Fix WCH example

examples/wch/ch32v307-make-baremetal-builtin/Makefile

@@ -7,7 +7,7 @@ CFLAGS += -ffunction-sections -fdata-sections -fno-common
 CFLAGS += -DSYSCLK_FREQ_144MHz_HSE -I. -Ivendor -g3 -Os
 CFLAGS += -march=rv32imafc -mabi=ilp32 $(CFLAGS_EXTRA)
 LDFLAGS = -T vendor/link.ld -nostartfiles --specs=nano.specs --specs=nosys.specs -Wl,--gc-sections
-SOURCES = main.c mongoose.c net.c packed_fs.c
+SOURCES = hal.c main.c mongoose.c net.c packed_fs.c
 SOURCES += vendor/system_ch32v30x.c vendor/startup_ch32v30x_D8C.S
 CFLAGS += -DHTTP_URL=\"http://0.0.0.0/\" -DHTTPS_URL=\"https://0.0.0.0/\"
 

examples/wch/ch32v307-make-baremetal-builtin/hal.c

@@ -0,0 +1,142 @@
+// Copyright (c) 2024 Cesanta Software Limited
+// All rights reserved
+
+#include <sys/stat.h>  // For _fstat()
+#include "hal.h"
+
+extern void SystemCoreClockUpdate(void);
+
+void SysTick_Init(void) {
+  SysTick->CMP = SystemCoreClock / 1000 - 1;
+  SysTick->CNT = 0;
+  SysTick->SR = 0;
+  SysTick->CTLR = BIT(0) | BIT(1) | BIT(2) | BIT(3);
+  NVIC_EnableIRQ(SysTicK_IRQn);
+}
+
+#if 0
+void SystemInit(void) {  // Called automatically by startup code
+  SystemCoreClockUpdate();
+}
+#endif
+
+static volatile uint64_t s_ticks;  // Milliseconds since boot
+__attribute__((interrupt())) void SysTick_Handler(void) {
+  s_ticks++;
+  SysTick->SR = 0;
+}
+
+void mg_random(void *buf, size_t len) {  // Use on-board RNG
+  for (size_t n = 0; n < len; n += sizeof(uint32_t)) {
+    uint32_t r = rng_read();
+    memcpy((char *) buf + n, &r, n + sizeof(r) > len ? len - n : sizeof(r));
+  }
+}
+
+uint64_t mg_millis(void) {  // Let Mongoose use our uptime function
+  return s_ticks;           // Return number of milliseconds since boot
+}
+
+void hal_init(void) {
+  SystemCoreClockUpdate();
+  SysTick_Init();
+  uart_init(UART_DEBUG, 115200);
+  gpio_output(LED_PIN);
+  ethernet_init();
+  rng_init();
+}
+
+// Newlib syscalls. Implemented are: _sbrk() for malloc, and _write()
+int _fstat(int fd, struct stat *st) {
+  (void) fd, (void) st;
+  return -1;
+}
+
+extern unsigned char _end[];  // End of data section, start of heap. See link.ld
+static unsigned char *s_current_heap_end = _end;
+
+size_t hal_ram_used(void) {
+  return (size_t) (s_current_heap_end - _end);
+}
+
+size_t hal_ram_free(void) {
+  unsigned char endofstack;
+  return (size_t) (&endofstack - s_current_heap_end);
+}
+
+void *_sbrk(int incr) {
+  unsigned char *prev_heap;
+  unsigned char *heap_end = (unsigned char *) ((size_t) &heap_end - 256);
+  prev_heap = s_current_heap_end;
+  // Check how much space we  got from the heap end to the stack end
+  if (s_current_heap_end + incr > heap_end) return (void *) -1;
+  s_current_heap_end += incr;
+  return prev_heap;
+}
+
+int _open(const char *path) {
+  (void) path;
+  return -1;
+}
+
+int _close(int fd) {
+  (void) fd;
+  return -1;
+}
+
+int _isatty(int fd) {
+  (void) fd;
+  return 1;
+}
+
+int _lseek(int fd, int ptr, int dir) {
+  (void) fd, (void) ptr, (void) dir;
+  return 0;
+}
+
+void _exit(int status) {
+  (void) status;
+  for (;;) (void) 0;
+}
+
+void _kill(int pid, int sig) {
+  (void) pid, (void) sig;
+}
+
+int _getpid(void) {
+  return -1;
+}
+
+int _write(int fd, char *ptr, int len) {
+  (void) fd, (void) ptr, (void) len;
+  if (fd == 1) uart_write_buf(UART_DEBUG, ptr, (size_t) len);
+  return -1;
+}
+
+int _read(int fd, char *ptr, int len) {
+  (void) fd, (void) ptr, (void) len;
+  return -1;
+}
+
+int _link(const char *a, const char *b) {
+  (void) a, (void) b;
+  return -1;
+}
+
+int _unlink(const char *a) {
+  (void) a;
+  return -1;
+}
+
+int _stat(const char *path, struct stat *st) {
+  (void) path, (void) st;
+  return -1;
+}
+
+int mkdir(const char *path, mode_t mode) {
+  (void) path, (void) mode;
+  return -1;
+}
+
+void _init(void) {
+}

