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
main.cpp
- Committer:
- mosi
- Date:
- 2014-08-01
- Revision:
- 2:94d791a36afe
- Parent:
- 1:ae55f51ee284
- Child:
- 3:4ed0d32d3b38
File content as of revision 2:94d791a36afe:
#include "mbed.h" #include "mbed_rpc.h" Serial pc(USBTX, USBRX); void Tx_interrupt(); void Rx_interrupt(); void send_line(); void read_line(); // Circular buffers for serial TX and RX data - used by interrupt routines const int buffer_size = 255; // might need to increase buffer size for high baud rates char tx_buffer[buffer_size]; char rx_buffer[buffer_size]; // Circular buffer pointers // volatile makes read-modify-write atomic volatile int tx_in=0; volatile int tx_out=0; volatile int rx_in=0; volatile int rx_out=0; // Line buffers for sprintf and sscanf char tx_line[80]; char rx_line[80]; int main() { char buf[256], outbuf[256]; pc.baud(115200); // setup the classes that can be created dynamically // RPC::add_rpc_class<RpcAnalogIn>(); // RPC::add_rpc_class<RpcAnalogOut>(); RPC::add_rpc_class<RpcDigitalIn>(); RPC::add_rpc_class<RpcDigitalOut>(); RPC::add_rpc_class<RpcDigitalInOut>(); RPC::add_rpc_class<RpcPwmOut>(); RPC::add_rpc_class<RpcTimer>(); RPC::add_rpc_class<RpcSPI>(); RPC::add_rpc_class<RpcSerial>(); // receive commands, and send back the responses pc.printf(" ************** Serial RPC example starting ************************* \r\n"); // Setup a serial interrupt function to receive data pc.attach(&Rx_interrupt, Serial::RxIrq); // Setup a serial interrupt function to transmit data //pc.attach(&Tx_interrupt, Serial::TxIrq); while(1) { // Read a line from the large rx buffer from rx interrupt routine read_line(); //pc.gets(buf, 4); //pc.printf("#> '%s'\r\n", buf); /************************************ This is an example of the RPC command required to create an LED object and turn it on: /DigitalOut/new LED1 myled /myled/write 1 ************************************* */ RPC::call(buf, outbuf); RPC::call(rx_line, outbuf); pc.printf("%s\r\n", outbuf); } } // Copy tx line buffer to large tx buffer for tx interrupt routine void send_line() { int i; char temp_char; bool empty; i = 0; // Start Critical Section - don't interrupt while changing global buffer variables NVIC_DisableIRQ(UART1_IRQn); empty = (tx_in == tx_out); while ((i==0) || (tx_line[i-1] != '\n')) { // Wait if buffer full if (((tx_in + 1) % buffer_size) == tx_out) { // End Critical Section - need to let interrupt routine empty buffer by sending NVIC_EnableIRQ(UART1_IRQn); while (((tx_in + 1) % buffer_size) == tx_out) { } // Start Critical Section - don't interrupt while changing global buffer variables NVIC_DisableIRQ(UART1_IRQn); } tx_buffer[tx_in] = tx_line[i]; i++; tx_in = (tx_in + 1) % buffer_size; } if (pc.writeable() && (empty)) { temp_char = tx_buffer[tx_out]; tx_out = (tx_out + 1) % buffer_size; // Send first character to start tx interrupts, if stopped pc.putc(temp_char); } // End Critical Section NVIC_EnableIRQ(UART1_IRQn); return; } // Read a line from the large rx buffer from rx interrupt routine void read_line() { int i; i = 0; // Start Critical Section - don't interrupt while changing global buffer variables NVIC_DisableIRQ(UART1_IRQn); // Loop reading rx buffer characters until end of line character while ((i==0) || (rx_line[i-1] != '\r')) { // Wait if buffer empty if (rx_in == rx_out) { // End Critical Section - need to allow rx interrupt to get new characters for buffer NVIC_EnableIRQ(UART1_IRQn); while (rx_in == rx_out) { } // Start Critical Section - don't interrupt while changing global buffer variables NVIC_DisableIRQ(UART1_IRQn); } rx_line[i] = rx_buffer[rx_out]; i++; rx_out = (rx_out + 1) % buffer_size; } // End Critical Section NVIC_EnableIRQ(UART1_IRQn); rx_line[i-1] = 0; return; } // Interupt Routine to read in data from serial port void Rx_interrupt() { // led1=1; // Loop just in case more than one character is in UART's receive FIFO buffer // Stop if buffer full while ((pc.readable()) && (((rx_in + 1) % buffer_size) != rx_out)) { rx_buffer[rx_in] = pc.getc(); // Uncomment to Echo to USB serial to watch data flow pc.putc(rx_buffer[rx_in]); rx_in = (rx_in + 1) % buffer_size; } // led1=0; return; } // Interupt Routine to write out data to serial port void Tx_interrupt() { // led2=1; // Loop to fill more than one character in UART's transmit FIFO buffer // Stop if buffer empty while ((pc.writeable()) && (tx_in != tx_out)) { pc.putc(tx_buffer[tx_out]); tx_out = (tx_out + 1) % buffer_size; } // led2=0; return; }