From 38f0e84d3b5da56c1441f2f779246ccf7b23d5c4 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Thu, 18 Feb 2021 23:01:57 +0100
Subject: add minimal LM4F120H5QR (LM4F120XL Stellaris Launchpad) support

---
 src/arch/lm4f120h5qr-stellaris/Makefile.inc       | 130 ++++++++++++++++
 src/arch/lm4f120h5qr-stellaris/arch.cc            |  79 ++++++++++
 src/arch/lm4f120h5qr-stellaris/driver/gpio.cc     |   8 +
 src/arch/lm4f120h5qr-stellaris/driver/stdout.cc   |  26 ++++
 src/arch/lm4f120h5qr-stellaris/driver/uptime.cc   |   8 +
 src/arch/lm4f120h5qr-stellaris/lm4f120h5qr.ld     |  11 ++
 src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c | 177 ++++++++++++++++++++++
 src/arch/lm4f120h5qr-stellaris/prompt             |   1 +
 8 files changed, 440 insertions(+)
 create mode 100644 src/arch/lm4f120h5qr-stellaris/Makefile.inc
 create mode 100644 src/arch/lm4f120h5qr-stellaris/arch.cc
 create mode 100644 src/arch/lm4f120h5qr-stellaris/driver/gpio.cc
 create mode 100644 src/arch/lm4f120h5qr-stellaris/driver/stdout.cc
 create mode 100644 src/arch/lm4f120h5qr-stellaris/driver/uptime.cc
 create mode 100644 src/arch/lm4f120h5qr-stellaris/lm4f120h5qr.ld
 create mode 100644 src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c
 create mode 100644 src/arch/lm4f120h5qr-stellaris/prompt

(limited to 'src')

diff --git a/src/arch/lm4f120h5qr-stellaris/Makefile.inc b/src/arch/lm4f120h5qr-stellaris/Makefile.inc
new file mode 100644
index 0000000..d49391b
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/Makefile.inc
@@ -0,0 +1,130 @@
+# vim:ft=make
+#
+# Copyright 2021 Daniel Friesel
+#
+# SPDX-License-Identifier: BSD-2-Clause
+
+SERIAL_PORT ?= ttyACM0
+
+cpu_freq ?= 80000000
+
+INCLUDES += -Iext/libopencm3/include
+
+COMMON_FLAGS += --static -nostartfiles -g3 -Os -fno-common
+COMMON_FLAGS += -ffunction-sections -fdata-sections
+COMMON_FLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DLM4F
+
+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
+
+C_TARGETS += src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c
+CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/arch.cc
+
+ifdef CONFIG_aspectc
+	CXX = ag++ -r build/repo.acp -v 0 --c_compiler arm-none-eabi-g++ -p . --Xcompiler
+endif
+
+ifneq ($(findstring adc,${arch_drivers}), )
+	CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/adc.cc
+endif
+
+CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/gpio.cc
+CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/stdout.cc
+
+# Commandline
+
+ifneq ($(findstring counter,${arch_drivers}), )
+	CONFIG_arch_lm4f120h5qr_stellaris_driver_counter = y
+endif
+
+#ifneq ($(findstring timer,${arch_drivers}), )
+#	CONFIG_arch_lm4f120h5qr_stellaris_driver_timer = y
+#endif
+
+ifeq (${timer_s}, 1)
+	CONFIG_arch_lm4f120h5qr_stellaris_driver_uptime = y
+endif
+
+# Kconfig
+
+ifdef CONFIG_arch_lm4f120h5qr_stellaris_driver_counter
+	CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/counter.cc
+endif
+
+#ifdef CONFIG_arch_lm4f120h5qr_stellaris_driver_timer
+#	CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/timer.cc
+#endif
+
+ifdef CONFIG_arch_lm4f120h5qr_stellaris_driver_uptime
+	COMMON_FLAGS += -DTIMER_S
+	CXX_TARGETS += src/arch/lm4f120h5qr-stellaris/driver/uptime.cc
+endif
+
+
+ifneq (${cpu_freq}, )
+	COMMON_FLAGS += -DF_CPU=${cpu_freq}UL
+else
