Tyler Weaver / Mbed 2 deprecated Serial_interrupts_buffered

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Dependencies:   buffered-serial1 mbed-rtos mbed

Fork of Serial_interrupts by jim hamblen

buffered_serial.cpp@1:2f1e54d137c7, 2012-12-10 (annotated)

Committer:
tylerjw
Date:
Mon Dec 10 00:32:22 2012 +0000
Revision:
1:2f1e54d137c7
Child:
2:3d959c9fc9d7
library based buffered serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tylerjw 1:2f1e54d137c7 1 #include "buffered_serial.h"
tylerjw 1:2f1e54d137c7 2
tylerjw 1:2f1e54d137c7 3 BufferedSerial::BufferedSerial(PinName tx, PinName rx) : Serial(tx,rx)
tylerjw 1:2f1e54d137c7 4 {
tylerjw 1:2f1e54d137c7 5 tx_in=0;
tylerjw 1:2f1e54d137c7 6 tx_out=0;
tylerjw 1:2f1e54d137c7 7 rx_in=0;
tylerjw 1:2f1e54d137c7 8 rx_out=0;
tylerjw 1:2f1e54d137c7 9
tylerjw 1:2f1e54d137c7 10 switch( _serial.index ) {
tylerjw 1:2f1e54d137c7 11 case 0:
tylerjw 1:2f1e54d137c7 12 device_irqn = UART0_IRQn;
tylerjw 1:2f1e54d137c7 13 break;
tylerjw 1:2f1e54d137c7 14 case 1:
tylerjw 1:2f1e54d137c7 15 device_irqn = UART1_IRQn;
tylerjw 1:2f1e54d137c7 16 break;
tylerjw 1:2f1e54d137c7 17 case 2:
tylerjw 1:2f1e54d137c7 18 device_irqn = UART2_IRQn;
tylerjw 1:2f1e54d137c7 19 break;
tylerjw 1:2f1e54d137c7 20 case 3:
tylerjw 1:2f1e54d137c7 21 device_irqn = UART3_IRQn;
tylerjw 1:2f1e54d137c7 22 break;
tylerjw 1:2f1e54d137c7 23 }
tylerjw 1:2f1e54d137c7 24 //device_irqn = UART1_IRQn;
tylerjw 1:2f1e54d137c7 25 // attach the interrupts
tylerjw 1:2f1e54d137c7 26 Serial::attach(this, &BufferedSerial::Rx_interrupt, Serial::RxIrq);
tylerjw 1:2f1e54d137c7 27 Serial::attach(this, &BufferedSerial::Tx_interrupt, Serial::TxIrq);
tylerjw 1:2f1e54d137c7 28 }
tylerjw 1:2f1e54d137c7 29
tylerjw 1:2f1e54d137c7 30 // Copy tx line buffer to large tx buffer for tx interrupt routine
tylerjw 1:2f1e54d137c7 31 void BufferedSerial::send_line(char *c)
tylerjw 1:2f1e54d137c7 32 {
tylerjw 1:2f1e54d137c7 33 int i;
tylerjw 1:2f1e54d137c7 34 char temp_char;
tylerjw 1:2f1e54d137c7 35 bool empty;
tylerjw 1:2f1e54d137c7 36 i = 0;
tylerjw 1:2f1e54d137c7 37 strncpy(tx_line,c,LINE_SIZE);
tylerjw 1:2f1e54d137c7 38 // Start Critical Section - don't interrupt while changing global buffer variables
tylerjw 1:2f1e54d137c7 39 NVIC_DisableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 40 empty = (tx_in == tx_out);
tylerjw 1:2f1e54d137c7 41 while ((i==0) || (tx_line[i-1] != '\n')) {
tylerjw 1:2f1e54d137c7 42 // Wait if buffer full
tylerjw 1:2f1e54d137c7 43 if (((tx_in + 1) & BUFFER_SIZE) == tx_out) {
tylerjw 1:2f1e54d137c7 44 // End Critical Section - need to let interrupt routine empty buffer by sending
tylerjw 1:2f1e54d137c7 45 NVIC_EnableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 46 while (((tx_in + 1) & BUFFER_SIZE) == tx_out) {
tylerjw 1:2f1e54d137c7 47 }
tylerjw 1:2f1e54d137c7 48 // Start Critical Section - don't interrupt while changing global buffer variables
tylerjw 1:2f1e54d137c7 49 NVIC_DisableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 50 }
tylerjw 1:2f1e54d137c7 51 tx_buffer[tx_in] = tx_line[i];
tylerjw 1:2f1e54d137c7 52 i++;
tylerjw 1:2f1e54d137c7 53 tx_in = (tx_in + 1) & BUFFER_SIZE;
tylerjw 1:2f1e54d137c7 54 }
tylerjw 1:2f1e54d137c7 55 if (Serial::writeable() && (empty)) {
tylerjw 1:2f1e54d137c7 56 temp_char = tx_buffer[tx_out];
tylerjw 1:2f1e54d137c7 57 tx_out = (tx_out + 1) & BUFFER_SIZE;
tylerjw 1:2f1e54d137c7 58 // Send first character to start tx interrupts, if stopped
