Potentiostat Team / rpc_over_serial_irq

RPC over Serial with read line interrupt tested on LPC1768 and mac minicom terminal. Baudrate 115200

Dependencies:   mbed-rpc-stmfork mbed-src

Fork of rpc_over_serial by Suga koubou

main.cpp@2:94d791a36afe, 2014-08-01 (annotated)

Committer:
mosi
Date:
Fri Aug 01 21:54:31 2014 +0000
Revision:
2:94d791a36afe
Parent:
1:ae55f51ee284
Child:
3:4ed0d32d3b38
Implemented serial read interrupt from another example, echoing of serial read and couple of comments;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 0:7e0e5391432a 1 #include "mbed.h"
okini3939 0:7e0e5391432a 2 #include "mbed_rpc.h"
okini3939 0:7e0e5391432a 3
okini3939 0:7e0e5391432a 4 Serial pc(USBTX, USBRX);
mosi 2:94d791a36afe 5 void Tx_interrupt();
mosi 2:94d791a36afe 6 void Rx_interrupt();
mosi 2:94d791a36afe 7 void send_line();
mosi 2:94d791a36afe 8 void read_line();
mosi 2:94d791a36afe 9
mosi 2:94d791a36afe 10
mosi 2:94d791a36afe 11 // Circular buffers for serial TX and RX data - used by interrupt routines
mosi 2:94d791a36afe 12 const int buffer_size = 255;
mosi 2:94d791a36afe 13 // might need to increase buffer size for high baud rates
mosi 2:94d791a36afe 14 char tx_buffer[buffer_size];
mosi 2:94d791a36afe 15 char rx_buffer[buffer_size];
mosi 2:94d791a36afe 16 // Circular buffer pointers
mosi 2:94d791a36afe 17 // volatile makes read-modify-write atomic
mosi 2:94d791a36afe 18 volatile int tx_in=0;
mosi 2:94d791a36afe 19 volatile int tx_out=0;
mosi 2:94d791a36afe 20 volatile int rx_in=0;
mosi 2:94d791a36afe 21 volatile int rx_out=0;
mosi 2:94d791a36afe 22 // Line buffers for sprintf and sscanf
mosi 2:94d791a36afe 23 char tx_line[80];
mosi 2:94d791a36afe 24 char rx_line[80];
mosi 2:94d791a36afe 25
mosi 2:94d791a36afe 26
okini3939 0:7e0e5391432a 27
okini3939 0:7e0e5391432a 28 int main() {
mosi 2:94d791a36afe 29
okini3939 0:7e0e5391432a 30 char buf[256], outbuf[256];
mosi 2:94d791a36afe 31 pc.baud(115200);
mosi 2:94d791a36afe 32
okini3939 0:7e0e5391432a 33 // setup the classes that can be created dynamically
mosi 2:94d791a36afe 34 // RPC::add_rpc_class<RpcAnalogIn>();
mosi 2:94d791a36afe 35 // RPC::add_rpc_class<RpcAnalogOut>();
okini3939 0:7e0e5391432a 36 RPC::add_rpc_class<RpcDigitalIn>();
okini3939 0:7e0e5391432a 37 RPC::add_rpc_class<RpcDigitalOut>();
okini3939 0:7e0e5391432a 38 RPC::add_rpc_class<RpcDigitalInOut>();
okini3939 0:7e0e5391432a 39 RPC::add_rpc_class<RpcPwmOut>();
okini3939 0:7e0e5391432a 40 RPC::add_rpc_class<RpcTimer>();
okini3939 0:7e0e5391432a 41 RPC::add_rpc_class<RpcSPI>();
okini3939 0:7e0e5391432a 42 RPC::add_rpc_class<RpcSerial>();
okini3939 0:7e0e5391432a 43
okini3939 0:7e0e5391432a 44 // receive commands, and send back the responses
mosi 2:94d791a36afe 45 pc.printf(" ************** Serial RPC example starting ************************* \r\n");
mosi 2:94d791a36afe 46 // Setup a serial interrupt function to receive data
mosi 2:94d791a36afe 47 pc.attach(&Rx_interrupt, Serial::RxIrq);
