sau_example.c File Reference

Example of usage of the Software Framework SAU driver in AVR UC3.

Copyright (c) 2012-2018 Microchip Technology Inc. and its subsidiaries.

#include <avr32/io.h>
#include "compiler.h"
#include "print_funcs.h"
#include "gpio.h"
#include "mpu.h"
#include "sau.h"
#include "cycle_counter.h"
#include "usart.h"
#include "intc.h"
#include "power_clocks_lib.h"
#include "sysclk.h"

Macros
#define	EXAMPLE_SAU_SLAVE_USART   AVR32_USART3_ADDRESS
#define	EXAMPLE_TARGET_PBACLK_FREQ_HZ   15000000
#define	EXAMPLE_UNLOCK_CLOCK_CYCLES   200
#define	EXAMPLE_UNLOCK_KEY   0x55
#define	EXAMPLE_WRONG_UNLOCK_KEY   0x66
#define	HSB_PBA_START_ADDR   0XFFFF0000
#define	HSB_PBB_START_ADDR   0XFFFE0000
#define	NB_CONFIG_MPU_ENTRIES   5
#define	PRINT_EXAMPLE_CHAR   0x41
#define	REGION_0_FLASH_INDEX   0
#define	REGION_1_STACK_INDEX   1
#define	REGION_2_PERIPHERALS_INDEX   2
#define	REGION_3_SAU_HSB_INDEX   3
#define	REGION_4_SAU_INDEX   4
#define	USART_CSR_CHANNEL   0
#define	USART_RHR_CHANNEL   2
#define	USART_THR_CHANNEL   1

Functions
void	attempt_read_UR (void)
void	handle_exception (unsigned int *sp, unsigned long exception_address, unsigned int exception_cause)
	Handle exception; called by the _evba assembly function. More...
static void	led_display_chaser_infinitely (void)
	Toggle the LED0 and LED1 infinitely. More...
static void	leds_toggle_infinitely (void)
	Toggle the LEDs infinitely. More...
void	main (void)
void	mpu_memory_protect_config (void)
	MPU configuration in this example. More...
void	sau_config_to_usart (void)
	SAU configuration for USART registers. More...
static void	sau_int_handler (void)
	The SAU interrupt handler. More...
bool	sau_usart_tx_ready ()

Variables
mpu_entry_t	dmpu_entries [NB_CONFIG_MPU_ENTRIES]

#define EXAMPLE_SAU_SLAVE_USART   AVR32_USART3_ADDRESS

Referenced by sau_config_to_usart().

#define EXAMPLE_TARGET_PBACLK_FREQ_HZ   15000000

Referenced by main().

#define EXAMPLE_UNLOCK_CLOCK_CYCLES   200

Referenced by main().

#define EXAMPLE_UNLOCK_KEY   0x55

Referenced by main().

#define EXAMPLE_WRONG_UNLOCK_KEY   0x66

Referenced by main().

#define HSB_PBA_START_ADDR   0XFFFF0000

Referenced by mpu_memory_protect_config().

#define HSB_PBB_START_ADDR   0XFFFE0000

Referenced by mpu_memory_protect_config().

#define NB_CONFIG_MPU_ENTRIES   5

#define PRINT_EXAMPLE_CHAR   0x41

Referenced by main().

#define REGION_0_FLASH_INDEX   0

Referenced by mpu_memory_protect_config().

#define REGION_1_STACK_INDEX   1

Referenced by mpu_memory_protect_config().

#define REGION_2_PERIPHERALS_INDEX   2

Referenced by mpu_memory_protect_config().

#define REGION_3_SAU_HSB_INDEX   3

Referenced by mpu_memory_protect_config().

#define REGION_4_SAU_INDEX   4

Referenced by mpu_memory_protect_config().

#define USART_CSR_CHANNEL   0

Referenced by main(), sau_config_to_usart(), and sau_usart_tx_ready().

#define USART_RHR_CHANNEL   2

Referenced by sau_config_to_usart().

#define USART_THR_CHANNEL   1

Referenced by main(), and sau_config_to_usart().

void attempt_read_UR

(

void

)

Referenced by main().

void handle_exception	(	unsigned int *	sp,
		unsigned long	exception_address,
		unsigned int	exception_cause
	)

Handle exception; called by the _evba assembly function.

AVR32_EVBA_OFFSET_ITLB_PROT AVR32_EVBA_OFFSET_DTLB_PROT_x

Parameters

*sp	pointer to stack before the exception (provided through R12). At this point, sp[0]=SR, sp[1]=PC.
exception_address	address of the offending instruction
exception_cause	exception cause(==(EVBA offset of the exception)>>2)

References disable_mpu().

static void led_display_chaser_infinitely ( void  )

static

Toggle the LED0 and LED1 infinitely.

Note

This is used to show the end of this demo.

References i, and max.

Referenced by main().

static void leds_toggle_infinitely ( void  )

static

Toggle the LEDs infinitely.

Note

This is used to show errors in case of any MPU configuration.

References i.

Referenced by mpu_memory_protect_config().

void main

(

void

)

References attempt_read_UR(), Enable_global_exception, Enable_global_interrupt, EXAMPLE_TARGET_PBACLK_FREQ_HZ, EXAMPLE_UNLOCK_CLOCK_CYCLES, EXAMPLE_UNLOCK_KEY, EXAMPLE_WRONG_UNLOCK_KEY, gpio_set_gpio_pin(), init_dbg_rs232(), INTC_register_interrupt(), led_display_chaser_infinitely(), mpu_memory_protect_config(), print_dbg(), PRINT_EXAMPLE_CHAR, sau_clear_error_flags, sau_config_to_usart(), sau_disable_buserr_resp, sau_disable_interrupt, sau_enable_buserr_resp, sau_enable_interrupt, sau_enable_open_mode, sau_int_handler(), sau_lock_channels(), sau_status_check, sau_unlock_channel(), sau_usart_tx_ready(), sau_write_channel(), sysclk_init(), USART_CSR_CHANNEL, and USART_THR_CHANNEL.

void mpu_memory_protect_config

(

void

)

MPU configuration in this example.

References mpu_entry_t::addr, enable_mpu(), HSB_PBA_START_ADDR, HSB_PBB_START_ADDR, leds_toggle_infinitely(), MPU_APRA_ID, MPU_APRB_ID, mpu_convert_kbsize_to_eregionsize(), MPU_PRIVR_UNPRIVNONE, MPU_PRIVRW_UNPRIVNONE, MPU_PRIVRX_UNPRIVRX, MPU_REGION_SIZE_32KB, MPU_REGION_SIZE_64KB, print_dbg(), REGION_0_FLASH_INDEX, REGION_1_STACK_INDEX, REGION_2_PERIPHERALS_INDEX, REGION_3_SAU_HSB_INDEX, REGION_4_SAU_INDEX, select_subregion(), set_access_permissions(), set_mpu_entry(), mpu_entry_t::size, and mpu_entry_t::valid.

Referenced by main().

void sau_config_to_usart

(

void

)

SAU configuration for USART registers.

References EXAMPLE_SAU_SLAVE_USART, sau_configure_channels(), sau_enable, sau_enter_setup, USART_CSR_CHANNEL, USART_RHR_CHANNEL, and USART_THR_CHANNEL.

Referenced by main().

static void sau_int_handler ( void  )

static

The SAU 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.

References print_dbg(), sau_clear_error_flags, and sau_status_check.

Referenced by main().

bool sau_usart_tx_ready

(

)

References sau_read_channel(), and USART_CSR_CHANNEL.

Referenced by main().

mpu_entry_t dmpu_entries[NB_CONFIG_MPU_ENTRIES]