Add nucleo-h743zi-baremetal boilerplate, with HW test

.github/workflows/test.yml

@@ -92,6 +92,8 @@ jobs:
           - path: esp32/device-dashboard
           - path: esp32/uart-bridge
           - path: esp8266/http-client-server
+          - path: stm32/nucleo-h743zi-baremetal
+            target: test
           - path: stm32/stm32-freertos-tcp
           - path: stm32/stm32-nucleo-f746z
           - path: stm32/stm32-nucleo-f746zg

examples/stm32/nucleo-h743zi-baremetal/Makefile

@@ -0,0 +1,38 @@
+CFLAGS  ?=  -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion \
+						-Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion \
+						-g3 -Os -ffunction-sections -fdata-sections \
+            -I. -Ih7/Include -Icmsis/CMSIS/Core/Include \
+            -mcpu=cortex-m7 -mthumb -mfloat-abi=soft \
+            $(EXTRA_CFLAGS)
+LDFLAGS ?= -Tlink.ld -nostartfiles -nostdlib --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+SOURCES = startup.c main.c syscalls.c
+
+# Add Mongoose-specific flags and source files
+CFLAGS  += -I../../.. -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1 -DMG_ENABLE_MIP=1 #-DMG_ENABLE_PACKED_FS=1
+SOURCES += ../../../mongoose.c #../../device-dashboard/net.c ../../device-dashboard/packed_fs.c
+
+all build example: firmware.bin
+
+firmware.bin: firmware.elf
+	arm-none-eabi-objcopy -O binary $< $@
+
+firmware.elf: $(SOURCES) mcu.h
+	arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
+
+# Note: on "unknown chip id" flash error, wire BOOT0 to VDD and st-flash erase
+flash: firmware.bin
+	st-flash --freq 600 --reset write $< 0x8000000
+
+# Requires env variable VCON_API_KEY set
+DEVICE_URL ?= https://dash.vcon.io/api/v3/devices/6
+test: update
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=5 | tee /tmp/output.txt
+	grep 'ticks:' /tmp/output.txt
+#	grep 'Ethernet: up' /tmp/output.txt
+#	grep 'MQTT connected' /tmp/output.txt
+
+update: firmware.bin
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
+
+clean:
+	@rm -rf firmware.* *.su

examples/stm32/nucleo-h743zi-baremetal/link.ld

@@ -0,0 +1,29 @@
+ENTRY(_reset);
+MEMORY {
+  flash(rx) : ORIGIN = 0x08000000, LENGTH = 2048k
+  sram(rwx) : ORIGIN = 0x20000000, LENGTH = 64k
+}
+_estack     = ORIGIN(sram) + LENGTH(sram);    /* stack points to end of SRAM */
+
+SECTIONS {
+  .vectors  : { KEEP(*(.vectors)) }   > flash
+  .text     : { *(.text*) }           > flash
+  .rodata   : { *(.rodata*) }         > flash
+
+  .data : {
+    _sdata = .;   /* for init_ram() */
+    *(.first_data)
+    *(.data SORT(.data.*))
+    _edata = .;  /* for init_ram() */
+  } > sram AT > flash
+  _sidata = LOADADDR(.data);
+
+  .bss : {
+    _sbss = .;              /* for init_ram() */
+    *(.bss SORT(.bss.*) COMMON)
+    _ebss = .;              /* for init_ram() */
+  } > sram
+
+  . = ALIGN(8);
+  _end = .;     /* for cmsis_gcc.h and init_ram() */
+}

