simple code that blinks the led..

blinkled/Makefile

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+# Copyright 2021 John-Mark Gurney.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+.if $(.OBJDIR) == $(.CURDIR)
+.error Need to set MAKEOBJDIR.
+.endif
+
+PLATFORM != uname -s
+
+.if $(PLATFORM) == "Darwin"
+SOEXT=dylib
+.else
+.error Unsupported platform: $(PLATFORM)
+.endif
+
+PROGS = blinkled
+
+SRCS.blinkled = main.c
+SRCS.blinkled+= $(SRCTOP)/rs485hid/memdebug.c
+
+CFLAGS+= -I$(.CURDIR)
+CFLAGS+= -g
+#CFLAGS+= -DNDEBUG
+
+WITH_STM32F103 = yes
+
+.include <../mk/boards.mk>
+
+CFLAGS+= -Werror -Wall
+
+.include <../mk/mu.progs.mk>

blinkled/main.c

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+/*-
+ * Copyright 2021 John-Mark Gurney.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include <string.h>
+
+#include <misc.h>
+
+#include <sysinit.h>
+
+#include <stm32f1xx_hal.h>
+
+static void
+c13led(const void *none)
+{
+	GPIO_InitTypeDef GPIO_InitStruct;
+
+	__HAL_RCC_GPIOB_CLK_ENABLE();
+	__HAL_RCC_GPIOC_CLK_ENABLE();
+
+	GPIO_InitStruct = (GPIO_InitTypeDef){
+		.Pin = GPIO_PIN_13,
+		.Mode = GPIO_MODE_OUTPUT_PP,
+		.Pull = GPIO_NOPULL,
+		.Speed = GPIO_SPEED_FREQ_LOW,
+	};
+	HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+	HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);
+}
+SYSINIT(c13led, SI_SUB_HAL, SI_ORDER_SECOND, c13led, NULL);
+
+int
+main(void)
+{
+
+	sysinit_run();
+
+	debug_printf("starting...\n");
+
+	/* toggle on LED */
+	for (;;) {
+		HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);
+		HAL_Delay(250);
+		HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_SET);
+		HAL_Delay(250);
+	}
+}