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Improve UART power-cycling logic:

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* Only enable TX by default.
* Add some magic for RX handling. When an input handler is registered:
  * Automatically enable RX-related and interrupts
  * Automatically lock the SERIAL PD on under all power modes
  * Automatically enable the UART clock under sleep and deep sleep
  * Automatically undo all of the above when the input handler becomes NULL
  * As a result, modules / examples that need UART RX no longer need to clock the UART and manipulate the SERIAL PD. They simply have to specify an input handler
* Don't automatically power on the UART whenever the CM3 is active
* Before accessing the UART, make sure it is powered and clocked
* Avoid falling edge glitches
* Fix garbage characters / Explicitly wait for UART TX to complete
This commit is contained in:
George Oikonomou 2015-05-01 17:03:26 +01:00
parent 34f52ed08e
commit 07272b7cd6
3 changed files with 271 additions and 95 deletions
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23
cpu/cc26xx/dev/cc26xx-uart.h
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@ -63,9 +63,32 @@ void cc26xx_uart_write_byte(uint8_t b);
/**
* \brief Assigns a callback to be called when the UART receives a byte
* \param input A pointer to the function
*
* If \e input is NULL, the UART driver will assume that RX functionality is
* not required and it will be disabled. It will also disable the module's
* clocks under sleep and deep sleep and allow the SERIAL PD to be powered off.
*
* If \e input is not NULL, the UART driver will assume that RX is in fact
* required and it will be enabled. The module's clocks will be enabled under
* sleep and deep sleep and the driver will not allow the SERIAL PD to turn
* off during deep sleep, so that the UART can still receive bytes.
*
* \note This has a significant impact on overall energy consumption, so you
* should only enabled UART RX input when it's actually required.
*/
void cc26xx_uart_set_input(int (*input)(unsigned char c));
/**
* \brief Returns the UART busy status
* \return UART_IDLE or UART_BUSY
*
* ti_lib_uart_busy() will access UART registers. It is our responsibility
* to first make sure the UART is accessible before calling it. Hence this
* wrapper.
*
* Return values are defined in CC26xxware's uart.h
*/
uint8_t cc26xx_uart_busy(void);
/** @} */
/*---------------------------------------------------------------------------*/
#endif /* CC26XX_UART_H_ */