main.c

// Copyright (c) 2022 Cesanta Software Limited
// All rights reserved

#include "mcu.h"
#include "mongoose.h"

static volatile uint32_t s_ticks;
void SysTick_Handler(void) { s_ticks++; }     // IRQ handler
uint64_t mg_millis(void) { return s_ticks; }  // For Mongoose

int main(void) {
  uint16_t led = PIN('B', 7);            // Blue LED
  clock_init();                          // Run at 180Mhz
  systick_init(SYS_FREQUENCY / 1000);    // Tick every 1 ms
  gpio_set_mode(led, GPIO_MODE_OUTPUT);  // Set blue LED to output mode
  uart_init(UART3, 115200);              // Initialise UART
  uint32_t timer = 0, period = 500;      // Declare timer and 500ms period

  // Initialise Ethernet. Enable MAC GPIO pins, see
  // https://www.farnell.com/datasheets/2014265.pdf section 6.10
  uint16_t pins[] = {PIN('A', 1),  PIN('A', 2),  PIN('A', 7),
                     PIN('B', 13), PIN('C', 1),  PIN('C', 4),
                     PIN('C', 5),  PIN('G', 11), PIN('G', 13)};
  for (size_t i = 0; i < sizeof(pins) / sizeof(pins[0]); i++) {
    gpio_init(pins[i], GPIO_MODE_AF, 0, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
  }
  NVIC_EnableIRQ(ETH_IRQn);                     // Setup Ethernet IRQ handler
  RCC->APB2ENR |= BIT(14);                      // Enable SYSCFG
  SYSCFG->PMC |= BIT(23);                       // Use RMII. Goes first!
  RCC->AHB1ENR |= BIT(25) | BIT(26) | BIT(27);  // Enable Ethernet clocks
  RCC->AHB1RSTR |= BIT(25);                     // ETHMAC force reset
  RCC->AHB1RSTR &= ~BIT(25);                    // ETHMAC release reset

  struct mg_mgr mgr;        // Initialise Mongoose event manager
  mg_mgr_init(&mgr);        // and attach it to the MIP interface
  mg_log_set(MG_LL_DEBUG);  // Set log level

  // Initialise Mongoose network stack
  // Specify MAC address, and use 0 for IP, mask, GW - i.e. use DHCP
  // For static configuration, specify IP/mask/GW in network byte order
  struct mip_driver_stm32 driver_data = {.mdc_cr = 4};  // See driver_stm32.h
  struct mip_if mif = {
      .mac = {2, 0, 1, 2, 3, 5},
      .use_dhcp = true,
      .driver = &mip_driver_stm32,
      .driver_data = &driver_data,
  };
  mip_init(&mgr, &mif);
  extern void device_dashboard_fn(struct mg_connection *, int, void *, void *);
  mg_http_listen(&mgr, "http://0.0.0.0", device_dashboard_fn, &mgr);
  MG_INFO(("Init done, starting main loop"));

  for (;;) {
    if (timer_expired(&timer, period, s_ticks)) {
      static bool on;       // This block is executed
      gpio_write(led, on);  // Every `period` milliseconds
      on = !on;             // Toggle LED state
      printf("LED: %d, tick: %lu\r\n", on, s_ticks);  // Write message
    }
    mg_mgr_poll(&mgr, 0);  // Handle networking
  }
  return 0;
}