/**
* \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;
}
static always_inline void twi_init(void)
{
#if defined(USIPP)
#if defined(USI_ON_PORT_A)
USIPP |= _BV(USIPOS);
#else
USIPP &= ~_BV(USIPOS);
# endif
#endif
twi_reset();
}
/**
* \brief Initialize TWI slave mode.
*
* \param p_twi Pointer to a TWI instance.
* \param ul_device_addr Device address of the SAM slave device on the I2C bus.
*/
void twi_slave_init(Twi *p_twi, uint32_t ul_device_addr)
{
/* Disable TWI interrupts */
p_twi->TWI_IDR = ~0UL;
p_twi->TWI_SR;
/* Reset TWI */
twi_reset(p_twi);
/* Set slave address in slave mode */
p_twi->TWI_SMR = TWI_SMR_SADR(ul_device_addr);
/* Enable slave mode */
twi_enable_slave_mode(p_twi);
}
/**
* \ingroup freertos_twi_peripheral_control_group
* \brief Initializes the FreeRTOS ASF TWI (I2C) master driver for the specified
* TWI port.
*
* freertos_twi_master_init() is an ASF specific FreeRTOS driver function. It
* must be called before any other ASF specific FreeRTOS driver functions
* attempt to access the same TWI port.
*
* If freertos_driver_parameters->operation_mode equals TWI_I2C_MASTER then
* freertos_twi_master_init() will configure the TWI port for master mode
* operation and enable the peripheral. If
* freertos_driver_parameters->operation_mode equals any other value then
* freertos_twi_master_init() will not take any action.
*
* Other ASF TWI functions can be called after freertos_twi_master_init() has
* completed successfully.
*
* The FreeRTOS ASF driver both installs and handles the TWI PDC interrupts.
* Users do not need to concern themselves with interrupt handling, and must
* not install their own interrupt handler.
*
* This driver is provided with an application note, and an example project that
* demonstrates the use of this function.
*
* \param p_twi The twi peripheral being initialized.
* \param freertos_driver_parameters Defines the driver behavior. See the
* freertos_peripheral_options_t documentation, and the application note that
* accompanies the ASF specific FreeRTOS functions.
*
* \return If the initialization completes successfully then a handle that can
* be used with FreeRTOS TWI read and write functions is returned. If
* the initialisation fails then NULL is returned.
*/
freertos_twi_if freertos_twi_master_init(Twi *p_twi,
const freertos_peripheral_options_t *const freertos_driver_parameters)
{
portBASE_TYPE twi_index;
bool is_valid_operating_mode;
freertos_twi_if return_value;
const enum peripheral_operation_mode valid_operating_modes[] = {TWI_I2C_MASTER};
/* Find the index into the all_twi_definitions array that holds details of
the p_twi peripheral. */
twi_index = get_pdc_peripheral_details(all_twi_definitions, MAX_TWIS,
(void *) p_twi);
/* Check the requested operating mode is valid for the peripheral. */
is_valid_operating_mode = check_requested_operating_mode(
freertos_driver_parameters->operation_mode,
valid_operating_modes,
sizeof(valid_operating_modes) /
sizeof(enum peripheral_operation_mode));
/* Don't do anything unless a valid p_twi pointer was used, and a valid
operating mode was requested. */
if ((twi_index < MAX_TWIS) && (is_valid_operating_mode == true)) {
/* This function must be called exactly once per supported twi. Check
it has not been called before. */
configASSERT(memcmp((void *)&(tx_dma_control[twi_index]),
&null_dma_control,
sizeof(null_dma_control)) == 0);
configASSERT(memcmp((void *)&(rx_dma_control[twi_index]),
&null_dma_control,
sizeof(null_dma_control)) == 0);
/* Enable the peripheral's clock. */
pmc_enable_periph_clk(
all_twi_definitions[twi_index].peripheral_id);
/* Ensure everything is disabled before configuration. */
