Content originally posted in LPCWare by pockpock on Mon Jul 14 14:44:18 MST 2014 Hi,
I'm currently using two LPC Link2s: one for programming/debugging and the other one as a target as described in the FAQ [1]. The blink example works as expected and so I moved on to a more complex test: I tried using the pins at the J6 port. For this purpose I used the schematic of the embedded artists homepage [2].
Some of the buffers are permanently configured as an output (TCK, TDI), some are configured as input (RTCK, TDO) while others can be configured (RESET, TMS).
This is the list of GPIO positions and settings I created reading the schematic and LPC43xx reference manual:
I've been able to use all of them except the RESET line, even though I only changed the pins. i.e the following code works (TMS oscillates @100Hz):
#define PORT 1
#define DIR (1<<8)
#define SIG (1<<9)
...
GPIO_SetDir(PORT, DIR, 1);
GPIO_SetDir(PORT, SIG, 1);
GPIO_SetValue(PORT, DIR);
while(1) {
GPIO_SetValue(PORT, SIG);
systick_delay(5);
GPIO_ClearValue(PORT, SIG);
systick_delay(5);
}
But the same code with following defines doesn't (RESET stays high the entire time).
#define PORT 5
#define DIR (1<<6)
#define SIG (1<<5)
I checked for a hardware defect by using the same LPC Link 2 as a debug probe and pulling the RESET pin low/high from LPCXpresso IDE, which worked. Did I miss something? How can I use the RESET pin?
Content originally posted in LPCWare by pockpock on Thu Aug 07 04:58:28 MST 2014 I got the reset pin working now. I missed the fact that some of the GPIO pins' (including P2_5=GPIO5.5 and P2_6=GPIO5.6) "Function 0" was not GPIO but SGPIO, in my case. After changing it to the appropriate function number, it worked. In addition to the above settings I had to do the following:
