Protab: USART

diff --git a/protab/usart1/Makefile b/protab/usart1/Makefile
new file mode 100644 (file)
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 (file)
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 (file)
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 (file)
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);
+       }
+}