SPI failure in case of modifications to unrelared code segment

Question

Hi everyone, 
 I am using nrf52832 with SDK version 11.0 for an IoT application. I am communicating with Atmel ATWINC 1500 module through SPI in order to connect to Wifi. My code was working fine until I added few new lines of code unrelated to SPI. Now when I run the project on Nordic hardware I get following SPI read errors. 
 (APP)(ERR)[spi_data_read][385][nmi spi]: Failed data response read...(00)
(APP)(ERR)[spi_read_reg][625][nmi spi]: Failed data read... 
 I know that this error occurs when there is some issue with pin assignment for SPI interface but I have verified all the pin assignments. The stranger thing is that the project starts working fine if I comment out any part of the project totally unrelated with SPI . Following are the results when I compile the project using Eclipse. 
 'C:/Program Files (x86)/GNU Tools ARM Embedded/5.4 2016q3/bin/arm-none-eabi-size' _build/nrf52832_xxaa.out
text data bss dec hex	filename
56312 1436 37904 95652 175a4	_build/nrf52832_xxaa.out 
 It might be a memory issue or some other issue. I have tried debugging it but failed so any leads or suggestion about where the problem might be or how to debug such an issue will be highly appreciated. My Make file and start up file is attached. 
 arm_startup_nrf52.s 
 Makefile

bjorn-spockeli · Accepted Answer

Are you using the heap in your project? If not then you can set the heap size to zero by adding the following assembler flag. 
 ASMFLAGS += -D__HEAP_SIZE=0
 
 If __HEAP_SIZE is not defined, then it will be by default set to 8192, i.e. 8kB. You should be able to increase the stack size by setting the heap size to zero.

SPI failure in case of modifications to unrelared code segment

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