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i2c: added ReadBytes to I2CBus

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This commit is contained in:
Gavin Cabbage 2015-08-29 00:42:44 -04:00
parent 5065e49386
commit 2e6bd46354
2 changed files with 24 additions and 0 deletions
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22
host/generic/i2cbus.go
View File

@ -101,6 +101,28 @@ func (b *i2cBus) ReadByte(addr byte) (byte, error) {
return bytes[0], nil
}
func (b *i2cBus) ReadBytes(addr byte, num int) ([]byte, error) {
b.mu.Lock()
defer b.mu.Unlock()
if err := b.init(); err != nil {
return []byte{0}, err
}
if err := b.setAddress(addr); err != nil {
return []byte{0}, err
}
bytes := make([]byte, num)
n, _ := b.file.Read(bytes)
if n != num {
return []byte{0}, fmt.Errorf("i2c: Unexpected number (%v) of bytes read", n)
}
return bytes, nil
}
func (b *i2cBus) WriteByte(addr, value byte) error {
b.mu.Lock()
defer b.mu.Unlock()

2
i2c.go
View File

@ -4,6 +4,8 @@ package embd
// I2CBus interface is used to interact with the I2C bus.
type I2CBus interface {
// ReadByte reads a byte from the given address.
ReadBytes(addr byte, num int) (value []byte, err error)
// ReadByte reads a byte from the given address.
ReadByte(addr byte) (value byte, err error)
// WriteByte writes a byte to the given address.