nrf51/include/periph_cpu.h

nRF51 specific definitions for handling peripherals

CLOCK_CORECLOCK

System core clock speed, fixed to 16MHz for all NRF51x CPUs.

(16000000U)

UART_IRQN

Redefine some peripheral names to unify them between nRF51 and 52.

(UART0_IRQn)

SPI_SCKSEL

(dev(bus)->PSELSCK)

SPI_MOSISEL

(dev(bus)->PSELMOSI)

SPI_MISOSEL

(dev(bus)->PSELMISO)

HAVE_I2C_SPEED_T

Override I2C speed settings.

enum i2c_speed_t

I2C_SPEED_LOW = 0x01

not supported

I2C_SPEED_NORMAL = 100000U

normal mode: ~100kbit/s

I2C_SPEED_FAST = 400000U

fast mode: ~400kbit/s

I2C_SPEED_FAST_PLUS = 0x02

not supported

I2C_SPEED_HIGH = 0x03

not supported

PERIPH_I2C_NEED_READ_REG

Use read reg function from periph common.

PERIPH_I2C_NEED_WRITE_REG

Use write reg function from periph common.

HAVE_ADC_RES_T

Override ADC resolution values.

enum adc_res_t

ADC_RES_7BIT =             (0 << 4)

ADC resolution: 7 bit.

ADC_RES_9BIT =             (1 << 4)

ADC resolution: 9 bit.

ADC_RES_11BIT

ADC resolution: 11 bit.

ADC_RES_6BIT =             (0xa00)

not supported by hardware

ADC_RES_8BIT =             (0xb00)

not supported by hardware

ADC_RES_10BIT =             (2 << 4)

ADC resolution: 10 bit.

ADC_RES_12BIT =             (3 << 4)

ADC resolution: 12 bit.

ADC_RES_14BIT =             (0xc00)

not supported by hardware

ADC_RES_16BIT =             (0xd00)

not supported by hardware

struct i2c_conf_t

I2C configuration options.

Structure for I2C configuration data.

I2C (TWI) configuration options.

I2C configuration structure.

I2C device configuration.

cc2538/include/periph_cpu.h::i2c_speed_t speed

baudrate used for the bus

i2c bus speed

Bus speed.

bus speed

Configured bus speed, actual speed may be lower but never higher.

gpio.h::gpio_t scl_pin

pin used for SCL

scl pin number

used SCL pin

SCL GPIO pin.

gpio.h::gpio_t sda_pin

pin used for SDA

sda pin number

used MOSI pin

SDA GPIO pin.

I2C_TypeDef * dev

USART device used.

i2c device

uint32_t loc

location of I2C pins

CMU_Clock_TypeDef cmu

the device CMU channel

cc2538.h::IRQn_Type irq

the devices base IRQ channel

uint32_t speed

the bus speed

I2C_Type * i2c

Pointer to hardware module registers.

uint32_t freq

I2C module clock frequency, usually CLOCK_BUSCLOCK or CLOCK_CORECLOCK.

cc2538.h::IRQn_Type irqn

IRQ number for this module.

uint32_t scl_pcr

PORT module PCR setting for the SCL pin.

uint32_t sda_pcr

PORT module PCR setting for the SDA pin.

NRF_TWI_Type * dev

hardware device

uint8_t pin_scl

SCL pin.

uint8_t pin_sda

SDA pin.

uint8_t ppi

PPI channel to use.

NRF_TWIM_Type * dev

TWIM hardware device.

uint8_t scl

SCL pin.

uint8_t sda

SDA pin.

SercomI2cm * dev

pointer to the used I2C device

sam0_common/include/periph_cpu_common.h::gpio_mux_t mux

alternate function (mux)

uint8_t gclk_src

GCLK source which supplys SERCOM.

uint8_t flags

allow SERCOM to run in standby mode

stm32_common/include/periph_cpu_common.h::gpio_af_t scl_af

scl pin alternate function value

stm32_common/include/periph_cpu_common.h::gpio_af_t sda_af

sda pin alternate function value

uint8_t bus

APB bus.

uint32_t rcc_mask

bit in clock enable register

uint8_t irqn

I2C event interrupt number.