Xiaohai Li / Mbed 2 deprecated USB_VCP_Passthrough_F429

USB Serial to physical UART pass through demo. - legacy mbed (no RTOS) - Interrupt mode + ring buffer on both VCP and UART, which can survive in press-test

Dependencies:   USBDevice mbed

main.cpp@0:b44aebdb4d65, 2018-09-14 (annotated)

Committer:
nightseas
Date:
Fri Sep 14 07:31:51 2018 +0000
Revision:
0:b44aebdb4d65
Initial commit.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nightseas 0:b44aebdb4d65 1 #include "mbed.h"
nightseas 0:b44aebdb4d65 2 #include "USBSerial.h"
nightseas 0:b44aebdb4d65 3 #include "USBMSD.h"
nightseas 0:b44aebdb4d65 4
nightseas 0:b44aebdb4d65 5 // Ring buffer for serial RX data - used by interrupt routines
nightseas 0:b44aebdb4d65 6 #define SERIAL_RX_BUFF_LEN 2047
nightseas 0:b44aebdb4d65 7 // might need to increase buffer size for high baud rates
nightseas 0:b44aebdb4d65 8 char serial_rx_buffer[SERIAL_RX_BUFF_LEN+1];
nightseas 0:b44aebdb4d65 9 // Ring buffer pointers
nightseas 0:b44aebdb4d65 10 // volatile makes read-modify-write atomic
nightseas 0:b44aebdb4d65 11 volatile int serial_rx_in_inx=0;
nightseas 0:b44aebdb4d65 12 volatile int serial_rx_out_inx=0;
nightseas 0:b44aebdb4d65 13
nightseas 0:b44aebdb4d65 14 // might need to increase buffer size for high baud rates
nightseas 0:b44aebdb4d65 15 char vcp_rx_buffer[SERIAL_RX_BUFF_LEN+1];
nightseas 0:b44aebdb4d65 16 // Ring buffer pointers
nightseas 0:b44aebdb4d65 17 // volatile makes read-modify-write atomic
nightseas 0:b44aebdb4d65 18 volatile int vcp_rx_in_inx=0;
nightseas 0:b44aebdb4d65 19 volatile int vcp_rx_out_inx=0;
nightseas 0:b44aebdb4d65 20
nightseas 0:b44aebdb4d65 21 USBSerial vcp2;
nightseas 0:b44aebdb4d65 22 USBSerial vcp3;
nightseas 0:b44aebdb4d65 23 USBSerial vcp;
nightseas 0:b44aebdb4d65 24
nightseas 0:b44aebdb4d65 25 RawSerial pc(SERIAL_TX, SERIAL_RX, 115200);
nightseas 0:b44aebdb4d65 26
nightseas 0:b44aebdb4d65 27 DigitalOut led1(LED1), led2(LED2), led3(LED3);
nightseas 0:b44aebdb4d65 28
nightseas 0:b44aebdb4d65 29 // Interupt Routine to read in data from serial port
nightseas 0:b44aebdb4d65 30 void vcp_rx_isr_handler( void )
nightseas 0:b44aebdb4d65 31 {
nightseas 0:b44aebdb4d65 32 led2 = !led2;
nightseas 0:b44aebdb4d65 33 // Loop just in case more than one character is in UART's receive FIFO buffer
nightseas 0:b44aebdb4d65 34 // Stop if buffer full
nightseas 0:b44aebdb4d65 35 while( vcp.readable() && ( (vcp_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN != vcp_rx_out_inx ) )
nightseas 0:b44aebdb4d65 36 {
nightseas 0:b44aebdb4d65 37 vcp_rx_buffer[vcp_rx_in_inx] = vcp.getc();
nightseas 0:b44aebdb4d65 38 vcp_rx_in_inx = (vcp_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN;
nightseas 0:b44aebdb4d65 39 }
nightseas 0:b44aebdb4d65 40 return;
nightseas 0:b44aebdb4d65 41 }
nightseas 0:b44aebdb4d65 42
nightseas 0:b44aebdb4d65 43 // Interupt Routine to read in data from serial port
nightseas 0:b44aebdb4d65 44 void serial_rx_isr_handler( void )
nightseas 0:b44aebdb4d65 45 {
nightseas 0:b44aebdb4d65 46 led3 = !led3;
nightseas 0:b44aebdb4d65 47 // Loop just in case more than one character is in UART's receive FIFO buffer
nightseas 0:b44aebdb4d65 48 // Stop if buffer full
nightseas 0:b44aebdb4d65 49 while( pc.readable() && ( (serial_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN != serial_rx_out_inx ) )
nightseas 0:b44aebdb4d65 50 {
nightseas 0:b44aebdb4d65 51 serial_rx_buffer[serial_rx_in_inx] = pc.getc();
nightseas 0:b44aebdb4d65 52 serial_rx_in_inx = (serial_rx_in_inx + 1) % SERIAL_RX_BUFF_LEN;
nightseas 0:b44aebdb4d65 53 }
nightseas 0:b44aebdb4d65 54 return;
nightseas 0:b44aebdb4d65 55 }
nightseas 0:b44aebdb4d65 56
nightseas 0:b44aebdb4d65 57
nightseas 0:b44aebdb4d65 58 int main(void)
nightseas 0:b44aebdb4d65 59 {
nightseas 0:b44aebdb4d65 60 pc.attach(&serial_rx_isr_handler, Serial::RxIrq);
nightseas 0:b44aebdb4d65 61 vcp.attach(&vcp_rx_isr_handler);
nightseas 0:b44aebdb4d65 62 pc.printf("\n\r\n\r\n\r========== USB Device Test ==========\n\r\n\r");
nightseas 0:b44aebdb4d65 63 vcp.printf("\n\r\n\r\n\r========== USB Device Test ==========\n\r\n\r");
nightseas 0:b44aebdb4d65 64 while (1)
nightseas 0:b44aebdb4d65 65 {
nightseas 0:b44aebdb4d65 66 while( serial_rx_in_inx != serial_rx_out_inx )
nightseas 0:b44aebdb4d65 67 {
nightseas 0:b44aebdb4d65 68 vcp.putc(serial_rx_buffer[serial_rx_out_inx]);
nightseas 0:b44aebdb4d65 69 serial_rx_out_inx = (serial_rx_out_inx + 1) % SERIAL_RX_BUFF_LEN;
nightseas 0:b44aebdb4d65 70 led1 = !led1;
nightseas 0:b44aebdb4d65 71 }
nightseas 0:b44aebdb4d65 72 while( vcp_rx_in_inx != vcp_rx_out_inx )
nightseas 0:b44aebdb4d65 73 {
nightseas 0:b44aebdb4d65 74 pc.putc(vcp_rx_buffer[vcp_rx_out_inx]);
nightseas 0:b44aebdb4d65 75 vcp_rx_out_inx = (vcp_rx_out_inx + 1) % SERIAL_RX_BUFF_LEN;
nightseas 0:b44aebdb4d65 76 led1 = !led1;
nightseas 0:b44aebdb4d65 77 }
nightseas 0:b44aebdb4d65 78 }
nightseas 0:b44aebdb4d65 79 }