tinygo-org/tinygo
1
0
Fork 0
mirror of https://github.com/tinygo-org/tinygo.git synced 2026-08-09 05:23:40 +00:00
Code Issues Packages Projects Releases 6 Wiki Activity

machine: make machine.I2C0 and similar objects pointers

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files
src/machine/machine_atmega.go
+7 -7
View File
@@ -14,7 +14,7 @@ type I2C struct {
}
// I2C0 is the only I2C interface on most AVRs.
var I2C0 = I2C{}
var I2C0 *I2C = nil
// I2CConfig is used to store config info for I2C.
type I2CConfig struct {
@@ -22,7 +22,7 @@ type I2CConfig struct {
}
// Configure is intended to setup the I2C interface.
func (i2c I2C) Configure(config I2CConfig) error {
func (i2c *I2C) Configure(config I2CConfig) error {
// Default I2C bus speed is 100 kHz.
if config.Frequency == 0 {
config.Frequency = TWI_FREQ_100KHZ
@@ -49,7 +49,7 @@ func (i2c I2C) Configure(config I2CConfig) error {
// Tx does a single I2C transaction at the specified address.
// It clocks out the given address, writes the bytes in w, reads back len(r)
// bytes and stores them in r, and generates a stop condition on the bus.
func (i2c I2C) Tx(addr uint16, w, r []byte) error {
func (i2c *I2C) Tx(addr uint16, w, r []byte) error {
if len(w) != 0 {
i2c.start(uint8(addr), true) // start transmission for writing
for _, b := range w {
@@ -70,7 +70,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
}
// start starts an I2C communication session.
func (i2c I2C) start(address uint8, write bool) {
func (i2c *I2C) start(address uint8, write bool) {
// Clear TWI interrupt flag, put start condition on SDA, and enable TWI.
avr.TWCR.Set((avr.TWCR_TWINT | avr.TWCR_TWSTA | avr.TWCR_TWEN))
@@ -87,7 +87,7 @@ func (i2c I2C) start(address uint8, write bool) {
}
// stop ends an I2C communication session.
func (i2c I2C) stop() {
func (i2c *I2C) stop() {
// Send stop condition.
avr.TWCR.Set(avr.TWCR_TWEN | avr.TWCR_TWINT | avr.TWCR_TWSTO)
@@ -97,7 +97,7 @@ func (i2c I2C) stop() {
}
// writeByte writes a single byte to the I2C bus.
func (i2c I2C) writeByte(data byte) {
func (i2c *I2C) writeByte(data byte) {
// Write data to register.
avr.TWDR.Set(data)
@@ -110,7 +110,7 @@ func (i2c I2C) writeByte(data byte) {
}
// readByte reads a single byte from the I2C bus.
func (i2c I2C) readByte() byte {
func (i2c *I2C) readByte() byte {
// Clear TWI interrupt flag and enable TWI.
avr.TWCR.Set(avr.TWCR_TWEN | avr.TWCR_TWINT | avr.TWCR_TWEA)