tylerjw 1:2f1e54d137c7 59 Serial::putc(temp_char);
tylerjw 1:2f1e54d137c7 60 }
tylerjw 1:2f1e54d137c7 61 // End Critical Section
tylerjw 1:2f1e54d137c7 62 NVIC_EnableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 63 return;
tylerjw 1:2f1e54d137c7 64 }
tylerjw 1:2f1e54d137c7 65
tylerjw 1:2f1e54d137c7 66 // Read a line from the large rx buffer from rx interrupt routine
tylerjw 1:2f1e54d137c7 67 void BufferedSerial::read_line(char *c)
tylerjw 1:2f1e54d137c7 68 {
tylerjw 1:2f1e54d137c7 69 int i;
tylerjw 1:2f1e54d137c7 70 i = 0;
tylerjw 1:2f1e54d137c7 71 // Start Critical Section - don't interrupt while changing global buffer variables
tylerjw 1:2f1e54d137c7 72 NVIC_DisableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 73 // Loop reading rx buffer characters until end of line character
tylerjw 1:2f1e54d137c7 74 while ((i==0) || (rx_line[i-1] != '\r')) {
tylerjw 1:2f1e54d137c7 75 // Wait if buffer empty
tylerjw 1:2f1e54d137c7 76 if (rx_in == rx_out) {
tylerjw 1:2f1e54d137c7 77 // End Critical Section - need to allow rx interrupt to get new characters for buffer
tylerjw 1:2f1e54d137c7 78 NVIC_EnableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 79 while (rx_in == rx_out) {
tylerjw 1:2f1e54d137c7 80 }
tylerjw 1:2f1e54d137c7 81 // Start Critical Section - don't interrupt while changing global buffer variables
tylerjw 1:2f1e54d137c7 82 NVIC_DisableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 83 }
tylerjw 1:2f1e54d137c7 84 rx_line[i] = rx_buffer[rx_out];
tylerjw 1:2f1e54d137c7 85 i++;
tylerjw 1:2f1e54d137c7 86 rx_out = (rx_out + 1) & BUFFER_SIZE;
tylerjw 1:2f1e54d137c7 87 }
tylerjw 1:2f1e54d137c7 88 rx_line[i-1] = 0;
tylerjw 1:2f1e54d137c7 89 // End Critical Section
tylerjw 1:2f1e54d137c7 90 NVIC_EnableIRQ(device_irqn);
tylerjw 1:2f1e54d137c7 91 strncpy(c,rx_line,LINE_SIZE);
tylerjw 1:2f1e54d137c7 92 return;
tylerjw 1:2f1e54d137c7 93 }
tylerjw 1:2f1e54d137c7 94
tylerjw 1:2f1e54d137c7 95 // Interupt Routine to read in data from serial port
tylerjw 1:2f1e54d137c7 96 void BufferedSerial::Rx_interrupt()
tylerjw 1:2f1e54d137c7 97 {
tylerjw 1:2f1e54d137c7 98 //led1=1;
tylerjw 1:2f1e54d137c7 99 // Loop just in case more than one character is in UART's receive FIFO buffer
tylerjw 1:2f1e54d137c7 100 // Stop if buffer full
tylerjw 1:2f1e54d137c7 101 while ((Serial::readable()) || (((rx_in + 1) & BUFFER_SIZE) == rx_out)) {
tylerjw 1:2f1e54d137c7 102 rx_buffer[rx_in] = Serial::getc();
tylerjw 1:2f1e54d137c7 103 // Uncomment to Echo to USB serial to watch data flow
tylerjw 1:2f1e54d137c7 104 // monitor_Serial::putc(rx_buffer[rx_in]);
tylerjw 1:2f1e54d137c7 105 rx_in = (rx_in + 1) & BUFFER_SIZE;
tylerjw 1:2f1e54d137c7 106 }
tylerjw 1:2f1e54d137c7 107 //led1=0;
tylerjw 1:2f1e54d137c7 108 return;
tylerjw 1:2f1e54d137c7 109 }
tylerjw 1:2f1e54d137c7 110
tylerjw 1:2f1e54d137c7 111 // Interupt Routine to write out data to serial port
tylerjw 1:2f1e54d137c7 112 void BufferedSerial::Tx_interrupt()
tylerjw 1:2f1e54d137c7 113 {
tylerjw 1:2f1e54d137c7 114 //led2=1;
tylerjw 1:2f1e54d137c7 115 // Loop to fill more than one character in UART's transmit FIFO buffer
tylerjw 1:2f1e54d137c7 116 // Stop if buffer empty
tylerjw 1:2f1e54d137c7 117 while ((Serial::writeable()) && (tx_in != tx_out)) {
tylerjw 1:2f1e54d137c7 118 Serial::putc(tx_buffer[tx_out]);
tylerjw 1:2f1e54d137c7 119 tx_out = (tx_out + 1) & BUFFER_SIZE;
tylerjw 1:2f1e54d137c7 120 }
tylerjw 1:2f1e54d137c7 121 //led2=0;
tylerjw 1:2f1e54d137c7 122 return;
tylerjw 1:2f1e54d137c7 123 }