examples/wch/ch32v307-make-baremetal-builtin/hal.h

@@ -5,6 +5,11 @@
 
 #define UART_DEBUG USART1
 
+#define BTN_PIN PIN('B', 3)    // On-board user button
+#define LED1_PIN PIN('A', 15)  // On-board red LED
+#define LED2_PIN PIN('B', 4)   // On-board blue LED
+#define LED_PIN LED2_PIN
+
 #include <ch32v30x.h>
 
 #include <stdbool.h>
@@ -19,8 +24,10 @@
 #define PINBANK(pin) (pin >> 8)
 
 extern uint32_t SystemCoreClock;
-extern void SystemInit(void);
-extern void SystemCoreClockUpdate(void);
+
+void hal_init(void);
+size_t hal_ram_free(void);
+size_t hal_ram_used(void);
 
 static inline void spin(volatile uint32_t count) {
   while (count--) (void) 0;

examples/wch/ch32v307-make-baremetal-builtin/main.c

@@ -4,30 +4,8 @@
 #include "mongoose.h"
 #include "net.h"
 
-#define BTN_PIN PIN('B', 3)    // On-board user button
-#define LED1_PIN PIN('A', 15)  // On-board red LED
-#define LED2_PIN PIN('B', 4)   // On-board blue LED
-#define LED_PIN LED2_PIN
-
 #define BLINK_PERIOD_MS 1000  // LED_PIN blinking period in millis
 
-static volatile uint64_t s_ticks;  // Milliseconds since boot
-__attribute__((interrupt())) void SysTick_Handler(void) {
-  s_ticks++;
-  SysTick->SR = 0;
-}
-
-uint64_t mg_millis(void) {  // Let Mongoose use our uptime function
-  return s_ticks;           // Return number of milliseconds since boot
-}
-
-void mg_random(void *buf, size_t len) {  // Use on-board RNG
-  for (size_t n = 0; n < len; n += sizeof(uint32_t)) {
-    uint32_t r = rng_read();
-    memcpy((char *) buf + n, &r, n + sizeof(r) > len ? len - n : sizeof(r));
-  }
-}
-
 // This flash space resides at after the 0-wait 320k area
 static char *s_flash_space = (char *) (0x8000000 + 320 * 1024);
 