examples/stm32/nucleo-h743zi-baremetal/main.c

@@ -0,0 +1,40 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+
+#include "mcu.h"
+#include "mongoose.h"
+
+#define LED1 PIN('B', 0)      // On-board LED pin (green)
+#define LED2 PIN('E', 1)      // On-board LED pin (yellow)
+#define LED3 PIN('B', 14)     // On-board LED pin (red)
+#define BLINK_PERIOD_MS 1000  // LED blinking period in millis
+
+static uint64_t s_ticks;
+void SysTick_Handler(void) { s_ticks++; }
+uint64_t mg_millis(void) { return s_ticks; }
+
+static void timer_cb(void *arg) {
+  gpio_toggle(LED2);                      // Blink LED
+  MG_INFO(("ticks: %lld", mg_millis()));  // Log something
+  (void) arg;
+}
+
+int main(void) {
+  clock_init();
+  systick_init(SYS_FREQUENCY / 1000);  // Increment s_ticks every ms
+  gpio_output(LED2);                   // Setup LED
+  uart_init(UART_DEBUG, 115200);            // Initialise debug printf
+
+  MG_INFO(("Initialising Mongoose..."));
+  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
+  mg_timer_add(&mgr, BLINK_PERIOD_MS, MG_TIMER_REPEAT, timer_cb, NULL);
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  return 0;
+}

