Arthur Ganger / Mbed 2 deprecated Talking_Braille_SMS

A talking braille-input text message device!!

Dependencies:   Braille_In PinDetect mbed

MODSERIAL/PUTC.cpp@1:4e1b66d0799f, 2012-10-12 (annotated)

Committer:
aganger3
Date:
Fri Oct 12 18:05:42 2012 +0000
Revision:
1:4e1b66d0799f
Parent:
0:c79379695e18 
Changed title in comment;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aganger3 0:c79379695e18 1 /*
aganger3 0:c79379695e18 2 Copyright (c) 2010 Andy Kirkham
aganger3 0:c79379695e18 3
aganger3 0:c79379695e18 4 Permission is hereby granted, free of charge, to any person obtaining a copy
aganger3 0:c79379695e18 5 of this software and associated documentation files (the "Software"), to deal
aganger3 0:c79379695e18 6 in the Software without restriction, including without limitation the rights
aganger3 0:c79379695e18 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
aganger3 0:c79379695e18 8 copies of the Software, and to permit persons to whom the Software is
aganger3 0:c79379695e18 9 furnished to do so, subject to the following conditions:
aganger3 0:c79379695e18 10
aganger3 0:c79379695e18 11 The above copyright notice and this permission notice shall be included in
aganger3 0:c79379695e18 12 all copies or substantial portions of the Software.
aganger3 0:c79379695e18 13
aganger3 0:c79379695e18 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
aganger3 0:c79379695e18 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
aganger3 0:c79379695e18 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
aganger3 0:c79379695e18 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
aganger3 0:c79379695e18 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
aganger3 0:c79379695e18 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
aganger3 0:c79379695e18 20 THE SOFTWARE.
aganger3 0:c79379695e18 21 */
aganger3 0:c79379695e18 22
aganger3 0:c79379695e18 23 #include "MODSERIAL.h"
aganger3 0:c79379695e18 24 #include "MACROS.h"
aganger3 0:c79379695e18 25
aganger3 0:c79379695e18 26 namespace AjK {
aganger3 0:c79379695e18 27
aganger3 0:c79379695e18 28 int
aganger3 0:c79379695e18 29 MODSERIAL::__putc(int c, bool block) {
aganger3 0:c79379695e18 30
aganger3 0:c79379695e18 31 // If no buffer is in use fall back to standard TX FIFO usage.
aganger3 0:c79379695e18 32 // Note, we must block in this case and ignore bool "block"
aganger3 0:c79379695e18 33 // so as to maintain compat with Mbed Serial.
aganger3 0:c79379695e18 34 if (buffer[TxIrq] == (char *)NULL || buffer_size[TxIrq] == 0) {
aganger3 0:c79379695e18 35 while (! MODSERIAL_THR_HAS_SPACE) ; // Wait for space in the TX FIFO.
aganger3 0:c79379695e18 36 _THR = (uint32_t)c;
aganger3 0:c79379695e18 37 return 0;
aganger3 0:c79379695e18 38 }
aganger3 0:c79379695e18 39
aganger3 0:c79379695e18 40 if ( MODSERIAL_THR_HAS_SPACE && MODSERIAL_TX_BUFFER_EMPTY && dmaSendChannel == -1 ) {
aganger3 0:c79379695e18 41 _THR = (uint32_t)c;
aganger3 0:c79379695e18 42 }
aganger3 0:c79379695e18 43 else {
aganger3 0:c79379695e18 44 if (block) {
aganger3 0:c79379695e18 45 uint32_t ier = _IER; _IER = 1;
aganger3 0:c79379695e18 46 while ( MODSERIAL_TX_BUFFER_FULL ) { // Blocks!
aganger3 0:c79379695e18 47 // If putc() is called from an ISR then we are stuffed
aganger3 0:c79379695e18 48 // because in an ISR no bytes from the TX buffer will
aganger3 0:c79379695e18 49 // get transferred to teh TX FIFOs while we block here.
aganger3 0:c79379695e18 50 // So, to work around this, instead of sitting in a
aganger3 0:c79379695e18 51 // loop waiting for space in the TX buffer (which will
aganger3 0:c79379695e18 52 // never happen in IRQ context), check to see if the
aganger3 0:c79379695e18 53 // TX FIFO has space available to move bytes from the
aganger3 0:c79379695e18 54 // TX buffer to TX FIFO to make space. The easiest way
aganger3 0:c79379695e18 55 // to do this is to poll the isr_tx() function while we
aganger3 0:c79379695e18 56 // are blocking.
aganger3 0:c79379695e18 57 isr_tx(false);
aganger3 0:c79379695e18 58 }
aganger3 0:c79379695e18 59 _IER = ier;
aganger3 0:c79379695e18 60 }
aganger3 0:c79379695e18 61 else if( MODSERIAL_TX_BUFFER_FULL ) {
aganger3 0:c79379695e18 62 buffer_overflow[TxIrq] = c; // Oh dear, no room in buffer.
aganger3 0:c79379695e18 63 _isr[TxOvIrq].call(&this->callbackInfo);
aganger3 0:c79379695e18 64 return -1;
aganger3 0:c79379695e18 65 }
aganger3 0:c79379695e18 66 _IER &= ~2;
aganger3 0:c79379695e18 67 buffer[TxIrq][buffer_in[TxIrq]] = c;
aganger3 0:c79379695e18 68 buffer_count[TxIrq]++;
aganger3 0:c79379695e18 69 buffer_in[TxIrq]++;
aganger3 0:c79379695e18 70 if (buffer_in[TxIrq] >= buffer_size[TxIrq]) {
aganger3 0:c79379695e18 71 buffer_in[TxIrq] = 0;
aganger3 0:c79379695e18 72 }
aganger3 0:c79379695e18 73 _IER |= 2;
aganger3 0:c79379695e18 74 }
aganger3 0:c79379695e18 75
aganger3 0:c79379695e18 76 return 0;
aganger3 0:c79379695e18 77 }
aganger3 0:c79379695e18 78
aganger3 0:c79379695e18 79 }; // namespace AjK ends