Add example for ch32v307

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

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+CFLAGS = -W -Wall -Wextra -Wno-error -Wundef -Wshadow -Wdouble-promotion
+CFLAGS += -Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion
+CFLAGS += -ffunction-sections -fdata-sections #-fmessage-length=0 -fsigned-char
+CFLAGS += -march=rv32imafc -mabi=ilp32f #-msmall-data-limit=8 -mno-save-restore
+CFLAGS += -DSYSCLK_FREQ_144MHz_HSE -I. -Ivendor -g3 -Os $(CFLAGS_EXTRA)
+
+LDFLAGS = -T vendor/link.ld -nostartfiles --specs=nano.specs #--specs=nosys.specs
+LDFLAGS += -lc -lgcc -Wl,--gc-sections #-Wl,-Map=$@.map
+
+SOURCES = main.c mongoose.c vendor/system_ch32v30x.c vendor/startup_ch32v30x_D8C.S
+
+ifeq ($(OS),Windows_NT)
+  RM = cmd /C del /Q /F /S
+else
+  RM = rm -rf
+endif
+
+all: firmware.bin
+
+firmware.bin: firmware.elf
+	riscv64-unknown-elf-objcopy -O binary $< $@
+	ls -l firmware.*
+
+firmware.elf: $(SOURCES) hal.h Makefile
+	riscv64-unknown-elf-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
+
+flash: firmware.bin
+	wchisp flash $<
+
+clean:
+	$(RM) firmware.* *.su

