neil hancock / Mbed 2 deprecated kl25z_Usb_Logger

Logger to USB stick running on KL25Z

Dependencies:   F401RE-USBHost FastAnalogIn RTC mbed tsi_sensor2 mbed-rtos2

Fork of ReadSendData by Stuart Scott

Homepage for kXX_logger(was kl25x_usb_logger)

2014Nov12 - Added TSI - only works for kl25z, and fails after 4287seconds

Tests sequences for freezing 4287seconds 4287 4287 - Changed to USB write update every two seconds and lasted 4283seconds. Added mbed TSI_sensor - kudos to mbed as it turns out to be complex to do capacitive touch sensing. Kinetis L series Cortex-M0 (kl25z) has simpler capacitive sensing hardware which mbed/TSI_sensor lib uses, but doesn't support Cortex-M4 versions. K20D is older more complex interface. TSS hasn't had an open source support by Freescale in the past however that has changed. Currently I found KDS1.1.1 has a Processor Expert TSSlib that can be imported - but I'm getting a weird compile/include error - and not found any examples of how to make it work.

2014Oct05 - Published simple kl25z_usb_logger

Testing: Version (2:f06fbf86887e) has run over 28days starting 2014Sept07, reading a sensor data every seconds and then on the USB stick open file, write record, close file

This is over 2,419,200seconds ( 28days*24hrs*3600seconds) The stick data reflected 2,447,633 seconds, but only had 1,776,366 data records. After 407,650 data records started missing updates - analysis: the file could not be opened and read to the end in the allocated 1 second, and therefore missed the next ADC deadline.

By the end of the test period with 1,776,366 records on the USB Stick, ever read then write was causing it to miss two/three ADC updates - ie taking longer than two seconds.

Analysis: this was an aggressive test, and normally would not be opening, writing, closing every 1 second. However big plus the file mechanism held up and the program continued to operate, with a graceful failure of a missed ADC readings. The output used JSON, which reads nicely but turns out not to be supported by Excel (2014?) I was using.

Conclusion: Overall the USB Mechanisms and file read is stable. However the USB stack used doesn't have an event based management for stick insertion and removal, or OTG power management . This KL25Z has been a very useful test to prove the configuration of clocks for USB Stack is possible and stable. The target processor being looked at is the MK20 and is similar in clocks, but slightly more comprehensive USB OTG Next step is to investigate the full Freescale Kinetis USB OTG Stack with power management on a custom K20 board, using Kinetis Design Studio, and very low power capability.

Example https://github.com/ErichStyger/mcuoneclipse/tree/master/Examples/FRDM-K20D50M/FRDM-K20_MSD_Host http://mcuoneclipse.com/2014/10/25/usb-cdc-with-the-frdm-k64f-finally/#comment-37727 - Commentary on Freescale USB versions

/*
Custom board descriptions
*/
#ifdef BOARD_CUST_H
#define BOARD_CUST_H
/* CustomMK20DX128
   Customer Visible interfaces - NH B022_Rev1

  //R-Bridge sensor
   DacOut   senseRaDrv (connected electrically ADC_DP0)
   ADC0_DP0 adcDiffInP0
   ADC0_DM0 adcDiffInP1 senseRbAdcP

   ptB1 adcIn adcTemperature1
   ptB2 adcIn adcTemperature2
   ptB0 adcIn adcAir   
   ptB16 out CustLedRed
   ptB17 out CustLedGrn
   ptB18 cap  capSens1
   ptB19 cap  capSens2
*/

/* Internal LiIon management interfaces
  ptA13 digOut enExtBat
  ptB3     adcIn adcVrechargeBat
  ADC0_DP3 adcIn adcRbatP
  ADC0_DM3 adcIn adcRbatM
  
  ptc0  adcIn adc10Vbat 
  ptC1 spare
  */
  /* External Power Management 
  ptC2 adcIn adcVextIn
  ptC8  adcIn adc10Vslr
*/

/* Serial North Bound Interfaces
 Shared Uart1Tx Halfduplex
  enSdiTx
  enSdiRx
  enWire1Tx
  enWire1Rx
*/

/* USB OTG 
   Vusb  (input to cmpUSB
   UsbDM
   UsbDP
   UsbOtg_Id
*/

/* External Two FLASH chips.
   ptc3 C4 C5 C6 C7
*/

/*Debug Serial Interafaces
either JTAG or openSDA
 ptA0 SWD_CLK
 pta1 Uart0RxDebug
 pta2 Uart0RxDebug
 pta3 SWD_DI0
*/


#endif // BOARD_CUST_H