我正在尝试通过 AVR32 UC3C 使用 USART(rs232) 进行通信。我遵循了链接上给出的示例 - http://simplemachines.it/martin/mizar32/1.6.0-AT32UC3/DRIVERS/INTC/EXAMPLE/interrupt_usart_example.c。
/* This source file is part of the ATMEL AVR32-UC3-SoftwareFramework-1.6.0 Release */
/*This file is prepared for Doxygen automatic documentation generation.*/
/*! \file *********************************************************************
*
* \brief Example of an interrupt-driven USART communication.
*
* This file contains an example using the USART module with interrupts.
*
* It will display a string on the screen. Refer to the usart_options structure
* in main for configuration options for your terminal.
*
* Please make sure that the correct jumper(s) is/are set on your development
* board. Refer to your hardware reference guide if necessary.
*
* - Compiler: IAR EWAVR32 and GNU GCC for AVR32
* - Supported devices: All AVR32 devices with an INTC module can be used.
* - AppNote:
*
* \author Atmel Corporation: http://www.atmel.com \n
* Support and FAQ: http://support.atmel.no/
*
******************************************************************************/
/*! \page License
* Copyright (c) 2009 Atmel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an Atmel
* AVR product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*
*/
/*! \mainpage
* \section intro Introduction
* This is the documentation for the data structures, functions, variables,
* defines, enums, and typedefs for the interrupt controller driver. It also
* comes bundled with a basic application as an example of usage.
*
* This example demonstrates how to use the INTC driver for the USART RXRDY
* interrupt.
*
* Operating mode: each character typed on the PC terminal is echoed back.
*
* \note The IAR built-in event handling mechanism manages interrupt groups but
* not lines. This example shows how to register an interrupt through the INTC
* driver, which manages lines. If interrupt request lines do not have to be
* handled separately within groups, then the IAR built-in event handling
* mechanism can be used in this way:
* - remove the INTC driver files (intc.c and exception.s82) from the IAR
* project;
* - remove calls to the INTC driver functions (\ref INTC_init_interrupts and
* \ref INTC_register_interrupt);
* - add <tt>\#pragma handler = \e AVR32_xxxx_IRQ_GROUP, \e int_level</tt>
* above the \c __interrupt keyword;
* - the IAR project options can be changed to catch unhandled events under
* the \e Runtime tab of the <i>General Options</i> item.
*
* \warning The IAR built-in event handling mechanism
* (<tt>\#pragma exception</tt> and <tt>\#pragma handler</tt>) MUST NOT
* be used along with the INTC driver within a project.
*
* \section files Main Files
* - intc.c: interrupt controller driver;
* - intc.h: interrupt controller driver header file;
* - exception.S: exception and interrupt handlers assembly file for GCC;
* - interrupt_usart_example.c: interrupt controller example application.
*
* \section compilinfo Compilation Information
* This software is written for GNU GCC for AVR32 and for IAR Embedded Workbench
* for Atmel AVR32. Other compilers may or may not work.
*
* \section deviceinfo Device Information
* All AVR32 devices with an INTC and a USART module can be used.
*
* \section configinfo Configuration Information
* This example has been tested with the following configuration:
* - EVK1100, EVK1101, EVK1103, EVK1104, EVK1105, AT32UC3L-EK evaluation kits; STK600+RCUC3L routing card
* - CPU clock:
* -- 12 MHz : EVK1100, EVK1101, EVK1104, EVK1105, AT32UC3L-EK evaluation kits; STK600+RCUC3L routing card;
* -- 16 Mhz : UC3C_EK
* - USART0 (on EVK1100) or USART1 (on EVK1101 or STK1000) connected to a PC
* serial port via a standard RS232 DB9 cable, or USART0 (on EVK1105) or
* USART1 (on EVK1104) or USART2 (on EVK1103) or USART3 (on AT32UC3L-EK) abstracted
* with a USB CDC connection to a PC;
* - PC terminal settings:
* - 57600 bps (on EVK1100, EVK1101, AT32UC3C-EK, EVK1104, EVK1105, AT32UC3L-EK) or 115200 bps (on
* STK1000),
* - 8 data bits,
* - no parity bit,
* - 1 stop bit,
* - no flow control.
