Access to LPC1788 External SRAM with Linker Script

Eugene723 — Wed, 20 Sep 2023 19:18:07 GMT

I work with a board that has two 1MB SRAM (CY7C1051DV33) chips connected via CS0 (address: 0x8000 0000) and CS1 (address: 0x9000 0000). These memories are declared in settings:

Is this correct? Can external RAM be used this way:

uint8_t __attribute__ ((section("RW_RAM0"))) myLargeData[500000];

As opposite to:

#define LPC_STAT_CS0_BASE 0x80000000UL

volatile uint8_t *myLargeData = (uint8_t *) LPC_STAT_CS0_BASE;

The reason I want to avoid the latter way is that I have multiple variables so I would have to assign each one individually:

volatile uint32_t * myFirstInteger = (uint32_t *)( LPC_STAT_CS0_BASE + 500000 );

volatile uint32_t * mySecondInteger = (uint32_t *)( LPC_STAT_CS0_BASE + 500004 );

volatile uint32_t * myThirdInteger = (uint32_t *)( LPC_STAT_CS0_BASE + 500008 );

and so forth.

Thank you,

Eugene

Re: Access to LPC1788 External SRAM with Linker Script

Alice_Yang — Mon, 25 Sep 2023 07:16:53 GMT

Hello @Eugene723

You can refer to:

https://community.nxp.com/t5/MCUXpresso-IDE/Placing-data-in-external-RAM-LPC4088-MCUXpresso/m-p/726903

Alice

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Access to LPC1788 External SRAM with Linker Script

Re: Access to LPC1788 External SRAM with Linker Script