为 32MB SDRAM 配置 LPC4357 EMC
Config LPC4357 EMC for 32MB SDRAM
我正在使用 uVision KEIL MDK 5.22 和 LPC4357 (CortextM4F 204MHz)。
我想配置 LPC4357 的 EMC（外部内存控制器）来驱动 IS42S32800J-6TL SDRAM。这是一个 256Mbit 2Meg X 32 X 4 banks sdram with 32bit data bus.
我的问题是我不能使用这个 SDRAM 的全部 32MByte；只有我可以驱动它的 16MBytes。换句话说，我可能使用 16MByte sdram
我的目标是驱动具有最大性能和大小的 sdram（204MHz 的 MCU 和 102MHz 速度的 SDRAM）。
我正在使用具有以下源的 KEIL system_LPC43xx.c 启动文件。
我的配置有什么问题，我不能正确使用这个 SDRAM。有时它也无法正常工作。 （我使用 lpcopen memtest 来测试我的 sdram）。有没有人有这个 ram 或类似的配置。
MCU时钟配置：
/*----------------------------------------------------------------------------
This file configures the clocks as follows:
-----------------------------------------------------------------------------
Clock Unit | Output clock | Source clock | Note
-----------------------------------------------------------------------------
PLL0USB | 480 MHz | XTAL | External crystal @ 12 MHz
-----------------------------------------------------------------------------
PLL1 | 204 MHz | XTAL | External crystal @ 12 MHz
-----------------------------------------------------------------------------
CPU | 204 MHz | PLL1 | CPU Clock == BASE_M4_CLK
-----------------------------------------------------------------------------
IDIV A | 160 MHz | PLL0USB | For 80/40MHz SPIFI
-----------------------------------------------------------------------------
IDIV B | 25 MHz | ENET_TX_CLK | ENET_TX_CLK @ 50MHz
-----------------------------------------------------------------------------
IDIV C | 40 MHz | IDIV A | To SPIFI
-----------------------------------------------------------------------------
IDIV D | 102 MHz | PLL1 | For 102MHz core/SPIFI
-----------------------------------------------------------------------------
IDIV E | 5.3 MHz | PLL1 | To the LCD controller
-----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Clock source selection definitions (do not change)
*----------------------------------------------------------------------------*/
#define CLK_SRC_32KHZ 0x00
#define CLK_SRC_IRC 0x01
#define CLK_SRC_ENET_RX 0x02
#define CLK_SRC_ENET_TX 0x03
#define CLK_SRC_GP_CLKIN 0x04
#define CLK_SRC_XTAL 0x06
#define CLK_SRC_PLL0U 0x07
#define CLK_SRC_PLL0A 0x08
#define CLK_SRC_PLL1 0x09
#define CLK_SRC_IDIVA 0x0C
#define CLK_SRC_IDIVB 0x0D
#define CLK_SRC_IDIVC 0x0E
#define CLK_SRC_IDIVD 0x0F
#define CLK_SRC_IDIVE 0x10
/*----------------------------------------------------------------------------
Define external input frequency values
*----------------------------------------------------------------------------*/
#define CLK_32KHZ 32768UL /* 32 kHz oscillator frequency */
#define CLK_IRC 12000000UL /* Internal oscillator frequency */
#define CLK_ENET_RX 50000000UL /* Ethernet Rx frequency */
#define CLK_ENET_TX 50000000UL /* Ethernet Tx frequency */
#define CLK_GP_CLKIN 12000000UL /* General purpose clock input freq. */
#define CLK_XTAL 12000000UL /* Crystal oscilator frequency */
/*----------------------------------------------------------------------------
Define clock sources
*----------------------------------------------------------------------------*/
#define PLL1_CLK_SEL CLK_SRC_XTAL /* PLL1 input clock: XTAL */
#define PLL0USB_CLK_SEL CLK_SRC_XTAL /* PLL0USB input clock: XTAL */
#define IDIVA_CLK_SEL CLK_SRC_PLL0U /* IDIVA input clock: PLL0USB */
#define IDIVB_CLK_SEL CLK_SRC_ENET_TX /* IDIVB input clock: ENET TX */
#define IDIVC_CLK_SEL CLK_SRC_IDIVA /* IDIVC input clock: IDIVA */
#define IDIVD_CLK_SEL CLK_SRC_PLL1 /* IDIVD input clock: PLL1 */
#define IDIVE_CLK_SEL CLK_SRC_PLL1 /* IDIVD input clock: PLL1 */
/*----------------------------------------------------------------------------
Configure integer divider values
*----------------------------------------------------------------------------*/
#define IDIVA_IDIV 2 /* Divide input clock by 3 */
#define IDIVB_IDIV 1 /* Divide input clock by 2 */
#define IDIVC_IDIV 3 /* Divide input clock by 4 */
#define IDIVD_IDIV 1 /* Divide input clock by 2 */
