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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_stm32f103.go
+5 -5
View File
@@ -201,7 +201,7 @@ func (spi SPI) configurePins(config SPIConfig) {
// Since the first interface is named I2C1, both I2C0 and I2C1 refer to I2C1.
// TODO: implement I2C2.
var (
I2C1 = I2C{Bus: stm32.I2C1}
I2C1 = (*I2C)(unsafe.Pointer(stm32.I2C1))
I2C0 = I2C1
)
@@ -209,7 +209,7 @@ type I2C struct {
Bus *stm32.I2C_Type
}
func (i2c I2C) configurePins(config I2CConfig) {
func (i2c *I2C) configurePins(config I2CConfig) {
if config.SDA == PB9 {
// use alternate I2C1 pins PB8/PB9 via AFIO mapping
stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_AFIOEN)
@@ -220,7 +220,7 @@ func (i2c I2C) configurePins(config I2CConfig) {
config.SCL.Configure(PinConfig{Mode: PinOutput50MHz + PinOutputModeAltOpenDrain})
}
func (i2c I2C) getFreqRange(config I2CConfig) uint32 {
func (i2c *I2C) getFreqRange(config I2CConfig) uint32 {
// pclk1 clock speed is main frequency divided by PCLK1 prescaler (div 2)
pclk1 := CPUFrequency() / 2
@@ -229,7 +229,7 @@ func (i2c I2C) getFreqRange(config I2CConfig) uint32 {
return pclk1 / 1000000
}
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.
@@ -245,7 +245,7 @@ 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
}