+	COMMON_FLAGS += -DF_CPU=80000000UL
+endif
+
+
+OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o} ${ASM_TARGETS:.S=.o}
+
+.cc.o:
+	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}
+
+.c.o:
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} ${CFLAGS} -c -o $@ ${@:.o=.c}
+
+.S.o:
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} -c -o $@ ${@:.o=.S}
+
+.s.o:
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} -c -o $@ ${@:.o=.S}
+
+ext/libopencm3/Makefile:
+	git submodule update --init
+
+ext/libopencm3/lib/libopencm3_lm4f.a: ext/libopencm3/Makefile
+	${MAKE} -C ext/libopencm3
+
+build/system.elf: ${OBJECTS} ext/libopencm3/lib/libopencm3_stm32f4.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/lm4f120h5qr-stellaris/lm4f120h5qr.ld \
+		${OBJECTS} -lopencm3_lm4f \
+		-o $@
+	${QUIET}${SIZE} build/system.elf | tail -n1 | awk '{ print "  ROM: " ($$1+$$2) " (" int(($$1+$$2)*100/49152) "%)     RAM: " ($$2 + $$3) " (" int(($$2+$$3)*100/4096) "%)" }'
+
+program: build/system.elf
+	${OBJCOPY} -O binary build/system.elf build/system.bin
+	lm4flash build/system.bin
+
+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 "lm4f120h5qr-stellaris specific flags:"
+
+arch_info:
+	@echo "CPU   Freq: ${cpu_freq} Hz"
+	@echo "Timer Freq: ${timer_freq} Hz"
+	@echo "I2C   Freq: ${i2c_freq} Hz"
+	@echo "Counter Overflow: 65536/255"
+	@echo "Monitor: /dev/${SERIAL_PORT} 115200"
+
+attributes: build/system.elf
+	${QUIET}script/size.py ${SIZE} text,data data,bss
+
+.PHONY: arch_clean arch_help arch_info attributes cat monitor program
diff --git a/src/arch/lm4f120h5qr-stellaris/arch.cc b/src/arch/lm4f120h5qr-stellaris/arch.cc
new file mode 100644
index 0000000..c87af2f
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/arch.cc
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "arch.h"
+
+#ifdef TIMER_S
+#include "driver/uptime.h"
+#endif
+
+extern "C" {
+#include "lm4f_cpp_wrapper.h"
+};
+
+#ifdef __acweaving
+#define __delay_cycles(x)
+#endif
+
+void Arch::setup(void)
+{
+	arch_clock_init();
+#if defined(WITH_LOOP)
+	arch_init_loop();
+#endif
+}
+
+#ifdef WITH_WAKEUP
+extern void wakeup();
+#endif
+
+#if defined(WITH_LOOP)
+extern void loop();
+extern volatile char run_loop;
+#endif
+
+// for 80 MHz
+void Arch::delay_us(unsigned int const us)
+{
+	volatile int x = us * 77;
+	while (x--) {
+		__asm("nop");
+	}
+}
+void Arch::delay_ms(unsigned int const ms)
+{
+	for (unsigned int i = 0; i < ms; i++) {
+		volatile int x = 10000;
+		while (x--) {
+			__asm("nop");
+		}
+	}
+}
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		__asm__("wfi");
+#ifdef WITH_LOOP
+		if (run_loop) {
+#ifdef TIMER_S
+			uptime.tick_s();
+#endif
+			loop();
+			run_loop = 0;
+		}
+#endif
+	}
+}
+
+void Arch::idle(void)
+{
+	__asm__("wfi");
+#ifdef WITH_WAKEUP
+	wakeup();
+#endif
+}
+
+Arch arch;
diff --git a/src/arch/lm4f120h5qr-stellaris/driver/gpio.cc b/src/arch/lm4f120h5qr-stellaris/driver/gpio.cc
new file mode 100644
index 0000000..5b17f1e
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/driver/gpio.cc
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/gpio.h"
+
+GPIO gpio;
diff --git a/src/arch/lm4f120h5qr-stellaris/driver/stdout.cc b/src/arch/lm4f120h5qr-stellaris/driver/stdout.cc
new file mode 100644
index 0000000..18b6da4
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/driver/stdout.cc
