sw/device/examples/gpio_button_led/gpio_button_led.c

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#include "hw/top_matcha/sw/autogen/top_matcha.h"
#include "sw/device/lib/arch/device.h"
#include "sw/device/lib/dif/dif_gpio.h"
#include "sw/device/lib/dif/dif_pinmux.h"
#include "sw/device/lib/dif/dif_rv_plic.h"
#include "sw/device/lib/dif/dif_uart.h"
#include "sw/device/lib/runtime/hart.h"
#include "sw/device/lib/runtime/irq.h"
#include "sw/device/lib/testing/test_framework/check.h"
#include "sw/device/lib/testing/test_framework/ottf_test_config.h"
#include "sw/device/lib/testing/test_framework/test_util.h"

static dif_gpio_t gpio;
static dif_pinmux_t pinmux;
static dif_rv_plic_t plic;
static dif_uart_t uart;

// GPIOs 0-7 will be connected to LEDs.
// GPIOs 8-13 will be connected to switches.
// For more details on the port assignments, please consult
// hw/top_matcha/data/pins_nexus.xdc.
static dif_pinmux_index_t leds[] = {
    kTopMatchaPinmuxMioOutIoa8, kTopMatchaPinmuxMioOutIob0,
    kTopMatchaPinmuxMioOutIob1, kTopMatchaPinmuxMioOutIob2,
    kTopMatchaPinmuxMioOutIob3, kTopMatchaPinmuxMioOutIob4,
    kTopMatchaPinmuxMioOutIob5, kTopMatchaPinmuxMioOutIob6,
};

static dif_pinmux_index_t switches[] = {
    kTopMatchaPinmuxInselIor5,  kTopMatchaPinmuxInselIor6,
    kTopMatchaPinmuxInselIor7,  kTopMatchaPinmuxInselIor10,
    kTopMatchaPinmuxInselIor11, kTopMatchaPinmuxInselIor12,
};

OTTF_DEFINE_TEST_CONFIG();

void ottf_external_isr(void) {
  dif_rv_plic_irq_id_t interrupt_id;
  CHECK_DIF_OK(
      dif_rv_plic_irq_claim(&plic, kTopMatchaPlicTargetIbex0, &interrupt_id));

  top_matcha_plic_peripheral_t peripheral_id =
      top_matcha_plic_interrupt_for_peripheral[interrupt_id];
  CHECK(peripheral_id == kTopMatchaPlicPeripheralGpio,
        "ISR got an interrupt from a non-GPIO");

  dif_gpio_irq_t gpio_num = interrupt_id - kTopMatchaPlicIrqIdGpioGpio0;
  CHECK_DIF_OK(dif_gpio_irq_acknowledge(&gpio, gpio_num));
  bool gpio_state;
  CHECK_DIF_OK(dif_gpio_read(&gpio, gpio_num, &gpio_state));
  CHECK_DIF_OK(dif_gpio_write(&gpio, gpio_num - ARRAYSIZE(leds), !gpio_state));

  CHECK_DIF_OK(
      dif_rv_plic_irq_complete(&plic, kTopMatchaPlicTargetIbex0, interrupt_id));
}

void _ottf_main(void) {
  // Initialize the UART to enable logging for non-DV simulation platforms.
  if (kDeviceType != kDeviceSimDV) {
    init_uart(TOP_MATCHA_UART0_BASE_ADDR, &uart);
  }
  CHECK_DIF_OK(
      dif_gpio_init(mmio_region_from_addr(TOP_MATCHA_GPIO_BASE_ADDR), &gpio));

  CHECK_DIF_OK(dif_pinmux_init(
      mmio_region_from_addr(TOP_MATCHA_PINMUX_AON_BASE_ADDR), &pinmux));
  CHECK_DIF_OK(dif_rv_plic_init(
      mmio_region_from_addr(TOP_MATCHA_RV_PLIC_BASE_ADDR), &plic));
  for (size_t i = 0; i < ARRAYSIZE(leds); ++i) {
    dif_pinmux_index_t pin = kTopMatchaPinmuxOutselGpioGpio0 + i;
    CHECK_DIF_OK(dif_pinmux_output_select(&pinmux, leds[i], pin));
    CHECK_DIF_OK(dif_gpio_output_set_enabled(&gpio, i, kDifToggleEnabled));
    CHECK_DIF_OK(dif_gpio_write(&gpio, i, false));
  }
  for (size_t i = ARRAYSIZE(leds); i < ARRAYSIZE(switches) + ARRAYSIZE(leds);
       ++i) {
    dif_pinmux_index_t pin = kTopMatchaPinmuxPeripheralInGpioGpio0 + i;
    int switch_index = (i - ARRAYSIZE(leds));
    CHECK_DIF_OK(dif_pinmux_input_select(&pinmux, pin, switches[switch_index]));
    CHECK_DIF_OK(dif_gpio_output_set_enabled(&gpio, i, kDifToggleDisabled));
    CHECK_DIF_OK(dif_gpio_irq_set_trigger(&gpio, 1 << i,
                                          kDifGpioIrqTriggerEdgeRisingFalling));
    CHECK_DIF_OK(dif_gpio_irq_set_enabled(&gpio, kDifGpioIrqGpio0 + i,
                                          kDifToggleEnabled));
    CHECK_DIF_OK(dif_rv_plic_irq_set_priority(
        &plic, kTopMatchaPlicIrqIdGpioGpio0 + i, kDifRvPlicMaxPriority));
    CHECK_DIF_OK(dif_rv_plic_irq_set_enabled(
        &plic, kTopMatchaPlicIrqIdGpioGpio0 + i, kTopMatchaPlicTargetIbex0,
        kDifToggleEnabled));
  }
  for (size_t i = ARRAYSIZE(leds) + ARRAYSIZE(switches); i < 32; ++i) {
    dif_pinmux_index_t in_pin = kTopMatchaPinmuxPeripheralInGpioGpio0 + i;
    dif_pinmux_index_t out_pin = kTopMatchaPinmuxOutselGpioGpio0 + i;
    CHECK_DIF_OK(dif_pinmux_input_select(&pinmux, in_pin,
                                         kTopMatchaPinmuxInselConstantZero));
    CHECK_DIF_OK(dif_pinmux_output_select(
        &pinmux, kTopMatchaPinmuxOutselConstantHighZ, out_pin));
  }
  irq_global_ctrl(true);
  irq_external_ctrl(true);

  int led_a = 6, led_b = 7;
  while (true) {
    CHECK_DIF_OK(dif_gpio_write(&gpio, led_a, false));
    CHECK_DIF_OK(dif_gpio_write(&gpio, led_b, true));
    led_a ^= led_b;
    led_b ^= led_a;
    led_a ^= led_b;
    busy_spin_micros(100 * 1000);
  }
  __builtin_unreachable();
}