Prof Greg Egan
/
UAVXArm-GKE
UAVX Multicopter Flight Controller.
Methods/sb_getc.cpp@2:90292f8bd179, 2011-04-26 (annotated)
- Committer:
- gke
- Date:
- Tue Apr 26 12:12:29 2011 +0000
- Revision:
- 2:90292f8bd179
- Parent:
- 0:62a1c91a859a
Not flightworthy. Posted for others to make use of the I2C SW code.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
gke | 0:62a1c91a859a | 1 | /* |
gke | 0:62a1c91a859a | 2 | Copyright (c) 2010 Andy Kirkham |
gke | 0:62a1c91a859a | 3 | |
gke | 0:62a1c91a859a | 4 | Permission is hereby granted, free of charge, to any person obtaining a copy |
gke | 0:62a1c91a859a | 5 | of this software and associated documentation files (the "Software"), to deal |
gke | 0:62a1c91a859a | 6 | in the Software without restriction, including without limitation the rights |
gke | 0:62a1c91a859a | 7 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
gke | 0:62a1c91a859a | 8 | copies of the Software, and to permit persons to whom the Software is |
gke | 0:62a1c91a859a | 9 | furnished to do so, subject to the following conditions: |
gke | 0:62a1c91a859a | 10 | |
gke | 0:62a1c91a859a | 11 | The above copyright notice and this permission notice shall be included in |
gke | 0:62a1c91a859a | 12 | all copies or substantial portions of the Software. |
gke | 0:62a1c91a859a | 13 | |
gke | 0:62a1c91a859a | 14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
gke | 0:62a1c91a859a | 15 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
gke | 0:62a1c91a859a | 16 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
gke | 0:62a1c91a859a | 17 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
gke | 0:62a1c91a859a | 18 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
gke | 0:62a1c91a859a | 19 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
gke | 0:62a1c91a859a | 20 | THE SOFTWARE. |
gke | 0:62a1c91a859a | 21 | */ |
gke | 0:62a1c91a859a | 22 | |
gke | 0:62a1c91a859a | 23 | #include "../SerialBuffered.h" |
gke | 0:62a1c91a859a | 24 | #include "../sb_globals.h" |
gke | 0:62a1c91a859a | 25 | |
gke | 0:62a1c91a859a | 26 | int SerialBuffered::getc(bool blocking) { |
gke | 0:62a1c91a859a | 27 | char c; |
gke | 0:62a1c91a859a | 28 | |
gke | 0:62a1c91a859a | 29 | if (blocking) while (_rx_buffer_out[uart_number] == _rx_buffer_in[uart_number] && !_rx_buffer_full[uart_number]) ; /* Blocks! */ |
gke | 0:62a1c91a859a | 30 | else if (_rx_buffer_in[uart_number] == _rx_buffer_out[uart_number] && !_rx_buffer_full[uart_number]) return -1; |
gke | 0:62a1c91a859a | 31 | |
gke | 0:62a1c91a859a | 32 | c = _rx_buffer[uart_number][_rx_buffer_out[uart_number]++]; |
gke | 0:62a1c91a859a | 33 | if (_rx_buffer_out[uart_number] >= _rx_buffer_size[uart_number]) { |
gke | 0:62a1c91a859a | 34 | _rx_buffer_out[uart_number] = 0; |
gke | 0:62a1c91a859a | 35 | } |
gke | 0:62a1c91a859a | 36 | if (_rx_buffer_full[uart_number]) _rx_buffer_full[uart_number] = false; |
gke | 0:62a1c91a859a | 37 | return (int)c; |
gke | 0:62a1c91a859a | 38 | } |
gke | 0:62a1c91a859a | 39 | |
gke | 0:62a1c91a859a | 40 | char SerialBuffered::getc(void) { |
gke | 0:62a1c91a859a | 41 | return (char)getc(true); |
gke | 0:62a1c91a859a | 42 | } |
gke | 0:62a1c91a859a | 43 | |
gke | 0:62a1c91a859a | 44 | int SerialBuffered::readable(void) { |
gke | 0:62a1c91a859a | 45 | return (_rx_buffer_full[uart_number] || _rx_buffer_overflow[uart_number] || _rx_buffer_in[uart_number] != _rx_buffer_out[uart_number]) ? 1 : 0; |
gke | 0:62a1c91a859a | 46 | } |