Add ek-ra6m4 example

examples/renesas/ek-ra6m4-make-baremetal-builtin/Makefile

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+CFLAGS  = -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion
+CFLAGS += -Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion
+CFLAGS += -g3 -Os -ffunction-sections -fdata-sections
+CFLAGS += -I. -Icmsis_core/CMSIS/Core/Include
+CFLAGS += -Icmsis_mcu/ra/fsp/src/bsp/cmsis/Device/RENESAS/Include
+CFLAGS += -Icmsis_mcu/ra/fsp/src/bsp/mcu/all
+#CFLAGS += -Icmsis_mcu/ra/fsp/inc
+#CFLAGS += -Icmsis_mcu/ra/fsp/inc/api
+CFLAGS += -mcpu=cortex-m33 -mthumb -mfpu=fpv5-sp-d16 -mfloat-abi=hard $(CFLAGS_EXTRA)
+LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+
+SOURCES = main.c hal.c mongoose.c net.c packed_fs.c
+#SOURCES += cmsis_mcu/Files/startup_RA.c
+#SOURCES += cmsis_mcu/Files/system_RA.c
+
+# Example specific build options. See README.md
+CFLAGS += -DHTTP_URL=\"http://0.0.0.0/\" -DHTTPS_URL=\"https://0.0.0.0/\"
+
+ifeq ($(OS),Windows_NT)
+  RM = cmd /C del /Q /F /S
+else
+  RM = rm -rf
+endif
+
+all build example: firmware.bin
+
+firmware.bin: firmware.elf
+	arm-none-eabi-objcopy -O binary $< $@
+
+firmware.elf: cmsis_core cmsis_mcu $(SOURCES) hal.h link.ld Makefile
+	arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
+	arm-none-eabi-size $@
+
+flash: firmware.bin
+	rfp-cli -d ra -t jlink -v -p -bin 0x0000000 $<
+	rfp-cli -d ra -t jlink -rv 0x8000000 256
+
+cmsis_core:     # ARM CMSIS core headers
+	git clone -q --depth 1 -b 5.9.0 https://github.com/ARM-software/CMSIS_5 $@
+cmsis_mcu:
+	git clone -q --depth 1 -b v5.1.0 https://github.com/renesas/fsp $@
+
+
+# Automated remote test. Requires env variable VCON_API_KEY set. See https://vcon.io/automated-firmware-tests/
+DEVICE_URL ?= https://dash.vcon.io/api/v3/devices/13
+update: firmware.bin
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
+
+update: CFLAGS += -DUART_DEBUG=LPUART3
+
+test: update
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=5 | tee /tmp/output.txt
+	grep 'READY, IP:' /tmp/output.txt       # Check for network init
+
+clean:
+	$(RM) firmware.* *.su cmsis_core cmsis_mcu mbedtls *.zip

examples/renesas/ek-ra6m4-make-baremetal-builtin/hal.c

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+// Copyright (c) 2024 Cesanta Software Limited
+// All rights reserved
+
+#include <stdint.h>
+#include <string.h>
+#include <sys/stat.h>  // For _fstat()
+
+#include "hal.h"
+
+uint32_t SystemCoreClock = SYS_FREQUENCY;
+static volatile uint64_t s_ticks;  // Milliseconds since boot
+
+extern void _estack(void);  // Defined in link.ld
+void Reset_Handler(void);
+void SysTick_Handler(void);
+
+// 16 ARM and 200 peripheral handlers
+__attribute__((section(".vectors"))) void (*const tab[16 + 10])(void) = {
+    _estack, Reset_Handler,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0,       SysTick_Handler};
+
+void Reset_Handler(void) {
+  extern long _sbss[], _ebss[], _sdata[], _edata[], _sidata[];
+  extern int main(void);
+
+  SCB->VTOR = (uint32_t) tab;
+  for (long *dst = _sbss; dst < _ebss; dst++) *dst = 0;
+  for (long *dst = _sdata, *src = _sidata; dst < _edata;) *dst++ = *src++;
+
+  SystemInit();
+  main();
+  while (1) (void) 0;
+}
+
+void SystemInit(void) {  // Called automatically by startup code
+  clock_init();          // Set system clock to SYS_FREQUENCY
+  rng_init();            // Initialise random number generator
+  SysTick_Config(SystemCoreClock / 1000);  // Sys tick every 1ms
+}
+
+void SysTick_Handler(void) {  // SyStick IRQ handler, triggered every 1ms
+  s_ticks++;
+}
+
+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) {
+  uart_init(UART_DEBUG, 115200);  // Initialise UART
+  gpio_output(LED1);              // Initialise LED
+  gpio_output(LED2);              // Initialise LED
+  gpio_output(LED3);              // Initialise LED
+  ethernet_init();                // Initialise Ethernet pins
+}
+
+// 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 (;;) 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;
+}
+
+void _init(void) {
+}

