# SAM-BA works only once !

**URL:** <https://community.sparkfun.com/t/sam-ba-works-only-once/26920>\
**Category:** MicroMod\
**Tags:** arm-lpc\
**Created:** [June 13, 2013, 8:06am UTC](https://community.sparkfun.com/t/sam-ba-works-only-once/26920 "2013-06-13T08:06:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![yahya\_tawil](https://avatars.discourse-cdn.com/v4/letter/y/e47774/32.png) [@yahya\_tawil](https://community.sparkfun.com/u/yahya_tawil)\
**Post date:** [June 13, 2013, 8:06am UTC](https://community.sparkfun.com/t/sam-ba-works-only-once/26920/1 "2013-06-13T08:06:36Z")

</div>

I’m using now SAM\_I\_AM and freesba as SAM-BA monitor/client on my computer (host) . every time I erase my chip using ERASE pin and reflash SAM-BA bootloader using TST pin , monitor successes and communicate with SAM-BA , but most of time when I replug the usb cable it fails to communicate , and I need to reflash SAM-BA again . some times while the same session it fails .

any help ?!

P.S: my old topic would help :

[http://www.at91.com/forum/viewtopic.php/f,15/t,21642/](http://www.at91.com/forum/viewtopic.php/f,15/t,21642/)

and I had lots of info of my chip( crystal - usb - registers …) I get them when I communicate using SAM\_I\_AM ans freesba programs , but they need an expert (not a beginner like me 🙂 ) to understand what happed :

