basic uart: f4 and f3, prepping tests for usart-v2

use parity to at least test a little more of the common code

1 files changed, 71 insertions, 0 deletions

diff --git a/tests/uart-basic/uart-basic.c b/tests/uart-basic/uart-basic.c
new file mode 100644
index 0000000..4dae0e1
--- /dev/null
+++ b/tests/uart-basic/uart-basic.c
@@ -0,0 +1,71 @@
+/*
+ * Karl Palsson <karlp@tweak.net.au> Oct 2017
+ * Considered to be available under your choice of:
+ * BSD2 clause, Apache2, MIT, X11 or ISC licenses
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/usart.h>
+#include "uart-basic.h"
+
+/* prototype to make linking happy */
+int _write(int file, char *ptr, int len);
+
+static struct ub_hw *ub;
+static uint8_t last_rxb;
+
+/* Implement _write for newlib to use printf */
+int _write(int file, char *ptr, int len)
+{
+	int i;
+
+	if (file == STDOUT_FILENO || file == STDERR_FILENO) {
+		for (i = 0; i < len; i++) {
+			if (ptr[i] == '\n') {
+				usart_send_blocking(ub->uart, '\r');
+			}
+			usart_send_blocking(ub->uart, ptr[i]);
+		}
+		return i;
+	}
+	errno = EIO;
+	return -1;
+}
+
+void ub_init(struct ub_hw *ub_input)
+{
+	ub = ub_input;
+	rcc_periph_clock_enable(ub->uart_rcc);
+
+	usart_set_baudrate(ub->uart, 115200);
+	usart_set_databits(ub->uart, 9);
+	usart_set_stopbits(ub->uart, USART_STOPBITS_1);
+	usart_set_mode(ub->uart, USART_MODE_TX_RX);
+	usart_set_parity(ub->uart, USART_PARITY_EVEN);
+	usart_set_flow_control(ub->uart, USART_FLOWCONTROL_NONE);
+
+	usart_enable_rx_interrupt(ub->uart);
+	nvic_enable_irq(ub->uart_nvic);
+	usart_enable(ub->uart);
+}
+
+void ub_task(void)
+{
+	if (last_rxb) {
+		printf("Last rx char was: <%c>\n", last_rxb);
+		last_rxb = 0;
+	} else {
+		printf("enter a character!\n");
+	}
+}
+
+void ub_irq_handler(void)
+{
+	if (usart_get_flag(ub->uart, USART_SR_RXNE)) {
+		last_rxb = usart_recv(ub->uart);
+	}
+}