76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
#include <sysinit.h>
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#include "usbcdc/usb.h"
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#include "usbcdc/usbcore.h"
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#include "usbcdc/cdc_buf.h"
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#include "usbcdc/usbhw.h"
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#include "usbcdc/cdcuser.h"
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#include "basic/basic.h"
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volatile unsigned int lastTick;
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// There must be at least 1ms between USB frames (of up to 64 bytes)
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// This buffers all data and writes it out from the buffer one frame
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// and one millisecond at a time
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int puts(const char * str){
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if(!USB_Configuration)
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return -1;
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while(*str)
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cdcBufferWrite(*str++);
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//XXX: This assumes systick is 1ms, which it isn't for us.
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// this makes usbserial unnecessary slow. Ah well....
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// Check if we can flush the buffer now or if we need to wait
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unsigned int currentTick = systickGetTicks();
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if (currentTick != lastTick){
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uint8_t frame[64];
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uint32_t bytesRead = 0;
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char repeat=0;
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while (cdcBufferDataPending()){
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// Read up to 64 bytes as long as possible
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bytesRead = cdcBufferReadLen(frame, 64);
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USB_WriteEP (CDC_DEP_IN, frame, bytesRead);
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if(repeat)
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systickDelay(1);
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else
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repeat=1;
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}
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lastTick = currentTick;
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}
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return 0;
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}
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int puts_plus(const char * str){
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if(!USB_Configuration)
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return -1;
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while(*str)
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cdcBufferWrite(*str++);
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return 0;
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}
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void usbCDCInit(){
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lastTick = systickGetTicks(); // Used to control output/printf timing
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CDC_Init(); // Initialise VCOM
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USB_Init(); // USB Initialization
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USB_Connect(TRUE); // USB Connect
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/* You could wait until serial is connected. */
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#if 0 // We don't
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uint32_t usbTimeout = 0;
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while ( usbTimeout < CFG_USBCDC_INITTIMEOUT / 10 ) {
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if (USB_Configuration) break;
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delayms(10); // Wait 10ms
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usbTimeout++;
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}
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#endif
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}
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void usbCDCOff(void){
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USB_Connect(FALSE);
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}
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