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Migration Problem using SDRAM on STM32F429 Discovery

Question asked by Embedded Engineer on May 17, 2017
Latest reply on May 17, 2017 by Clive One



I have already started implementing my application on an STM32F429-Discovery Board. Today, I received my custom pcb which uses the same SDRAM (ISSI IS42S16400J) with a slightly different configuration/pinout.


Instead of using SDNE1 and SDNCKE1 (PB5/6), I am using SDNE0 and SDNCKE0. 


At the very start of the project, I am planning to use the discovery board source files. In order to get everything up and running on my board, I adjusted the pin configuration in the stm32f429i_discovery_sdram.c to use my pinout. Below, the relevant lines of code are shown. (The complete file can be downloaded from st's website)


/*-- GPIOs Configuration -----------------------------------------------------*/
| PC3 <-> FMC_SDCKE0|
| PC2 <-> FMC_SDNE0 |
| PC0 <-> FMC_SDNWE |



/* GPIOC configuration */
GPIO_InitStructure.Pin = GPIO_PIN_0|GPIO_PIN_2|GPIO_PIN_3;
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);


However, I get HardFault_Handler errors. I am assuming that something is going wrong in the init process. 


My question is: From the datasheet I've been assuming that SDNE and SDCKE are only select signals; meaning that I only have to change the pins, but do not have to touch the address space and other init routines. Am I totally wrong or can anyone guess what I have overlooked?