examples/stm32/nucleo-h743zi-baremetal/mcu.h

@@ -0,0 +1,146 @@
+// Copyright (c) 2022-2023 Cesanta Software Limited
+// All rights reserved
+//
+// Datasheet: RM0433, devboard manual: UM2407
+// https://www.st.com/resource/en/reference_manual/rm0433-stm32h742-stm32h743753-and-stm32h750-value-line-advanced-armbased-32bit-mcus-stmicroelectronics.pdf
+// Alternate functions: https://www.st.com/resource/en/datasheet/stm32h743vi.pdf
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#define BIT(x) (1UL << (x))
+#define SETBITS(R, CLEARMASK, SETMASK) (R) = ((R) & ~(CLEARMASK)) | (SETMASK)
+#define PIN(bank, num) ((((bank) - 'A') << 8) | (num))
+#define PINNO(pin) (pin & 255)
+#define PINBANK(pin) (pin >> 8)
+
+// TODO: Set clock. Now, running @ default of 64 MHz
+enum { PLL_HSI = 64, PLL_M = 1, PLL_N = 1, PLL_P = 1 };
+#define FLASH_LATENCY 7
+#define SYS_FREQUENCY ((PLL_HSI * PLL_N / PLL_M / PLL_P) * 1000000)
+#define APB2_FREQUENCY SYS_FREQUENCY
+#define APB1_FREQUENCY SYS_FREQUENCY
+
+struct systick {
+  volatile uint32_t CTRL, LOAD, VAL, CALIB;
+};
+#define SYSTICK ((struct systick *) 0xe000e010)
+static inline void systick_init(uint32_t ticks) {
+  if ((ticks - 1) > 0xffffff) return;  // Systick timer is 24 bit
+  SYSTICK->LOAD = ticks - 1;
+  SYSTICK->VAL = 0;
+  SYSTICK->CTRL = BIT(0) | BIT(1) | BIT(2);  // Enable systick
+}
+
+struct rcc {
+  volatile uint32_t CR, HSICFGR, CRRCR, CSICFGR, CFGR, RESERVED1, D1CFGR,
+      D2CFGR, D3CFGR, RESERVED2, PLLCKSELR, PLLCFGR, PLL1DIVR, PLL1FRACR,
+      PLL2DIVR, PLL2FRACR, PLL3DIVR, PLL3FRACR, RESERVED3, D1CCIPR, D2CCIP1R,
+      D2CCIP2R, D3CCIPR, RESERVED4, CIER, CIFR, CICR, RESERVED5, BDCR, CSR,
+      RESERVED6, AHB3RSTR, AHB1RSTR, AHB2RSTR, AHB4RSTR, APB3RSTR, APB1LRSTR,
+      APB1HRSTR, APB2RSTR, APB4RSTR, GCR, RESERVED8, D3AMR, RESERVED11[9], RSR,
+      AHB3ENR, AHB1ENR, AHB2ENR, AHB4ENR, APB3ENR, APB1LENR, APB1HENR, APB2ENR,
+      APB4ENR, RESERVED12, AHB3LPENR, AHB1LPENR, AHB2LPENR, AHB4LPENR,
+      APB3LPENR, APB1LLPENR, APB1HLPENR, APB2LPENR, APB4LPENR, RESERVED13[4];
+};
+#define RCC ((struct rcc *) (0x40000000 + 0x18020000 + 0x4400))
+
+static inline void spin(volatile uint32_t n) {
+  while (n--) (void) 0;
+}
+
+enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
+enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
+enum { GPIO_SPEED_LOW, GPIO_SPEED_MEDIUM, GPIO_SPEED_HIGH, GPIO_SPEED_INSANE };
+enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
+
+struct gpio {
+  volatile uint32_t MODER, OTYPER, OSPEEDR, PUPDR, IDR, ODR, BSRR, LCKR, AFR[2];
+};
+#define GPIO(N) ((struct gpio *) (0x40000000 + 0x18020000UL + 0x400 * (N)))
+
+static struct gpio *gpio_bank(uint16_t pin) { return GPIO(PINBANK(pin)); }
+static inline void gpio_toggle(uint16_t pin) {
+  struct gpio *gpio = gpio_bank(pin);
+  uint32_t mask = BIT(PINNO(pin));
+  gpio->BSRR = mask << (gpio->ODR & mask ? 16 : 0);
+}
+static inline int gpio_read(uint16_t pin) {
+  return gpio_bank(pin)->IDR & BIT(PINNO(pin)) ? 1 : 0;
+}
+static inline void gpio_write(uint16_t pin, bool val) {
+  struct gpio *gpio = gpio_bank(pin);
+  gpio->BSRR = BIT(PINNO(pin)) << (val ? 0 : 16);
+}
+static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t type,
+                             uint8_t speed, uint8_t pull, uint8_t af) {
+  struct gpio *gpio = gpio_bank(pin);
+  uint8_t n = (uint8_t) (PINNO(pin));
+  RCC->AHB4ENR |= BIT(PINBANK(pin));  // Enable GPIO clock
+  SETBITS(gpio->OTYPER, 1UL << n, ((uint32_t) type) << n);
+  SETBITS(gpio->OSPEEDR, 3UL << (n * 2), ((uint32_t) speed) << (n * 2));
+  SETBITS(gpio->PUPDR, 3UL << (n * 2), ((uint32_t) pull) << (n * 2));
+  SETBITS(gpio->AFR[n >> 3], 15UL << ((n & 7) * 4),
+          ((uint32_t) af) << ((n & 7) * 4));
+  SETBITS(gpio->MODER, 3UL << (n * 2), ((uint32_t) mode) << (n * 2));
+}
+static inline void gpio_input(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_INPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
+            GPIO_PULL_NONE, 0);
+}
+static inline void gpio_output(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
+            GPIO_PULL_NONE, 0);
+}
+
+struct uart {
+  volatile uint32_t CR1, CR2, CR3, BRR, GTPR, RTOR, RQR, ISR, ICR, RDR, TDR,
+      PRESC;
+};
+#define UART1 ((struct uart *) 0x40011000)
+#define UART2 ((struct uart *) 0x40004400)
+#define UART3 ((struct uart *) 0x40004800)
+#define UART_DEBUG UART1
+
+static inline void uart_init(struct uart *uart, unsigned long baud) {
+  uint8_t af = 7;           // Alternate function
+  uint16_t rx = 0, tx = 0;  // pins
+  uint32_t freq = 0;        // Bus frequency. UART1 is on APB2, rest on APB1
+
+  if (uart == UART1) freq = APB2_FREQUENCY, RCC->APB2ENR |= BIT(4);
+  if (uart == UART2) freq = APB1_FREQUENCY, RCC->APB1LENR |= BIT(17);
+  if (uart == UART3) freq = APB1_FREQUENCY, RCC->APB1LENR |= BIT(18);
+
+  if (uart == UART1) tx = PIN('A', 9), rx = PIN('A', 10);
+  if (uart == UART2) tx = PIN('A', 2), rx = PIN('A', 3);
+  if (uart == UART3) tx = PIN('D', 8), rx = PIN('D', 9);
+
+  freq = SYS_FREQUENCY;
+
+  gpio_init(tx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, 0, af);
+  gpio_init(rx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, 0, af);
+  uart->CR1 = 0;                         // Disable this UART
+  uart->BRR = freq / baud;               // Set baud rate
+  uart->CR1 = BIT(0) | BIT(2) | BIT(3);  // Set UE, RE, TE
+}
+static inline void uart_write_byte(struct uart *uart, uint8_t byte) {
+  uart->TDR = byte;
+  while ((uart->ISR & BIT(7)) == 0) spin(1);
+}
+static inline void uart_write_buf(struct uart *uart, char *buf, size_t len) {
+  while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
+}
+static inline int uart_read_ready(struct uart *uart) {
+  return uart->ISR & BIT(5);  // If RXNE bit is set, data is ready
+}
+static inline uint8_t uart_read_byte(struct uart *uart) {
+  return (uint8_t) (uart->RDR & 255);
+}
+
+static inline void clock_init(void) {
+  // TODO: Enable FPU, set flash latency, set clock
+}