@@ -45,41 +23,27 @@ static void timer_fn(void *arg) {
   gpio_toggle(LED_PIN);                                  // Blink LED_PIN
   struct mg_tcpip_if *ifp = arg;                         // And show
   const char *names[] = {"down", "up", "req", "ready"};  // network stats
-  MG_INFO(("Ethernet: %s, IP: %M, rx:%u, tx:%u, dr:%u, er:%u",
+  MG_INFO(("Ethernet: %s, IP: %M, rx:%u, tx:%u, dr:%u, er:%u RAM: %lu/%lu",
            names[ifp->state], mg_print_ip4, &ifp->ip, ifp->nrecv, ifp->nsent,
-           ifp->ndrop, ifp->nerr));
-}
-
-void SysTick_Init(void) {
-  SysTick->CMP = SystemCoreClock / 1000 - 1;
-  SysTick->CNT = 0;
-  SysTick->SR = 0;
-  SysTick->CTLR = BIT(0) | BIT(1) | BIT(2) | BIT(3);
-  NVIC_EnableIRQ(SysTicK_IRQn);
+           ifp->ndrop, ifp->nerr, hal_ram_used(), hal_ram_free()));
 }
 
 // https://mongoose.ws/documentation/#2-minute-integration-guide
 static void fn(struct mg_connection *c, int ev, void *ev_data) {
   if (ev == MG_EV_HTTP_MSG) {
     struct mg_http_message *hm = (struct mg_http_message *) ev_data;
-    mg_http_reply(c, 200, "", "ok %p %p\r\n", hm, fn_data);
+    mg_http_reply(c, 200, "", "ok %p\r\n", hm);
   }
 }
 
 int main(void) {
-  SystemCoreClockUpdate();
-  SysTick_Init();
+  struct mg_mgr mgr;
 
-  gpio_output(LED_PIN);           // Setup LED
-  uart_init(UART_DEBUG, 115200);  // Initialise debug printf
-
-  struct mg_mgr mgr;        // Initialise
-  mg_mgr_init(&mgr);        // Mongoose event manager
-  mg_log_set(MG_LL_DEBUG);  // Set log level
+  hal_init();
+  mg_mgr_init(&mgr);
+  mg_log_set(MG_LL_DEBUG);
 
   MG_INFO(("Starting, CPU freq %g MHz", (double) SystemCoreClock / 1000000));
-  extern char _end[], _heap_end[];
-  MG_INFO(("Heap size: %lu bytes", _heap_end - _end));
 
   // Print chip RAM/Flash configuration, and set to 64/256
   const char *sizes[] = {"128/192", "96/224", "64/256", "32/288"};
@@ -87,8 +51,11 @@ int main(void) {
   MG_INFO(("RAM/FLASH configuration: %s", sizes[mode]));
   // if (mode != 2) set_ram_size(2);
 
+  extern char _end[], _heap_end[];
+  MG_INFO(("Heap size: %lu bytes. RAM: used %lu, free %lu", _heap_end - _end,
+           hal_ram_used(), hal_ram_free()));
+
   // Initialise Mongoose network stack
-  ethernet_init();  // Initialise ethernet pins
   struct mg_tcpip_driver_stm32f_data driver_data = {.mdc_cr = 1, .phy_addr = 1};
   struct mg_tcpip_if mif = {.mac = GENERATE_LOCALLY_ADMINISTERED_MAC(),
                             // Uncomment below for static configuration:
@@ -116,26 +83,3 @@ int main(void) {
 
   return 0;
 }
-
-// Newlib syscalls
-int _write(int fd, char *buf, int len) {
-  if (fd == 1) uart_write_buf(USART1, buf, len);
-  return len;
-}
-
-void *_sbrk(ptrdiff_t incr) {
-  extern char _end[], _heap_end[];
-  static char *curbrk = _end;
-  if ((curbrk + incr < _end) || (curbrk + incr > _heap_end)) {
-    return NULL - 1;
-  }
-  // MG_INFO(("%p %ld", curbrk, incr));
-  curbrk += incr;
-  return curbrk - incr;
-}
-
-void _init(void) {
-}
-
-void _fini(void) {
-}