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deadprogram
129 lines
3.8 KiB
Go
129 lines
3.8 KiB
Go
// +build stm32,!stm32f103xx
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package machine
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import (
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"device/stm32"
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)
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// GPIO for the stm32 families except the stm32f1xx which uses a simpler but
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// less flexible mechanism. Extend the +build directive above to exclude other
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// models in the stm32f1xx series as necessary
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const (
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// Mode Flag
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PinOutput PinMode = 0
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PinInput PinMode = PinInputFloating
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PinInputFloating PinMode = 1
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PinInputPulldown PinMode = 2
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PinInputPullup PinMode = 3
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// for UART
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PinModeUARTTX PinMode = 4
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PinModeUARTRX PinMode = 5
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// for I2C
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PinModeI2CSCL PinMode = 6
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PinModeI2CSDA PinMode = 7
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// for SPI
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PinModeSPICLK PinMode = 8
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PinModeSPISDO PinMode = 9
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PinModeSPISDI PinMode = 10
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// for analog/ADC
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PinInputAnalog PinMode = 11
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// for PWM
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// TBD
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)
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// Configure this pin with the given configuration
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func (p Pin) Configure(config PinConfig) {
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// Use the default system alternate function; this
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// will only be used if you try to call this with
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// one of the peripheral modes instead of vanilla GPIO.
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p.ConfigureAltFunc(config, stm32.AF0_SYSTEM)
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}
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// Configure this pin with the given configuration including alternate
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// function mapping if necessary.
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func (p Pin) ConfigureAltFunc(config PinConfig, altFunc stm32.AltFunc) {
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// Configure the GPIO pin.
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p.enableClock()
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port := p.getPort()
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pin := uint8(p) % 16
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pos := pin * 2
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switch config.Mode {
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// GPIO
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case PinInputFloating:
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port.MODER.ReplaceBits(stm32.GPIOModeInput, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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case PinInputPulldown:
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port.MODER.ReplaceBits(stm32.GPIOModeInput, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRPullDown, 0x3, pos)
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case PinInputPullup:
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port.MODER.ReplaceBits(stm32.GPIOModeInput, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRPullUp, 0x3, pos)
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case PinOutput:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputGeneral, 0x3, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedHigh, 0x3, pos)
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// UART
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case PinModeUARTTX:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedHigh, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRPullUp, 0x3, pos)
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p.SetAltFunc(altFunc)
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case PinModeUARTRX:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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// I2C
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case PinModeI2CSCL:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OTYPER.ReplaceBits(stm32.GPIOOutputTypeOpenDrain, 0x1, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedLow, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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case PinModeI2CSDA:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OTYPER.ReplaceBits(stm32.GPIOOutputTypeOpenDrain, 0x1, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedLow, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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// SPI
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case PinModeSPICLK:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedLow, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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case PinModeSPISDO:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedLow, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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case PinModeSPISDI:
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port.MODER.ReplaceBits(stm32.GPIOModeOutputAltFunc, 0x3, pos)
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port.OSPEEDR.ReplaceBits(stm32.GPIOSpeedLow, 0x3, pos)
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port.PUPDR.ReplaceBits(stm32.GPIOPUPDRFloating, 0x3, pos)
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p.SetAltFunc(altFunc)
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}
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}
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// SetAltFunc maps the given alternative function to the I/O pin
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func (p Pin) SetAltFunc(af stm32.AltFunc) {
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port := p.getPort()
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pin := uint8(p) % 16
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pos := (pin % 8) * 4
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if pin < 8 {
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port.AFRL.ReplaceBits(uint32(af), 0xf, pos)
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} else {
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port.AFRH.ReplaceBits(uint32(af), 0xf, pos)
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}
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}
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