Ukázka debugovacích výpisů přes debug_*

src/usart-debug/Makefile

@@ -0,0 +1,6 @@
+ROOT=..
+BINARY=test
+OBJS=test.o
+LIB_OBJS=util-debug.o
+
+include $(ROOT)/example.mk

src/usart-debug/config.h

@@ -0,0 +1,14 @@
+/*
+ *	DMX512 Interface -- Configuration
+ *
+ *	(c) 2020 Martin Mareš <mj@ucw.cz>
+ */
+
+// Processor clock
+
+#define CPU_CLOCK_MHZ 72
+
+// Debugging port
+
+#define DEBUG_USART USART1
+#define DEBUG_LED_BLUEPILL

src/usart-debug/test.c

@@ -0,0 +1,34 @@
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+#include "util.h"
+
+int main(void)
+{
+	rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
+	rcc_periph_clock_enable(RCC_GPIOA);
+	rcc_periph_clock_enable(RCC_GPIOC);
+	rcc_periph_clock_enable(RCC_USART1);
+
+	// PC13 = BluePill LED
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
+
+	// PA10 = RX1, PA9 = TX1
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO10);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
+
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX_RX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+	usart_enable(USART1);
+
+	int cnt = 0;
+	for (;;) {
+		debug_printf("%d\n", cnt);
+		cnt++;
+	}
+}