#define IDIVE_IDIV 38 /* Divide input clock by 39 */
/*----------------------------------------------------------------------------
Define CPU clock input
*----------------------------------------------------------------------------*/
#define CPU_CLK_SEL CLK_SRC_PLL1 /* Default CPU clock source is PLL1 */
/*----------------------------------------------------------------------------
Configure external memory controller options
*----------------------------------------------------------------------------*/
#define USE_EXT_STAT_MEM_CS0 0 /* Use ext. static memory with CS0 */
#define USE_EXT_DYN_MEM_CS0 1 /* Use ext. dynamic memory with CS0 */
/*----------------------------------------------------------------------------
* Configure PLL1
*----------------------------------------------------------------------------
* Integer mode:
* - PLL1_DIRECT = 0 (Post divider enabled)
* - PLL1_FBSEL = 1 (Feedback divider runs from PLL output)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M
* FCCO = FCLKOUT * 2 * P
*
* Non-integer:
* - PLL1_DIRECT = 0 (Post divider enabled)
* - PLL1_FBSEL = 0 (Feedback divider runs from CCO clock)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M / (2 * P)
* FCCO = FCLKOUT * 2 * P
*
* Direct mode:
* - PLL1_DIRECT = 1 (Post divider disabled)
* - PLL1_FBSEL = dont care (Feedback divider runs from CCO clock)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M
* FCCO = FCLKOUT
*
*----------------------------------------------------------------------------
* PLL1 requirements:
* | Frequency | Minimum | Maximum | Note |
* | FCLKIN | 1MHz | 25MHz | Clock source is external crystal |
* | FCLKIN | 1MHz | 50MHz | |
* | FCCO | 156MHz | 320MHz | |
* | FCLKOUT | 9.75MHz | 320MHz | |
*----------------------------------------------------------------------------
* Configuration examples:
* | Fclkout | Fcco | N | M | P | DIRECT | FBSEL | BYPASS |
* | 36MHz | 288MHz | 1 | 24 | 4 | 0 | 0 | 0 |
* | 72MHz | 288MHz | 1 | 24 | 2 | 0 | 0 | 0 |
* | 100MHz | 200MHz | 3 | 50 | 1 | 0 | 0 | 0 |
* | 120MHz | 240MHz | 1 | 20 | 1 | 0 | 0 | 0 |
* | 160MHz | 160MHz | 3 | 40 | x | 1 | 0 | 0 |
* | 180MHz | 180MHz | 1 | 15 | x | 1 | 0 | 0 |
* | 204MHz | 204MHz | 1 | 17 | x | 1 | 0 | 0 |
*----------------------------------------------------------------------------
* Relations beetwen PLL dividers and definitions:
* N = PLL1_NSEL + 1, M = PLL1_MSEL + 1, P = 2 ^ PLL1_PSEL
*----------------------------------------------------------------------------*/
/* PLL1 output clock: 204MHz, Fcco: 204MHz, N = 1, M = 17, P = x */
#define PLL1_NSEL 0 /* Range [0 - 3]: Pre-divider ratio N */
#define PLL1_MSEL 16 /* Range [0 - 255]: Feedback-divider ratio M */
#define PLL1_PSEL 0 /* Range [0 - 3]: Post-divider ratio P */
#define PLL1_BYPASS 0 /* 0: Use PLL, 1: PLL is bypassed */
#define PLL1_DIRECT 1 /* 0: Use PSEL, 1: Don't use PSEL */
#define PLL1_FBSEL 0 /* 0: FCCO is used as PLL feedback */
/* 1: FCLKOUT is used as PLL feedback */
/*----------------------------------------------------------------------------
* Configure PLL0USB
*----------------------------------------------------------------------------
*
* Normal operating mode without post-divider and without pre-divider
* - PLL0USB_DIRECTI = 1
* - PLL0USB_DIRECTO = 1
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * 2 * M
* FCCO = FOUT
*
* Normal operating mode with post-divider and without pre-divider
* - PLL0USB_DIRECTI = 1
* - PLL0USB_DIRECTO = 0
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * (M / P)
* FCCO = FOUT * 2 * P
*
* Normal operating mode without post-divider and with pre-divider
* - PLL0USB_DIRECTI = 0
* - PLL0USB_DIRECTO = 1
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * 2 * M / N
* FCCO = FOUT
*
* Normal operating mode with post-divider and with pre-divider
* - PLL0USB_DIRECTI = 0
* - PLL0USB_DIRECTO = 0
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * M / (P * N)
