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AP_HAL: added locking against read for UARTs

This commit is contained in:
Andrew Tridgell 2018-12-19 22:23:40 +11:00
parent 4886ccd8ba
commit 1fd1614e34
1 changed files with 4 additions and 1 deletions
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5
libraries/AP_HAL/UARTDriver.h
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@ -39,12 +39,15 @@ public:
virtual bool tx_pending() = 0;
// lock a port for exclusive use. Use a key of 0 to unlock
virtual bool lock_port(uint32_t key) { return false; }
virtual bool lock_port(uint32_t write_key, uint32_t read_key) { return false; }
// write to a locked port. If port is locked and key is not correct then 0 is returned
// and write is discarded
virtual size_t write_locked(const uint8_t *buffer, size_t size, uint32_t key) { return 0; }
// read from a locked port. If port is locked and key is not correct then 0 is returned
virtual int16_t read_locked(uint32_t key) { return -1; }
// control optional features
virtual bool set_options(uint8_t options) { return options==0; }