Parameters
pin_numberspecifies the pin number [0:31] to set.
static __INLINE void nrf_gpio_pin_clear ( uint32_t  pin_number)
static

Note that the pin must be configured as an output for this function to have any effect.

Parameters
pin_numberspecifies the pin number [0:31] to clear.
static __INLINE void nrf_gpio_pin_toggle ( uint32_t  pin_number)
static

Note that the pin must be configured as an output for this function to have any effect.

Parameters
pin_numberspecifies the pin number [0:31] to toggle.
static __INLINE void nrf_gpio_pin_write ( uint32_t  pin_number,
uint32_t  value 
)
static

Note that the pin must be configured as an output for this function to have any effect.

Parameters
pin_numberspecifies the pin number [0:31] to write.
valuespecifies the value to be written to the pin.
  • 0 clears the pin
  • >=1 sets the pin.
static __INLINE uint32_t nrf_gpio_pin_read ( uint32_t  pin_number)
static

Note that the pin must have input connected for the value returned from this function to be valid.

Parameters
pin_numberspecifies the pin number [0:31] to read.
Returns
Return values
0if the pin input level is low.
1if the pin input level is high.
>1 should never occur.
static __INLINE void nrf_gpio_word_byte_write ( volatile uint32_t *  word_address,
uint8_t  byte_no,
uint8_t  value 
)
static

This function should not be called from outside the nrf_gpio abstraction layer.

Parameters
word_addressis the address of the word to be written.
byte_nois the the word byte number (0-3) to be written.
valueis the value to be written to byte "byte_no" of word at address "word_address"
static __INLINE uint8_t nrf_gpio_word_byte_read ( const volatile uint32_t *  word_address,
uint8_t  byte_no 
)
static

This function should not be called from outside the nrf_gpio abstraction layer.

Parameters
word_addressis the address of the word to be read.
byte_nois the the byte number (0-3) of the word to be read.
Returns
byte "byte_no" of word at address "word_address".
static __INLINE void nrf_gpio_port_dir_set ( nrf_gpio_port_select_t  port,
nrf_gpio_port_dir_t  dir 
)
static
Parameters
portis the port for which to set the direction.
dirdirection to be set for this port.
static __INLINE uint8_t nrf_gpio_port_read ( nrf_gpio_port_select_t  port)
static
Parameters
portis the port to read.
Returns
the input value on this port.
static __INLINE void nrf_gpio_port_write ( nrf_gpio_port_select_t  port,
uint8_t  value 
)
static
Parameters
portis the port to write.
valueis the value to write to this port.
See Also
nrf_gpio_port_dir_set()
static __INLINE void nrf_gpio_port_set ( nrf_gpio_port_select_t  port,
uint8_t  set_mask 
)
static
Parameters
portis the port for which to set the pins.
set_maskis a mask specifying which pins to set. A bit set to 1 indicates that the corresponding port pin shall be set.
See Also
nrf_gpio_port_dir_set()
static __INLINE void nrf_gpio_port_clear ( nrf_gpio_port_select_t  port,
uint8_t  clr_mask 
)
static
Parameters
portis the port for which to clear the pins.
clr_maskis a mask specifying which pins to clear. A bit set to 1 indicates that the corresponding port pin shall be cleared.
See Also
nrf_gpio_port_dir_set()