* FCCO = FOUT * 2 * P
*----------------------------------------------------------------------------
* PLL0 requirements:
* | Frequency | Minimum | Maximum | Note |
* | FCLKIN | 14kHz | 25MHz | Clock source is external crystal |
* | FCLKIN | 14kHz | 150MHz | |
* | FCCO | 275MHz | 550MHz | |
* | FCLKOUT | 4.3MHz | 550MHz | |
*----------------------------------------------------------------------------
* Configuration examples:
* | Fclkout | Fcco | N | M | P | DIRECTI | DIRECTO | BYPASS |
* | 120MHz | 480MHz | x | 20 | 2 | 1 | 0 | 0 |
* | 480MHz | 480MHz | 1 | 20 | 1 | 1 | 1 | 0 |
*----------------------------------------------------------------------------*/
/* PLL0USB output clock: 480MHz, Fcco: 480MHz, N = 1, M = 20, P = 1 */
#define PLL0USB_N 1 /* Range [1 - 256]: Pre-divider */
#define PLL0USB_M 20 /* Range [1 - 2^15]: Feedback-divider */
#define PLL0USB_P 1 /* Range [1 - 32]: Post-divider */
#define PLL0USB_DIRECTI 1 /* 0: Use N_DIV, 1: Don't use N_DIV */
#define PLL0USB_DIRECTO 1 /* 0: Use P_DIV, 1: Don't use P_DIV */
#define PLL0USB_BYPASS 0 /* 0: Use PLL, 1: PLL is bypassed */
外部内存配置：
/*---------------------------------------- ----------------------------------
外部内存控制器定义
*----------------------------------------------------------------------------*/
#define SDRAM_ADDR_BASE 0x28000000 /* SDRAM base address */
/* Write Mode register macro */
#define WR_MODE(x) (*((volatile uint32_t *)(SDRAM_ADDR_BASE | (x))))
/* Pin Settings: Glith filter DIS, Input buffer EN, Fast Slew Rate, No Pullup */
#define EMC_PIN_SET ((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4))
#define EMC_NANOSEC(ns, freq, div) (((uint64_t)(ns) * ((freq)/((div)+1)))/1000000000)
#define EMC_CLK_DLY_TIM_2 (0x7777) /* 3.5 ns delay for the EMC clock out */
#define EMC_CLK_DLY_TIM_0 (0x0000) /* No delay for the EMC clock out */
typedef void (*emcdivby2) (volatile uint32_t *creg6, volatile uint32_t *emcdiv, uint32_t cfg);
const uint16_t emcdivby2_opc[] = {
0x6803, /* LDR R3,[R0,#0] ; Load CREG6 */
0xF443,0x3380, /* ORR R3,R3,#0x10000 ; Set Divided by 2 */
0x6003, /* STR R3,[R0,#0] ; Store CREG6 */
0x600A, /* STR R2,[R1,#0] ; EMCDIV_CFG = cfg */
0x684B, /* loop LDR R3,[R1,#4] ; Load EMCDIV_STAT */
0x07DB, /* LSLS R3,R3,#31 ; Check EMCDIV_STAT.0 */
0xD0FC, /* BEQ loop ; Jump if 0 */
0x4770, /* BX LR ; Exit */
0,
};
#define emcdivby2_szw ((sizeof(emcdivby2_opc)+3)/4)
#define emcdivby2_ram 0x10000000
/*----------------------------------------------------------------------------
Initialize external memory controller
*----------------------------------------------------------------------------*/
void SystemInit_ExtMemCtl (void) {
uint32_t emcdivby2_buf[emcdivby2_szw];
uint32_t div, n;
/* Select and enable EMC branch clock */
LPC_CCU1->CLK_M4_EMC_CFG = (1 << 2) | (1 << 1) | 1;
while (!(LPC_CCU1->CLK_M4_EMC_STAT & 1));
/* Set EMC clock output delay */
if (SystemCoreClock < 80000000UL) {
LPC_SCU->EMCDELAYCLK = EMC_CLK_DLY_TIM_0; /* No EMC clock out delay */
}
else {
LPC_SCU->EMCDELAYCLK = EMC_CLK_DLY_TIM_2; /* 2.0 ns EMC clock out delay */
}
/* Configure EMC port pins */
LPC_SCU->SFSP1_0 = EMC_PIN_SET | 2; /* P1_0: A5 */
LPC_SCU->SFSP1_1 = EMC_PIN_SET | 2; /* P1_1: A6 */
LPC_SCU->SFSP1_2 = EMC_PIN_SET | 2; /* P1_2: A7 */
// LPC_SCU->SFSP1_3 = EMC_PIN_SET | 3; /* P1_3: OE */
// LPC_SCU->SFSP1_4 = EMC_PIN_SET | 3; /* P1_4: BLS0 */
LPC_SCU->SFSP1_5 = EMC_PIN_SET | 3; /* P1_5: CS0 */
LPC_SCU->SFSP1_6 = EMC_PIN_SET | 3; /* P1_6: WE */
LPC_SCU->SFSP1_7 = EMC_PIN_SET | 3; /* P1_7: D0 */
LPC_SCU->SFSP1_8 = EMC_PIN_SET | 3; /* P1_8: D1 */
LPC_SCU->SFSP1_9 = EMC_PIN_SET | 3; /* P1_9: D2 */
LPC_SCU->SFSP1_10 = EMC_PIN_SET | 3; /* P1_10: D3 */
LPC_SCU->SFSP1_11 = EMC_PIN_SET | 3; /* P1_11: D4 */
LPC_SCU->SFSP1_12 = EMC_PIN_SET | 3; /* P1_12: D5 */
LPC_SCU->SFSP1_13 = EMC_PIN_SET | 3; /* P1_13: D6 */
LPC_SCU->SFSP1_14 = EMC_PIN_SET | 3; /* P1_14: D7 */
LPC_SCU->SFSP2_0 = EMC_PIN_SET | 2; /* P2_0: A13 */
