From dd1616dba9eadf3b0d553b545e0d42eadac808cd Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Mon, 17 Feb 2020 22:27:16 +0100
Subject: [PATCH] test-bsb: Primitive tests...

---
 lib/util.h        |   2 +-
 test-bsb/Makefile |   8 ++++
 test-bsb/README   |  30 +++++++++++++
 test-bsb/config.h |   8 ++++
 test-bsb/test.c   | 107 ++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 154 insertions(+), 1 deletion(-)
 create mode 100644 test-bsb/Makefile
 create mode 100644 test-bsb/README
 create mode 100644 test-bsb/config.h
 create mode 100644 test-bsb/test.c

diff --git a/lib/util.h b/lib/util.h
index e31f7fd..f7fe61d 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -86,7 +86,7 @@ static inline void wait_for_interrupt(void)
 
 // util-debug.c
 
-void debug_printf(const char *fmt, ...);
+void debug_printf(const char *fmt, ...) __attribute__((format(printf,1,2)));
 void debug_puts(const char *s);
 void debug_putc(int c);
 
diff --git a/test-bsb/Makefile b/test-bsb/Makefile
new file mode 100644
index 0000000..cab70cc
--- /dev/null
+++ b/test-bsb/Makefile
@@ -0,0 +1,8 @@
+ROOT=..
+BINARY=test
+OBJS=test.o
+LIB_OBJS=util-debug.o
+
+WITH_SERIAL_FLASH=1
+
+include $(ROOT)/mk/bluepill.mk
diff --git a/test-bsb/README b/test-bsb/README
new file mode 100644
index 0000000..d65e8ad
--- /dev/null
+++ b/test-bsb/README
@@ -0,0 +1,30 @@
+Assignment of peripherals and pins
+==================================
+
+USART1	debugging
+USART3	BSB
+
+
+			   Blue Pill pinout
+			+--------------------+
+			| VBATT		3.3V |
+BluePill LED		| PC13		 GND |
+			| PC14		  5V |
+			| PC15		 PB9 |
+			| PA0		 PB8 |
+			| PA1		 PB7 |
+			| PA2		 PB6 |
+			| PA3		 PB5 |
+			| PA4		 PB4 |
+			| PA5		 PB3 |
+			| PA6		PA15 |
+			| PA7		PA12 |
+			| PB0		PA11 |
+			| PB1		PA10 |  RXD1 - debugging console
+TXD3 - BSB		| PB10		 PA9 |  TXD1 - debugging console
+RXD3 - BSB		| PB11		 PA8 |
+			| RESET		PB15 |
+			| 3.3 V		PB14 |
+			| GND		PB13 |
+			| GND		PB12 |
+			+--------------------+
diff --git a/test-bsb/config.h b/test-bsb/config.h
new file mode 100644
index 0000000..56f35a6
--- /dev/null
+++ b/test-bsb/config.h
@@ -0,0 +1,8 @@
+// Processor clock
+
+#define CPU_CLOCK_MHZ 72
+
+// Debugging port
+
+#define DEBUG_USART USART1
+#define DEBUG_LED_BLUEPILL
diff --git a/test-bsb/test.c b/test-bsb/test.c
new file mode 100644
index 0000000..f923ffc
--- /dev/null
+++ b/test-bsb/test.c
@@ -0,0 +1,107 @@
+#include "util.h"
+
+#include <libopencm3/cm3/cortex.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/cm3/scb.h>
+#include <libopencm3/cm3/systick.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+static void clock_setup(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_72mhz();
+
+	rcc_periph_clock_enable(RCC_GPIOB);
+	rcc_periph_clock_enable(RCC_GPIOC);
+	rcc_periph_clock_enable(RCC_USART1);
+	rcc_periph_clock_enable(RCC_USART3);
+
+	rcc_periph_reset_pulse(RST_GPIOB);
+	rcc_periph_reset_pulse(RST_GPIOC);
+	rcc_periph_reset_pulse(RST_USART1);
+	rcc_periph_reset_pulse(RST_USART3);
+}
+
+static void gpio_setup(void)
+{
+	// PC13 = BluePill LED
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
+	gpio_clear(GPIOC, GPIO13);
+}
+
+static volatile u32 ms_ticks;
+
+void sys_tick_handler(void)
+{
+	ms_ticks++;
+}
+
+static void tick_setup(void)
+{
+	systick_set_frequency(1000, 72000000);
+	systick_counter_enable();
+	systick_interrupt_enable();
+}
+
+static void delay_ms(uint ms)
+{
+	u32 start_ticks = ms_ticks;
+	while (ms_ticks - start_ticks < ms)
+		;
+}
+
+static void usart_setup(void)
+{
+	// Debugging USART
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO_USART1_RX);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
+
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART1);
+
+	// BSB USART
+	gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO_USART3_RX);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART3_TX);
+
+	usart_set_baudrate(USART3, 4800);
+	usart_set_databits(USART3, 8);
+	usart_set_stopbits(USART3, USART_STOPBITS_1);
+	usart_set_mode(USART3, USART_MODE_RX);
+	usart_set_parity(USART3, USART_PARITY_ODD);
+	usart_set_flow_control(USART3, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART3);
+}
+
+int main(void)
+{
+	clock_setup();
+	gpio_setup();
+	usart_setup();
+	tick_setup();
+	// This is needed when programming via serial boot loader, harmless otherwise.
+	SCB_VTOR = 0x08000000;
+	cm_enable_interrupts();
+
+	u32 start_ticks = ms_ticks;
+	for (;;) {
+		if (USART_SR(USART3) & USART_SR_RXNE) {
+			uint x = usart_recv(USART3);
+			debug_printf("%02x ", x);
+		}
+		if (ms_ticks - start_ticks >= 100) {
+			start_ticks = ms_ticks;
+			debug_led_toggle();
+			debug_putc(' ');
+		}
+	}
+
+	return 0;
+}
-- 
2.39.5