Serial Interrupt Library with mbed RTOS for multi-threading
Dependencies: buffered-serial1 mbed-rtos mbed
Fork of Serial_interrupts by
Revision 8:df59d668cab1, committed 2012-12-10
- Comitter:
- tylerjw
- Date:
- Mon Dec 10 23:42:58 2012 +0000
- Parent:
- 7:180678808740
- Child:
- 9:dbcc3caeba88
- Commit message:
- moved to library
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/buffered-serial1.lib Mon Dec 10 23:42:58 2012 +0000 @@ -0,0 +1,1 @@ +buffered-serial1#707b9f3904dd
--- a/buffered_serial.cpp Mon Dec 10 23:27:28 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,121 +0,0 @@ -#include "buffered_serial.h" - -BufferedSerial::BufferedSerial(PinName tx, PinName rx) : Serial(tx,rx), led1(LED1), led2(LED2), rx_sem(0), tx_sem(0) -{ - tx_in=0; - tx_out=0; - rx_in=0; - rx_out=0; - - switch( _serial.index ) { - case 0: - device_irqn = UART0_IRQn; - break; - case 1: - device_irqn = UART1_IRQn; - break; - case 2: - device_irqn = UART2_IRQn; - break; - case 3: - device_irqn = UART3_IRQn; - break; - } - - // attach the interrupts - Serial::attach(this, &BufferedSerial::Rx_interrupt, Serial::RxIrq); - Serial::attach(this, &BufferedSerial::Tx_interrupt, Serial::TxIrq); -} - -// Copy tx line buffer to large tx buffer for tx interrupt routine -void BufferedSerial::send_line(char *c) -{ - int i; - char temp_char; - bool empty; - i = 0; - strncpy(tx_line,c,LINE_SIZE); - // Start Critical Section - don't interrupt while changing global buffer variables - NVIC_DisableIRQ(device_irqn); - empty = (tx_in == tx_out); - while ((i==0) || (tx_line[i-1] != '\n')) { - // Wait if buffer full - if (IS_TX_FULL) { - // End Critical Section - need to let interrupt routine empty buffer by sending - NVIC_EnableIRQ(device_irqn); - //while (IS_TX_FULL) ; // buffer is full - tx_sem.wait(); - // Start Critical Section - don't interrupt while changing global buffer variables - NVIC_DisableIRQ(device_irqn); - } - tx_buffer[tx_in] = tx_line[i]; - i++; - tx_in = NEXT(tx_in); - } - if (Serial::writeable() && (empty)) { - temp_char = tx_buffer[tx_out]; - tx_out = NEXT(tx_out); - // Send first character to start tx interrupts, if stopped - LPC_UART1->THR = temp_char; - } - // End Critical Section - NVIC_EnableIRQ(device_irqn); -} - -// Read a line from the large rx buffer from rx interrupt routine -void BufferedSerial::read_line(char *c) -{ - int i; - i = 0; - // Start Critical Section - don't interrupt while changing global buffer variables - NVIC_DisableIRQ(device_irqn); - // Loop reading rx buffer characters until end of line character - while ((i==0) || (rx_line[i-1] != '\r')) { - // Wait if buffer empty - if (IS_RX_EMPTY) { // buffer empty - // End Critical Section - need to allow rx interrupt to get new characters for buffer - NVIC_EnableIRQ(device_irqn); - //while (rx_in == rx_out) ; // buffer empty - rx_sem.wait(); - // Start Critical Section - don't interrupt while changing global buffer variables - NVIC_DisableIRQ(device_irqn); - } else { - rx_sem.wait(); - } - rx_line[i] = rx_buffer[rx_out]; - i++; - rx_out = NEXT(rx_out); - - } - rx_line[i-1] = 0; - // End Critical Section - NVIC_EnableIRQ(device_irqn); - strncpy(c,rx_line,LINE_SIZE); -} - -// Interupt Routine to read in data from serial port -void BufferedSerial::Rx_interrupt() -{ - uint32_t IRR1 = LPC_UART1->IIR; - led1=1; - while (readable() && !(IS_RX_FULL)) { - rx_buffer[rx_in] = LPC_UART1->RBR; - rx_in = NEXT(rx_in); - rx_sem.release(); - } - led1=0; -} - -// Interupt Routine to write out data to serial port -void BufferedSerial::Tx_interrupt() -{ - uint32_t IRR = LPC_UART1->IIR; - led2=1; - while ((writeable()) && (tx_in != tx_out)) { // while serial is writeable and there are still characters in the buffer - LPC_UART1->THR = tx_buffer[tx_out]; // send the character - tx_out = NEXT(tx_out); - } - if(!IS_TX_FULL) // if not full - tx_sem.release(); - led2=0; -} \ No newline at end of file
--- a/buffered_serial.h Mon Dec 10 23:27:28 2012 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,49 +0,0 @@ -#ifndef BUFFERED_SERIAL_H -#define BUFFERED_SERIAL_H - -#define BUFFER_SIZE 255 -#define LINE_SIZE 80 -#define NEXT(x) ((x+1)&BUFFER_SIZE) -#define IS_TX_FULL (((tx_in + 1) & BUFFER_SIZE) == tx_out) -#define IS_RX_FULL (((rx_in + 1) & BUFFER_SIZE) == rx_out) -#define IS_RX_EMPTY (rx_in == rx_out) - -#include "mbed.h" -#include "rtos.h" - -class BufferedSerial : public Serial -{ -public: - BufferedSerial(PinName tx, PinName rx); - - void send_line(char*); - void read_line(char*); - -private: - void Tx_interrupt(); - void Rx_interrupt(); - -// for disabling the irq - IRQn device_irqn; -// Circular buffers for serial TX and RX data - used by interrupt routines -// 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; - volatile int tx_out; - volatile int rx_in; - volatile int rx_out; -// Line buffers for sprintf and sscanf - char tx_line[LINE_SIZE]; - char rx_line[LINE_SIZE]; - - DigitalOut led1; - DigitalOut led2; - - Semaphore rx_sem; - Semaphore tx_sem; -}; - -#endif \ No newline at end of file
--- a/main.cpp Mon Dec 10 23:27:28 2012 +0000 +++ b/main.cpp Mon Dec 10 23:42:58 2012 +0000 @@ -6,7 +6,7 @@ // LED1 and LED2 indicate RX and TX interrupt routine activity // LED3 changing indicate main loop running -BufferedSerial device(p13,p14); // tx, rx +BufferedSerial device(p13,p14); // UART1 - p13, p14 DigitalOut led3(LED3); DigitalOut led4(LED4);