OneBus

HAPI bus protocol components — I2C, SPI, UART, 1-Wire, I2C GPIO expander. Parameterized on chip from OneChip.

Components

I2c<Chip> — I2C/TWI master

static void    init(uint32_t freq = 100000UL);
static bool    start(uint8_t addr, bool write);
static void    stop();
static bool    write(uint8_t data);
static uint8_t read(bool ack);

Spi<Chip> — SPI master

static void    init(uint8_t clockDiv = 4);
static void    select();
static void    deselect();
static uint8_t transfer(uint8_t data);
static void    transferBuf(uint8_t* buf, uint16_t len);

Uart<Chip> — UART

static void    init(uint32_t baud);
static void    write(uint8_t data);
static uint8_t read();
static bool    available();

OneWire<Chip> — 1-Wire bus

static void reset();
static void write(uint8_t data);
static uint8_t read();

I2cGpio<TwiMaster, Addr, InitShadow> — PCF8574 I2C GPIO expander

Virtual output pins over I2C. Used by OneIO LCD backpack driver.

using Port = I2cGpio<MyI2c, 0x27, 0x08>;   // InitShadow=0x08: backlight on
using RS   = Port::Pin<0>;
using EN   = Port::Pin<2>;
RS::on(); EN::off();

Usage

Components compose with HAPI chains. Chip implementations live in OneChip.

#include <oneBus/i2c.h>
using MyI2c = oneBus::I2c<hw::avr::AvrChip>;
MyI2c::Part::init(400000UL);