A couple of times, I have seen complaints that programming the Texas instruments with a launchpad has the complication of doing it all in ASM, which is a very cryptic language, unlike C.
People have gotten around this by using Energia, a AVR-Style compiler designed for the launchpad.
I would like to know: Is it possible to use the Arduino board as an in-system-programmer for JUST the Texas Instruments MCU?
I want to be able to program an MSP430, like like I would program an external Atmel Chip.
There are many c compiler option for the msp430. CCS Texas Instruments C/C++ compiler, IAR has a commercial compiler and then there is the free msp430-gcc c/c++ compiler. TI provides samples in C. Energia is an Arduino port of the msp430. It implements an Arduino API, most straight Arduino code just works. The launchpad device https://estore.ti.com/MSP-EXP430G2-MSP430-LaunchPad-Value-Line-Development-kit-P2031.aspx
is $10. It is equivalent to buying an AVR dragon. It is both a programmer and a hw debugger. There is no reason to use asm unless you want to.
If you want to go into the larger chips. There are many other options. All of them can be programmed in C or C++.
There is no reason to use an ISP with the msp430 chips. You can get a real hardware debugger / programmer usb device for less than the cost of an FTDI module.
TI code examples for the msp430g2553 http://www.ti.com/product/msp430g2553#softTool
Energia forum: http://forum.43oh.com/forum/28-energia/