synth/arm/main.cc

#include "async.h"
#include "aum1_cm1.h"
#include "buffer.h"
#include "crash.h"
#include "gpio.h"
#include "timer.h"
#include "trace.h"
#include "uart.h"

namespace {
using async::AwaitableType;

void HandleUartRxFromIsr(void*, unsigned int) {
    tracing::trace(tracing::TraceEvent::kUartRxCb);
    async::resume(AwaitableType::kUartRx);
}

void Uart0Isr() {
    tracing::trace(tracing::TraceEvent::kUartIsr);
    XUartLite_InterruptHandler(uart0);
}

void Timer0Isr() {
    tracing::dump();
    __builtin_trap();
}

void SetupUart() {
    InitUarts();

    auto* vector_table = reinterpret_cast<uint32_t*>(0x0);
    vector_table[16 + HardFault_IRQn] =
        reinterpret_cast<uint32_t>(crash::HardFaultHandler);

    vector_table[16 + Uart0_IRQn] = reinterpret_cast<uint32_t>(Uart0Isr);
    vector_table[16 + Timer0_IRQn] = reinterpret_cast<uint32_t>(Timer0Isr);
    NVIC_SetPriority(Uart0_IRQn, 3);
    NVIC_EnableIRQ(Uart0_IRQn);

    XUartLite_SetSendHandler(uart0, HandleUartTxFromIsr, nullptr);
    XUartLite_SetRecvHandler(uart0, HandleUartRxFromIsr, nullptr);
    XUartLite_EnableInterrupt(uart0);
}

void SetupTimer() {
    NVIC_EnableIRQ(Timer0_IRQn);
    timer0->SetupAsWdt(100000 * 4000);
    timer0->EnableT1();
}
}  // namespace

async::task<buffer> UartRead(int size) {
    auto buff = buffer::make(size);
    auto* data = reinterpret_cast<uint8_t*>(buff.data.data());
    size_t received = XUartLite_Recv(uart0, data, buff.data.size());
    if (received < buff.data.size()) {
        co_await async::await(AwaitableType::kUartRx);
    }
    co_return buff;
}

async::task<> echo() {
    while (1) {
        buffer buff = co_await UartRead(1);
        UartSend(buff.data);
    }
}

int main() {
    SetupUart();
    SetupTimer();

    async::schedule(echo().h);

    async::main_loop([]() {
        static int cnt = 0;
        timer0->Pet();
        if ((cnt++ % 100000) == 0) {
            ToggleLed(0);
        }
    });
    // should never get here
}