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machine: make machine.I2C0 and similar objects pointers

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This makes it possible to assign I2C objects (machine.I2C0,
machine.I2C1, etc.) without needing to take a pointer.

This is important especially in the future when I2C may be driven using
DMA and the machine.I2C type needs to store some state.
This commit is contained in:
Ayke van Laethem
2021-02-06 12:37:15 +01:00
committed by Ron Evans
parent 71bbe93ab2
commit 90b42799a2
41 changed files with 129 additions and 136 deletions
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src/machine/i2c.go
+2 -2
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@@ -29,7 +29,7 @@ var (
// Many I2C-compatible devices are organized in terms of registers. This method
// is a shortcut to easily write to such registers. Also, it only works for
// devices with 7-bit addresses, which is the vast majority.
func (i2c I2C) WriteRegister(address uint8, register uint8, data []byte) error {
func (i2c *I2C) WriteRegister(address uint8, register uint8, data []byte) error {
buf := make([]uint8, len(data)+1)
buf[0] = register
copy(buf[1:], data)
@@ -42,6 +42,6 @@ func (i2c I2C) WriteRegister(address uint8, register uint8, data []byte) error {
// Many I2C-compatible devices are organized in terms of registers. This method
// is a shortcut to easily read such registers. Also, it only works for devices
// with 7-bit addresses, which is the vast majority.
func (i2c I2C) ReadRegister(address uint8, register uint8, data []byte) error {
func (i2c *I2C) ReadRegister(address uint8, register uint8, data []byte) error {
return i2c.Tx(uint16(address), []byte{register}, data)
}