Add preliminary STM32F746ZG-Nucleo support

9 files changed, 357 insertions, 0 deletions

diff --git a/src/arch/stm32f746zg-nucleo/Kconfig b/src/arch/stm32f746zg-nucleo/Kconfig
new file mode 100644
index 0000000..1b634a7
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/Kconfig
@@ -0,0 +1,10 @@
+# Copyright 2024 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: CC0-1.0
+config arch_stm32f746zg_nucleo_driver_counter
+bool "Cycle Counter"
+select meta_driver_counter
+
+config arch_stm32f746zg_nucleo_driver_uptime
+bool "Uptime Counter"
+select meta_driver_uptime
diff --git a/src/arch/stm32f746zg-nucleo/Makefile.inc b/src/arch/stm32f746zg-nucleo/Makefile.inc
new file mode 100644
index 0000000..b6e1944
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/Makefile.inc
@@ -0,0 +1,140 @@
+# vim:ft=make
+#
+# Copyright 2024 Birte Kristina Friesel
+#
+# SPDX-License-Identifier: BSD-2-Clause
+
+SERIAL_PORT ?= ttyACM0
+
+cpu_freq ?= 216000000
+
+INCLUDES += -Iext/libopencm3/include
+
+COMMON_FLAGS += --static -nostartfiles -g3 -Os -fno-common
+COMMON_FLAGS += -ffunction-sections -fdata-sections
+COMMON_FLAGS += -mcpu=cortex-m7 -mthumb -mfloat-abi=hard -mfpu=fpv5-sp-d16 -DSTM32F7
+
+CC = arm-none-eabi-gcc
+CXX = arm-none-eabi-g++
+OBJCOPY = arm-none-eabi-objcopy
+OBJDUMP = arm-none-eabi-objdump
+SIZE = arm-none-eabi-size
+
+ARCH_SHORTNAME = stm32f7
+
+CXX_TARGETS += src/arch/stm32f746zg-nucleo/arch.cc
+
+ifdef CONFIG_aspectc
+	CXX = ag++ -r build/repo.acp -v 0 --c_compiler arm-none-eabi-g++ -p . --Xcompiler
+endif
+
+CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/gpio.cc
+CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/stdout.cc
+
+# Commandline
+
+ifneq ($(findstring counter,${arch_drivers}), )
+	CONFIG_arch_stm32f746zg_nucleo_driver_counter = y
+endif
+
+#ifneq ($(findstring timer,${arch_drivers}), )
+#	CONFIG_arch_stm32f746zg_nucleo_driver_timer = y
+#endif
+
+ifeq (${timer_s}, 1)
+	CONFIG_arch_stm32f746zg_nucleo_driver_uptime = y
+endif
+
+# Kconfig
+
+ifdef CONFIG_arch_stm32f746zg_nucleo_driver_counter
+	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/counter.cc
+endif
+
+#ifdef CONFIG_arch_stm32f746zg_nucleo_driver_i2c
+#	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/i2c.cc
+#endif
+
+#ifdef CONFIG_arch_stm32f746zg_nucleo_driver_timer
+#	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/timer.cc
+#endif
+
+ifdef CONFIG_arch_stm32f746zg_nucleo_driver_uptime
+	COMMON_FLAGS += -DTIMER_S
+	CXX_TARGETS += src/arch/stm32f746zg-nucleo/driver/uptime.cc
+endif
+
+
+ifneq (${cpu_freq}, )
+	COMMON_FLAGS += -DF_CPU=${cpu_freq}UL
+else
+	COMMON_FLAGS += -DF_CPU=216000000UL
+endif
+
+
+OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o} ${ASM_TARGETS:.S=.o}
+
+%.o : %.cc | include/config.h
+	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}
+
+%.o : %.c | include/config.h
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} ${CFLAGS} -c -o $@ ${@:.o=.c}
+
+%.o : %.S | include/config.h
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} -c -o $@ ${@:.o=.S}
+
+%.o : %.s | include/config.h
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} -c -o $@ ${@:.o=.S}
+
+build/system.elf: ${OBJECTS} ext/libopencm3/lib/libopencm3_stm32f7.a
+	${QUIET}mkdir -p build
+	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} \
+		-Lext/libopencm3/lib -Wl,--gc-sections \
