/** Release a SPI object
*
* TODO: spi_free is currently unimplemented
* This will require reference counting at the C++ level to be safe
*
* Return the pins owned by the SPI object to their reset state
* Disable the SPI peripheral
* Disable the SPI clock
* @param[in] obj The SPI object to deinitialize
*/
void spi_free(spi_t *obj)
{
struct spi_s *spiobj = SPI_S(obj);
spi_disable(spiobj->spi);
/* Disable and deinit SPI */
if (spiobj->spi == SPI0) {
spi_i2s_deinit(SPI0);
rcu_periph_clock_disable(RCU_SPI0);
}
if (spiobj->spi == SPI1) {
spi_i2s_deinit(SPI1);
rcu_periph_clock_disable(RCU_SPI1);
}
if (spiobj->spi == SPI2) {
spi_i2s_deinit(SPI2);
rcu_periph_clock_disable(RCU_SPI2);
}
/* Deinit GPIO mode of SPI pins */
pin_function(spiobj->pin_miso, MODE_IN_FLOATING);
pin_function(spiobj->pin_mosi, MODE_IN_FLOATING);
pin_function(spiobj->pin_sclk, MODE_IN_FLOATING);
if (spiobj->spi_struct.nss != SPI_NSS_SOFT) {
pin_function(spiobj->pin_ssel, MODE_IN_FLOATING);
}
}
/** disable CAN.
*
*/
void can_free(can_t *obj)
{
can_deinit(obj->can);
if (obj->can == CAN0) {
rcu_periph_clock_disable(RCU_CAN0);
}
if (obj->can == CAN1) {
rcu_periph_clock_disable(RCU_CAN1);
}
}
/** Release the analogout object
*
* Note: This is not currently used in the mbed-drivers
* @param obj The analogout object
*/
void analogout_free(dac_t *obj)
{
/* reset DAC and disable clock */
dac_deinit();
rcu_periph_clock_disable(RCU_DAC);
/* configure GPIO */
/* get the pin function and assign the used channel to the object */
uint32_t function = pinmap_function(obj->pin, PinMap_DAC);
MBED_ASSERT(function != (uint32_t)NC);
pin_function(obj->pin, function);
}
/** Release the serial peripheral, not currently invoked. It requires further
* resource management.
*
* @param obj The serial object
*/
void serial_free(serial_t *obj)
{
struct serial_s *p_obj = GET_SERIAL_S(obj);
rcu_periph_enum rcu_periph = usart_clk[p_obj->index];
/* reset USART and disable clock */
usart_deinit(p_obj->uart);
rcu_periph_clock_disable(rcu_periph);
serial_irq_ids[p_obj->index] = 0;
/* reset the GPIO state */
pin_function(p_obj->pin_tx, MODE_IN_FLOATING);
pin_function(p_obj->pin_rx, MODE_IN_FLOATING);
}