pdc_disable_transfer(
all_twi_definitions[twi_index].pdc_base_address,
(PERIPH_PTCR_RXTDIS | PERIPH_PTCR_TXTDIS));
twi_disable_interrupt(
all_twi_definitions[twi_index].peripheral_base_address,
MASK_ALL_INTERRUPTS);
twi_reset(
all_twi_definitions[twi_index].peripheral_base_address);
switch (freertos_driver_parameters->operation_mode) {
case TWI_I2C_MASTER:
/* Call the standard ASF init function. */
twi_enable_master_mode(
all_twi_definitions[twi_index].peripheral_base_address);
break;
default:
/* No other modes are currently supported. */
break;
}
/* Create any required peripheral access mutexes and transaction complete
semaphores. This peripheral is half duplex so only a single access
mutex is required. */
create_peripheral_control_semaphores(
freertos_driver_parameters->options_flags,
&(tx_dma_control[twi_index]),
&(rx_dma_control[twi_index]));
/* Error interrupts are always enabled. */
twi_enable_interrupt(
all_twi_definitions[twi_index].peripheral_base_address,
IER_ERROR_INTERRUPTS);
/* Configure and enable the TWI interrupt in the interrupt controller. */
configure_interrupt_controller(
all_twi_definitions[twi_index].peripheral_irq,
freertos_driver_parameters->interrupt_priority);
return_value = (freertos_twi_if) p_twi;
} else {
return_value = NULL;
}
return return_value;
}
void usi_twi_slave(uint8_t slave_address_in, uint8_t use_sleep,
void (*data_callback_in)(uint8_t buffer_size,
volatile uint8_t input_buffer_length, volatile const uint8_t *input_buffer,
volatile uint8_t *output_buffer_length, volatile uint8_t *output_buffer),
void (*idle_callback_in)(void))
{
slave_address = slave_address_in;
data_callback = data_callback_in;
idle_callback = idle_callback_in;
input_buffer_length = 0;
output_buffer_length = 0;
output_buffer_current = 0;
ss_state = ss_state_before_start;
if(use_sleep)
set_sleep_mode(SLEEP_MODE_IDLE);
twi_init();
sei();
for(;;)
{
if(use_sleep && (ss_state == ss_state_before_start))
sleep_mode();
if(USISR & _BV(USIPF))
{
cli();
#ifdef USE_STATS
if(stats_enabled)stop_conditions_count++;
#endif
USISR |= _BV(USIPF); // clear stop condition flag
switch(ss_state)
{
case(ss_state_after_start):
{
twi_reset();
break;
}
case(ss_state_data_processed):
{
#ifdef USE_STATS
if(stats_enabled)local_frames_count++;
#endif
output_buffer_length = 0;
output_buffer_current = 0;
data_callback(buffer_size, input_buffer_length, input_buffer, &output_buffer_length, output_buffer);
input_buffer_length = 0;
break;
}
}
ss_state = ss_state_before_start;
sei();
}
if(idle_callback)
{
idle_callback();
#ifdef USE_STATS
if(stats_enabled)idle_call_count++;
#endif
}
}
}
/**
* \brief wake up CryptoAuth device using I2C bus
*
* \param[in] iface interface to logical device to wakeup
*
* \return ATCA_STATUS
*/
ATCA_STATUS hal_i2c_wake(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
// set to default i2c bus
if (cfg->atcai2c.bus > MAX_I2C_BUSES - 1)
cfg->atcai2c.bus = 0;
int bus = cfg->atcai2c.bus;
int retries = cfg->rx_retries;
uint32_t bdrt = cfg->atcai2c.baud;
int status = !TWI_SUCCESS;
uint8_t data[4], expected[4] = { 0x04, 0x11, 0x33, 0x43 };
// if not already at 100kHz, change it
if (bdrt != 100000)
change_i2c_speed(iface, 100000);
// Send 0x00 as wake pulse
twi_write_byte(i2c_hal_data[bus]->twi_master_instance, 0x00);
// rounded up to the nearest ms
atca_delay_ms(((uint32_t)cfg->wake_delay + (1000 - 1)) / 1000); // wait tWHI + tWLO which is configured based on device type and configuration structure
twi_package_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void*)data,
.length = 4
};
// if necessary, revert baud rate to what came in.
