From 261c210c9c4c1e55103a7af31dfcc539c0e0e5cc Mon Sep 17 00:00:00 2001
From: Jacques Comeaux <jacquesrcomeaux@protonmail.com>
Date: Fri, 19 Jan 2024 16:41:29 -0600
Subject: Add subroutine for printing hexadecimal word

---
 uart.s | 86 ------------------------------------------------------------------
 1 file changed, 86 deletions(-)
 delete mode 100644 uart.s

(limited to 'uart.s')

diff --git a/uart.s b/uart.s
deleted file mode 100644
index 19a2882..0000000
--- a/uart.s
+++ /dev/null
@@ -1,86 +0,0 @@
-.syntax unified
-.cpu cortex-m0plus
-.thumb
-
-.equ RESETS_BASE, 0x4000c000
-.equ RESET_OFST,      0x0
-.equ RESET_DONE_OFST, 0x8
-
-.equ IO_BANK0_BASE, 0x40014000
-.equ GPIO0_CTRL_OFST, 0x04
-.equ GPIO1_CTRL_OFST, 0x0c
-
-.equ UART0_BASE, 0x40034000
-.equ UARTDR_OFST,     0x00
-.equ UARTFR_OFST,     0x18
-.equ UARTIBRD_OFST,   0x24
-.equ UARTFBRD_OFST,   0x28
-.equ UARTLCR_H_OFST,  0x2c
-.equ UARTCR_OFST,     0x30
-
-.equ ATOMIC_SET,    0x2000
-.equ ATOMIC_CLEAR,  0x3000
-
-.type setup_uart, %function
-.global setup_uart
-
-setup_uart:
-
-  // Deassert reset
-  ldr r1, =(RESETS_BASE + ATOMIC_CLEAR)
-  movs r0, 0b1 // UART0
-  lsls r0, 22
-  str r0, [r1, RESET_OFST]
-  ldr r1, =RESETS_BASE
-1:
-  ldr r2, [r1, RESET_DONE_OFST]
-  tst r2, r0
-  beq 1b
-
-  // Configure and enable
-  ldr r1, =UART0_BASE
-  movs r0, 6
-  str r0, [r1, UARTIBRD_OFST]
-  movs r0, 33
-  str r0, [r1, UARTFBRD_OFST]
-  movs r0, 0b111 << 4 // 0b11 = word len 8 bits, 0b1 = FIFO enabled
-  str r0, [r1, UARTLCR_H_OFST]
-  ldr r1, =(UART0_BASE + ATOMIC_SET)
-  movs r0, 0b1 // UART enable
-  str r0, [r1, UARTCR_OFST]
-
-  // Configure GPIO 0 and 1 as TX and RX
-  ldr r1, =IO_BANK0_BASE
-  movs r0, 2 // UART function
-  str r0, [r1, GPIO0_CTRL_OFST]
-  str r0, [r1, GPIO1_CTRL_OFST]
-
-  bx lr
-
-.type uart_send, %function
-.global uart_send
-
-uart_send:
-  ldr r1, =UART0_BASE
-1:
-  ldr r2, [r1, UARTFR_OFST]
-  movs r3, 0b1 << 5 // TX FIFO full
-  tst r2, r3
-  bne 1b
-  movs r2, 0xff
-  ands r0, r2
-  str r0, [r1, UARTDR_OFST]
-  bx lr
-
-.type uart_recv, %function
-.global uart_recv
-
-uart_recv:
-  ldr r1, =UART0_BASE
-1:
-  ldr r2, [r1, UARTFR_OFST]
-  movs r3, 0b1 << 4 // RX FIFO empty
-  tst r2, r3
-  bne 1b
-  ldr r0, [r1, UARTDR_OFST]
-  bx lr
-- 
cgit v1.2.3