*
* \section contactinfo Contact Information
* For further information, visit
* <A href="http://www.atmel.com/products/AVR32/">Atmel AVR32</A>.\n
* Support and FAQ: http://support.atmel.no/
*/
#include <avr32/io.h>
#include "compiler.h"
#include "board.h"
#include "print_funcs.h"
#include "intc.h"
#if defined (__GNUC__)
# if defined (__AVR32_AP7000__)
# include "pm_at32ap7000.h"
# else
# include "power_clocks_lib.h"
# endif
#elif defined (__ICCAVR32__) || defined (__AAVR32__)
# if defined (__AT32AP7000__)
# include "pm_at32ap7000.h"
# else
# include "power_clocks_lib.h"
# endif
#endif
#include "gpio.h"
#include "usart.h"
/*! \name USART Settings
*/
//! @{
#if BOARD == EVK1100
# define EXAMPLE_USART (&AVR32_USART0)
# define EXAMPLE_USART_RX_PIN AVR32_USART0_RXD_0_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART0_RXD_0_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART0_TXD_0_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART0_TXD_0_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART0_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == EVK1101
# define EXAMPLE_USART (&AVR32_USART1)
# define EXAMPLE_USART_RX_PIN AVR32_USART1_RXD_0_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART1_RXD_0_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART1_TXD_0_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART1_TXD_0_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART1_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == UC3C_EK
# define EXAMPLE_USART (&AVR32_USART2)
# define EXAMPLE_USART_RX_PIN AVR32_USART2_RXD_0_1_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART2_RXD_0_1_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART2_TXD_0_1_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART2_TXD_0_1_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART2_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == EVK1104
# define EXAMPLE_USART (&AVR32_USART1)
# define EXAMPLE_USART_RX_PIN AVR32_USART1_RXD_0_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART1_RXD_0_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART1_TXD_0_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART1_TXD_0_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART1_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == EVK1105
# define EXAMPLE_USART (&AVR32_USART0)
# define EXAMPLE_USART_RX_PIN AVR32_USART0_RXD_0_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART0_RXD_0_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART0_TXD_0_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART0_TXD_0_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART0_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == STK1000
# define EXAMPLE_USART (&AVR32_USART1)
# define EXAMPLE_USART_RX_PIN AVR32_USART1_RXD_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART1_RXD_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART1_TXD_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART1_TXD_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART1_IRQ
# define EXAMPLE_USART_BAUDRATE 115200
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == NGW100
# define EXAMPLE_USART (&AVR32_USART1)
# define EXAMPLE_USART_RX_PIN AVR32_USART1_RXD_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART1_RXD_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART1_TXD_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART1_TXD_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART1_IRQ
# define EXAMPLE_USART_BAUDRATE 115200
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == STK600_RCUC3L0
# define EXAMPLE_USART (&AVR32_USART1)
# define EXAMPLE_USART_RX_PIN AVR32_USART1_RXD_0_1_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART1_RXD_0_1_FUNCTION
// For the RX pin, connect STK600.PORTE.PE3 to STK600.RS232 SPARE.RXD
# define EXAMPLE_USART_TX_PIN AVR32_USART1_TXD_0_1_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART1_TXD_0_1_FUNCTION
// For the TX pin, connect STK600.PORTE.PE2 to STK600.RS232 SPARE.TXD
# define EXAMPLE_USART_IRQ AVR32_USART1_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ FOSC0 // PBA clock target frequency, in Hz
#elif BOARD == UC3L_EK
# define EXAMPLE_USART (&AVR32_USART3)
# define EXAMPLE_USART_RX_PIN AVR32_USART3_RXD_0_0_PIN
# define EXAMPLE_USART_RX_FUNCTION AVR32_USART3_RXD_0_0_FUNCTION
# define EXAMPLE_USART_TX_PIN AVR32_USART3_TXD_0_0_PIN
# define EXAMPLE_USART_TX_FUNCTION AVR32_USART3_TXD_0_0_FUNCTION
# define EXAMPLE_USART_IRQ AVR32_USART3_IRQ
# define EXAMPLE_USART_BAUDRATE 57600
# define EXAMPLE_TARGET_DFLL_FREQ_HZ 96000000 // DFLL target frequency, in Hz
# define EXAMPLE_TARGET_MCUCLK_FREQ_HZ 12000000 // MCU clock target frequency, in Hz
# undef EXAMPLE_TARGET_PBACLK_FREQ_HZ
# define EXAMPLE_TARGET_PBACLK_FREQ_HZ 12000000 // PBA clock target frequency, in Hz
/*! \name Parameters to pcl_configure_clocks().
*/
//! @{
static scif_gclk_opt_t gc_dfllif_ref_opt = { SCIF_GCCTRL_SLOWCLOCK, 0, OFF };
static pcl_freq_param_t pcl_dfll_freq_param =
{
.main_clk_src = PCL_MC_DFLL0,
.cpu_f = EXAMPLE_TARGET_MCUCLK_FREQ_HZ,
.pba_f = EXAMPLE_TARGET_PBACLK_FREQ_HZ,
.pbb_f = EXAMPLE_TARGET_PBACLK_FREQ_HZ,
.dfll_f = EXAMPLE_TARGET_DFLL_FREQ_HZ,
.pextra_params = &gc_dfllif_ref_opt
};
//! @}
#endif
//! @}
/*! \brief The USART interrupt handler.
*
* \note The `__attribute__((__interrupt__))' (under GNU GCC for AVR32) and
* `__interrupt' (under IAR Embedded Workbench for Atmel AVR32) C function
* attributes are used to manage the `rete' instruction.
*/
#if defined (__GNUC__)
__attribute__((__interrupt__))
#elif defined(__ICCAVR32__)
__interrupt
#endif
static void usart_int_handler(void)
{
int c;
// In the code line below, the interrupt priority level does not need to be
// explicitly masked as it is already because we are within the interrupt
// handler.
// The USART Rx interrupt flag is cleared by side effect when reading the
// received character.
