crashtest-r0ket/firmware/usbcdc/util.c

63 lines
1.7 KiB
C

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