Hello,
Is there any tutorial / example or application note on using External SRAM with EMC and RTX ?
I'm using a LPC2378 and I have the RLARM library. The problem is that I need 40kRAM to get my program working but there's only 32kRAM inside. So I connected 64kRAM with the EMC module. But I don't understand how to get the EMC working with the RTOS.
kind regards, Wim
this is not an RTX problem - RTX can run with or without external memory. check your EMC settings/RAM data sheet - they should not change whether you use RTX or not.
1 - Get your EMC working 2 - Configure the project to use the memory range covered by the external RAM
I have this in my startupcode:
;----------------------- External Memory Controller (EMC) Definitons ----------- EMC_BASE EQU 0xFFE08000 ; EMC Base Address EMC_CTRL_OFS EQU 0x000 ; EMCControl EMC_STAT_OFS EQU 0x004 ; EMCStatus EMC_CONFIG_OFS EQU 0x008 ; EMCConfig EMC_STA_CFG0_OFS EQU 0x200 ; EMCStaticConfig0 EMC_STA_WWEN0_OFS EQU 0x204 ; EMCStaticWaitWen0 EMC_STA_WOEN0_OFS EQU 0x208 ; EMCStaticWaitOen0 EMC_STA_WRD0_OFS EQU 0x20C ; EMCStaticWaitRd0 EMC_STA_WPAGE0_OFS EQU 0x210 ; EMCStaticWaitPage0 EMC_STA_WWR0_OFS EQU 0x214 ; EMCStaticWaitWr0 EMC_STA_WTURN0_OFS EQU 0x218 ; EMCStaticWaitTurn0 EMC_STA_CFG1_OFS EQU 0x220 ; EMCStaticConfig1 EMC_STA_WWEN1_OFS EQU 0x224 ; EMCStaticWaitWen1 EMC_STA_WOEN1_OFS EQU 0x228 ; EMCStaticWaitOen1 EMC_STA_WRD1_OFS EQU 0x22C ; EMCStaticWaitRd1 EMC_STA_WPAGE1_OFS EQU 0x230 ; EMCStaticWaitPage1 EMC_STA_WWR1_OFS EQU 0x234 ; EMCStaticWaitWr1 EMC_STA_WTURN1_OFS EQU 0x238 ; EMCStaticWaitTurn1 EMC_STA_EXT_W_OFS EQU 0x880 ; EMCStaticExtendedWait BUFEN_Const EQU (1 << 19) ; Buffer enable bit EMC_PCONP_Const EQU (1 << 11) ; PCONP val to enable power for EMC ; External Memory Pins definitions ; pin functions for external memory interfacing EMC_PINSEL6_Val EQU 0x00005555 ; D0 .. D7 EMC_PINSEL8_Val EQU 0x55555555 ; A0 .. A15 EMC_PINSEL9_Val EQU 0x50090000; ; !OE, !WE (BLS0 because of errata), !CS0, !CS1 ;// External Memory Controller Setup (EMC) --------------------------------- ;// <e> External Memory Controller Setup (EMC) EMC_SETUP EQU 1 EMC_CTRL_Val EQU 0x00000001 EMC_CONFIG_Val EQU 0x00000000 EMC_STACS0_SETUP EQU 1 EMC_STA_CFG0_Val EQU 0x00000000 EMC_STA_WWEN0_Val EQU 0x00000009 EMC_STA_WOEN0_Val EQU 0x0000000A EMC_STA_WRD0_Val EQU 0x0000001F EMC_STA_WPAGE0_Val EQU 0x0000001F EMC_STA_WWR0_Val EQU 0x0000001F EMC_STA_WTURN0_Val EQU 0x0000000F EMC_STA_EXT_W_Val EQU 0x00000013
and this in my task init()
PCONP |= (1 << 11); PINSEL6 &= ~0x0003FFFF; PINSEL6 |= 0x00015555; PINSEL8 &= ~0xFFFFFFFF; PINSEL8 |= 0x55555555; PINSEL9 &= ~0xF00F0000; PINSEL9 |= 0x50090000;
I'm using www.amictechnology.com/.../A623308.pdf SRAM
I think the system crashes when it wants to write to the external RAM.
OMG :x
I made a huge beginner mistake here.
I installed 64kbit RAM instead of 64kByte RAM.
Embarrising lol
Thank you for supplying the reason for your problem.