From 615e3302c9dd358bb64cd56d1f3814ad8d5df84d Mon Sep 17 00:00:00 2001
From: vetch <vetch97@gmail.com>
Date: Sat, 4 Jan 2020 19:37:32 +0100
Subject: rearranged files, updated makefile

---
 uart.c | 103 -----------------------------------------------------------------
 1 file changed, 103 deletions(-)
 delete mode 100644 uart.c

(limited to 'uart.c')

diff --git a/uart.c b/uart.c
deleted file mode 100644
index 2d4e176..0000000
--- a/uart.c
+++ /dev/null
@@ -1,103 +0,0 @@
-#include <stddef.h>
-#include <stdint.h>
-#include <uart.h>
-#include <global.h>
-
-// Loop <delay> times in a way that the compiler won't optimize away
-static inline void delay(int32_t count)
-{
-  asm volatile("__delay_%=: subs %[count], %[count], #1; bne __delay_%=\n"
-	       : "=r"(count): [count]"0"(count) : "cc");
-}
-
-void uart_init()
-{
-  // Disable PL011_UART.
-  wr32(PL011_UART_CR, 0);
-  
-  // Setup the GPIO pin 14 && 15.
-
-  // Disable pull up/down for all GPIO pins & delay for 150 cycles.
-  wr32(GPPUD, 0);
-  delay(150);
-
-  // Disable pull up/down for pin 14,15 & delay for 150 cycles.
-  wr32(GPPUDCLK0, (1 << 14) | (1 << 15));
-  delay(150);
-
-  // Write 0 to GPPUDCLK0 to make it take effect.
-  wr32(GPPUDCLK0, 0);
-
-  // Set integer & fractional part of baud rate.
-  // Divider = UART_CLOCK/(16 * Baud)
-  // Fraction part register = (Fractional part * 64) + 0.5
-  // UART_CLOCK = 3000000; Baud = 115200.
-
-  // Divider = 3000000 / (16 * 115200) = 1.627 = ~1.
-  wr32(PL011_UART_IBRD, 1);
-  // Fractional part register = (.627 * 64) + 0.5 = 40.6 = ~40.
-  wr32(PL011_UART_FBRD, 40);
-
-  // Set 8 bit data transmission (1 stop bit, no parity)
-  // and disable FIFO to be able to receive interrupt every received
-  // char, not every 2 chars
-  wr32(PL011_UART_LCRH, (1 << 5) | (1 << 6));
-
-  // set interrupt to come when transmit FIFO becomes ≤ 1/8 full
-  // or receive FIFO becomes ≥ 1/8 full
-  // (not really matters, since we disabled FIFOs)
-  wr32(PL011_UART_IFLS, 0);
-
-  // Enable PL011_UART, receive & transfer part of UART.2
-  wr32(PL011_UART_CR, (1 << 0) | (1 << 8) | (1 << 9));
-
-  // At first, it's probably safer to disable interrupts :)
-  uart_irq_disable();
-
-  // The above disables the entire uart irq;
-  // Also disable single sources within it
-  wr32(PL011_UART_IMSC, 0);
-}
-
-inline static _Bool can_transmit(void)
-{
-  return !(rd32(PL011_UART_FR) & (1 << 5));
-}
-
-inline static _Bool can_receive(void)
-{
-  return !(rd32(PL011_UART_FR) & (1 << 4));
-}
-
-void putchar(char c)
-{
-  while (!can_transmit());
-  
-  wr32(PL011_UART_DR, c);
-}
-
-char getchar(void)
-{
-  while (!can_receive());
-  
-  return rd32(PL011_UART_DR);
-}
-
-_Bool putchar_non_blocking(char c)
-{
-  if (can_transmit())
-    {
-      wr32(PL011_UART_DR, c);
-      return 0;
-    }
-
-  return 1;
-}
-
-int getchar_non_blocking(void)
-{
-  if (can_receive())
-    return rd32(PL011_UART_DR);
-
-  return -1;
-}
-- 
cgit v1.2.3