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PUTC.cpp
00001 /* 00002 Copyright (c) 2010 Andy Kirkham 00003 00004 Permission is hereby granted, free of charge, to any person obtaining a copy 00005 of this software and associated documentation files (the "Software"), to deal 00006 in the Software without restriction, including without limitation the rights 00007 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 copies of the Software, and to permit persons to whom the Software is 00009 furnished to do so, subject to the following conditions: 00010 00011 The above copyright notice and this permission notice shall be included in 00012 all copies or substantial portions of the Software. 00013 00014 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 THE SOFTWARE. 00021 */ 00022 00023 #include "MODSERIAL.h" 00024 #include "MACROS.h" 00025 00026 namespace AjK { 00027 00028 int 00029 MODSERIAL::__putc(int c, bool block) { 00030 00031 // If no buffer is in use fall back to standard TX FIFO usage. 00032 // Note, we must block in this case and ignore bool "block" 00033 // so as to maintain compat with Mbed Serial. 00034 if (buffer[TxIrq] == (char *)NULL || buffer_size[TxIrq] == 0) { 00035 while (! MODSERIAL_THR_HAS_SPACE) ; // Wait for space in the TX FIFO. 00036 _THR = (uint32_t)c; 00037 return 0; 00038 } 00039 00040 if ( MODSERIAL_THR_HAS_SPACE && MODSERIAL_TX_BUFFER_EMPTY && dmaSendChannel == -1 ) { 00041 _THR = (uint32_t)c; 00042 } 00043 else { 00044 if (block) { 00045 uint32_t ier = _IER; _IER = 1; 00046 while ( MODSERIAL_TX_BUFFER_FULL ) { // Blocks! 00047 // If putc() is called from an ISR then we are stuffed 00048 // because in an ISR no bytes from the TX buffer will 00049 // get transferred to teh TX FIFOs while we block here. 00050 // So, to work around this, instead of sitting in a 00051 // loop waiting for space in the TX buffer (which will 00052 // never happen in IRQ context), check to see if the 00053 // TX FIFO has space available to move bytes from the 00054 // TX buffer to TX FIFO to make space. The easiest way 00055 // to do this is to poll the isr_tx() function while we 00056 // are blocking. 00057 isr_tx(false); 00058 } 00059 _IER = ier; 00060 } 00061 else if( MODSERIAL_TX_BUFFER_FULL ) { 00062 buffer_overflow[TxIrq] = c; // Oh dear, no room in buffer. 00063 _isr[TxOvIrq].call(&this->callbackInfo); 00064 return -1; 00065 } 00066 _IER &= ~2; 00067 buffer[TxIrq][buffer_in[TxIrq]] = c; 00068 __disable_irq(); 00069 buffer_count[TxIrq]++; 00070 __enable_irq(); 00071 buffer_in[TxIrq]++; 00072 if (buffer_in[TxIrq] >= buffer_size[TxIrq]) { 00073 buffer_in[TxIrq] = 0; 00074 } 00075 _IER |= 2; 00076 } 00077 00078 return 0; 00079 } 00080 00081 }; // namespace AjK ends
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