1 files changed, 44 insertions, 0 deletions
diff --git a/triscv/src/uart.c b/triscv/src/uart.c
new file mode 100644
index 0000000..492f0dd
--- /dev/null
+++ b/triscv/src/uart.c
@@ -0,0 +1,44 @@
+#include <triscv/uart.h>
+#include <utf9.h>
+
+struct uart {
+	/* guess this doesn't need much for now, at least until I add some state
+	 * stuff to it */
+};
+
+struct uart *uart_create()
+{
+	return calloc(1, sizeof(struct uart));
+}
+
+void uart_destroy(struct uart *uart)
+{
+	free(uart);
+}
+
+static void uart_write1(struct cpu *cpu, struct uart *uart, pm_t addr, tri_t t)
+{
+	(void)cpu;
+	(void)uart;
+	(void)addr;
+
+#define U8_LEN 16
+	uint8_t u8[U8_LEN] = {0};
+	size_t u9_read = 0;
+	size_t l = utf9_to_utf8(u8, U8_LEN, &t, 1, &u9_read);
+
+	for (size_t i = 0; i < l; ++i)
+		putchar(u8[i]);
+}
+
+struct dev uart_dev(struct uart *uart)
+{
+	return (struct dev){
+		.dev = uart,
+		.size = 1,
+		.write1 = (dev_write1_t)uart_write1,
+		.write3 = NULL, /* illegal */
+		.read1 = NULL, /* not supported for now */
+		.read3 = NULL
+	};
+}