examples/renesas/ek-ra6m4-make-baremetal-builtin/hal.h

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+// Copyright (c) 2024 Cesanta Software Limited
+// All rights reserved
+//
+// MCU and ek-ra6m4 eval board datasheets:
+// https://www.renesas.com/us/en/document/man/ra6m4-group-user-s-manual-hardware
+// https://www.renesas.com/us/en/document/man/ek-ra6m5-v1-users-manual
+
+#pragma once
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include "bsp_exceptions.h"
+
+#include "R7FA6M4AF.h"
+
+extern void hal_init(void);
+
+#define LED1 PIN('E', 15)
+#define LED2 PIN('E', 4)
+#define LED3 PIN('E', 0)
+#define UART_DEBUG R_SCI0
+#define UART_TX PIN('G', 13)
+#define UART_RX PIN('G', 12)
+
+#define BIT(x) (1UL << (x))
+#define CLRSET(reg, clear, set) ((reg) = ((reg) & ~(clear)) | (set))
+#define PIN(port, num) ((((port) - 'A') << 8) | (num))
+#define PIN_NUM(pin) (pin & 255)
+#define PIN_PORT(pin) (pin >> 8)
+
+// No-op HAL API implementation for a device with GPIO and UART
+#define rng_read() 0
+#define rng_init()
+#define uart_read_ready(uart) 0
+#define GENERATE_MAC_ADDRESS() \
+  { 2, 3, 4, 5, 6, 7 }
+
+// Clock
+#define SYS_FREQUENCY 2000000
+static inline void clock_init(void) {
+  SCB->CPACR = (uint32_t) 15U << 20;
+}
+
+// GPIO
+#define GPIO(N) ((R_PORT0_Type *) (R_PORT0_BASE + 0x20 * (N)))
+enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF };
+
+static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t af) {
+  R_PORT0_Type *gpio = GPIO(PIN_PORT(pin));
+  if (mode == GPIO_MODE_OUTPUT) {
+    gpio->PCNTR1 |= BIT(PIN_NUM(pin));
+  } else if (mode == GPIO_MODE_INPUT) {
+    gpio->PCNTR1 &= ~BIT(PIN_NUM(pin));
+  } else {
+    (void) af;
+  }
+}
+
+static inline void gpio_output(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_OUTPUT, 0);
+}
+
+static inline void gpio_input(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_INPUT, 0);
+}
+
+static inline bool gpio_read(uint16_t pin) {
+  R_PORT0_Type *gpio = GPIO(PIN_PORT(pin));
+  return gpio->PCNTR2 & BIT(PIN_NUM(pin)) ? true : false;
+}
+
+static inline void gpio_write(uint16_t pin, bool val) {
+  R_PORT0_Type *gpio = GPIO(PIN_PORT(pin));
+  gpio->PCNTR3 = BIT(PIN_NUM(pin)) << (val ? 0 : 16U);
+}
+
+static inline void gpio_toggle(uint16_t pin) {
+  gpio_write(pin, !gpio_read(pin));
+}
+
+// UART
+static inline void uart_init(R_SCI0_Type *uart, unsigned baud) {
+  gpio_output(UART_TX);
+  gpio_input(UART_RX);
+  (void) uart, (void) baud;
+}
+
+static inline void uart_write_byte(void *uart, uint8_t byte) {
+  uint16_t pin = UART_TX;
+  uint32_t baud = 9600;
+  uint32_t interval = SYS_FREQUENCY / baud;  // Time to send 1 bit
+  uint8_t bits[] = {
+      0,  // Start bit
+      (byte >> 0) & 1U,
+      (byte >> 1) & 1U,
+      (byte >> 2) & 1U,
+      (byte >> 3) & 1U,
+      (byte >> 4) & 1U,
+      (byte >> 5) & 1U,
+      (byte >> 6) & 1U,
+      (byte >> 7) & 1U,
+      1,  // Stop bit
+  };
+  uint32_t t = SysTick->VAL;  // Current timer value
+
+  for (uint8_t i = 0; i < 10; i++) {
+    gpio_write(pin, bits[i]);
+    if (t <= interval) {
+      while (SysTick->VAL <= t) (void) 0;
+      t = SysTick->LOAD + 1 - interval;
+      while (SysTick->VAL > t) (void) 0;
+    } else {
+      t -= interval;
+      while (SysTick->VAL > t) (void) 0;
+    }
+  }
+  (void) uart;
+}
+
+static inline void uart_write_buf(void *uart, char *buf, size_t len) {
+  while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
+}
+
+// Ethernet
+static inline void ethernet_init(void) {
+}

examples/renesas/ek-ra6m4-make-baremetal-builtin/link.ld

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+ENTRY(Reset_Handler);
+MEMORY {
+  flash(rx) : ORIGIN = 0x00000000, LENGTH = 1024k
+  sram(rwx) : ORIGIN = 0x20000000, LENGTH = 256k 
+}
+_estack = ORIGIN(sram) + LENGTH(sram);    /* End of RAM. stack points here */
+
+SECTIONS {
+  .vectors  : { KEEP(*(.isr_vector)) }  > flash
+  .text     : { *(.text* .text.*) }     > flash
+  .rodata   : { *(.rodata*) }           > flash
+
+  .data : {
+    _sdata = .;
+    *(.first_data)
+    *(.ram)
+    *(.data SORT(.data.*))
+    _edata = .;
+  } > sram AT > flash
+  _sidata = LOADADDR(.data);
+
+  .bss : {
+    _sbss = .;
+    *(.bss SORT(.bss.*) COMMON)
+    _ebss = .;
+  } > sram
+
+  . = ALIGN(8);
+  _end = .;
+}