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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_atmega.go
+6 -1
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@@ -31,6 +31,11 @@ func (i2c *I2C) Configure(config I2CConfig) error {
// Activate internal pullups for twi.
avr.PORTC.SetBits((avr.DIDR0_ADC4D | avr.DIDR0_ADC5D))
return i2c.SetBaudRate(config.Frequency)
}
// SetBaudRate sets the communication speed for I2C.
func (i2c *I2C) SetBaudRate(br uint32) error {
// Initialize twi prescaler and bit rate.
avr.TWSR.SetBits((avr.TWSR_TWPS0 | avr.TWSR_TWPS1))
@@ -38,7 +43,7 @@ func (i2c *I2C) Configure(config I2CConfig) error {
// SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))
// NOTE: TWBR should be 10 or higher for controller mode.
// It is 72 for a 16mhz board with 100kHz TWI
avr.TWBR.Set(uint8(((CPUFrequency() / config.Frequency) - 16) / 2))
avr.TWBR.Set(uint8(((CPUFrequency() / br) - 16) / 2))
// Enable twi module.
avr.TWCR.Set(avr.TWCR_TWEN)