This function reads the pull mode from HW and can then be used
to avoid over-writing the previously set pull-up / pull-down modes.
This is done following reported issue: #2638
Decrease the minimum space reserved for the heap from 16K down to
2K for GCC. This does not have an effect on the actual heap size since
the heap takes up all free RAM. This just allows code to compile in
configurations where the heap is smaller than 16K.
Bugs are as below.
- In the case of MTU2 mode, modify a problem that does not excute "pwmout_write ()" at the end of "pwmout_pulsewidth_us ()" function.
- In the case of MTU2 mode in "pwmout_period_us ()" function, modify a problem that the executing result of "set_mtu2_duty_again ()" function does not reflect in the register of TGRA_MATCH [] and TGRC_MATCH [].