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machine: make machine.I2C0 and similar objects pointers

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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
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src/machine/machine_stm32f405.go
+4 -4
View File
@@ -116,12 +116,12 @@ type I2C struct {
AltFuncSelector uint8
}
func (i2c I2C) configurePins(config I2CConfig) {
func (i2c *I2C) configurePins(config I2CConfig) {
config.SCL.ConfigureAltFunc(PinConfig{Mode: PinModeI2CSCL}, i2c.AltFuncSelector)
config.SDA.ConfigureAltFunc(PinConfig{Mode: PinModeI2CSDA}, i2c.AltFuncSelector)
}
func (i2c I2C) getFreqRange(config I2CConfig) uint32 {
func (i2c *I2C) getFreqRange(config I2CConfig) uint32 {
// all I2C interfaces are on APB1 (42 MHz)
clock := CPUFrequency() / 4
// convert to MHz
@@ -139,7 +139,7 @@ func (i2c I2C) getFreqRange(config I2CConfig) uint32 {
return clock << stm32.I2C_CR2_FREQ_Pos
}
func (i2c I2C) getRiseTime(config I2CConfig) uint32 {
func (i2c *I2C) getRiseTime(config I2CConfig) uint32 {
// These bits must be programmed with the maximum SCL rise time given in the
// I2C bus specification, incremented by 1.
// For instance: in Sm mode, the maximum allowed SCL rise time is 1000 ns.
@@ -155,7 +155,7 @@ func (i2c I2C) getRiseTime(config I2CConfig) uint32 {
return (freqRange + 1) << stm32.I2C_TRISE_TRISE_Pos
}
func (i2c I2C) getSpeed(config I2CConfig) uint32 {
func (i2c *I2C) getSpeed(config I2CConfig) uint32 {
ccr := func(pclk uint32, freq uint32, coeff uint32) uint32 {
return (((pclk - 1) / (freq * coeff)) + 1) & stm32.I2C_CCR_CCR_Msk
}