Add rt1020 baremetal sketch

examples/nxp/rt1020-make-baremetal/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 -Icmsis_mcu/devices/MIMXRT1021 #-DCPU_MIMXRT1021DAG5A
+CFLAGS += -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16
+LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
+# cmsis_mcu/devices/MIMXRT1021/gcc/MIMXRT1021xxxxx_ram.ld
+# cmsis_mcu/devices/MIMXRT1021/system_MIMXRT1021.c
+
+SOURCES = main.c syscalls.c sysinit.c
+SOURCES += cmsis_mcu/devices/MIMXRT1021/gcc/startup_MIMXRT1021.S
+
+# Mongoose-specific. See https://mongoose.ws/documentation/#build-options
+SOURCES += mongoose.c
+CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1
+CFLAGS += -DMG_ENABLE_CUSTOM_RANDOM=1 #-DMG_ENABLE_PACKED_FS=1
+CFLAGS += $(CFLAGS_EXTRA)
+
+# Example specific build options. See README.md
+#CFLAGS += -DHTTP_URL=\"http://0.0.0.0/\" -DHTTPS_URL=\"https://0.0.0.0/\"
+
+ifeq ($(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 $@
+
+flash: firmware.bin
+	st-flash --reset write $< 0x8000000
+
+cmsis_core:     # ARM CMSIS core headers
+	git clone -q --depth 1 -b 5.9.0 https://github.com/ARM-software/CMSIS_5 $@
+cmsis_mcu:
+	curl -sL https://mcuxpresso.nxp.com/cmsis_pack/repo/NXP.MIMXRT1021_DFP.17.0.0.pack -o $@.zip
+	mkdir $@ && cd $@ && unzip -q ../$@.zip
+#	https://mcuxpresso.nxp.com/cmsis_pack/repo/NXP.EVK-MIMXRT1020_BSP.17.0.0.pack
+#	https://mcuxpresso.nxp.com/cmsis_pack/repo/NXP.MIMXRT1021_DFP.17.0.0.pack
+mbedtls:        # mbedTLS library
+	git clone --depth 1 -b v2.28.2 https://github.com/mbed-tls/mbedtls $@
+
+ifeq ($(TLS), mbedtls)
+CFLAGS += -DMG_TLS=MG_TLS_MBED -Wno-conversion -Imbedtls/include
+CFLAGS += -DMBEDTLS_CONFIG_FILE=\"mbedtls_config.h\" mbedtls/library/*.c
+firmware.elf: mbedtls
+endif
+
+# 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/4
+update: firmware.bin
+	curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
+
+test update: CFLAGS += -DUART_DEBUG=USART1
+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/nxp/rt1020-make-baremetal/hal.h

