1 files changed, 42 insertions, 0 deletions
diff --git a/uart.h b/uart.h
new file mode 100644
index 0000000..5872484
--- /dev/null
+++ b/uart.h
@@ -0,0 +1,42 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <global.h>
+// board type, raspi2
+enum
+  {
+    // The offsets for reach register.
+
+    // Controls actuation of pull up/down to ALL GPIO pins.
+    GPPUD = (GPIO_BASE + 0x94),
+
+    // Controls actuation of pull up/down for specific GPIO pin.
+    GPPUDCLK0 = (GPIO_BASE + 0x98),
+
+    // The base address for UART.
+    UART0_BASE = 0x3F201000, // for raspi2 & 3, 0x20201000 for raspi1
+
+    // The offsets for reach register for the UART.
+    UART0_DR     = (UART0_BASE + 0x00),
+    UART0_RSRECR = (UART0_BASE + 0x04),
+    UART0_FR     = (UART0_BASE + 0x18),
+    UART0_ILPR   = (UART0_BASE + 0x20),
+    UART0_IBRD   = (UART0_BASE + 0x24),
+    UART0_FBRD   = (UART0_BASE + 0x28),
+    UART0_LCRH   = (UART0_BASE + 0x2C),
+    UART0_CR     = (UART0_BASE + 0x30),
+    UART0_IFLS   = (UART0_BASE + 0x34),
+    UART0_IMSC   = (UART0_BASE + 0x38),
+    UART0_RIS    = (UART0_BASE + 0x3C),
+    UART0_MIS    = (UART0_BASE + 0x40),
+    UART0_ICR    = (UART0_BASE + 0x44),
+    UART0_DMACR  = (UART0_BASE + 0x48),
+    UART0_ITCR   = (UART0_BASE + 0x80),
+    UART0_ITIP   = (UART0_BASE + 0x84),
+    UART0_ITOP   = (UART0_BASE + 0x88),
+    UART0_TDR    = (UART0_BASE + 0x8C),
+  };
+
+void uart_init();
+void uart_putc(unsigned char c);
+unsigned char uart_getc();
+void uart_puts(const char* str);