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all: add compiler support for interrupts

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This commit lets the compiler know about interrupts and allows
optimizations to be performed based on that: interrupts are eliminated
when they appear to be unused in a program. This is done with a new
pseudo-call (runtime/interrupt.New) that is treated specially by the
compiler.
This commit is contained in:
Ayke van Laethem
2019-12-15 14:16:22 +01:00
committed by Ron Evans
parent 3729fcfa9e
commit a5ed993f8d
36 changed files with 766 additions and 199 deletions
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src/machine/machine_atsamd21.go
+14 -14
View File
@@ -11,6 +11,7 @@ import (
"device/arm"
"device/sam"
"errors"
"runtime/interrupt"
"unsafe"
)
@@ -292,9 +293,10 @@ func waitADCSync() {
// UART on the SAMD21.
type UART struct {
Buffer *RingBuffer
Bus *sam.SERCOM_USART_Type
SERCOM uint8
Buffer *RingBuffer
Bus *sam.SERCOM_USART_Type
SERCOM uint8
Interrupt interrupt.Interrupt
}
var (
@@ -401,10 +403,7 @@ func (uart UART) Configure(config UARTConfig) error {
uart.Bus.INTENSET.Set(sam.SERCOM_USART_INTENSET_RXC)
// Enable RX IRQ.
// IRQ lines are in the same order as SERCOM instance numbers on SAMD21
// chips, so the IRQ number can be trivially determined from the SERCOM
// number.
arm.EnableIRQ(sam.IRQ_SERCOM0 + uint32(uart.SERCOM))
uart.Interrupt.Enable()
return nil
}
@@ -432,11 +431,12 @@ func (uart UART) WriteByte(c byte) error {
return nil
}
// defaultUART1Handler handles the UART1 IRQ.
func defaultUART1Handler() {
// handleInterrupt should be called from the appropriate interrupt handler for
// this UART instance.
func (uart *UART) handleInterrupt(interrupt.Interrupt) {
// should reset IRQ
UART1.Receive(byte((UART1.Bus.DATA.Get() & 0xFF)))
UART1.Bus.INTFLAG.SetBits(sam.SERCOM_USART_INTFLAG_RXC)
uart.Receive(byte((uart.Bus.DATA.Get() & 0xFF)))
uart.Bus.INTFLAG.SetBits(sam.SERCOM_USART_INTFLAG_RXC)
}
// I2C on the SAMD21.
@@ -1368,7 +1368,8 @@ func (usbcdc USBCDC) Configure(config UARTConfig) {
sam.USB_DEVICE.CTRLA.SetBits(sam.USB_DEVICE_CTRLA_ENABLE)
// enable IRQ
arm.EnableIRQ(sam.IRQ_USB)
intr := interrupt.New(sam.IRQ_USB, handleUSB)
intr.Enable()
}
func handlePadCalibration() {
@@ -1414,8 +1415,7 @@ func handlePadCalibration() {
sam.USB_DEVICE.PADCAL.SetBits(calibTrim << sam.USB_DEVICE_PADCAL_TRIM_Pos)
}
//go:export USB_IRQHandler
func handleUSB() {
func handleUSB(intr interrupt.Interrupt) {
// reset all interrupt flags
flags := sam.USB_DEVICE.INTFLAG.Get()
sam.USB_DEVICE.INTFLAG.Set(flags)