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/stdout.h"
+
+extern "C" {
+#include "lm4f_cpp_wrapper.h"
+};
+
+
+void StandardOutput::setup()
+{
+	mp_uart_setup();
+}
+
+void StandardOutput::put(char c)
+{
+	mp_uart_send_blocking(c);
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput kout;
diff --git a/src/arch/lm4f120h5qr-stellaris/driver/uptime.cc b/src/arch/lm4f120h5qr-stellaris/driver/uptime.cc
new file mode 100644
index 0000000..7e37a7b
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/driver/uptime.cc
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include "driver/uptime.h"
+
+Uptime uptime;
diff --git a/src/arch/lm4f120h5qr-stellaris/lm4f120h5qr.ld b/src/arch/lm4f120h5qr-stellaris/lm4f120h5qr.ld
new file mode 100644
index 0000000..0bc8fe2
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/lm4f120h5qr.ld
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+MEMORY {
+	rom  (rx) : ORIGIN = 0x00000000, LENGTH = 256K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 32K
+}
+
+INCLUDE cortex-m-generic.ld
diff --git a/src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c b/src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c
new file mode 100644
index 0000000..62f1c20
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/lm4f_cpp_wrapper.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright 2021 Daniel Friesel
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/cm3/systick.h>
+#include <libopencm3/lm4f/systemcontrol.h>
+#include <libopencm3/lm4f/rcc.h>
+#include <libopencm3/lm4f/gpio.h>
+#include <libopencm3/lm4f/nvic.h>
+#include <libopencm3/lm4f/uart.h>
+
+void arch_clock_init()
+{
+	// 16MHz Crystal -> 400 MHz PLL -> 80 MHz (/5)
+	rcc_sysclk_config(OSCSRC_MOSC, XTAL_16M, 5);
+}
+
+#ifdef WITH_LOOP
+volatile char run_loop = 1;
+
+void arch_init_loop()
+{
+	systick_clear();
+	systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
+	systick_set_frequency(2, F_CPU);
+	systick_counter_enable();
+	systick_interrupt_enable();
+
+	//periph_clock_enable(RCC_TIMER3);
+}
+
+void sys_tick_handler()
+{
+	run_loop = 1;
+}
+#endif
+
+void mp_uart_setup()
+{
+	gpio_set_af(GPIOA, 1, GPIO0 | GPIO1);
+
+	periph_clock_enable(RCC_UART0);
+
+	__asm__("nop");
+
+	uart_disable(UART0);
+
+	uart_clock_from_piosc(UART0);
+
+	uart_set_baudrate(UART0, 9600);
+	uart_set_databits(UART0, 8);
+	uart_set_parity(UART0, UART_PARITY_NONE);
+	uart_set_stopbits(UART0, 1);
+
+	uart_enable(UART0);
+}
+
+void mp_uart_send_blocking(char c)
+{
+	uart_send_blocking(UART0, c);
+}
+
+#define pb_0 8
+#define pc_0 16
+#define pd_0 24
+#define pe_0 32
+#define pf_0 40
+#define PIN_INVALID 45
+
+void mp_gpio_setup()
+{
+	const unsigned int outpins = GPIO1 | GPIO3 | GPIO2;
+
+	gpio_enable_ahb_aperture();
+
+	periph_clock_enable(RCC_GPIOA);
+	periph_clock_enable(RCC_GPIOB);
+	periph_clock_enable(RCC_GPIOC);
+	periph_clock_enable(RCC_GPIOD);
+	periph_clock_enable(RCC_GPIOE);
+	periph_clock_enable(RCC_GPIOF);
+
+	gpio_mode_setup(GPIOF, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
+	gpio_set_output_config(GPIOF, GPIO_OTYPE_PP, GPIO_DRIVE_2MA, outpins);
+}
+
+void mp_gpio_input(unsigned char const pin)
+{
+	if (pin < pb_0) {
+		gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << pin);
+	} else if (pin < pc_0) {
