first commit

main.c

@@ -0,0 +1,124 @@
+#include <stdio.h>
+
+#include "ch32fun.h"
+#include "ch32v20xhw.h"
+#include "ethernetif.h"
+#include "lwip/dhcp.h"
+#include "lwip/init.h"
+#include "lwip/netif.h"
+#include "lwip/timeouts.h"
+#include "netif/ethernet.h"
+#include "systick.h"
+
+#define LED1_PIN 0
+#define LED2_PIN 2
+
+#define RCC_PREDIV1_OFFSET 0
+
+struct netif g_netif;
+
+void init_leds() {
+  RCC->APB2PCENR |= RCC_APB2Periph_GPIOA;
+  GPIOA->CFGLR &= ~((0xf << (4 * 0)) | (0xf << (4 * 2)));
+  GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP) << (4 * 0);
+  GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP) << (4 * 2);
+}
+
+int main() {
+  SystemInit();
+
+  // 1. HSE (32MHz)
+  // 2. PREDIV1 / 4.
+  // 3. PLL source = HSE, PLL x15.
+  // 4. (32MHz / 4) * 15 = 120MHz SYSCLK
+
+  RCC->INTR = 0x009F0000;
+  RCC->CTLR &= ~(RCC_HSE_ON | RCC_PLLON);
+  RCC->CFGR0 = 0x00000000;
+  RCC->CTLR |= RCC_HSE_ON;
+
+  int timeout;
+  for (timeout = 10000; timeout > 0; timeout--) {
+    if (RCC->CTLR & RCC_HSERDY) break;  // wait for HSE
+  }
+  if (timeout == 0) {
+    printf("Error: HSE failed to start\n");
+    return -1;
+  }
+
+  RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+  RCC->CFGR2 = ((3) << 0);  // PREDIV1 divisor = 3+1 = 4
+  RCC->CFGR0 |= RCC_PLLSource_HSE_Div1 | RCC_PLLMul_15;
+
+  RCC->CTLR |= RCC_PLLON;
+  printf("Main PLL enabled. Waiting for lock...\n");
+  for (timeout = 10000; timeout > 0; timeout--) {
+    if (RCC->CTLR & RCC_PLLRDY) break;
+  }
+  if (timeout == 0) {
+    printf("error: main pll lock failed\n");
+    return -1;
+  }
+  printf("Main PLL Locked\n");
+
+  RCC->CFGR0 = (RCC->CFGR0 & ~RCC_SW) | RCC_SW_PLL;
+
+  while ((RCC->CFGR0 & RCC_SWS) != RCC_SWS_PLL);
+
+  printf("SysClock set to 120MHz\n");
+
+  systick_init();
+  init_leds();
+
+  lwip_init();
+
+  ip_addr_t ipaddr, netmask, gw;
+  IP4_ADDR(&ipaddr, 0, 0, 0, 0);
+  IP4_ADDR(&netmask, 0, 0, 0, 0);
+  IP4_ADDR(&gw, 0, 0, 0, 0);
+
+  netif_add(&g_netif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init,
+            &ethernet_input);
+
+  netif_set_default(&g_netif);
+  netif_set_up(&g_netif);
+
+  dhcp_start(&g_netif);
+
+  ethernetif_init(&g_netif);
+
+  uint32_t last_led_toggle = 0;
+  uint32_t last_send_time = 0;
+  int led_state = 0;
+
+  while (1) {
+    ethernetif_link_poll(&g_netif);
+
+    if (netif_is_link_up(&g_netif)) {
+      ethernetif_input(&g_netif);
+    }
+
+    sys_check_timeouts();
+
+    // run_tx_test();
+
+    uint32_t now = millis();
+
+    if (now - last_led_toggle > 500) {
+      if (led_state) {
+        GPIOA->BSHR = (1 << 0);
+      } else {
+        GPIOA->BSHR = (1 << (0 + 16));
+      }
+      led_state = !led_state;
+      last_led_toggle = now;
+    }
+
+    static int ip_printed = 0;
+    if (g_netif.ip_addr.addr != 0 && !ip_printed) {
+      printf("IP address assigned: %s\n",
+             ip4addr_ntoa(netif_ip4_addr(&g_netif)));
+      ip_printed = 1;
+    }
+  }
+}