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i2csoft: use cycle counting for delays

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This should make the software I2C driver more portable, and potentially
usable on chips that aren't yet supported. More importantly, it avoids
some guesswork in the various chip-specific timing code.
This commit is contained in:
Ayke van Laethem
2023-05-03 23:03:29 +02:00
committed by Ron Evans
parent 9fdf0d657d
commit aac959eb7b
7 changed files with 8 additions and 95 deletions
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i2csoft/i2csoft.go
+8
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@@ -3,6 +3,9 @@ package i2csoft
import (
"errors"
"machine"
"time"
"tinygo.org/x/drivers/delay"
)
// I2C is an I2C implementation by Software. Since it is implemented by
@@ -278,3 +281,8 @@ func (i2c *I2C) WriteRegister(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)
}
// wait waits for half the time of the SCL operation interval.
func (i2c *I2C) wait() {
delay.Sleep(50 * time.Microsecond) // half of a 100kHz cycle (50µs)
}
i2csoft/i2csoft_atsamd51.go
-16
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@@ -1,16 +0,0 @@
//go:build atsamd51 || atsame5x
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval. It is set to
// about 100 kHz.
func (i2c *I2C) wait() {
wait := 20
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}
i2csoft/i2csoft_esp32.go
-16
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@@ -1,16 +0,0 @@
//go:build esp32
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval. It is set to
// about 100 kHz.
func (i2c *I2C) wait() {
wait := 60
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}
i2csoft/i2csoft_nrf52840.go
-16
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@@ -1,16 +0,0 @@
//go:build nrf52840
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval. It is set to
// about 100 kHz.
func (i2c *I2C) wait() {
wait := 26
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}
i2csoft/i2csoft_other.go
-15
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@@ -1,15 +0,0 @@
//go:build !esp32 && !atsamd51 && !atsame5x && !stm32f4 && !rp2040 && !nrf52840
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval.
func (i2c *I2C) wait() {
wait := 20
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}
i2csoft/i2csoft_rp2040.go
-16
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@@ -1,16 +0,0 @@
//go:build rp2040
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval. It is set to
// about 100 kHz.
func (i2c *I2C) wait() {
wait := 50
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}
i2csoft/i2csoft_stm32f4.go
-16
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@@ -1,16 +0,0 @@
//go:build stm32f4
package i2csoft
import (
"device"
)
// wait waits for half the time of the SCL operation interval. It is set to
// about 100 kHz.
func (i2c *I2C) wait() {
wait := 77
for i := 0; i < wait; i++ {
device.Asm(`nop`)
}
}