rt-thread/bsp/avr32uc3b0/board.c

/*
 * File      : board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2010, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2010-03-30     Kyle         First version
 */

#include <rtthread.h>
#include "compiler.h"
#include "pm.h"
#include "gpio.h"
#include "usart.h"
#include "intc.h"
#include "serial.h"

#define FOSC0	12000000
#define FCPU	60000000
#define FHSB	FCPU
#define FPBA	FCPU
#define FPBB	FCPU

extern void rt_hw_serial_isr(void);
extern void rt_hw_usart_init(void);

/**
 * System tick interrupt handler.
 */
static void rt_hw_timer_handler(void)
{
	// Clears the interrupt request.
	Set_system_register(AVR32_COMPARE, FCPU / RT_TICK_PER_SECOND);

	rt_tick_increase();
}

/**
 * Initialize system clock and all peripherals.
 */
static void peripherals_init(void)
{
	/*
	 * PM initialization: OSC0 = 12MHz XTAL, PLL0 = 60MHz System Clock
	 */
	pm_freq_param_t pm_freq_param =
	{
		.cpu_f = FCPU,
		.pba_f = FPBA,
		.osc0_f = FOSC0,
		.osc0_startup = AVR32_PM_OSCCTRL0_STARTUP_2048_RCOSC
	};
	pm_configure_clocks(&pm_freq_param);

	/*
	 * USART1 initialization
	 */
	gpio_enable_module_pin(AVR32_USART1_TXD_0_1_PIN, AVR32_USART1_TXD_0_1_FUNCTION);
	gpio_enable_module_pin(AVR32_USART1_RXD_0_1_PIN, AVR32_USART1_RXD_0_1_FUNCTION);
	static const usart_options_t usartOptions = {
		.baudrate = 115200,
		.charlength = 8,
		.paritytype = USART_NO_PARITY,
		.stopbits = USART_1_STOPBIT,
		.channelmode = USART_NORMAL_CHMODE
	};
	usart_init_rs232(&AVR32_USART1, &usartOptions, FCPU);

	INTC_init_interrupts();
	INTC_register_interrupt(&rt_hw_serial_isr, AVR32_USART1_IRQ, AVR32_INTC_INT0);
	AVR32_USART1.ier = AVR32_USART_IER_RXRDY_MASK;
}

/**
 * Initialize CPU cycle counter for system tick.
 */
static void cpu_counter_init(void)
{
	INTC_register_interrupt(&rt_hw_timer_handler, AVR32_CORE_COMPARE_IRQ, AVR32_INTC_INT3);
	Set_system_register(AVR32_COMPARE, FCPU / RT_TICK_PER_SECOND);
	Set_system_register(AVR32_COUNT, 0);
}

void rt_hw_board_init(void)
{
	extern struct rt_device _rt_usart_device;
	extern struct avr32_serial_device uart;

	Disable_global_interrupt();

	peripherals_init();
	cpu_counter_init();

	rt_hw_serial_register(&_rt_usart_device, "uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM, &uart);
	rt_console_set_device("uart1");
}