LPC_SCU->SFSP2_1 = EMC_PIN_SET | 2; /* P2_1: A12 */
LPC_SCU->SFSP2_2 = EMC_PIN_SET | 2; /* P2_2: A11 */
LPC_SCU->SFSP2_6 = EMC_PIN_SET | 2; /* P2_6: A10 */
LPC_SCU->SFSP2_7 = EMC_PIN_SET | 3; /* P2_7: A9 */
LPC_SCU->SFSP2_8 = EMC_PIN_SET | 3; /* P2_8: A8 */
LPC_SCU->SFSP2_9 = EMC_PIN_SET | 3; /* P2_9: A0 */
LPC_SCU->SFSP2_10 = EMC_PIN_SET | 3; /* P2_10: A1 */
LPC_SCU->SFSP2_11 = EMC_PIN_SET | 3; /* P2_11: A2 */
LPC_SCU->SFSP2_12 = EMC_PIN_SET | 3; /* P2_12: A3 */
LPC_SCU->SFSP2_13 = EMC_PIN_SET | 3; /* P2_13: A4 */
LPC_SCU->SFSP5_0 = EMC_PIN_SET | 2; /* P5_0: D12 */
LPC_SCU->SFSP5_1 = EMC_PIN_SET | 2; /* P5_1: D13 */
LPC_SCU->SFSP5_2 = EMC_PIN_SET | 2; /* P5_2: D14 */
LPC_SCU->SFSP5_3 = EMC_PIN_SET | 2; /* P5_3: D15 */
LPC_SCU->SFSP5_4 = EMC_PIN_SET | 2; /* P5_4: D8 */
LPC_SCU->SFSP5_5 = EMC_PIN_SET | 2; /* P5_5: D9 */
LPC_SCU->SFSP5_6 = EMC_PIN_SET | 2; /* P5_6: D10 */
LPC_SCU->SFSP5_7 = EMC_PIN_SET | 2; /* P5_7: D11 */
// LPC_SCU->SFSP6_1 = EMC_PIN_SET | 1; /* P6_1: DYCS1 */
// LPC_SCU->SFSP6_2 = EMC_PIN_SET | 1; /* P6_2: CKEOUT1 */
// LPC_SCU->SFSP6_3 = EMC_PIN_SET | 3; /* P6_3: CS1 */
LPC_SCU->SFSP6_4 = EMC_PIN_SET | 3; /* P6_4: CAS */
LPC_SCU->SFSP6_5 = EMC_PIN_SET | 3; /* P6_5: RAS */
// LPC_SCU->SFSP6_6 = EMC_PIN_SET | 1; /* P6_6: BLS1 */
// LPC_SCU->SFSP6_7 = EMC_PIN_SET | 1; /* P6_7: A15 */
LPC_SCU->SFSP6_8 = EMC_PIN_SET | 1; /* P6_8: A14 */
LPC_SCU->SFSP6_9 = EMC_PIN_SET | 3; /* P6_9: DYCS0 */
LPC_SCU->SFSP6_10 = EMC_PIN_SET | 3; /* P6_10: DQMOUT1 */
LPC_SCU->SFSP6_11 = EMC_PIN_SET | 3; /* P6_11: CKEOUT0 */
LPC_SCU->SFSP6_12 = EMC_PIN_SET | 3; /* P6_12: DQMOUT0 */
// LPC_SCU->SFSPA_4 = EMC_PIN_SET | 3; /* PA_4: A23 */
LPC_SCU->SFSPD_0 = EMC_PIN_SET | 2; /* PD_0: DQMOUT2 */
// LPC_SCU->SFSPD_1 = EMC_PIN_SET | 2; /* PD_1: CKEOUT2 */
LPC_SCU->SFSPD_2 = EMC_PIN_SET | 2; /* PD_2: D16 */
LPC_SCU->SFSPD_3 = EMC_PIN_SET | 2; /* PD_3: D17 */
LPC_SCU->SFSPD_4 = EMC_PIN_SET | 2; /* PD_4: D18 */
LPC_SCU->SFSPD_5 = EMC_PIN_SET | 2; /* PD_5: D19 */
LPC_SCU->SFSPD_6 = EMC_PIN_SET | 2; /* PD_6: D20 */
LPC_SCU->SFSPD_7 = EMC_PIN_SET | 2; /* PD_7: D21 */
LPC_SCU->SFSPD_8 = EMC_PIN_SET | 2; /* PD_8: D22 */
LPC_SCU->SFSPD_9 = EMC_PIN_SET | 2; /* PD_9: D23 */
// LPC_SCU->SFSPD_10 = EMC_PIN_SET | 2; /* PD_10: BLS3 */
// LPC_SCU->SFSPD_11 = EMC_PIN_SET | 2; /* PD_11: CS3 */
// LPC_SCU->SFSPD_12 = EMC_PIN_SET | 2; /* PD_12: CS2 */
// LPC_SCU->SFSPD_13 = EMC_PIN_SET | 2; /* PD_13: BLS2 */
// LPC_SCU->SFSPD_14 = EMC_PIN_SET | 2; /* PD_14: DYCS2 */
// LPC_SCU->SFSPD_15 = EMC_PIN_SET | 2; /* PD_15: A17 */
// LPC_SCU->SFSPD_16 = EMC_PIN_SET | 2; /* PD_16: A16 */
// LPC_SCU->SFSPE_0 = EMC_PIN_SET | 3; /* PE_0: A18 */
// LPC_SCU->SFSPE_1 = EMC_PIN_SET | 3; /* PE_1: A19 */
// LPC_SCU->SFSPE_2 = EMC_PIN_SET | 3; /* PE_2: A20 */
// LPC_SCU->SFSPE_3 = EMC_PIN_SET | 3; /* PE_3: A21 */
// LPC_SCU->SFSPE_4 = EMC_PIN_SET | 3; /* PE_4: A22 */
LPC_SCU->SFSPE_5 = EMC_PIN_SET | 3; /* PE_5: D24 */
LPC_SCU->SFSPE_6 = EMC_PIN_SET | 3; /* PE_6: D25 */
LPC_SCU->SFSPE_7 = EMC_PIN_SET | 3; /* PE_7: D26 */
LPC_SCU->SFSPE_8 = EMC_PIN_SET | 3; /* PE_8: D27 */
LPC_SCU->SFSPE_9 = EMC_PIN_SET | 3; /* PE_9: D28 */
LPC_SCU->SFSPE_10 = EMC_PIN_SET | 3; /* PE_10: D29 */
LPC_SCU->SFSPE_11 = EMC_PIN_SET | 3; /* PE_11: D30 */
LPC_SCU->SFSPE_12 = EMC_PIN_SET | 3; /* PE_12: D31 */
LPC_SCU->SFSPE_13 = EMC_PIN_SET | 3; /* PE_13: DQMOUT3 */
// LPC_SCU->SFSPE_14 = EMC_PIN_SET | 3; /* PE_14: DYCS3 */
// LPC_SCU->SFSPE_15 = EMC_PIN_SET | 3; /* PE_15: CKEOUT3 */
LPC_EMC->CONTROL = 0x00000001; /* EMC Enable */
LPC_EMC->CONFIG = 0x00000000; /* Little-endian, Clock Ratio 1:1 */
div = 0;
if (SystemCoreClock > 120000000UL) {
/* Use EMC clock divider and EMC clock output delay */
div = 1;
/* Following code must be executed in RAM to ensure stable operation */
/* LPC_CCU1->CLK_M4_EMCDIV_CFG = (1 << 5) | (1 << 2) | (1 << 1) | 1; */
/* LPC_CREG->CREG6 |= (1 << 16); // EMC_CLK_DIV divided by 2 */
/* while (!(LPC_CCU1->CLK_M4_EMCDIV_STAT & 1)); */
