From: Martin Mares <mj@ucw.cz>
Date: Tue, 30 Jul 2019 22:06:39 +0000 (+0200)
Subject: Protab: USART
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=10cbb998e43dbaef8d4cf7c8fe97c8265b34fea3;p=home-hw.git

Protab: USART
---

diff --git a/protab/usart1/Makefile b/protab/usart1/Makefile
new file mode 100644
index 0000000..117ad11
--- /dev/null
+++ b/protab/usart1/Makefile
@@ -0,0 +1,6 @@
+ROOT=../..
+BINARY=usart
+OBJS=usart.o
+LIB_OBJS=
+
+include $(ROOT)/mk/bluepill.mk
diff --git a/protab/usart1/usart.c b/protab/usart1/usart.c
new file mode 100644
index 0000000..cca6770
--- /dev/null
+++ b/protab/usart1/usart.c
@@ -0,0 +1,38 @@
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+int main(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_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_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, 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 c = 32;
+	for (;;) {
+		gpio_toggle(GPIOC, GPIO13);
+
+		usart_send(USART1, c);
+		usart_wait_send_ready(USART1);
+
+		c++;
+		if (c == 127)
+			c = 32;
+	}
+}
diff --git a/protab/usart2/Makefile b/protab/usart2/Makefile
new file mode 100644
index 0000000..117ad11
--- /dev/null
+++ b/protab/usart2/Makefile
@@ -0,0 +1,6 @@
+ROOT=../..
+BINARY=usart
+OBJS=usart.o
+LIB_OBJS=
+
+include $(ROOT)/mk/bluepill.mk
diff --git a/protab/usart2/usart.c b/protab/usart2/usart.c
new file mode 100644
index 0000000..0157140
--- /dev/null
+++ b/protab/usart2/usart.c
@@ -0,0 +1,36 @@
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/usart.h>
+
+int main(void)
+{
+	rcc_clock_setup_in_hse_8mhz_out_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);
+
+	for (;;) {
+		gpio_toggle(GPIOC, GPIO13);
+
+		usart_wait_recv_ready(USART1);
+		int c = usart_recv(USART1);
+
+		usart_send(USART1, c);
+		usart_wait_send_ready(USART1);
+	}
+}