uint8_t Init_Twi(int index)
{
if(index > (sizeof(twi_instances)/sizeof(twi_instances[0])))
{
return 0;
}
if(twi_Init[index] == 1)
{
return 1; // allready initialized.
}
freertos_peripheral_options_t async_driver_options = {
NULL,
0,
(configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY + 1),
TWI_I2C_MASTER,
(USE_TX_ACCESS_MUTEX | USE_RX_ACCESS_MUTEX | WAIT_TX_COMPLETE | WAIT_RX_COMPLETE),
};
/*Initialize twi bus.*/
freertos_twi_if twi = freertos_twi_master_init( twi_instances[index],
&async_driver_options );
if ( twi == NULL )
{
return 0;
}
freeRTOS_twi[index] = twi;
twi_set_speed( twi_instances[index], 400000, sysclk_get_cpu_hz() ); /*High speed TWI setting*/
twi_Init[index] = 1;
return 1;
}
/**
* \brief Initialize TWI master mode.
*
* \param p_twi Pointer to a TWI instance.
* \param p_opt Options for initializing the TWI module (see \ref twi_options_t).
*
* \return TWI_SUCCESS if initialization is complete, error code otherwise.
*/
uint32_t twi_master_init(Twi *p_twi, const twi_options_t *p_opt)
{
uint32_t status = TWI_SUCCESS;
/* Disable TWI interrupts */
p_twi->TWI_IDR = ~0UL;
/* Dummy read in status register */
p_twi->TWI_SR;
/* Reset TWI peripheral */
twi_reset(p_twi);
twi_enable_master_mode(p_twi);
/* Select the speed */
if (twi_set_speed(p_twi, p_opt->speed, p_opt->master_clk) == FAIL) {
/* The desired speed setting is rejected */
status = TWI_INVALID_ARGUMENT;
}
if (p_opt->smbus == 1) {
p_twi->TWI_CR = TWI_CR_QUICK;
}
return status;
}
int twi_master_init(volatile avr32_twi_t *twi, const twi_options_t *opt)
{
irqflags_t flags = sysreg_read(AVR32_SR);
int status = TWI_SUCCESS;
// Set pointer to TWIM instance for IT
twi_inst = twi;
// Disable TWI interrupts
cpu_irq_disable();
twi->idr = ~0UL;
twi->sr;
// Reset TWI
twi->cr = AVR32_TWI_CR_SWRST_MASK;
cpu_irq_restore(flags);
// Dummy read in SR
twi->sr;
// register Register twim_master_interrupt_handler interrupt
// on level CONF_TWI_IRQ_LEVEL
flags = cpu_irq_save();
irq_register_handler(&twi_master_interrupt_handler, CONF_TWI_IRQ_LINE,
CONF_TWI_IRQ_LEVEL);
cpu_irq_restore(flags);
// Select the speed
twi_set_speed(twi, opt->speed, opt->pba_hz);
// Probe the component
//status = twi_probe(twi, opt->chip);
return status;
}
static uint8_t twi_init(void){
freertos_peripheral_options_t driver_options = {
//Receiver Buffer
NULL,
//Size Receiver Buffer
0,
//Priority Interrupt
(configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY),
TWI_I2C_MASTER,
( USE_TX_ACCESS_MUTEX | USE_RX_ACCESS_MUTEX | WAIT_TX_COMPLETE | WAIT_RX_COMPLETE)
};
freertos_twi = freertos_twi_master_init(TWI0, &driver_options);
configASSERT(freertos_twi);
uint8_t twi_flag = twi_set_speed(TWI0, TWI_SPEED, sysclk_get_cpu_hz());
return twi_flag;
}
int twi_master_init(volatile avr32_twim_t *twi, const twi_options_t *opt) {
bool global_interrupt_enabled = Is_global_interrupt_enabled();
int status = TWI_SUCCESS;
// Disable TWI interrupts
if (global_interrupt_enabled) Disable_global_interrupt();
twi->idr = ~0UL;
// Reset TWI
twi->cr = AVR32_TWIM_CR_SWRST_MASK;
if (global_interrupt_enabled) Enable_global_interrupt();
// Clear SR
twi->scr = ~0UL;
// Disable all interrupts
Disable_global_interrupt();
// Register TWI handler on level 2
BSP_INTC_IntReg( &twi_master_interrupt_handler, AVR32_TWIM0_IRQ, AVR32_INTC_INT1);
// Enable all interrupts
Enable_global_interrupt();
twi->cr = AVR32_TWIM_CR_MEN_MASK;
if (opt->smbus) {
twi->cr = AVR32_TWIM_CR_SMEN_MASK;
twi->smbtr = (unsigned long) -1;
}
// Select the speed
if (twi_set_speed(twi, opt->speed, opt->pba_hz) == TWI_INVALID_CLOCK_DIV)
return TWI_INVALID_CLOCK_DIV;
// Probe the component
//status = twi_probe(twi, opt->chip);
return status;
}
int twi_master_init(volatile avr32_twi_t *twi, const twi_options_t *opt)
{
bool global_interrupt_enabled = Is_global_interrupt_enabled();
int status = TWI_SUCCESS;
// Set pointer to TWIM instance for IT
twi_inst = twi;
// Disable TWI interrupts
if (global_interrupt_enabled) Disable_global_interrupt();
twi->idr = ~0UL;
twi->sr;
// Reset TWI
twi->cr = AVR32_TWI_CR_SWRST_MASK;
if (global_interrupt_enabled) Enable_global_interrupt();
// Dummy read in SR
twi->sr;
// Disable all interrupts
Disable_global_interrupt();
// Register TWI handler on level 2
INTC_register_interrupt( &twi_master_interrupt_handler, AVR32_TWI_IRQ, AVR32_INTC_INT1);
// Enable all interrupts
Enable_global_interrupt();
// Select the speed
twi_set_speed(twi, opt->speed, opt->pba_hz);
// Probe the component
//status = twi_probe(twi, opt->chip);
return status;
}
