1 /*
2 * Copyright (c) 2012 Ian McKellar
3 *
4 * Use of this source code is governed by a MIT-style
5 * license that can be found in the LICENSE file or at
6 * https://opensource.org/licenses/MIT
7 */
8 #include <stdarg.h>
9 #include <lk/reg.h>
10 #include <lk/debug.h>
11 #include <stdio.h>
12 #include <lib/cbuf.h>
13 #include <kernel/thread.h>
14 #include <platform/debug.h>
15 #include <arch/ops.h>
16 #include <target/debugconfig.h>
17 #include <arch/arm/cm.h>
18
19 #include "ti_driverlib.h"
20
21 #include "inc/hw_memmap.h"
22 #include "inc/hw_types.h"
23
24 #define DEBUG_UART UART0_BASE
25
26 static cbuf_t debug_rx_buf;
27
stellaris_uart0_irq(void)28 void stellaris_uart0_irq(void) {
29 arm_cm_irq_entry();
30
31 //
32 // Get the interrrupt status.
33 //
34 unsigned long ulStatus = UARTIntStatus(DEBUG_UART, true);
35
36 //
37 // Clear the asserted interrupts.
38 //
39 UARTIntClear(DEBUG_UART, ulStatus);
40
41 //
42 // Loop while there are characters in the receive FIFO.
43 //
44 bool resched = false;
45 while (UARTCharsAvail(DEBUG_UART)) {
46 //
47 // Read the next character from the UART and write it back to the UART.
48 //
49 unsigned char c = UARTCharGetNonBlocking(DEBUG_UART);
50 cbuf_write_char(&debug_rx_buf, c, false);
51
52 resched = true;
53 }
54
55 arm_cm_irq_exit(resched);
56 }
57
stellaris_debug_early_init(void)58 void stellaris_debug_early_init(void) {
59 SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
60
61 /* we only support UART0 right now */
62 STATIC_ASSERT(DEBUG_UART == UART0_BASE);
63
64 if (DEBUG_UART == UART0_BASE) {
65 #if defined(PART_LM4F120H5QR)
66 /* Set GPIO A0 and A1 as UART pins. */
67 GPIOPinConfigure(GPIO_PA0_U0RX);
68 GPIOPinConfigure(GPIO_PA1_U0TX);
69 GPIOPinTypeUART(GPIO_PORTA_AHB_BASE, GPIO_PIN_0 | GPIO_PIN_1);
70 #endif
71 }
72
73 UARTConfigSetExpClk(DEBUG_UART, SysCtlClockGet(), 115200, UART_CONFIG_WLEN_8|UART_CONFIG_STOP_ONE|UART_CONFIG_PAR_NONE);
74
75 UARTEnable(DEBUG_UART);
76 }
77
stellaris_debug_init(void)78 void stellaris_debug_init(void) {
79 cbuf_initialize(&debug_rx_buf, 16);
80
81 /* Enable the UART interrupt. */
82 UARTIntEnable(DEBUG_UART, UART_INT_RX | UART_INT_RT);
83
84 NVIC_EnableIRQ(INT_UART0 - 16);
85
86 }
87
platform_dputc(char c)88 void platform_dputc(char c) {
89 if (c == '\n') {
90 platform_dputc('\r');
91 }
92
93 UARTCharPut(DEBUG_UART, c);
94 }
95
platform_dgetc(char * c,bool wait)96 int platform_dgetc(char *c, bool wait) {
97 return cbuf_read_char(&debug_rx_buf, c, wait);
98 }
99
100