mosi 2:94d791a36afe 48 // Setup a serial interrupt function to transmit data
mosi 2:94d791a36afe 49 //pc.attach(&Tx_interrupt, Serial::TxIrq);
mosi 2:94d791a36afe 50
mosi 2:94d791a36afe 51
okini3939 0:7e0e5391432a 52 while(1) {
mosi 2:94d791a36afe 53 // Read a line from the large rx buffer from rx interrupt routine
mosi 2:94d791a36afe 54 read_line();
mosi 2:94d791a36afe 55
mosi 2:94d791a36afe 56 //pc.gets(buf, 4);
mosi 2:94d791a36afe 57 //pc.printf("#> '%s'\r\n", buf);
mosi 2:94d791a36afe 58
mosi 2:94d791a36afe 59 /************************************
mosi 2:94d791a36afe 60 This is an example of the RPC command required to create an LED object and turn it on:
mosi 2:94d791a36afe 61 /DigitalOut/new LED1 myled
mosi 2:94d791a36afe 62 /myled/write 1
mosi 2:94d791a36afe 63 *************************************
mosi 2:94d791a36afe 64 */
mosi 2:94d791a36afe 65
mosi 2:94d791a36afe 66
okini3939 0:7e0e5391432a 67 RPC::call(buf, outbuf);
mosi 2:94d791a36afe 68 RPC::call(rx_line, outbuf);
mosi 2:94d791a36afe 69
okini3939 0:7e0e5391432a 70 pc.printf("%s\r\n", outbuf);
okini3939 0:7e0e5391432a 71 }
okini3939 0:7e0e5391432a 72 }
mosi 2:94d791a36afe 73
mosi 2:94d791a36afe 74
mosi 2:94d791a36afe 75
mosi 2:94d791a36afe 76 // Copy tx line buffer to large tx buffer for tx interrupt routine
mosi 2:94d791a36afe 77 void send_line() {
mosi 2:94d791a36afe 78 int i;
mosi 2:94d791a36afe 79 char temp_char;
mosi 2:94d791a36afe 80 bool empty;
mosi 2:94d791a36afe 81 i = 0;
mosi 2:94d791a36afe 82 // Start Critical Section - don't interrupt while changing global buffer variables
mosi 2:94d791a36afe 83 NVIC_DisableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 84 empty = (tx_in == tx_out);
mosi 2:94d791a36afe 85 while ((i==0) || (tx_line[i-1] != '\n')) {
mosi 2:94d791a36afe 86 // Wait if buffer full
mosi 2:94d791a36afe 87 if (((tx_in + 1) % buffer_size) == tx_out) {
mosi 2:94d791a36afe 88 // End Critical Section - need to let interrupt routine empty buffer by sending
mosi 2:94d791a36afe 89 NVIC_EnableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 90 while (((tx_in + 1) % buffer_size) == tx_out) {
mosi 2:94d791a36afe 91 }
mosi 2:94d791a36afe 92 // Start Critical Section - don't interrupt while changing global buffer variables
mosi 2:94d791a36afe 93 NVIC_DisableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 94 }
mosi 2:94d791a36afe 95 tx_buffer[tx_in] = tx_line[i];
mosi 2:94d791a36afe 96 i++;
mosi 2:94d791a36afe 97 tx_in = (tx_in + 1) % buffer_size;
mosi 2:94d791a36afe 98 }
mosi 2:94d791a36afe 99 if (pc.writeable() && (empty)) {
mosi 2:94d791a36afe 100 temp_char = tx_buffer[tx_out];
mosi 2:94d791a36afe 101 tx_out = (tx_out + 1) % buffer_size;
mosi 2:94d791a36afe 102 // Send first character to start tx interrupts, if stopped
mosi 2:94d791a36afe 103 pc.putc(temp_char);
mosi 2:94d791a36afe 104 }
mosi 2:94d791a36afe 105 // End Critical Section
mosi 2:94d791a36afe 106 NVIC_EnableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 107 return;