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+// Copyright (c) 2023 Cesanta Software Limited
+// All rights reserved
+// https://www.nxp.com/webapp/Download?colCode=IMXRT1020RM
+// https://cache.nxp.com/secured/assets/documents/en/user-guide/MIMXRT1020EVKHUG.pdf
+
+#pragma once
+
+#include "MIMXRT1021.h"
+// #include "drivers/fsl_clock.h"
+
+#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)
+
+#define LED PIN('A', 6)  // Use LED for blinking, GPIO_AD_B0_06. RM tbl 9-1
+
+#ifndef UART_DEBUG
+#define UART_DEBUG LPUART1
+#endif
+
+#define SYS_FREQUENCY 16000000
+
+static inline void spin(volatile uint32_t count) {
+  while (count--) (void) 0;
+}
+
+static inline GPIO_Type *gpio_bank(uint16_t pin) {
+  switch (PINBANK(pin)) {
+    case 1: return (GPIO_Type *) GPIO1_BASE;
+    case 2: return (GPIO_Type *) GPIO2_BASE;
+    case 3: return (GPIO_Type *) GPIO3_BASE;
+    case 5: return (GPIO_Type *) GPIO5_BASE;
+    default: return NULL;
+  }
+}
+
+enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
+// enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
+// enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
+
+#if 0
+static inline void CLOCK_ControlGate(clock_ip_name_t name,
+                                     clock_gate_value_t value) {
+  uint32_t index = ((uint32_t) name) >> 8U;
+  uint32_t shift = ((uint32_t) name) & 0x1FU;
+  volatile uint32_t *reg;
+  assert(index <= 6UL);
+  reg = (volatile uint32_t *) ((uint32_t) ((volatile uint32_t *) &CCM->CCGR0) +
+                               sizeof(volatile uint32_t *) * index);
+  SDK_ATOMIC_LOCAL_CLEAR_AND_SET(reg, (3UL << shift),
+                                 (((uint32_t) value) << shift));
+}
+
+static inline void CLOCK_EnableClock(clock_ip_name_t name) {
+  CLOCK_ControlGate(name, kCLOCK_ClockNeededRunWait);
+}
+#endif
+
+enum { CLOCK_OFF = 0U, CLOCK_ON_RUN = 1U, CLOCK_ON_RUN_WAIT = 3U };
+static inline void clock_periph(uint32_t index, uint32_t shift, uint32_t val) {
+  volatile uint32_t *r = &CCM->CCGR0;
+  SETBITS(r[index], 3UL << shift, val << shift);
+}
+
+static inline void gpio_init(uint16_t pin, uint8_t mode) {
+  GPIO_Type *gpio = gpio_bank(pin);
+  uint32_t mask = (uint32_t) BIT(PINNO(pin));
+
+  // Enable clock
+  switch (PINBANK(pin)) {
+    case 1: clock_periph(1, CCM_CCGR1_CG13_SHIFT, CLOCK_ON_RUN_WAIT); break;
+    case 2: clock_periph(0, CCM_CCGR0_CG15_SHIFT, CLOCK_ON_RUN_WAIT); break;
+    case 3: clock_periph(2, CCM_CCGR2_CG13_SHIFT, CLOCK_ON_RUN_WAIT); break;
+    case 5: clock_periph(1, CCM_CCGR1_CG15_SHIFT, CLOCK_ON_RUN_WAIT); break;
+    default: break;
+  }
+
+  gpio->IMR &= ~mask;
+  if (mode == GPIO_MODE_INPUT) {
+    gpio->GDIR &= ~mask;
+  } else {
+    gpio->GDIR |= mask;
+  }
+}
+static inline void gpio_input(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_INPUT);
+}
+static inline void gpio_output(uint16_t pin) {
+  gpio_init(pin, GPIO_MODE_OUTPUT);
+}
+static inline bool gpio_read(uint16_t pin) {
+  GPIO_Type *gpio = gpio_bank(pin);
+  uint32_t mask = (uint32_t) BIT(PINNO(pin));
+  return gpio->DR & mask;
+}
+static inline void gpio_write(uint16_t pin, bool value) {
+  GPIO_Type *gpio = gpio_bank(pin);
+  uint32_t mask = (uint32_t) BIT(PINNO(pin));
+  if (value) {
+    gpio->DR |= mask;
+  } else {
+    gpio->DR &= ~mask;
+  }
+}
+static inline void gpio_toggle(uint16_t pin) {
+  gpio_write(pin, !gpio_read(pin));
+}
+
+static inline void uart_init(LPUART_Type *uart, unsigned long baud) {
+  (void) uart, (void) baud;
+}
+#if 0
+
+static inline void uart_init(LPUART_Type *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 == USART1) freq = APB2_FREQUENCY, RCC->APB2ENR |= BIT(4);
+  if (uart == USART2) freq = APB1_FREQUENCY, RCC->APB1ENR |= BIT(17);
+  if (uart == USART3) freq = APB1_FREQUENCY, RCC->APB1ENR |= BIT(18);
+
+  if (uart == USART1) tx = PIN('A', 9), rx = PIN('A', 10);
+  if (uart == USART2) tx = PIN('A', 2), rx = PIN('A', 3);
+  if (uart == USART3) tx = PIN('D', 8), rx = PIN('D', 9);
+
+  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
+}
+#endif
+static inline void uart_write_byte(LPUART_Type *uart, uint8_t byte) {
+  // uart->TDR = byte;
+  // while ((uart->ISR & BIT(7)) == 0) spin(1);
+  (void) uart, (void) byte;
+}
+static inline void uart_write_buf(LPUART_Type *uart, char *buf, size_t len) {
+  while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
+}
+static inline int uart_read_ready(LPUART_Type *uart) {
+  (void) uart;
+  // return uart->ISR & BIT(5);  // If RXNE bit is set, data is ready
+  return 0;
+}
+static inline uint8_t uart_read_byte(LPUART_Type *uart) {
+  (void) uart;
+  // return (uint8_t) (uart->RDR & 255);
+  return 0;
+}
+
+static inline void rng_init(void) {
+}
+static inline uint32_t rng_read(void) {
+  return 42;
+}
+static inline void ethernet_init(void) {
+}