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

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+// Copyright (c) 2023 Cesanta Software Limited
+// All rights reserved
+
+#pragma once
+
+#include <ch32v30x.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define BIT(x) (1UL << (x))
+#define CLRSET(reg, clear, set) ((reg) = ((reg) & ~(clear)) | (set))
+#define PIN(bank, num) ((((bank) - 'A') << 8) | (num))
+#define PINNO(pin) (pin & 255)
+#define PINBANK(pin) (pin >> 8)
+
+extern uint32_t SystemCoreClock;
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+
+static inline void spin(volatile uint32_t count) {
+  while (count--) (void) 0;
+}
+
+enum {
+  GPIO_MODE_INPUT,
+  GPIO_MODE_OUTPUT_10M,
+  GPIO_MODE_OUTPUT_2M,
+  GPIO_MODE_OUTPUT_50M
+};
+enum { GPIO_OTYPE_PP, GPIO_OTYPE_OD, GPIO_OTYPE_AF_PP, GPIO_AF_OD };
+enum { GPIO_ITYPE_ANALOG, GPIO_ITYPE_FLOAT, GPIO_ITYPE_PUPD };
+#define GPIO(N) ((GPIO_TypeDef *) (GPIOA_BASE + 0x400 * (N)))
+
+static GPIO_TypeDef *gpio_bank(uint16_t pin) {
+  return GPIO(PINBANK(pin));
+}
+static inline void gpio_toggle(uint16_t pin) {
+  GPIO_TypeDef *gpio = gpio_bank(pin);
+  uint32_t mask = BIT(PINNO(pin));
+  gpio->BSHR = mask << (gpio->OUTDR & mask ? 16 : 0);
+}
+static inline bool gpio_read(uint16_t pin) {
+  return gpio_bank(pin)->INDR & BIT(PINNO(pin)) ? true : false;
+}
+static inline void gpio_write(uint16_t pin, bool val) {
+  GPIO_TypeDef *gpio = gpio_bank(pin);
+  gpio->BSHR = BIT(PINNO(pin)) << (val ? 0 : 16);
+}
+static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t cfg) {
+  GPIO_TypeDef *gpio = gpio_bank(pin);
+  uint8_t bank = (uint8_t) PINBANK(pin), no = (uint8_t) PINNO(pin);
+  RCC->APB2PCENR |= BIT(bank + 2);  // Enable GPIO clock, section 3.4.7
+  if (mode != GPIO_MODE_INPUT && cfg == GPIO_OTYPE_AF_PP) {
+    RCC->APB2PCENR |= BIT(0);  // Enable AFIO
+  }
+  volatile uint32_t *r = &gpio->CFGLR;
+  if (no > 7) r = &gpio->CFGHR, no -= 8;
+  uint8_t v = (mode & 3U) | ((cfg & 3U) << 2);
+  CLRSET(*r, 15U << (no * 4), v << (no * 4));
+}
+static inline void gpio_input(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_INPUT, GPIO_ITYPE_PUPD);
+}
+static inline void gpio_output(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_OUTPUT_50M, GPIO_OTYPE_PP);
+}
+
+static inline void uart_init(USART_TypeDef *uart, unsigned baud) {
+  uint16_t rx = 0, tx = 0;  // pins
+  uint32_t freq = 0;        // Bus frequency. UART1 is on APB2, rest on APB1
+
+  if (uart == USART1) freq = SystemCoreClock, RCC->APB2PCENR |= BIT(14);
+  if (uart == USART2) freq = SystemCoreClock, RCC->APB1PCENR |= BIT(17);
+  if (uart == USART3) freq = SystemCoreClock, RCC->APB1PCENR |= BIT(18);
+
+  if (uart == USART1) tx = PIN('A', 9), rx = PIN('A', 10);
+  // if (uart == USART1) tx = PIN('B', 6), rx = PIN('B', 7);
+  if (uart == USART2) tx = PIN('A', 2), rx = PIN('A', 3);
+  if (uart == USART3) tx = PIN('B', 10), rx = PIN('B', 11);
+
+  gpio_init(tx, GPIO_MODE_OUTPUT_50M, GPIO_OTYPE_AF_PP);
+  gpio_init(rx, GPIO_MODE_INPUT, GPIO_ITYPE_PUPD);
+  uart->CTLR1 = 0;                        // Disable this UART
+  unsigned div = freq / baud * 100 / 16;  // 18.3
+  uart->BRR = (uint16_t) (((div / 100) << 4) | (div * 16 / 100));
+  uart->CTLR1 = BIT(13) | BIT(2) | BIT(3);  // Set UE, RE, TE
+}
+static inline void uart_write_byte(USART_TypeDef *uart, uint8_t byte) {
+  uart->DATAR = byte;
+  volatile int timeout = 999;
+  while ((uart->STATR & BIT(7)) == 0 && timeout--) spin(1);
+}
+static inline void uart_write_buf(USART_TypeDef *uart, char *buf, size_t len) {
+  while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
+}
+static inline int uart_read_ready(USART_TypeDef *uart) {
+  return uart->STATR & BIT(5);  // If RXNE bit is set, data is ready
+}
+static inline uint8_t uart_read_byte(USART_TypeDef *uart) {
+  return (uint8_t) (uart->DATAR & 255U);
+}
+
+static inline void ethernet_init(void) {
+  // Set 60MHz ethernet clock
+  RCC->CTLR &= ~BIT(28);                     // PLL3 off
+  CLRSET(RCC->CFGR2, 15U << 4, 1U << 4);     // 3.4.12: PREDIV2 = 2
+  CLRSET(RCC->CFGR2, 15U << 12, 13U << 12);  // 3.4.12: PLL3MUL = 15
+  RCC->CTLR |= BIT(28);                      // PLL3 on
+
+  EXTEN->EXTEN_CTR |= EXTEN_ETH_10M_EN;  // Enable built-in 10M PHY
+#if 0
+  // RMII mode
+  // 27.1.3 : init pins
+  uint16_t pins[] = {PIN('A', 1),  PIN('A', 2),  PIN('A', 7),
+                     PIN('B', 11), PIN('B', 12), PIN('B', 13),
+                     PIN('C', 1),  PIN('C', 4),  PIN('C', 5)};
+  for (size_t i = 0; i < sizeof(pins) / sizeof(pins[0]); i++) {
+    gpio_init(pins[i], GPIO_MODE_OUTPUT_50M, GPIO_OTYPE_AF_PP);
+  }
+  AFIO->PCFR1 |= BIT(23);                        // Use RMII
+#endif
+  RCC->AHBPCENR |= BIT(14) | BIT(15) | BIT(16);  // Enable MAC, TX, RX
+  NVIC_EnableIRQ(ETH_IRQn);
+  // NVIC_SetPriority(ETH_IRQn, 0);
+}
+
+static inline void rng_init(void) {
+  RNG->CR |= RNG_CR_RNGEN;
+}
+static inline uint32_t rng_read(void) {
+  return RNG->DR;
+}
+
+// Helper macro for MAC generation
+#define ROM_MAC ((uint8_t *) (0X1ffff7e8 + 5))
+#define GENERATE_LOCALLY_ADMINISTERED_MAC() \
+  { 2, ROM_MAC[0], ROM_MAC[1], ROM_MAC[2], ROM_MAC[3], ROM_MAC[4] }

