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Fixes for UART2 on Metro M4 Airlift Lite (#739)

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* machine/samd51: Fixes for UART2
This commit is contained in:
BCG
2019-11-21 15:45:13 -05:00
committed by Ron Evans
parent c09724bfc5
commit ea5df0f214
4 changed files with 74 additions and 21 deletions
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src/machine/machine_atsamd51.go
+49 -5
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@@ -473,6 +473,13 @@ var (
Buffer: NewRingBuffer(),
Mode: PinSERCOMAlt,
}
// The second hardware serial port on the SAMD51. Uses the SERCOM0 interface.
UART2 = UART{
Buffer: NewRingBuffer(),
Bus: sam.SERCOM0_USART_INT,
Mode: PinSERCOMAlt,
}
)
const (
@@ -522,6 +529,8 @@ func (uart UART) Configure(config UARTConfig) {
}
switch config.RX {
case PA06:
rxpad = sercomRXPad2
case PA07:
rxpad = sercomRXPad3
case PA11:
@@ -591,11 +600,20 @@ func (uart UART) Configure(config UARTConfig) {
// setup interrupt on receive
uart.Bus.INTENSET.Set(sam.SERCOM_USART_INT_INTENSET_RXC)
// Enable RX IRQ. Currently assumes SERCOM3.
arm.EnableIRQ(sam.IRQ_SERCOM3_0)
arm.EnableIRQ(sam.IRQ_SERCOM3_1)
arm.EnableIRQ(sam.IRQ_SERCOM3_2)
arm.EnableIRQ(sam.IRQ_SERCOM3_OTHER)
// Enable RX IRQ.
switch uart.Bus {
case sam.SERCOM0_USART_INT:
arm.EnableIRQ(sam.IRQ_SERCOM0_0)
arm.EnableIRQ(sam.IRQ_SERCOM0_1)
arm.EnableIRQ(sam.IRQ_SERCOM0_2)
arm.EnableIRQ(sam.IRQ_SERCOM0_OTHER)
default:
// Currently assumes SERCOM3
arm.EnableIRQ(sam.IRQ_SERCOM3_0)
arm.EnableIRQ(sam.IRQ_SERCOM3_1)
arm.EnableIRQ(sam.IRQ_SERCOM3_2)
arm.EnableIRQ(sam.IRQ_SERCOM3_OTHER)
}
}
// SetBaudRate sets the communication speed for the UART.
@@ -647,6 +665,32 @@ func handleUART1() {
UART1.Bus.INTFLAG.SetBits(sam.SERCOM_USART_INT_INTFLAG_RXC)
}
//go:export SERCOM0_0_IRQHandler
func handleSERCOM0_0() {
handleUART2()
}
//go:export SERCOM0_1_IRQHandler
func handleSERCOM0_1() {
handleUART2()
}
//go:export SERCOM0_2_IRQHandler
func handleSERCOM0_2() {
handleUART2()
}
//go:export SERCOM0_OTHER_IRQHandler
func handleSERCOM0_OTHER() {
handleUART2()
}
func handleUART2() {
// should reset IRQ
UART2.Receive(byte((UART2.Bus.DATA.Get() & 0xFF)))
UART2.Bus.INTFLAG.SetBits(sam.SERCOM_USART_INT_INTFLAG_RXC)
}
// I2C on the SAMD51.
type I2C struct {
Bus *sam.SERCOM_I2CM_Type