twis_example.c File Reference

#include "print_funcs.h"
#include "board.h"
#include "power_clocks_lib.h"
#include "twis.h"
#include "gpio.h"
#include <stdint.h>
#include <stdio.h>

Macros
System Clock Frequencies
Information about Clock configuration and TWIM Module configuration
#define	DFLL_FREQ_HZ   96000000
TWIM Module Configuration
Information about TWIM Module
#define	TWIS   (&AVR32_TWIS0)
#define	SLAVE_ADDRESS   0x05
#define	SLAVE_ADDR_LGT   3
#define	VIRTUALMEM_ADDR_START   0x123456
#define	TWI_SPEED   50000
Virtual Memory Management
Defines to manage a virtual TWI memory
#define	TWI_MEM_SIZE   20
#define	TWI_MEM_IDLE   0
#define	TWI_MEM_ADDR   1
#define	TWI_MEM_DATA   2

Functions
void	twis_slave_rx (uint8_t u8_value)
	Manage the received data on TWI. More...
uint8_t	twis_slave_tx (void)
	Transmit a data on TWIS. More...
void	twis_slave_stop ()
	Manage stop transfer reception on TWIS. More...
static void	init_sys_clocks (void)
	Initializes the MCU system clocks. More...
void	twis_init (void)
	TWIS interface initialization. More...
int	main (void)
	Main function. More...

Variables
uint8_t	s_memory [TWI_MEM_SIZE] = { 0 }
	Content of the Virtual mem. More...
uint8_t	s_status_cmd = TWI_MEM_IDLE
	State variable. More...
uint32_t	s_u32_addr
	The current address in the virtual mem. More...
uint8_t	s_u8_addr_pos
	Offset in the address value (because we receive the address one Byte at a time) More...

System Clock Frequencies
Information about Clock configuration and TWIM Module configuration
#define	FCPU_HZ   12000000
#define	FPBA_HZ   12000000
#define	TEST_TWIS_TWCK_PIN   AVR32_TWIMS0_TWCK_0_0_PIN
#define	TEST_TWIS_TWCK_FUNCTION   AVR32_TWIMS0_TWCK_0_0_FUNCTION
#define	TEST_TWIS_TWD_PIN   AVR32_TWIMS0_TWD_0_2_PIN
#define	TEST_TWIS_TWD_FUNCTION   AVR32_TWIMS0_TWD_0_2_FUNCTION
static scif_gclk_opt_t	gc_dfllif_ref_opt = { SCIF_GCCTRL_SLOWCLOCK, 0, false}
static pcl_freq_param_t	pcl_freq_param

#define DFLL_FREQ_HZ   96000000

#define FCPU_HZ   12000000

#define FPBA_HZ   12000000

#define SLAVE_ADDR_LGT   3

#define SLAVE_ADDRESS   0x05

#define TEST_TWIS_TWCK_FUNCTION   AVR32_TWIMS0_TWCK_0_0_FUNCTION

#define TEST_TWIS_TWCK_PIN   AVR32_TWIMS0_TWCK_0_0_PIN

#define TEST_TWIS_TWD_FUNCTION   AVR32_TWIMS0_TWD_0_2_FUNCTION

#define TEST_TWIS_TWD_PIN   AVR32_TWIMS0_TWD_0_2_PIN

PIN 1 & 2 in Header J44 can be used in UC3L_EK

#define TWI_MEM_ADDR   1

#define TWI_MEM_DATA   2

#define TWI_MEM_IDLE   0

#define TWI_MEM_SIZE   20

#define TWI_SPEED   50000

#define TWIS   (&AVR32_TWIS0)

#define VIRTUALMEM_ADDR_START   0x123456

static void init_sys_clocks ( void  )

static

Initializes the MCU system clocks.

Remarks

System clock configuration

int main

(

void

)

Main function.

Remarks

Main Function

void twis_init

(

void

)

TWIS interface initialization.

Remarks

TWIS Module Configuration

For UC3L devices, TWI default pins are, TWIMS0 -> PB05,PA21 TWIMS1 -> PB04 To enable TWI clock/data in another pin, these have to be assigned to other peripherals or as GPIO.

void twis_slave_rx

(

uint8_t

u8_value

)

Manage the received data on TWI.

Remarks

User defined operations after reception

void twis_slave_stop

(

)

Manage stop transfer reception on TWIS.

Remarks

User defined operations on Stop condition

uint8_t twis_slave_tx

(

void

)

Transmit a data on TWIS.

Remarks

User defined operations during transmission

scif_gclk_opt_t gc_dfllif_ref_opt = { SCIF_GCCTRL_SLOWCLOCK, 0, false}

static

pcl_freq_param_t pcl_freq_param

static

Initial value:

=
{
    .main_clk_src  = PCL_MC_DFLL0,
    .cpu_f         = FCPU_HZ,
    .pba_f         = FPBA_HZ,
    .dfll_f        = DFLL_FREQ_HZ,
    .pextra_params = &gc_dfllif_ref_opt
}

uint8_t s_memory[TWI_MEM_SIZE] = { 0 }

Content of the Virtual mem.

uint8_t s_status_cmd = TWI_MEM_IDLE

State variable.

uint32_t s_u32_addr

The current address in the virtual mem.

uint8_t s_u8_addr_pos

Offset in the address value (because we receive the address one Byte at a time)