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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_fe310.go
+13 -5
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@@ -229,9 +229,10 @@ type I2CConfig struct {
SDA Pin
}
var i2cClockFrequency uint32 = 32000000
// Configure is intended to setup the I2C interface.
func (i2c *I2C) Configure(config I2CConfig) error {
var i2cClockFrequency uint32 = 32000000
if config.Frequency == 0 {
config.Frequency = 100 * KHz
}
@@ -241,7 +242,17 @@ func (i2c *I2C) Configure(config I2CConfig) error {
config.SCL = I2C0_SCL_PIN
}
var prescaler = i2cClockFrequency/(5*config.Frequency) - 1
i2c.SetBaudRate(config.Frequency)
config.SDA.Configure(PinConfig{Mode: PinI2C})
config.SCL.Configure(PinConfig{Mode: PinI2C})
return nil
}
// SetBaudRate sets the communication speed for I2C.
func (i2c *I2C) SetBaudRate(br uint32) error {
var prescaler = i2cClockFrequency/(5*br) - 1
// disable controller before setting the prescale registers
i2c.Bus.CTR.ClearBits(sifive.I2C_CTR_EN)
@@ -253,9 +264,6 @@ func (i2c *I2C) Configure(config I2CConfig) error {
// enable controller
i2c.Bus.CTR.SetBits(sifive.I2C_CTR_EN)
config.SDA.Configure(PinConfig{Mode: PinI2C})
config.SCL.Configure(PinConfig{Mode: PinI2C})
return nil
}