/* This code configures EMC clock divider and is executed in RAM */
for (n = 0; n < emcdivby2_szw; n++) {
emcdivby2_buf[n] = *((uint32_t *)emcdivby2_ram + n);
*((uint32_t *)emcdivby2_ram + n) = *((uint32_t *)emcdivby2_opc + n);
}
__ISB();
((emcdivby2 )(emcdivby2_ram+1))(&LPC_CREG->CREG6, &LPC_CCU1->CLK_M4_EMCDIV_CFG, (1 << 5) | (1 << 2) | (1 << 1) | 1);
for (n = 0; n < emcdivby2_szw; n++) {
*((uint32_t *)emcdivby2_ram + n) = emcdivby2_buf[n];
}
}
/* Configure EMC clock-out pins */
LPC_SCU->SFSCLK_0 = EMC_PIN_SET | 0; /* CLK0 */
LPC_SCU->SFSCLK_1 = EMC_PIN_SET | 0; /* CLK1 */
LPC_SCU->SFSCLK_2 = EMC_PIN_SET | 0; /* CLK2 */
LPC_SCU->SFSCLK_3 = EMC_PIN_SET | 0; /* CLK3 */
/* Static memory configuration (chip select 0) */
#if (USE_EXT_STAT_MEM_CS0)
LPC_EMC->STATICCONFIG0 = (1 << 7) | /* Byte lane state: use WE signal */
(2 << 0) | /* Memory width 32-bit */
(1 << 3); /* Async page mode enable */
LPC_EMC->STATICWAITOEN0 = (0 << 0) ; /* Wait output enable: No delay */
LPC_EMC->STATICWAITPAGE0 = 2;
/* Set Static Memory Read Delay for 90ns External NOR Flash */
LPC_EMC->STATICWAITRD0 = 1 + EMC_NANOSEC(90, SystemCoreClock, div);
LPC_EMC->STATICCONFIG0 |= (1 << 19) ; /* Enable buffer */
#endif
/* Dynamic memory configuration (chip select 0) */
#if (USE_EXT_DYN_MEM_CS0)
/* Set Address mapping: 128Mb(4Mx32), 4 banks, row len = 12, column len = 8 */
LPC_EMC->DYNAMICCONFIG0 = (1 << 14) | /* AM[14] = 1 */
(0 << 12) | /* AM[12] = 0 */
(3 << 9) | /* AM[11:9] = 2 */
(2 << 7) ; /* AM[8:7] = 2 */
LPC_EMC->DYNAMICRASCAS0 = 0x00000303; /* Latency: RAS 3, CAS 3 CCLK cyc.*/
LPC_EMC->DYNAMICREADCONFIG = 0x00000001; /* Command delayed by 1/2 CCLK */
LPC_EMC->DYNAMICRP = EMC_NANOSEC (20, SystemCoreClock, div);
LPC_EMC->DYNAMICRAS = EMC_NANOSEC (42, SystemCoreClock, div);
LPC_EMC->DYNAMICSREX = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICAPR = EMC_NANOSEC (70, SystemCoreClock, div);
LPC_EMC->DYNAMICDAL = EMC_NANOSEC (70, SystemCoreClock, div);
LPC_EMC->DYNAMICWR = EMC_NANOSEC (30, SystemCoreClock, div);
LPC_EMC->DYNAMICRC = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICRFC = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICXSR = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICRRD = EMC_NANOSEC (14, SystemCoreClock, div);
LPC_EMC->DYNAMICMRD = EMC_NANOSEC (30, SystemCoreClock, div);
WaitUs (100);
LPC_EMC->DYNAMICCONTROL = 0x00000183; /* Issue NOP command */
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000103; /* Issue PALL command */
WaitUs (1);
LPC_EMC->DYNAMICCONTROL = 0x00000183; /* Issue NOP command */
WaitUs (1);
LPC_EMC->DYNAMICREFRESH = EMC_NANOSEC( 200, SystemCoreClock, div) / 16 + 1;
WaitUs (10);
LPC_EMC->DYNAMICREFRESH = EMC_NANOSEC(15625, SystemCoreClock, div) / 16 + 1;
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000083; /* Issue MODE command */
/* Mode register: Burst Length: 4, Burst Type: Sequential, CAS Latency: 3 */
WR_MODE(((3 << 4) | 2) << 12);
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000002; /* Issue NORMAL command */
LPC_EMC->DYNAMICCONFIG0 |= (1 << 19); /* Enable buffer */
#endif
}
SDRAM原理图：
SDRAM schematic
欢迎任何关于配置此 sdram 或使用 LPCOpen system_init 的建议。
坦克
我解决了这个问题。
问题出在 system_LPC43xx.c 外部存储器设置中。
有2个问题。第一个是sdram地址映射的配置。
应该是：
/* Set Address mapping: 256Mb(8Mx32), 4 banks, row len = 12, column len = 9 */
LPC_EMC->DYNAMICCONFIG0 = (1 << 14) | /* AM[14] = 1 */
(0 << 12) | /* AM[12] = 0 */
(2 << 9) | /* AM[11:9] = 2 */
(1 << 7) ; /* AM[8:7] = 1 */
第二个是 SDRAM 模式寄存器突发长度设置（LPC4357 用户手册中的第 23.8.5.2 节）。应该是：
/* Mode register: Burst Length: 4, Burst Type: Sequential, CAS Latency: 3 */
/* OFFSET = 13 = 9 + 2 + 2 = number of columns + total bus width + bank select bits (RBC mode) */
WR_MODE(((3 << 4) | 2) << 13);
如果有人对 EMC 设置有任何疑问，我可以提供帮助（由于阅读和试验很多，我现在是一名 EMC 人员:)）
我正在使用 uVision KEIL MDK 5.22 和 LPC4357 (CortextM4F 204MHz)。 我想配置 LPC4357 的 EMC（外部内存控制器）来驱动 IS42S32800J-6TL SDRAM。这是一个 256Mbit 2Meg X 32 X 4 banks sdram with 32bit data bus.
