implement serial

1 files changed, 42 insertions, 0 deletions

diff --git a/kernel/serial/include/serial/serial.h b/kernel/serial/include/serial/serial.h
new file mode 100644
index 0000000..f6fcfc5
--- /dev/null
+++ b/kernel/serial/include/serial/serial.h
@@ -0,0 +1,42 @@
+#ifndef SERIAL_H
+#define SERIAL_H
+
+#include <stddef.h>
+#include "collection/rbuffer.h"
+#include "collection/list.h"
+
+#define USARTS 1
+#define SERIAL_BUFFER_SIZE 64
+
+struct serial_device_t {
+  volatile char __rx_buffer[SERIAL_BUFFER_SIZE];
+  volatile char __tx_buffer[SERIAL_BUFFER_SIZE];
+
+  struct rbuffer_t rx_buffer;
+  struct rbuffer_t tx_buffer;
+
+  struct list_head rx_q;
+  struct list_head tx_q;
+};
+
+#define SERIAL_DEVICE_INIT(name) \
+  { \
+    .rx_buffer = RBUFFER_ARRAY_INIT(name.__rx_buffer, SERIAL_BUFFER_SIZE), \
+    .tx_buffer = RBUFFER_ARRAY_INIT(name.__tx_buffer, SERIAL_BUFFER_SIZE), \
+    .rx_q = LIST_HEAD_INIT(name.rx_q), \
+    .tx_q = LIST_HEAD_INIT(name.tx_q) \
+  }
+
+void serial_init(unsigned long baud);
+
+size_t serial_read(char* const data, size_t size);
+
+size_t serial_write(const char* const data, size_t size);
+
+inline void serial_write_str(const char* const str) {
+  size_t length = 0;
+  for (length = 0; str[length] != 0; ++length){}
+  serial_write(str, length);
+}
+
+#endif
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