if (bdrt != 100000)
change_i2c_speed(iface, bdrt);
while (retries-- > 0 && status != TWI_SUCCESS)
status = twi_master_read(i2c_hal_data[bus]->twi_master_instance, &packet);
if (status != TWI_SUCCESS)
return ATCA_COMM_FAIL;
if (memcmp(data, expected, 4) == 0)
return ATCA_SUCCESS;
return ATCA_COMM_FAIL;
}
/**
* \brief idle CryptoAuth device using I2C bus
*
* \param[in] iface interface to logical device to idle
*
* \return ATCA_STATUS
*/
ATCA_STATUS hal_i2c_idle(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
// set to default i2c bus
if (cfg->atcai2c.bus > MAX_I2C_BUSES - 1)
cfg->atcai2c.bus = 0;
int bus = cfg->atcai2c.bus;
uint8_t data[4];
data[0] = 0x02; // idle word address value
twi_package_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void*)data,
.length = 1
};
if (twi_master_write(i2c_hal_data[bus]->twi_master_instance, &packet) != TWI_SUCCESS)
return ATCA_COMM_FAIL;
return ATCA_SUCCESS;
}
/**
* \brief sleep CryptoAuth device using I2C bus
*
* \param[in] iface interface to logical device to sleep
*
* \return ATCA_STATUS
*/
ATCA_STATUS hal_i2c_sleep(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
// set to default i2c bus
if (cfg->atcai2c.bus > MAX_I2C_BUSES - 1)
cfg->atcai2c.bus = 0;
int bus = cfg->atcai2c.bus;
uint8_t data[4];
data[0] = 0x01; // sleep word address value
twi_package_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void*)data,
.length = 1
};
if (twi_master_write(i2c_hal_data[bus]->twi_master_instance, &packet) != TWI_SUCCESS)
return ATCA_COMM_FAIL;
return ATCA_SUCCESS;
}
/**
* \brief manages reference count on given bus and releases resource if no more refences exist
*
* \param[in] hal_data - opaque pointer to hal data structure - known only to the HAL implementation
*
* \return ATCA_STATUS
*/
ATCA_STATUS hal_i2c_release(void *hal_data)
{
ATCAI2CMaster_t *hal = (ATCAI2CMaster_t*)hal_data;
// set to default i2c bus
if (hal->bus_index > MAX_I2C_BUSES - 1)
hal->bus_index = 0;
i2c_bus_ref_ct--; // track total i2c bus interface instances for consistency checking and debugging
// if the use count for this bus has gone to 0 references, disable it. protect against an unbracketed release
if (hal && --(hal->ref_ct) <= 0 && i2c_hal_data[hal->bus_index] != NULL) {
twi_reset(hal->twi_master_instance);
free(i2c_hal_data[hal->bus_index]);
i2c_hal_data[hal->bus_index] = NULL;
}
return ATCA_SUCCESS;
}
/**
* \brief Reset TWI bus
*
* \param none.
*/
static void twi_slave_bus_reset(void)
{
slave_transfer.state = TWI_IDLE;
twi_reset();
}
/**
* \brief Reset TWI bus
*
* \param none.