我的问题是我不能使用这个 SDRAM 的全部 32MByte；只有我可以驱动它的 16MBytes。换句话说，我可能使用 16MByte sdram
我的目标是驱动具有最大性能和大小的 sdram（204MHz 的 MCU 和 102MHz 速度的 SDRAM）。
我正在使用具有以下源的 KEIL system_LPC43xx.c 启动文件。 我的配置有什么问题，我不能正确使用这个 SDRAM。有时它也无法正常工作。 （我使用 lpcopen memtest 来测试我的 sdram）。有没有人有这个 ram 或类似的配置。
MCU时钟配置：
/*----------------------------------------------------------------------------
This file configures the clocks as follows:
-----------------------------------------------------------------------------
Clock Unit | Output clock | Source clock | Note
-----------------------------------------------------------------------------
PLL0USB | 480 MHz | XTAL | External crystal @ 12 MHz
-----------------------------------------------------------------------------
PLL1 | 204 MHz | XTAL | External crystal @ 12 MHz
-----------------------------------------------------------------------------
CPU | 204 MHz | PLL1 | CPU Clock == BASE_M4_CLK
-----------------------------------------------------------------------------
IDIV A | 160 MHz | PLL0USB | For 80/40MHz SPIFI
-----------------------------------------------------------------------------
IDIV B | 25 MHz | ENET_TX_CLK | ENET_TX_CLK @ 50MHz
-----------------------------------------------------------------------------
IDIV C | 40 MHz | IDIV A | To SPIFI
-----------------------------------------------------------------------------
IDIV D | 102 MHz | PLL1 | For 102MHz core/SPIFI
-----------------------------------------------------------------------------
IDIV E | 5.3 MHz | PLL1 | To the LCD controller
-----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------
Clock source selection definitions (do not change)
*----------------------------------------------------------------------------*/
#define CLK_SRC_32KHZ 0x00
#define CLK_SRC_IRC 0x01
#define CLK_SRC_ENET_RX 0x02
#define CLK_SRC_ENET_TX 0x03
#define CLK_SRC_GP_CLKIN 0x04
#define CLK_SRC_XTAL 0x06
#define CLK_SRC_PLL0U 0x07
#define CLK_SRC_PLL0A 0x08
#define CLK_SRC_PLL1 0x09
#define CLK_SRC_IDIVA 0x0C
#define CLK_SRC_IDIVB 0x0D
#define CLK_SRC_IDIVC 0x0E
#define CLK_SRC_IDIVD 0x0F
#define CLK_SRC_IDIVE 0x10
/*----------------------------------------------------------------------------
Define external input frequency values
*----------------------------------------------------------------------------*/
#define CLK_32KHZ 32768UL /* 32 kHz oscillator frequency */
#define CLK_IRC 12000000UL /* Internal oscillator frequency */
#define CLK_ENET_RX 50000000UL /* Ethernet Rx frequency */
#define CLK_ENET_TX 50000000UL /* Ethernet Tx frequency */
#define CLK_GP_CLKIN 12000000UL /* General purpose clock input freq. */
#define CLK_XTAL 12000000UL /* Crystal oscilator frequency */
/*----------------------------------------------------------------------------
Define clock sources
*----------------------------------------------------------------------------*/
#define PLL1_CLK_SEL CLK_SRC_XTAL /* PLL1 input clock: XTAL */
#define PLL0USB_CLK_SEL CLK_SRC_XTAL /* PLL0USB input clock: XTAL */
#define IDIVA_CLK_SEL CLK_SRC_PLL0U /* IDIVA input clock: PLL0USB */
#define IDIVB_CLK_SEL CLK_SRC_ENET_TX /* IDIVB input clock: ENET TX */
#define IDIVC_CLK_SEL CLK_SRC_IDIVA /* IDIVC input clock: IDIVA */
#define IDIVD_CLK_SEL CLK_SRC_PLL1 /* IDIVD input clock: PLL1 */
#define IDIVE_CLK_SEL CLK_SRC_PLL1 /* IDIVD input clock: PLL1 */
/*----------------------------------------------------------------------------
Configure integer divider values
*----------------------------------------------------------------------------*/
#define IDIVA_IDIV 2 /* Divide input clock by 3 */
#define IDIVB_IDIV 1 /* Divide input clock by 2 */
#define IDIVC_IDIV 3 /* Divide input clock by 4 */
#define IDIVD_IDIV 1 /* Divide input clock by 2 */
#define IDIVE_IDIV 38 /* Divide input clock by 39 */
/*----------------------------------------------------------------------------
Define CPU clock input
*----------------------------------------------------------------------------*/
#define CPU_CLK_SEL CLK_SRC_PLL1 /* Default CPU clock source is PLL1 */
/*----------------------------------------------------------------------------
Configure external memory controller options
*----------------------------------------------------------------------------*/
#define USE_EXT_STAT_MEM_CS0 0 /* Use ext. static memory with CS0 */