+		-Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
+		-T src/arch/stm32f746zg-nucleo/stm32f746zg.ld \
+		${OBJECTS} -lopencm3_stm32f7 \
+		-o $@
+	${QUIET}${SIZE} build/system.elf | tail -n1 | awk '{ print "  ROM: " ($$1+$$2) " (" int(($$1+$$2)*100/1048576) "%)     RAM: " ($$2 + $$3) " (" int(($$2+$$3)*100/327680) "%)" }'
+
+ext/libopencm3/Makefile:
+	git submodule update --init
+
+ext/libopencm3/lib/libopencm3_stm32f7.a: ext/libopencm3/Makefile
+	${MAKE} -C ext/libopencm3
+
+program: build/system.elf
+	openocd -c 'source [find interface/stlink.cfg]' \
+		-c 'transport select hla_swd' -c 'source [find target/stm32f7x.cfg]' \
+		-c 'reset_config srst_only' -c '$$_TARGETNAME configure -rtos auto' \
+		-c 'reset_config connect_assert_srst' -c init -c targets \
+		-c 'reset halt' -c 'flash write_image erase "build/system.elf" 0' \
+		-c 'verify_image "build/system.elf" 0' -c 'reset run' -c 'shutdown'
+
+arch_clean:
+	${QUIET}rm -f ${OBJECTS}
+
+cat:
+	${QUIET}script/cat.py /dev/${SERIAL_PORT} 115200 ${cpu_freq} 65536
+
+monitor:
+	${QUIET}screen /dev/${SERIAL_PORT} 115200
+
+arch_help:
+	@echo "stm32f746zg-nucleo specific flags:"
+	@echo "    cpu_freq = ${cpu_freq} (desired CPU frequency in Hz)"
+	@echo "        supported frequencies: 84 / 168 / 180 MHz"
+
+arch_info:
+	@echo "CPU   Freq: ${cpu_freq} Hz"
+	@echo "Timer Freq: ${timer_freq} Hz -> $(shell src/arch/stm32f746zg-nucleo/model.py f_timer "${cpu_freq}" "${timer_freq}")"
+	@echo "I2C   Freq: ${i2c_freq} Hz"
+	@echo "Counter Overflow: 4294967296/255"
+	@echo "Monitor: /dev/${SERIAL_PORT} 115200"
+
+attributes: build/system.elf
+	${QUIET}script/size.py ${SIZE} text,data data,bss
+
+nfpvalues: build/system.elf
+	${QUIET}script/nfpvalues.py ${SIZE} text,data data,bss
+
+.PHONY: arch_clean arch_help arch_info attributes cat monitor program
diff --git a/src/arch/stm32f746zg-nucleo/arch.cc b/src/arch/stm32f746zg-nucleo/arch.cc
new file mode 100644
index 0000000..4adb883
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/arch.cc
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/timer.h>
+#include "arch.h"
+
+#ifdef __acweaving
+#define __delay_cycles(x)
+#endif
+
+void Arch::setup(void)
+{
+#if F_CPU == 216000000UL
+	rcc_clock_setup_hsi(&rcc_3v3[RCC_CLOCK_3V3_216MHZ]);
+#else
+#error Unsupported F_CPU
+#endif
+
+	// counter
+	rcc_periph_clock_enable(RCC_TIM2);
+	nvic_enable_irq(NVIC_TIM2_IRQ);
+	rcc_periph_reset_pulse(RST_TIM2);
+	timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT,
+		TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	timer_set_prescaler(TIM2, 0);
+	timer_disable_preload(TIM2);
+	timer_continuous_mode(TIM2);
+	timer_set_period(TIM2, 4294967295);
+	timer_enable_irq(TIM2, TIM_DIER_UIE);
+
+#ifdef CONFIG_loop
+	rcc_periph_clock_enable(RCC_TIM3);
+	nvic_enable_irq(NVIC_TIM3_IRQ);
+	rcc_periph_reset_pulse(RST_TIM3);
+
+
+	timer_set_mode(TIM3, TIM_CR1_CKD_CK_INT,
+		TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	// 10 kHz timer frequency
+	timer_set_prescaler(TIM3, ((rcc_apb1_frequency * 2) / 10000));
+
+	timer_continuous_mode(TIM3); // ?
+
+	timer_set_period(TIM3, 10000);
+
+	timer_enable_counter(TIM3);
+	timer_enable_irq(TIM3, TIM_DIER_UIE);
+#endif
+}
+
+#ifdef CONFIG_wakeup
+extern void wakeup();
+#endif
+
+#if defined(CONFIG_loop)
+extern void loop();
+volatile char run_loop = 0;
+#endif
+
+// for 216 MHz(?)
