- SOP pins are configured to enable SWD (Single Wire Debug).
- Debug lines are disconnected from on board FTDI debugger. External debugger is connected to freed debug pins via 3 lines SWDIO(TMS), SWDTCK(TCK) and GND. Let's not get into why 3 lines are needed for Single Wire Debug :).
I stopped boot in endless loop after connecting to it. I made simple while(1) empty loop project. Downloaded it to beginning of the RAM (0x20000000) and it worked.
I'm still not sure about clock settings. It doesn't seem that any PLL needs initializing...
[UPDATE]
I did sample project without any PLL code and it worked.
Also I didn't get SWO (Single Wire Output) to generate any output from ITM (Instrumentation Trace Macrocell). I know ITM was configured properly because it worked on some other devices. That only leaves IO configuration which I did with enabling GPIO3CLKEN clock, configuring corresponding GPIO_PAD_CONFIG_24 and set pin as output by setting GPIOA3[0]. Scope didn't show anything on TDO pin when writing ITM stimulus registers. Did anyone manage to get trace output ?
[UPDATE]
I added following code to initialize SWO pin without success:
PRCMPeripheralClkEnable(PRCM_GPIOA3, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK | PRCM_DSLP_MODE_CLK);
PinModeSet(PIN_17, PIN_MODE_1);
PinConfigSet(PIN_17, PIN_STRENGTH_6MA, PIN_TYPE_STD);
PinDirModeSet(PIN_17, PIN_DIR_MODE_HW);
It works! Apparently TDO is not the pin to get SWO out. Pins 45, 53 and 50 are according to CC3200 forum. Anyway, connecting iTag to 53 and adding code below did the trick.
PinModeSet(PIN_53, PIN_MODE_13);
[UPDATE]
I did sample project without any PLL code and it worked.
Also I didn't get SWO (Single Wire Output) to generate any output from ITM (Instrumentation Trace Macrocell). I know ITM was configured properly because it worked on some other devices. That only leaves IO configuration which I did with enabling GPIO3CLKEN clock, configuring corresponding GPIO_PAD_CONFIG_24 and set pin as output by setting GPIOA3[0]. Scope didn't show anything on TDO pin when writing ITM stimulus registers. Did anyone manage to get trace output ?
[UPDATE]
It works! Apparently TDO is not the pin to get SWO out. Pins 45, 53 and 50 are according to CC3200 forum. Anyway, connecting iTag to 53 and adding code below did the trick.
PinModeSet(PIN_53, PIN_MODE_13);
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| CC3200-LAUNCHXL + iTAG |
[UPDATE]
Created Eclipse C projects for CC3200 libs are available in repository. Short note for building: download CC3200 SDK separately (or extract from CCS installation). Library folders contain RefreshFiles.bat script invoked with CC3200 path to copy needed files to project folder.
While playing with integrated HTTP server I got frustrated with constant terminal to Uniflash tool UART switching. I decided to use UART Tx pin multiplexed with JTAG, which was not used since I'm using SWD.
To utilize it I added FTDI MM232R USB to serial module. I only connected CC3200 Tx to MM232R Rx for printf() tracing. Unconnected pin on LAUNCHPAD debug pinhead (J11) could be used for sending serial data to CC3200.
Code for UART initialization:
#define PRCM_UART_TERM PRCM_UARTA1
#define PIN_TERM_TX PIN_16
#define PIN_TERM_TX_MODE PIN_MODE_2
#define PIN_TERM_RX PIN_17
#define PIN_TERM_RX_MODE PIN_MODE_2
#define UART_TERM UARTA1_BASE
#define PRCM_UART_TERM PRCM_UARTA1
PinTypeUART(PIN_TERM_TX, PIN_TERM_TX_MODE);
UARTConfigSetExpClk(UART_TERM,
MAP_PRCMPeripheralClockGet(PRCM_UART_TERM),
115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));
and code for sending single character:
UARTCharPut(UART_TERM, ch);
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| CC3200-LAUNCHXL + iTAG + MM232R |
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| CC3200-LAUNCHXL to MM232R closeup |
Soon after I realized I can capture serial data with iTAG debugger since SWD leaves pins for capturing SWO and iTAG can be configured to dump UART data from that pin to terminal window.
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| CC3200-LAUNCHXL + iTAG with UART capturing |
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| CC3200-LAUNCHXL + iTAG with UART capturing (iTAG closeup) |
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| CC3200-LAUNCHXL + iTAG with UART capturing (LAUNCHPAD closeup) |
Programming SPI flash without Uniflash through debug port
With setup above updating the SPI flash content still requires disconnecting the debug session, switching SOP jumper to 'FLASH' position and resetting the board to program files with TI Uniflash tool.For development purposes I wrote small monitor application to run on CC3200 and Python script controlling the execution of the monitor through debugger to write files to SPI flash, e.g. write file data to CC3200 RAM and trigger function calling SimpleLink lib to write the data to file. Scripting is supported by winIDEA, IDE used with iTAG debugger and iSYSTEM.Connect API. My intention was to first format the flash and then program all files in specified folder. It turned out that formatting is not supported by library (only Uniflash tool). As workaround first SPI flash must be erased on low (SPI) level, then formatted with Uniflash tool and all data from flash read to be later used as "empty" image. This is done once. SPI access is provided in the script. Later on every update of the files the script erases the flash, programs "empty" image to it and then calls SimpleLink lib to create and write files. See script for more details.
Recording ITM printf() messages on SWO
Tested on pin 53 as mentioned in update above. Don't get confused by the photo below. I'm using white wire for SWO. SWO is configured by debugger to output at 4Mbits/second. CPU speed and SWO prescaler settings in winIDEA must be configured for this. Following equation applies: BAUD = CPUclk/(SWOprcs + 1) -> 80MHz/(19 + 1) = 4MHz.
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| White wire connected from pin 53 configured as SWO to TDO input on iTag |
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| 4M BAUD configured in winIDEA |
