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TMS320F28388D: EMIF1访问SDRAM双映射问题

Part Number: TMS320F28388D


使用F28388D的emif访问SDRAM的时候发现同步模式下的内存区间有:

也就是CS0n有两个地址段,双映射的。发现0x0020 0000段可以通过#program进行写访问,但是0x8000 0000内存段不能用#program进行访问,但是用指针可以进行读写访问。

static float_t s_rDataValue[MAX_DATALEN];               
static float_t s_rDataBufValue[MAX_DATABUFLEN];         
uint32_t g_ulChannelIndex[MAX_CHANNEL];                 
#pragma DATA_SECTION(s_rDataValue,"emif1_cs0");
#pragma DATA_SECTION(s_rDataBufValue,"emif1_cs0");
#pragma DATA_SECTION(g_ulChannelIndex,"emifcs0");

cmd部分:
   emifcs0 : > EMIF1_CS0n, type=NOINIT
   emif_cs0_nonfar  : > EMIF1_CS0_CS2n
   .farbss          : > EMIF1_CS0n
   .farconst        : > EMIF1_CS0n
   .em1_cs0         : > EMIF1_CS0n
   .em1_cs2         : > EMIF1_CS2n | EMIF1_CS0_CS2n
   .em1_cs3         : > EMIF1_CS3n
   .em1_cs4         : > EMIF1_CS4n
   .em2_cs0         : > EMIF2_CS0n
   .em2_cs2         : > EMIF2_CS2n

也就是g_ulChannelIndex直接赋值是没有办法的。

但是如果定义一个指向0x8000 0000的指针,是可以对指针赋值的。

您好是有相关的配置要求还是0x8000 0000段就不支持#program的方式呢?

  • 你好,为你将问题升级到英文E2E论坛了,还请留意以下帖子的回复:

    https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1030099/tms320f28388d-emif1-access-to-sdram-dual-mapping-problem