Added some examples for the g0

examples/stm32/g0/Makefile.include

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+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+## Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+LIBNAME		= opencm3_stm32g0
+DEFS		+= -DSTM32G0
+
+FP_FLAGS	?= -msoft-float
+ARCH_FLAGS	= -mthumb -mcpu=cortex-m0 $(FP_FLAGS)
+
+################################################################################
+# OpenOCD specific variables
+
+OOCD		?= openocd
+OOCD_INTERFACE	?= stlink-v2-1
+OOCD_TARGET	?= stm32g0x
+
+################################################################################
+# Black Magic Probe specific variables
+# Set the BMP_PORT to a serial port and then BMP is used for flashing
+BMP_PORT	?=
+
+################################################################################
+# texane/stlink specific variables
+#STLINK_PORT	?= :4242
+
+
+include ../../../../rules.mk

examples/stm32/g0/nucleo-g031k8/miniblink/Makefile

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+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = miniblink
+
+LDSCRIPT = ../nucleo-g031k8.ld
+
+include ../../Makefile.include
+

examples/stm32/g0/nucleo-g031k8/miniblink/README.md

@@ -0,0 +1,10 @@
+# README
+
+This is the smallest-possible example program using libopencm3 and ST
+NUCLEO-G031K8 eval board.
+
+It should blink the blue LED on the board.
+
+## Board connections
+
+*none required*

examples/stm32/g0/nucleo-g031k8/miniblink/miniblink.c

@@ -0,0 +1,75 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ * Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/i2c.h>
+
+#define PORT_LED GPIOC
+#define PIN_LED GPIO6
+
+static void gpio_setup(void)
+{
+	/* Enable GPIOC clock. */
+	/* Manually: */
+	//RCC_AHBENR |= RCC_AHBENR_GPIOCEN;
+	/* Using API functions: */
+	rcc_periph_clock_enable(RCC_GPIOC);
+
+
+	/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
+	/* Using API functions: */
+	gpio_mode_setup(PORT_LED, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, PIN_LED);
+}
+
+int main(void)
+{
+	int i;
+
+	gpio_setup();
+
+	/* Blink the LED (PC8) on the board. */
+	while (1) {
+		/* Manually: */
+		// GPIOC_BSRR = PIN_LED;		/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// GPIOC_BRR = PIN_LED;			/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API functions gpio_set()/gpio_clear(): */
+		// gpio_set(PORT_LED, PIN_LED);		/* LED off */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+		// gpio_clear(PORT_LED, PIN_LED);	/* LED on */
+		// for (i = 0; i < 1000000; i++)	/* Wait a bit. */
+		//	__asm__("nop");
+
+		/* Using API function gpio_toggle(): */
+		gpio_toggle(PORT_LED, PIN_LED);	/* LED on/off */
+		for (i = 0; i < 1000000; i++) {	/* Wait a bit. */
+			__asm__("nop");
+		}
+	}
+
+	return 0;
+}

examples/stm32/g0/nucleo-g031k8/nucleo-g031k8.ld

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for ST NUCLEO-G031K8 (STM32G031K8, 64K flash, 8K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 8K
+}
+
+/* Include the common ld script. */
+INCLUDE cortex-m-generic.ld
+

examples/stm32/g0/nucleo-g031k8/usart/Makefile

@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usart
+
+LDSCRIPT = ../nucleo-g031k8.ld
+
+include ../../Makefile.include
+

examples/stm32/g0/nucleo-g031k8/usart/README.md

@@ -0,0 +1,12 @@
+# README
+
+This example program sends repeating sequence of characters "0123456789" on
+USART2 serial line of ST NUCLEO-G031K8 eval board.
+
+The sending is done in a blocking way.
+
+## Board connections
+
+| Port  | Function      | Description                       |
+| ----- | ------------- | --------------------------------- |
+| `PA2` | `(USART2_TX)`	| TTL serial output `(115200,8,N,1)` |

examples/stm32/g0/nucleo-g031k8/usart/usart.c

@@ -0,0 +1,98 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+#include <stdio.h>
+
+#define PORT_LED GPIOC
+#define PIN_LED GPIO6
+
+static void clock_setup(void)
+{
+	/* Enable GPIOC clock for LED & USARTs. */
+	rcc_periph_clock_enable(RCC_GPIOC);
+	rcc_periph_clock_enable(RCC_GPIOA);
+
+	/* Enable clocks for USART. */
+	rcc_periph_clock_enable(RCC_USART2);
+}
+
+static void usart_setup(void)
+{
+	/* Setup USART parameters. */
+	usart_set_baudrate(USART2, 115200);
+	usart_set_databits(USART2, 8);
+	usart_set_parity(USART2, USART_PARITY_NONE);
+	usart_set_stopbits(USART2, USART_CR2_STOPBITS_1);
+	usart_set_mode(USART2, USART_MODE_TX);
+	usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
+
+	/* Finally enable the USART. */
+	usart_enable(USART2);
+}
+
+static void gpio_setup(void)
+{
+	/* Setup GPIO pin GPIO8/9 on GPIO port C for LEDs. */
+	gpio_mode_setup(PORT_LED, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, PIN_LED);
+
+	/* Setup GPIO pins for USART transmit. */
+	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2);
+
+	/* Setup USART TX pin as alternate function. */
+	gpio_set_af(GPIOA, GPIO_AF1, GPIO2);
+}
+
+void uart_out(char* data) {
+    while(*data) {
+	    usart_send_blocking(USART2, *data++); /* USART2: Send byte. */
+    }
+}
+
+int main(void)
+{
+	int i, j = 0, c = 0;
+    char buf[256];
+
+	clock_setup();
+	gpio_setup();
+	usart_setup();
+    sprintf(buf, "Hello world\r\n");
+    uart_out(buf);
+
+	/* Blink the LED on the board with every transmitted byte. */
+	while (1) {
+		gpio_toggle(PORT_LED, PIN_LED);	/* LED on/off */
+		usart_send_blocking(USART2, c + '0'); /* USART2: Send byte. */
+		c = (c == 9) ? 0 : c + 1;	/* Increment c. */
+		if ((j++ % 80) == 0) {		/* Newline after line full. */
+			usart_send_blocking(USART2, '\r');
+			usart_send_blocking(USART2, '\n');
+		}
+		for (i = 0; i < 100000; i++) {	/* Wait a bit. */
+			__asm__("NOP");
+		}
+	}
+
+	return 0;
+}

examples/stm32/g0/nucleo-g031k8/usart_stdio/Makefile

@@ -0,0 +1,26 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = usart_stdio
+CSTD = -std=gnu99
+
+LDSCRIPT = ../nucleo-g031k8.ld
+
+include ../../Makefile.include
+

examples/stm32/g0/nucleo-g031k8/usart_stdio/README.md

@@ -0,0 +1,12 @@
+# README
+
+This example program sends a message "Pass: n" with increasing number n
+from 0 to 200 on USART2 serial line of ST NUCLEO-G031K8 eval board.
+
+The sending is done using newlib library in a blocking way.
+
+## Board connections
+
+| Port  | Function      | Description                       |
+| ----- | ------------- | --------------------------------- |
+| `PA2` | `(USART2_TX)` | TTL serial output `(115200,8,N,1)` |