4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief STM32 debug support (implementation).
35 * \author Andrea Righi <arighi@develer.com>
38 #include "kdebug_stm32.h"
40 #include <cfg/cfg_debug.h>
42 #include <drv/gpio_stm32.h>
43 #include <drv/clock_stm32.h> /* RCC */
49 #if CONFIG_KDEBUG_PORT == 0
50 #define UART_BASE ((struct stm32_usart *)USART1_BASE)
51 #elif CONFIG_KDEBUG_PORT == 1
52 #define UART_BASE ((struct stm32_usart *)USART2_BASE)
53 #elif CONFIG_KDEBUG_PORT == 2
54 #define UART_BASE ((struct stm32_usart *)USART3_BASE)
56 #error "UART port not supported in this board"
59 #define KDBG_WAIT_READY() while (!(UART_BASE->SR & USART_FLAG_TXE))
60 #define KDBG_WAIT_TXDONE() while (!(UART_BASE->SR & USART_FLAG_TC))
62 #define KDBG_WRITE_CHAR(c) do { UART_BASE->DR = (c) & 0x1ff; } while(0)
64 /* Debug unit is used only for debug purposes so does not generate interrupts. */
65 #define KDBG_MASK_IRQ(old) do { (void)old; } while(0)
67 /* Debug unit is used only for debug purposes so does not generate interrupts. */
68 #define KDBG_RESTORE_IRQ(old) do { (void)old; } while(0)
70 typedef uint32_t kdbg_irqsave_t;
73 /* Initialize UART debug port */
74 INLINE void kdbg_hw_init(void)
76 /* Enable clocking on AFIO */
77 RCC->APB2ENR |= RCC_APB2_AFIO;
78 /* Configure USART pins */
79 #if CONFIG_KDEBUG_PORT == 0
80 RCC->APB2ENR |= RCC_APB2_GPIOA;
81 RCC->APB2ENR |= RCC_APB2_USART1;
82 stm32_gpioPinConfig((struct stm32_gpio *)GPIOA_BASE, GPIO_USART1_TX_PIN,
83 GPIO_MODE_AF_PP, GPIO_SPEED_50MHZ);
84 #elif CONFIG_KDEBUG_PORT == 1
85 RCC->APB2ENR |= RCC_APB2_GPIOA;
86 RCC->APB1ENR |= RCC_APB1_USART2;
87 stm32_gpioPinConfig((struct stm32_gpio *)GPIOA_BASE, GPIO_USART2_TX_PIN,
88 GPIO_MODE_AF_PP, GPIO_SPEED_50MHZ);
89 #elif CONFIG_KDEBUG_PORT == 2
90 RCC->APB2ENR |= RCC_APB2_GPIOB;
91 RCC->APB1ENR |= RCC_APB1_USART3;
92 stm32_gpioPinConfig((struct stm32_gpio *)GPIOB_BASE, GPIO_USART3_TX_PIN,
93 GPIO_MODE_AF_PP, GPIO_SPEED_50MHZ);
95 #error "UART port not supported in this board"
97 /* Enable the USART by writing the UE bit */
98 UART_BASE->CR1 |= CR1_RUN_SET;
99 /* Configure the desired baud rate */
100 UART_BASE->BRR = (uint16_t)evaluate_brr(UART_BASE, CPU_FREQ, CONFIG_KDEBUG_BAUDRATE);
101 /* Set the Transmitter Enable bit in CR1 */
102 UART_BASE->CR1 |= USART_MODE_TX;