mosi 2:94d791a36afe 108 }
mosi 2:94d791a36afe 109
mosi 2:94d791a36afe 110
mosi 2:94d791a36afe 111 // Read a line from the large rx buffer from rx interrupt routine
mosi 2:94d791a36afe 112 void read_line() {
mosi 2:94d791a36afe 113 int i;
mosi 2:94d791a36afe 114 i = 0;
mosi 2:94d791a36afe 115 // Start Critical Section - don't interrupt while changing global buffer variables
mosi 2:94d791a36afe 116 NVIC_DisableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 117 // Loop reading rx buffer characters until end of line character
mosi 2:94d791a36afe 118 while ((i==0) || (rx_line[i-1] != '\r')) {
mosi 2:94d791a36afe 119 // Wait if buffer empty
mosi 2:94d791a36afe 120 if (rx_in == rx_out) {
mosi 2:94d791a36afe 121 // End Critical Section - need to allow rx interrupt to get new characters for buffer
mosi 2:94d791a36afe 122 NVIC_EnableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 123 while (rx_in == rx_out) {
mosi 2:94d791a36afe 124 }
mosi 2:94d791a36afe 125 // Start Critical Section - don't interrupt while changing global buffer variables
mosi 2:94d791a36afe 126 NVIC_DisableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 127 }
mosi 2:94d791a36afe 128 rx_line[i] = rx_buffer[rx_out];
mosi 2:94d791a36afe 129 i++;
mosi 2:94d791a36afe 130 rx_out = (rx_out + 1) % buffer_size;
mosi 2:94d791a36afe 131 }
mosi 2:94d791a36afe 132 // End Critical Section
mosi 2:94d791a36afe 133 NVIC_EnableIRQ(UART1_IRQn);
mosi 2:94d791a36afe 134 rx_line[i-1] = 0;
mosi 2:94d791a36afe 135 return;
mosi 2:94d791a36afe 136 }
mosi 2:94d791a36afe 137
mosi 2:94d791a36afe 138
mosi 2:94d791a36afe 139 // Interupt Routine to read in data from serial port
mosi 2:94d791a36afe 140 void Rx_interrupt() {
mosi 2:94d791a36afe 141 // led1=1;
mosi 2:94d791a36afe 142 // Loop just in case more than one character is in UART's receive FIFO buffer
mosi 2:94d791a36afe 143 // Stop if buffer full
mosi 2:94d791a36afe 144 while ((pc.readable()) && (((rx_in + 1) % buffer_size) != rx_out)) {
mosi 2:94d791a36afe 145 rx_buffer[rx_in] = pc.getc();
mosi 2:94d791a36afe 146 // Uncomment to Echo to USB serial to watch data flow
mosi 2:94d791a36afe 147 pc.putc(rx_buffer[rx_in]);
mosi 2:94d791a36afe 148 rx_in = (rx_in + 1) % buffer_size;
mosi 2:94d791a36afe 149 }
mosi 2:94d791a36afe 150 // led1=0;
mosi 2:94d791a36afe 151 return;
mosi 2:94d791a36afe 152 }
mosi 2:94d791a36afe 153
mosi 2:94d791a36afe 154
mosi 2:94d791a36afe 155 // Interupt Routine to write out data to serial port
mosi 2:94d791a36afe 156 void Tx_interrupt() {
mosi 2:94d791a36afe 157 // led2=1;
mosi 2:94d791a36afe 158 // Loop to fill more than one character in UART's transmit FIFO buffer
mosi 2:94d791a36afe 159 // Stop if buffer empty
mosi 2:94d791a36afe 160 while ((pc.writeable()) && (tx_in != tx_out)) {
mosi 2:94d791a36afe 161 pc.putc(tx_buffer[tx_out]);
mosi 2:94d791a36afe 162 tx_out = (tx_out + 1) % buffer_size;
mosi 2:94d791a36afe 163 }
mosi 2:94d791a36afe 164 // led2=0;
mosi 2:94d791a36afe 165 return;
mosi 2:94d791a36afe 166 }