> Bus 004 Device 023: ID 03eb:6124 Atmel Corp. at91sam SAMBA bootloader
> 
> --------------freesba monitor------------------
> 
> yahya@Notebook-PC:~$ freesba -i /dev/ttyACM0 -b 115200
> 
> Type ‘help’ to view list of supported commands
> 
> or ‘help ’ to view command’s help
> 
> SAM-BA\> open
> 
> SAM-BA\> info
> 
> Port: /dev/ttyACM0 opened.
> 
> Baud: 115200.
> 
> Protocol: RAW
> 
> SAM-BA\> show id
> 
> Identification
> 
> CIDR = 0x270C0740
> 
> Version: 0
> 
> Processor: ARM7TDMI
> 
> NVP Type: Embedded Flash
> 
> NVP Size: 128K
> 
> NVP2 Size: None
> 
> SRAM Size: 128K
> 
> Architecture: AT91SAM7Sxx
> 
> Extended CIDR no
> 
> AT91SAM7S128 detected.
> 
> Flash page size used: 256
> 
> SAM-BA\> show id
> 
> Identification
> 
> CIDR = 0x270C0740
> 
> Version: 0
> 
> Processor: ARM7TDMI
> 
> NVP Type: Embedded Flash
> 
> NVP Size: 128K
> 
> NVP2 Size: None
> 
> SRAM Size: 128K
> 
> Architecture: AT91SAM7Sxx
> 
> Extended CIDR no
> 
> AT91SAM7S128 detected.
> 
> Flash page size used: 256
> 
> SAM-BA\> help show
> 
> Usage:
> 
> show [id | efc]
> 
> Show various parameters.
> 
> id - Show CID register.
> 
> efc - Show Embedded Flash Controller Status.
> 
> SAM-BA\> show efc
> 
> Embedded Flash Controller (EFC)
> 
> FMR = 0x00340100
> 
> Flash Status: BUSY
> 
> Errors: PROGE: 0 LOCKE: 0
> 
> Erase Before Programming: YES
> 
> Flash Wait State:
> 
> Read: 2 cycles
> 
> Write: 3 cycles
> 
> Flash Microsecond Cycle Number: 52
> 
> FSR = 0x00030001
> 
> Flash Status: READY
> 
> Errors: PROGE: 0 LOCKE: 0
> 
> Security bit: Inactive
> 
> General-purpose NVM
> 
> GPNVM0: 0 BOD: Disabled
> 
> GPNVM1: 0 BOD Reset: Disabled
> 
> GPNVM2: 0 Memory: Flash/SRAM
> 
> LOCKS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
> 
> 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 
> SAM-BA\> show id
> 
> Identification
> 
> CIDR = 0x270C0740
> 
> Version: 0
> 
> Processor: ARM7TDMI
> 
> NVP Type: Embedded Flash
> 
> NVP Size: 128K
> 
> NVP2 Size: None
> 
> SRAM Size: 128K
> 
> Architecture: AT91SAM7Sxx
> 
> Extended CIDR no
> 
> AT91SAM7S128 detected.
> 
> Flash page size used: 256
> 
> SAM-BA\> help read
> 
> Usage:
> 
> read
> 
> Read a word from the given address. The address must be word-aligned.
> 
> SAM-BA\> read 2000
> 
> 0x00490849
> 
> SAM-BA\> open
> 
> SAM-BA\> info
> 
> Port: /dev/ttyACM1 opened.
> 
> Baud: 115200.
> 
> Protocol: RAW
> 
> SAM-BA\> flash 0x00100000 AT91SAM7\_P64\_blinking\_led.BIN
> 
> Detecting microcontroller: 0x270C0740
> 
> Version: 0
> 
> Processor: ARM7TDMI
> 
> NVP Type: Embedded Flash
> 
> NVP Size: 128K
> 
> NVP2 Size: None
> 
> SRAM Size: 128K
> 
> Architecture: AT91SAM7Sxx
> 
> Extended CIDR no
> 
> AT91SAM7S128 detected.
> 
> Loading sambaflash
> 
> Sending data to RAM using RAW protocol with block size 128 bytes.
> 
> Bytes: 1720, Blocks: 14
> 
> Sending Block 14 / 14 Finished
> 
> Programming Flash with page size 256
> 
> Bytes: 688, Pages: 3
> 
> Programming page 3 / 3
> 
> Finished
> 
> --------------SAM\_I\_AM monitor------------------
> 
> info usb
> 
> UDP\_GLB\_STAT: 00000002
> 
> Device in address state: false
> 
> Device configured: true
> 
> Send resume enabled: false
> 
> Resume sent to host: false
> 
> Remote wake-up enable: false
> 
> UDP\_FADDR: 0000011B
> 
> Function address: 27 Function enabled: true
> 
> UDP\_IMR: 00001200
> 
> Interrupts enabled:
> 
> Endpoint 0: false Endpoint 1: false Endpoint 2: false Endpoint 3: false
> 
> Suspend: false Resume: true External resume: false Start-of-frame: false
> 
> Bus wakeup: false
> 
> Endpoint 0 (UDP\_CSR0: 00088000)
> 
> Enabled: true Endpoint type: control
> 
> Data IN ACK: false Data in bank 0: false Data in bank 1: false
> 
> Received data count: 8
> 
> Setup packet available: false Stall acknowledged: false
> 
> Transmitter ready: false
> 
> Transfer direction: OUT
> 
> Endpoint 1 (UDP\_CSR1: 00008A00)
> 
> Enabled: true Endpoint type: bulk OUT
> 
> Data IN ACK: false Data in bank 0: false Data in bank 1: false
> 
> Received data count: 0
> 
> Stall acknowledged: false
> 
> Transmitter ready: false
> 
> Endpoint 2 (UDP\_CSR2: 00008600)
> 
> Enabled: true Endpoint type: bulk IN
> 
> Data IN ACK: false Data in bank 0: false Data in bank 1: false
> 
> Received data count: 0
> 
> Stall acknowledged: false
> 
> Transmitter ready: false
> 
> Endpoint 3 (UDP\_CSR3: 00008500)
> 
> Enabled: true Endpoint type: isochronous IN
> 
> Data IN ACK: false Data in bank 0: false Data in bank 1: false
> 
> Received data count: 0
> 
> CRC error: false
> 
> Transmitter ready: false
> 
> PMC\_SCSR: 00000081
> 
> Processor clock: ENABLED USB clock: ENABLED
> 
> Programmable clocks: 0: disabled 1: disabled 2: disabled
> 
> PMC\_PCSR: 00000800
> 
> Peripheral clocks:
> 
> AICFIQ: disabled SYSIRQ: disabled PIOA: disabled ADC: disabled
> 
> SPI: disabled USART0: disabled USART1: disabled SSC: disabled
> 
> TWI: disabled PWMC: disabled UDP: ENABLED TC0: disabled
> 
> TC1: disabled TC2: disabled AICIRQ0: disabled AICIRQ1: disabled
> 
> CKGR\_MOR: 00004001
> 
> Main oscillator: ENABLED Oscillator bypass: disabled
> 
> Oscillator startup: 64 slow clock cycles
> 
> CKGR\_MCFR: 000127BE
> 
> Clock cycles in 16 slow clock periods: 10174
> 
> Slow clock is 28.987 kHz if main clock is 18.432 MHz
> 
> Main clock ready: true
> 
> CKGR\_PLLR: 10483F0E
> 
> PLL DIV: 14 MUL: 72 USBDIV: 1 OUT: 0
> 
> PLL frequency: 96.110 MHz (assuming 18.432 MHz oscillator)
> 
> USB frequency: 48.055 MHz
> 
> PMC\_MCKR: 00000001
> 
> Master clock: main clock Prescale: divide-by-1
> 
> Device is operating at 18.4 MHz
> 
> PMC\_PCK0: 00000000 PMC\_PCK1: 00000000 PMC\_PCK2: 00000000
> 
> Programmable clock 0: slow clock Prescale: divide-by-1
> 
> Programmable clock 1: slow clock Prescale: divide-by-1
> 
> Programmable clock 2: slow clock Prescale: divide-by-1
> 
> PMC\_SR: 0000000D
> 
> Main oscillator stable: true PLL locked: true Master clock ready: true
> 
> Programmable clocks ready: 0: false 1: false 2: false
> 
> PMC\_SR: 0000000D
> 
> Main oscillator stable: true PLL locked: true Master clock ready: true
> 
> Programmable clocks ready: 0: false 1: false 2: false
> 
> PMC\_IMR: 00000000
> 
> Interrupts enabled:
> 
> Main oscillator status: false
> 
> PLL lock: false
> 
> Master clock ready: false
> 
> Programmable clock ready: 0: false 1: false 2: false
> 
> * * *
> 
> version
> 
> v1.4 Nov 10 2004 14:49:33
> 
> * * *