examples/stm32/nucleo-h743zi-baremetal/startup.c

@@ -0,0 +1,42 @@
+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+
+// Startup code
+__attribute__((naked, noreturn)) void _reset(void) {
+  // Initialise memory
+  extern long _sbss, _ebss, _sdata, _edata, _sidata;
+  for (long *src = &_sbss; src < &_ebss; src++) *src = 0;
+  for (long *src = &_sdata, *dst = &_sidata; src < &_edata;) *src++ = *dst++;
+
+  // Call main()
+  extern void main(void);
+  main();
+  for (;;) (void) 0;
+}
+
+void __attribute__((weak)) DefaultIRQHandler(void) {
+  for (;;) (void) 0;
+}
+
+#define WEAK_ALIAS __attribute__((weak, alias("DefaultIRQHandler")))
+
+WEAK_ALIAS void NMI_Handler(void);
+WEAK_ALIAS void HardFault_Handler(void);
+WEAK_ALIAS void MemManage_Handler(void);
+WEAK_ALIAS void BusFault_Handler(void);
+WEAK_ALIAS void UsageFault_Handler(void);
+WEAK_ALIAS void SVC_Handler(void);
+WEAK_ALIAS void DebugMon_Handler(void);
+WEAK_ALIAS void PendSV_Handler(void);
+WEAK_ALIAS void SysTick_Handler(void);
+
+// IRQ table
+extern void _estack();
+__attribute__((section(".vectors"))) void (*tab[16 + 150])(void) = {
+    // Cortex interrupts
+    _estack, _reset, NMI_Handler, HardFault_Handler, MemManage_Handler,
+    BusFault_Handler, UsageFault_Handler, 0, 0, 0, 0, SVC_Handler,
+    DebugMon_Handler, 0, PendSV_Handler, SysTick_Handler,
+
+    // Interrupts from peripherals
+    DefaultIRQHandler};

examples/stm32/nucleo-h743zi-baremetal/syscalls.c

@@ -0,0 +1,79 @@
+#include <sys/stat.h>
+
+#include "mcu.h"
+
+int _fstat(int fd, struct stat *st) {
+  if (fd < 0) return -1;
+  st->st_mode = S_IFCHR;
+  return 0;
+}
+
+void *_sbrk(int incr) {
+  extern char _end;
+  static unsigned char *heap = NULL;
+  unsigned char *prev_heap;
+  if (heap == NULL) heap = (unsigned char *) &_end;
+  prev_heap = heap;
+  heap += 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 (;;) asm volatile("BKPT #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;
+}