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maixbit (uart): serial is working with echo example

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This commit is contained in:
Yannis Huber
2020-06-16 14:55:55 +02:00
committed by Ron Evans
parent 75bcbbe6d8
commit dfab1aa717
11 changed files with 263 additions and 27 deletions
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src/runtime/runtime_k210.go
+24 -14
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@@ -20,15 +20,11 @@ func postinit() {}
//export main
func main() {
// Only use one core for the moment
if riscv.MHARTID.Get() == 0 {
// Zero the PLIC enable bits at startup.
for i := 0; i < ((kendryte.IRQ_max + 32) / 32); i++ {
kendryte.PLIC.TARGET_ENABLES[0].ENABLE[i].Set(0) // core 0
}
// Both harts should disable all interrupts on startup.
initPLIC()
// Zero the PLIC threshold bits to allow all interrupts.
kendryte.PLIC.TARGETS[0].THRESHOLD.Set(0)
// Only use one hart for the moment.
if riscv.MHARTID.Get() == 0 {
// Reset all interrupt source priorities to zero.
for i := 0; i < kendryte.IRQ_max; i++ {
@@ -56,14 +52,26 @@ func main() {
}
}
func initPLIC() {
hartId := riscv.MHARTID.Get()
// Zero the PLIC enable bits at startup.
for i := 0; i < ((kendryte.IRQ_max + 32) / 32); i++ {
kendryte.PLIC.TARGET_ENABLES[hartId].ENABLE[i].Set(0)
}
// Zero the PLIC threshold bits to allow all interrupts.
kendryte.PLIC.TARGETS[hartId].THRESHOLD.Set(0)
}
//go:extern handleInterruptASM
var handleInterruptASM [0]uintptr
//export handleInterrupt
func handleInterrupt() {
cause := riscv.MCAUSE.Get()
code := uint(cause &^ (1 << 31))
if cause&(1<<31) != 0 {
code := uint64(cause &^ (1 << 63))
if cause&(1<<63) != 0 {
// Topmost bit is set, which means that it is an interrupt.
switch code {
case 7: // Machine timer interrupt
@@ -73,12 +81,14 @@ func handleInterrupt() {
// this interrupt returns.
riscv.MIE.ClearBits(1 << 7) // MTIE bit
case 11: // Machine external interrupt
hartId := riscv.MHARTID.Get()
// Claim this interrupt.
id := kendryte.PLIC.TARGETS[0].CLAIM.Get()
id := kendryte.PLIC.TARGETS[hartId].CLAIM.Get()
// Call the interrupt handler, if any is registered for this ID.
callInterruptHandler(int(0))
callInterruptHandler(int(id))
// Complete this interrupt.
kendryte.PLIC.TARGETS[0].CLAIM.Set(id)
kendryte.PLIC.TARGETS[hartId].CLAIM.Set(id)
}
} else {
// Topmost bit is clear, so it is an exception of some sort.
@@ -133,7 +143,7 @@ func sleepTicks(d timeUnit) {
// handleException is called from the interrupt handler for any exception.
// Exceptions can be things like illegal instructions, invalid memory
// read/write, and similar issues.
func handleException(code uint) {
func handleException(code uint64) {
// For a list of exception codes, see:
// https://content.riscv.org/wp-content/uploads/2019/08/riscv-privileged-20190608-1.pdf#page=49
print("fatal error: exception with mcause=")