+		gpio_mode_setup(GPIOB, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << (pin - pb_0));
+	} else if (pin < pd_0) {
+		gpio_mode_setup(GPIOC, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << (pin - pc_0));
+	} else if (pin < pe_0) {
+		gpio_mode_setup(GPIOD, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << (pin - pd_0));
+	} else if (pin < pf_0) {
+		gpio_mode_setup(GPIOE, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << (pin - pe_0));
+	} else if (pin < PIN_INVALID) {
+		gpio_mode_setup(GPIOF, GPIO_MODE_INPUT, GPIO_PUPD_NONE, 1 << (pin - pf_0));
+	}
+}
+
+void mp_gpio_output(unsigned char const pin)
+{
+	if (pin < pb_0) {
+		gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << pin);
+	} else if (pin < pc_0) {
+		gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << (pin - pb_0));
+	} else if (pin < pd_0) {
+		gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << (pin - pc_0));
+	} else if (pin < pe_0) {
+		gpio_mode_setup(GPIOD, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << (pin - pd_0));
+	} else if (pin < pf_0) {
+		gpio_mode_setup(GPIOE, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << (pin - pe_0));
+	} else if (pin < PIN_INVALID) {
+		gpio_mode_setup(GPIOF, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, 1 << (pin - pf_0));
+	}
+}
+
+unsigned int mp_gpio_read(unsigned char const pin) {
+	if (pin < pb_0) {
+		return gpio_read(GPIOA, 1 << pin);
+	} else if (pin < pc_0) {
+		return gpio_read(GPIOB, 1 << (pin-pb_0));
+	} else if (pin < pd_0) {
+		return gpio_read(GPIOC, 1 << (pin-pc_0));
+	} else if (pin < pe_0) {
+		return gpio_read(GPIOD, 1 << (pin-pd_0));
+	} else if (pin < pf_0) {
+		return gpio_read(GPIOE, 1 << (pin-pe_0));
+	} else if (pin < PIN_INVALID) {
+		return gpio_read(GPIOF, 1 << (pin-pf_0));
+	}
+}
+
+void mp_gpio_write(unsigned char const pin, unsigned char value) {
+	if (pin < pb_0) {
+		if (value) {
+			gpio_port_write(GPIOA, gpio_port_read(GPIOA) | (1 << pin));
+		} else {
+			gpio_port_write(GPIOA, gpio_port_read(GPIOA) & ~(1 << pin));
+		}
+	} else if (pin < pc_0) {
+		if (value) {
+			gpio_port_write(GPIOB, gpio_port_read(GPIOB) | (1 << (pin-pb_0)));
+		} else {
+			gpio_port_write(GPIOB, gpio_port_read(GPIOB) & ~(1 << (pin-pb_0)));
+		}
+	} else if (pin < pd_0) {
+		if (value) {
+			gpio_port_write(GPIOC, gpio_port_read(GPIOC) | (1 << (pin-pc_0)));
+		} else {
+			gpio_port_write(GPIOC, gpio_port_read(GPIOC) & ~(1 << (pin-pc_0)));
+		}
+	} else if (pin < pe_0) {
+		if (value) {
+			gpio_port_write(GPIOD, gpio_port_read(GPIOD) | (1 << (pin-pd_0)));
+		} else {
+			gpio_port_write(GPIOD, gpio_port_read(GPIOD) & ~(1 << (pin-pd_0)));
+		}
+	} else if (pin < pf_0) {
+		if (value) {
+			gpio_port_write(GPIOE, gpio_port_read(GPIOE) | (1 << (pin-pe_0)));
+		} else {
+			gpio_port_write(GPIOE, gpio_port_read(GPIOE) & ~(1 << (pin-pe_0)));
+		}
+	} else if (pin < PIN_INVALID) {
+		if (value) {
+			gpio_port_write(GPIOF, gpio_port_read(GPIOF) | (1 << (pin-pf_0)));
+		} else {
+			gpio_port_write(GPIOF, gpio_port_read(GPIOF) & ~(1 << (pin-pf_0)));
+		}
+	}
+}
diff --git a/src/arch/lm4f120h5qr-stellaris/prompt b/src/arch/lm4f120h5qr-stellaris/prompt
new file mode 100644
index 0000000..335db16
--- /dev/null
+++ b/src/arch/lm4f120h5qr-stellaris/prompt
@@ -0,0 +1 @@
+LM4F120XL Stellaris Launchpad
-- 
cgit v1.2.3