+void Arch::delay_us(unsigned int const us)
+{
+	volatile int x = us * 145;
+	while (x--) {
+		__asm("nop");
+	}
+}
+void Arch::delay_ms(unsigned int const ms)
+{
+	for (unsigned int i = 0; i < ms; i++) {
+		volatile int x = 143990;
+		while (x--) {
+			__asm("nop");
+		}
+	}
+}
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		//pwr_set_standby_mode();
+		__asm__("wfi");
+#ifdef CONFIG_loop
+		if (run_loop) {
+			loop();
+			run_loop = 0;
+		}
+#endif
+	}
+}
+
+void Arch::idle(void)
+{
+#ifdef CONFIG_wakeup
+	wakeup();
+#endif
+}
+
+Arch arch;
+
+#if defined(CONFIG_loop) || defined(TIMER_S)
+
+#include "driver/uptime.h"
+
+void tim3_isr(void)
+{
+	if (timer_get_flag(TIM3, TIM_SR_UIF)) {
+		timer_clear_flag(TIM3, TIM_SR_UIF);
+#ifdef CONFIG_loop
+		run_loop = 1;
+#endif
+#ifdef TIMER_S
+		uptime.tick_s();
+#endif
+	}
+}
+#endif
diff --git a/src/arch/stm32f746zg-nucleo/driver/counter.cc b/src/arch/stm32f746zg-nucleo/driver/counter.cc
new file mode 100644
index 0000000..5f007f1
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/driver/counter.cc
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+#include "driver/counter.h"
+
+Counter counter;
+
+void tim2_isr(void)
+{
+	if (timer_get_flag(TIM2, TIM_SR_UIF)) {
+		timer_clear_flag(TIM2, TIM_SR_UIF);
+		if (counter.overflow < 4294967295) {
+			counter.overflow++;
+		}
+	}
+}
diff --git a/src/arch/stm32f746zg-nucleo/driver/gpio.cc b/src/arch/stm32f746zg-nucleo/driver/gpio.cc
new file mode 100644
index 0000000..82a9fd0
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/driver/gpio.cc
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/gpio.h"
+
+GPIO gpio;
diff --git a/src/arch/stm32f746zg-nucleo/driver/stdout.cc b/src/arch/stm32f746zg-nucleo/driver/stdout.cc
new file mode 100644
index 0000000..9a5bdfb
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/driver/stdout.cc
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/stdout.h"
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+void StandardOutput::setup()
+{
+	rcc_periph_clock_enable(RCC_USART3);
+	gpio_mode_setup(GPIOD, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO8);
+	gpio_set_af(GPIOD, GPIO_AF7, GPIO8);
+
+	usart_set_baudrate(USART3, 115200);
+	usart_set_databits(USART3, 8);
+	usart_set_stopbits(USART3, USART_STOPBITS_1);
+	usart_set_mode(USART3, USART_MODE_TX);
+	usart_set_parity(USART3, USART_PARITY_NONE);
+	usart_set_flow_control(USART3, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART3);
+}
+
+void StandardOutput::put(char c)
+{
+	usart_send_blocking(USART3, c);
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput kout;
diff --git a/src/arch/stm32f746zg-nucleo/driver/uptime.cc b/src/arch/stm32f746zg-nucleo/driver/uptime.cc
new file mode 100644
index 0000000..8ddb57a
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/driver/uptime.cc
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/uptime.h"
+
+Uptime uptime;
diff --git a/src/arch/stm32f746zg-nucleo/prompt b/src/arch/stm32f746zg-nucleo/prompt
new file mode 100644
index 0000000..168f0e0
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/prompt
@@ -0,0 +1 @@
+STM32F746ZG Nucleo
diff --git a/src/arch/stm32f746zg-nucleo/stm32f746zg.ld b/src/arch/stm32f746zg-nucleo/stm32f746zg.ld
new file mode 100644
index 0000000..7680d9f
--- /dev/null
+++ b/src/arch/stm32f746zg-nucleo/stm32f746zg.ld
@@ -0,0 +1,13 @@
+/*
+ * Copyright 2024 Birte Kristina Friesel
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+MEMORY
+{
+	rom (rx)  : ORIGIN = 0x08000000, LENGTH = 1024K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 320K
+}
+
+INCLUDE ext/libopencm3/lib/cortex-m-generic.ld