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machine/i2c: add interface check and implementation where missing for SetBaudRate() (#3406)

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* machine/i2c: add interface check and placeholder implementation where missing for SetBaudRate()
This commit is contained in:
Ron Evans
2023-10-14 13:17:24 +02:00
committed by GitHub
parent 72b715fa99
commit 935a293106
11 changed files with 104 additions and 42 deletions
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src/machine/machine_nrf.go
+18 -6
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@@ -246,13 +246,8 @@ func (i2c *I2C) Configure(config I2CConfig) error {
i2c.setPins(config.SCL, config.SDA)
i2c.mode = config.Mode
if i2c.mode == I2CModeController {
if config.Frequency >= 400*KHz {
i2c.Bus.FREQUENCY.Set(nrf.TWI_FREQUENCY_FREQUENCY_K400)
} else {
i2c.Bus.FREQUENCY.Set(nrf.TWI_FREQUENCY_FREQUENCY_K100)
}
i2c.SetBaudRate(config.Frequency)
i2c.enableAsController()
} else {
@@ -262,6 +257,23 @@ func (i2c *I2C) Configure(config I2CConfig) error {
return nil
}
// SetBaudRate sets the I2C frequency. It has the side effect of also
// enabling the I2C hardware if disabled beforehand.
//
//go:inline
func (i2c *I2C) SetBaudRate(br uint32) error {
switch {
case br >= 400*KHz:
i2c.Bus.SetFREQUENCY(nrf.TWI_FREQUENCY_FREQUENCY_K400)
case br >= 250*KHz:
i2c.Bus.SetFREQUENCY(nrf.TWI_FREQUENCY_FREQUENCY_K250)
default:
i2c.Bus.SetFREQUENCY(nrf.TWI_FREQUENCY_FREQUENCY_K100)
}
return nil
}
// signalStop sends a stop signal to the I2C peripheral and waits for confirmation.
func (i2c *I2C) signalStop() error {
tries := 0