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

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+// Copyright (c) 2023 Cesanta Software Limited
+
+#include "hal.h"
+#include "mongoose.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 UART_DEBUG USART1
+
+#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));
+  }
+}
+
+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",
+           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);
+}
+
+static void mg_putchar(char ch, void *param) {
+  uart_write_byte(param, ch);
+}
+
+// https://mongoose.ws/documentation/#2-minute-integration-guide
+static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    // The MG_EV_HTTP_MSG event means HTTP request. `hm` holds parsed request,
+    // see https://mongoose.ws/documentation/#struct-mg_http_message
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+
+    // If the requested URI is "/api/hi", send a simple JSON response back
+    if (mg_http_match_uri(hm, "/api/hi")) {
+      // Use mg_http_reply() API function to generate JSON response. It adds a
+      // Content-Length header automatically. In the response, we show
+      // the requested URI and HTTP body:
+      mg_http_reply(c, 200, "", "{%m:%m,%m:%m}\n",  // See mg_snprintf doc
+                    MG_ESC("uri"), mg_print_esc, hm->uri.len, hm->uri.ptr,
+                    MG_ESC("body"), mg_print_esc, hm->body.len, hm->body.ptr);
+    } else {
+      // For all other URIs, serve static content
+      mg_http_reply(c, 200, "", "hi tick %llu\n", s_ticks); // See mg_snprintf doc
+    }
+  }
+  (void) fn_data;
+}
+
+int main(void) {
+  SystemCoreClockUpdate();
+  SysTick_Init();
+
+  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
+  mg_log_set_fn(mg_putchar, UART_DEBUG);
+
+  ethernet_init();  // Initialise ethernet pins
+  MG_INFO(("Starting, CPU freq %g MHz", (double) SystemCoreClock / 1000000));
+
+  // Initialise Mongoose network stack
+  struct mg_tcpip_driver_stm32_data driver_data = {.mdc_cr = 1};
+  struct mg_tcpip_if mif = {.mac = GENERATE_LOCALLY_ADMINISTERED_MAC(),
+                            // Uncomment below for static configuration:
+                            // .ip = mg_htonl(MG_U32(192, 168, 0, 223)),
+                            // .mask = mg_htonl(MG_U32(255, 255, 255, 0)),
+                            // .gw = mg_htonl(MG_U32(192, 168, 0, 1)),
+                            .driver = &mg_tcpip_driver_stm32,
+                            .driver_data = &driver_data};
+  mg_tcpip_init(&mgr, &mif);
+  mg_timer_add(&mgr, BLINK_PERIOD_MS, MG_TIMER_REPEAT, timer_fn, &mif);
+
+  MG_INFO(("MAC: %M. Waiting for IP...", mg_print_mac, mif.mac));
+  while (mif.state != MG_TCPIP_STATE_READY) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  MG_INFO(("Initialising application..."));
+  mg_http_listen(&mgr, "http://0.0.0.0", fn, NULL);
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  return 0;
+}
+
+// Newlib syscalls overrides. IO retargeting, and malloc
+int _write(int fd, char *ptr, int len) {
+  if (fd == 1 || fd == 2) uart_write_buf(UART_DEBUG, ptr, (size_t) len);
+  return len;
+}
+
+void *_sbrk(ptrdiff_t incr) {
+  extern char _end[];
+  extern char _heap_end[];
+  static char *curbrk = _end;
+  if ((curbrk + incr < _end) || (curbrk + incr > _heap_end)) return NULL - 1;
+  curbrk += incr;
+  return curbrk - incr;
+}

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

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+../../../mongoose.c

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

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+../../../mongoose.h

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

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+#pragma once
+
+// See https://mongoose.ws/documentation/#build-options
+#define MG_ARCH MG_ARCH_NEWLIB
+
+#define MG_ENABLE_TCPIP 1
+#define MG_ENABLE_CUSTOM_MILLIS 1
+#define MG_ENABLE_CUSTOM_RANDOM 1
+//#define MG_ENABLE_PACKED_FS 1
+#define MG_ENABLE_FILE 0
+#define MG_ENABLE_DRIVER_STM32 1
+#define MG_ENABLE_LINES 1