examples/nxp/rt1020-make-baremetal/link.ld

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+ENTRY(Reset_Handler);
+MEMORY {
+  flash_cfg(rx)  : ORIGIN = 0x60000000, LENGTH = 4k
+  flash_ivt(rx)  : ORIGIN = 0x60001000, LENGTH = 4k
+  flash_irq(rx)  : ORIGIN = 0x60002000, LENGTH = 1k
+  flash_code(rx) : ORIGIN = 0x60002400, LENGTH = 8183k
+
+  ram0(rx)       : ORIGIN = 0x00000000, LENGTH = 64k
+  ram1(rw)       : ORIGIN = 0x20000000, LENGTH = 64k 
+  ram2(rw)       : ORIGIN = 0x20200000, LENGTH = 128k 
+}
+__StackTop = ORIGIN(ram2) + LENGTH(ram2);
+
+SECTIONS {
+  .cfg  : { __FLASH_BASE = .; KEEP(* (.cfg)) } > flash_cfg
+  .ivt  : { KEEP(*(.ivt)) } > flash_ivt
+  .irq  : { KEEP(*(.isr_vector)) }  > flash_irq
+  .text : { *(.text* .text.*) *(.rodata*) __etext = .; } > flash_code
+  .data : { __data_start__ = .; *(.data SORT(.data.*)) __data_end__ = .; } > ram1 AT > flash_code
+  .bss  : { __bss_start__ = .; *(.bss SORT(.bss.*) COMMON) __bss_end__ = .; } > ram1
+  _end = .;
+}

examples/nxp/rt1020-make-baremetal/link2.ld

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+cmsis_mcu/devices/MIMXRT1021/gcc/MIMXRT1021xxxxx_ram.ld

examples/nxp/rt1020-make-baremetal/main.c

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+// Copyright (c) 2022-2023 Cesanta Software Limited
+// All rights reserved
+
+#include "hal.h"
+#include "mongoose.h"
+// #include "net.h"
+
+#define BLINK_PERIOD_MS 1000  // LED blinking period in millis
+
+static volatile uint64_t s_ticks;  // Milliseconds since boot
+void SysTick_Handler(void) {       // SyStick IRQ handler, triggered every 1ms
+  s_ticks++;
+}
+
+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);                                      // Blink LED
+  //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));
+  MG_INFO(("%p", arg));
+}
+
+int main(void) {
+  gpio_output(LED);               // Setup blue LED
+
+  for (;;) {
+    gpio_toggle(LED);
+    spin(99999);
+  }
+
+
+  uart_init(UART_DEBUG, 115200);  // Initialise debug printf
+  ethernet_init();                // Initialise ethernet pins
+  MG_INFO(("Starting, CPU freq %g MHz", (double) SystemCoreClock / 1000000));
+
+  struct mg_mgr mgr;        // Initialise
+  mg_mgr_init(&mgr);        // Mongoose event manager
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+  mg_timer_add(&mgr, BLINK_PERIOD_MS, MG_TIMER_REPEAT, timer_fn, NULL);
+
+#if 0
+  // Initialise Mongoose network stack
+  struct mg_tcpip_driver_stm32_data driver_data = {.mdc_cr = 4};
+  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..."));
+  web_init(&mgr);
+#endif
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  return 0;
+}

examples/nxp/rt1020-make-baremetal/mongoose.c

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

examples/nxp/rt1020-make-baremetal/mongoose.h

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