*/
static void twi_master_bus_reset(void)
{
master_transfer.state = TWI_IDLE;
twi_master_busy = false;
twi_reset();
}
/** \brief wake up CryptoAuth device using I2C bus
* \param[in] interface to logical device to wakeup
*/
ATCA_STATUS hal_i2c_wake(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
int bus = cfg->atcai2c.bus;
int retries = cfg->rx_retries;
uint32_t bdrt = cfg->atcai2c.baud;
uint8_t data[4], expected[4] = { 0x04,0x11,0x33,0x43 };
int status = !TWI_SUCCESS;
// if not already at 100KHz, change it
if (bdrt != 100000)
{
change_i2c_speed(iface, 100000);
}
// Send 0x00 as wake pulse
switch(bus)
{
//case 0: twi_write_byte(TWI0, 0x00); break;
case 0: twi_write_byte(TWI_Channel0,0);break;
case 1: twi_write_byte(TWI_Channel1,0); break;
}
atca_delay_us(cfg->wake_delay); // wait tWHI + tWLO which is configured based on device type and configuration structure
//twi_package_t packet = {
twi_packet_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void *)data,
.length = 4
};
// if necessary, revert baud rate to what came in.
if (bdrt != 100000)
{
change_i2c_speed(iface, bdrt);
}
switch(bus)
{
case 0:
//if (twi_master_read(TWI0, &packet) != TWI_SUCCESS)
while (retries-- > 0 && status != TWI_SUCCESS)
status = twi_master_read(TWI_Channel0, &packet);
/*if (twi_master_read(TWI_Channel0, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}*/
break;
case 1:
/*
if (twi_master_read(TWI_Channel1, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}*/
break;
}
if (memcmp(data, expected, 4) == 0)
{
return ATCA_SUCCESS;
}
return ATCA_COMM_FAIL;
}
/** \brief idle CryptoAuth device using I2C bus
* \param[in] interface to logical device to idle
*/
ATCA_STATUS hal_i2c_idle(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
int bus = cfg->atcai2c.bus;
uint8_t data[4];
data[0] = 0x02; // idle word address value
//twi_package_t packet = {
twi_packet_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void *)data,
.length = 1
};
switch(bus)
{
case 0:
//if (twi_master_write(TWI0, &packet) != TWI_SUCCESS)
if (twi_master_write(TWI_Channel0, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}
break;
case 1:
if (twi_master_write(TWI_Channel1, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}
break;
}
return ATCA_SUCCESS;
}
/** \brief sleep CryptoAuth device using I2C bus
* \param[in] interface to logical device to sleep
*/
ATCA_STATUS hal_i2c_sleep(ATCAIface iface)
{
ATCAIfaceCfg *cfg = atgetifacecfg(iface);
int bus = cfg->atcai2c.bus;
uint8_t data[4];
data[0] = 0x01; // sleep word address value
//twi_package_t packet = {
twi_packet_t packet = {
.chip = cfg->atcai2c.slave_address >> 1,
.addr[0] = NULL,
.addr_length = 0,
.buffer = (void *)data,
.length = 1
};
switch(bus)
{
case 0:
//if (twi_master_write(TWI0, &packet) != TWI_SUCCESS)
if (twi_master_write(TWI_Channel0, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}
break;
case 1:
if (twi_master_write(TWI_Channel1, &packet) != TWI_SUCCESS)
{
return ATCA_COMM_FAIL;
}
break;
}
return ATCA_SUCCESS;
}
/** \brief manages reference count on given bus and releases resource if no more refences exist
* \param[in] hal_data - opaque pointer to hal data structure - known only to the HAL implementation
*/
ATCA_STATUS hal_i2c_release( void *hal_data )
{
ATCAI2CMaster_t *hal = (ATCAI2CMaster_t *)hal_data;
i2c_bus_ref_ct--; // track total i2c bus interface instances for consistency checking and debugging
// if the use count for this bus has gone to 0 references, disable it. protect against an unbracketed release
if (hal && --(hal->ref_ct) <= 0 && i2c_hal_data[hal->bus_index] != NULL)
{
switch(hal->bus_index)
{
//case 0: twi_reset(TWI0); break;
case 0: twi_reset(TWI_Channel0);break;
case 1: twi_reset(TWI_Channel1);break;
}
free(i2c_hal_data[hal->bus_index]);
i2c_hal_data[hal->bus_index] = NULL;
}
return ATCA_SUCCESS;
}