#define USE_EXT_DYN_MEM_CS0 1 /* Use ext. dynamic memory with CS0 */
/*----------------------------------------------------------------------------
* Configure PLL1
*----------------------------------------------------------------------------
* Integer mode:
* - PLL1_DIRECT = 0 (Post divider enabled)
* - PLL1_FBSEL = 1 (Feedback divider runs from PLL output)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M
* FCCO = FCLKOUT * 2 * P
*
* Non-integer:
* - PLL1_DIRECT = 0 (Post divider enabled)
* - PLL1_FBSEL = 0 (Feedback divider runs from CCO clock)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M / (2 * P)
* FCCO = FCLKOUT * 2 * P
*
* Direct mode:
* - PLL1_DIRECT = 1 (Post divider disabled)
* - PLL1_FBSEL = dont care (Feedback divider runs from CCO clock)
* - Output frequency:
* FCLKOUT = (FCLKIN / N) * M
* FCCO = FCLKOUT
*
*----------------------------------------------------------------------------
* PLL1 requirements:
* | Frequency | Minimum | Maximum | Note |
* | FCLKIN | 1MHz | 25MHz | Clock source is external crystal |
* | FCLKIN | 1MHz | 50MHz | |
* | FCCO | 156MHz | 320MHz | |
* | FCLKOUT | 9.75MHz | 320MHz | |
*----------------------------------------------------------------------------
* Configuration examples:
* | Fclkout | Fcco | N | M | P | DIRECT | FBSEL | BYPASS |
* | 36MHz | 288MHz | 1 | 24 | 4 | 0 | 0 | 0 |
* | 72MHz | 288MHz | 1 | 24 | 2 | 0 | 0 | 0 |
* | 100MHz | 200MHz | 3 | 50 | 1 | 0 | 0 | 0 |
* | 120MHz | 240MHz | 1 | 20 | 1 | 0 | 0 | 0 |
* | 160MHz | 160MHz | 3 | 40 | x | 1 | 0 | 0 |
* | 180MHz | 180MHz | 1 | 15 | x | 1 | 0 | 0 |
* | 204MHz | 204MHz | 1 | 17 | x | 1 | 0 | 0 |
*----------------------------------------------------------------------------
* Relations beetwen PLL dividers and definitions:
* N = PLL1_NSEL + 1, M = PLL1_MSEL + 1, P = 2 ^ PLL1_PSEL
*----------------------------------------------------------------------------*/
/* PLL1 output clock: 204MHz, Fcco: 204MHz, N = 1, M = 17, P = x */
#define PLL1_NSEL 0 /* Range [0 - 3]: Pre-divider ratio N */
#define PLL1_MSEL 16 /* Range [0 - 255]: Feedback-divider ratio M */
#define PLL1_PSEL 0 /* Range [0 - 3]: Post-divider ratio P */
#define PLL1_BYPASS 0 /* 0: Use PLL, 1: PLL is bypassed */
#define PLL1_DIRECT 1 /* 0: Use PSEL, 1: Don't use PSEL */
#define PLL1_FBSEL 0 /* 0: FCCO is used as PLL feedback */
/* 1: FCLKOUT is used as PLL feedback */
/*----------------------------------------------------------------------------
* Configure PLL0USB
*----------------------------------------------------------------------------
*
* Normal operating mode without post-divider and without pre-divider
* - PLL0USB_DIRECTI = 1
* - PLL0USB_DIRECTO = 1
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * 2 * M
* FCCO = FOUT
*
* Normal operating mode with post-divider and without pre-divider
* - PLL0USB_DIRECTI = 1
* - PLL0USB_DIRECTO = 0
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * (M / P)
* FCCO = FOUT * 2 * P
*
* Normal operating mode without post-divider and with pre-divider
* - PLL0USB_DIRECTI = 0
* - PLL0USB_DIRECTO = 1
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * 2 * M / N
* FCCO = FOUT
*
* Normal operating mode with post-divider and with pre-divider
* - PLL0USB_DIRECTI = 0
* - PLL0USB_DIRECTO = 0
* - PLL0USB_BYPASS = 0
* - Output frequency:
* FOUT = FIN * M / (P * N)
* FCCO = FOUT * 2 * P
*----------------------------------------------------------------------------
* PLL0 requirements:
* | Frequency | Minimum | Maximum | Note |
* | FCLKIN | 14kHz | 25MHz | Clock source is external crystal |
* | FCLKIN | 14kHz | 150MHz | |
* | FCCO | 275MHz | 550MHz | |
* | FCLKOUT | 4.3MHz | 550MHz | |
*----------------------------------------------------------------------------
* Configuration examples:
* | Fclkout | Fcco | N | M | P | DIRECTI | DIRECTO | BYPASS |
* | 120MHz | 480MHz | x | 20 | 2 | 1 | 0 | 0 |
* | 480MHz | 480MHz | 1 | 20 | 1 | 1 | 1 | 0 |
*----------------------------------------------------------------------------*/
/* PLL0USB output clock: 480MHz, Fcco: 480MHz, N = 1, M = 20, P = 1 */
#define PLL0USB_N 1 /* Range [1 - 256]: Pre-divider */
#define PLL0USB_M 20 /* Range [1 - 2^15]: Feedback-divider */
#define PLL0USB_P 1 /* Range [1 - 32]: Post-divider */
#define PLL0USB_DIRECTI 1 /* 0: Use N_DIV, 1: Don't use N_DIV */
#define PLL0USB_DIRECTO 1 /* 0: Use P_DIV, 1: Don't use P_DIV */
