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Ayke van Laethem
54169c714f
This simplifies adding more baremetal targets, like a GameBoy Advance, or baremetal x86 for unikernels.
33 lines
1.2 KiB
Go
33 lines
1.2 KiB
Go
// +build avr nrf sam stm32,!stm32f4disco
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package machine
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// TWI_FREQ is the I2C bus speed. Normally either 100 kHz, or 400 kHz for high-speed bus.
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const (
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TWI_FREQ_100KHZ = 100000
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TWI_FREQ_400KHZ = 400000
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)
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// WriteRegister transmits first the register and then the data to the
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// peripheral device.
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//
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// Many I2C-compatible devices are organized in terms of registers. This method
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// is a shortcut to easily write to such registers. Also, it only works for
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// devices with 7-bit addresses, which is the vast majority.
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func (i2c I2C) WriteRegister(address uint8, register uint8, data []byte) error {
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buf := make([]uint8, len(data)+1)
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buf[0] = register
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copy(buf[1:], data)
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return i2c.Tx(uint16(address), buf, nil)
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}
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// ReadRegister transmits the register, restarts the connection as a read
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// operation, and reads the response.
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//
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// Many I2C-compatible devices are organized in terms of registers. This method
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// is a shortcut to easily read such registers. Also, it only works for devices
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// with 7-bit addresses, which is the vast majority.
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func (i2c I2C) ReadRegister(address uint8, register uint8, data []byte) error {
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return i2c.Tx(uint16(address), []byte{register}, data)
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}
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