// Waiting until the interrupt has actually been cleared is here useless as
// the call to usart_write_char will take enough time for this before the
// interrupt handler is leaved and the interrupt priority level is unmasked by
// the CPU.
usart_read_char(EXAMPLE_USART, &c);
// Print the received character to USART.
// It is a simple echo, so there will be no translation of '\r' to "\r\n". The
// connected terminal has to be configured accordingly to send '\n' after
// '\r'.
usart_write_char(EXAMPLE_USART, c);
}
/*! \brief The main function.
*
* It sets up the USART module on EXAMPLE_USART. The terminal settings are 57600
* 8N1.
* Then it sets up the interrupt handler and waits for a USART interrupt to
* trigger.
*/
int main(void)
{
static const gpio_map_t USART_GPIO_MAP =
{
{EXAMPLE_USART_RX_PIN, EXAMPLE_USART_RX_FUNCTION},
{EXAMPLE_USART_TX_PIN, EXAMPLE_USART_TX_FUNCTION}
};
// USART options.
static const usart_options_t USART_OPTIONS =
{
.baudrate = EXAMPLE_USART_BAUDRATE,
.charlength = 8,
.paritytype = USART_NO_PARITY,
.stopbits = USART_1_STOPBIT,
.channelmode = USART_NORMAL_CHMODE
};
#if BOARD == EVK1100 || BOARD == EVK1101 || BOARD == UC3C_EK || BOARD == EVK1104 || BOARD == EVK1105 || BOARD == STK600_RCUC3L0
// Configure Osc0 in crystal mode (i.e. use of an external crystal source, with
// frequency FOSC0) with an appropriate startup time then switch the main clock
// source to Osc0.
pcl_switch_to_osc(PCL_OSC0, FOSC0, OSC0_STARTUP);
#elif BOARD == STK1000
pm_reset();
#elif BOARD == UC3L_EK
// Note: on the AT32UC3L-EK board, there is no crystal/external clock connected
// to the OSC0 pinout XIN0/XOUT0. We shall then program the DFLL and switch the
// main clock source to the DFLL.
pcl_configure_clocks(&pcl_dfll_freq_param);
// Note: since it is dynamically computing the appropriate field values of the
// configuration registers from the parameters structure, this function is not
// optimal in terms of code size. For a code size optimal solution, it is better
// to create a new function from pcl_configure_clocks_dfll0() and modify it
// to use preprocessor computation from pre-defined target frequencies.
#endif
// Assign GPIO to USART.
gpio_enable_module(USART_GPIO_MAP,
sizeof(USART_GPIO_MAP) / sizeof(USART_GPIO_MAP[0]));
// Initialize USART in RS232 mode.
usart_init_rs232(EXAMPLE_USART, &USART_OPTIONS, EXAMPLE_TARGET_PBACLK_FREQ_HZ);
print(EXAMPLE_USART, ".: Using interrupts with the USART :.\n\n");
// Disable all interrupts.
Disable_global_interrupt();
// Initialize interrupt vectors.
INTC_init_interrupts();
// Register the USART interrupt handler to the interrupt controller.
// usart_int_handler is the interrupt handler to register.
// EXAMPLE_USART_IRQ is the IRQ of the interrupt handler to register.
// AVR32_INTC_INT0 is the interrupt priority level to assign to the group of
// this IRQ.
// void INTC_register_interrupt(__int_handler handler, unsigned int irq, unsigned int int_level);
INTC_register_interrupt(&usart_int_handler, EXAMPLE_USART_IRQ, AVR32_INTC_INT0);
// Enable USART Rx interrupt.
EXAMPLE_USART->ier = AVR32_USART_IER_RXRDY_MASK;
print(EXAMPLE_USART, "Type a character to use the interrupt handler.\n"
"It will show up on your screen.\n\n");
// Enable all interrupts.
Enable_global_interrupt();
// We have nothing left to do in the main, so we may switch to a device sleep
// mode: we just need to be sure that the USART module will be still be active
// in the chosen sleep mode. The sleep mode to use is the FROZEN sleep mode:
// in this mode the PB clocks are still active (so the USART module which is
// on the Peripheral Bus will still be active while the CPU and HSB will be
// stopped).
// --
// Modules communicating with external circuits should normally be disabled
// before entering a sleep mode that will stop the module operation: this is not
// the case for the FROZEN sleep mode.
// --
// When the USART interrupt occurs, this will wake the CPU up which will then
// execute the interrupt handler code then come back to the while(1) loop below
// to execute the sleep instruction again.
while(1)
{
// If there is a chance that any PB write operations are incomplete, the CPU
// should perform a read operation from any register on the PB bus before
// executing the sleep instruction.
AVR32_INTC.ipr[0]; // Dummy read
// Go to FROZEN sleep mode.
SLEEP(AVR32_PM_SMODE_FROZEN);
// When the device wakes up due to an interrupt, once the interrupt is serviced,
// go back into FROZEN sleep mode.
}
}
它启用了我的 USART 以及中断，但我不断收到中断，而没有来自其他模块的任何数据传输。有人告诉我该usart_read_char()函数将清除中断状态位。
如果有人在这里指导我会很好。有没有人有 UART 的工作示例代码？