#define PLL0USB_BYPASS 0 /* 0: Use PLL, 1: PLL is bypassed */
外部内存配置：
/*---------------------------------------- ---------------------------------- 外部内存控制器定义
*----------------------------------------------------------------------------*/
#define SDRAM_ADDR_BASE 0x28000000 /* SDRAM base address */
/* Write Mode register macro */
#define WR_MODE(x) (*((volatile uint32_t *)(SDRAM_ADDR_BASE | (x))))
/* Pin Settings: Glith filter DIS, Input buffer EN, Fast Slew Rate, No Pullup */
#define EMC_PIN_SET ((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4))
#define EMC_NANOSEC(ns, freq, div) (((uint64_t)(ns) * ((freq)/((div)+1)))/1000000000)
#define EMC_CLK_DLY_TIM_2 (0x7777) /* 3.5 ns delay for the EMC clock out */
#define EMC_CLK_DLY_TIM_0 (0x0000) /* No delay for the EMC clock out */
typedef void (*emcdivby2) (volatile uint32_t *creg6, volatile uint32_t *emcdiv, uint32_t cfg);
const uint16_t emcdivby2_opc[] = {
0x6803, /* LDR R3,[R0,#0] ; Load CREG6 */
0xF443,0x3380, /* ORR R3,R3,#0x10000 ; Set Divided by 2 */
0x6003, /* STR R3,[R0,#0] ; Store CREG6 */
0x600A, /* STR R2,[R1,#0] ; EMCDIV_CFG = cfg */
0x684B, /* loop LDR R3,[R1,#4] ; Load EMCDIV_STAT */
0x07DB, /* LSLS R3,R3,#31 ; Check EMCDIV_STAT.0 */
0xD0FC, /* BEQ loop ; Jump if 0 */
0x4770, /* BX LR ; Exit */
0,
};
#define emcdivby2_szw ((sizeof(emcdivby2_opc)+3)/4)
#define emcdivby2_ram 0x10000000
/*----------------------------------------------------------------------------
Initialize external memory controller
*----------------------------------------------------------------------------*/
void SystemInit_ExtMemCtl (void) {
uint32_t emcdivby2_buf[emcdivby2_szw];
uint32_t div, n;
/* Select and enable EMC branch clock */
LPC_CCU1->CLK_M4_EMC_CFG = (1 << 2) | (1 << 1) | 1;
while (!(LPC_CCU1->CLK_M4_EMC_STAT & 1));
/* Set EMC clock output delay */
if (SystemCoreClock < 80000000UL) {
LPC_SCU->EMCDELAYCLK = EMC_CLK_DLY_TIM_0; /* No EMC clock out delay */
}
else {
LPC_SCU->EMCDELAYCLK = EMC_CLK_DLY_TIM_2; /* 2.0 ns EMC clock out delay */
}
/* Configure EMC port pins */
LPC_SCU->SFSP1_0 = EMC_PIN_SET | 2; /* P1_0: A5 */
LPC_SCU->SFSP1_1 = EMC_PIN_SET | 2; /* P1_1: A6 */
LPC_SCU->SFSP1_2 = EMC_PIN_SET | 2; /* P1_2: A7 */
// LPC_SCU->SFSP1_3 = EMC_PIN_SET | 3; /* P1_3: OE */
// LPC_SCU->SFSP1_4 = EMC_PIN_SET | 3; /* P1_4: BLS0 */
LPC_SCU->SFSP1_5 = EMC_PIN_SET | 3; /* P1_5: CS0 */
LPC_SCU->SFSP1_6 = EMC_PIN_SET | 3; /* P1_6: WE */
LPC_SCU->SFSP1_7 = EMC_PIN_SET | 3; /* P1_7: D0 */
LPC_SCU->SFSP1_8 = EMC_PIN_SET | 3; /* P1_8: D1 */
LPC_SCU->SFSP1_9 = EMC_PIN_SET | 3; /* P1_9: D2 */
LPC_SCU->SFSP1_10 = EMC_PIN_SET | 3; /* P1_10: D3 */
LPC_SCU->SFSP1_11 = EMC_PIN_SET | 3; /* P1_11: D4 */
LPC_SCU->SFSP1_12 = EMC_PIN_SET | 3; /* P1_12: D5 */
LPC_SCU->SFSP1_13 = EMC_PIN_SET | 3; /* P1_13: D6 */
LPC_SCU->SFSP1_14 = EMC_PIN_SET | 3; /* P1_14: D7 */
LPC_SCU->SFSP2_0 = EMC_PIN_SET | 2; /* P2_0: A13 */
LPC_SCU->SFSP2_1 = EMC_PIN_SET | 2; /* P2_1: A12 */
LPC_SCU->SFSP2_2 = EMC_PIN_SET | 2; /* P2_2: A11 */
LPC_SCU->SFSP2_6 = EMC_PIN_SET | 2; /* P2_6: A10 */
LPC_SCU->SFSP2_7 = EMC_PIN_SET | 3; /* P2_7: A9 */
LPC_SCU->SFSP2_8 = EMC_PIN_SET | 3; /* P2_8: A8 */
LPC_SCU->SFSP2_9 = EMC_PIN_SET | 3; /* P2_9: A0 */
LPC_SCU->SFSP2_10 = EMC_PIN_SET | 3; /* P2_10: A1 */
LPC_SCU->SFSP2_11 = EMC_PIN_SET | 3; /* P2_11: A2 */
LPC_SCU->SFSP2_12 = EMC_PIN_SET | 3; /* P2_12: A3 */
LPC_SCU->SFSP2_13 = EMC_PIN_SET | 3; /* P2_13: A4 */
LPC_SCU->SFSP5_0 = EMC_PIN_SET | 2; /* P5_0: D12 */
LPC_SCU->SFSP5_1 = EMC_PIN_SET | 2; /* P5_1: D13 */
LPC_SCU->SFSP5_2 = EMC_PIN_SET | 2; /* P5_2: D14 */
LPC_SCU->SFSP5_3 = EMC_PIN_SET | 2; /* P5_3: D15 */
LPC_SCU->SFSP5_4 = EMC_PIN_SET | 2; /* P5_4: D8 */
LPC_SCU->SFSP5_5 = EMC_PIN_SET | 2; /* P5_5: D9 */
LPC_SCU->SFSP5_6 = EMC_PIN_SET | 2; /* P5_6: D10 */
LPC_SCU->SFSP5_7 = EMC_PIN_SET | 2; /* P5_7: D11 */
// LPC_SCU->SFSP6_1 = EMC_PIN_SET | 1; /* P6_1: DYCS1 */
// LPC_SCU->SFSP6_2 = EMC_PIN_SET | 1; /* P6_2: CKEOUT1 */
// LPC_SCU->SFSP6_3 = EMC_PIN_SET | 3; /* P6_3: CS1 */
LPC_SCU->SFSP6_4 = EMC_PIN_SET | 3; /* P6_4: CAS */
LPC_SCU->SFSP6_5 = EMC_PIN_SET | 3; /* P6_5: RAS */
// LPC_SCU->SFSP6_6 = EMC_PIN_SET | 1; /* P6_6: BLS1 */
// LPC_SCU->SFSP6_7 = EMC_PIN_SET | 1; /* P6_7: A15 */
LPC_SCU->SFSP6_8 = EMC_PIN_SET | 1; /* P6_8: A14 */
LPC_SCU->SFSP6_9 = EMC_PIN_SET | 3; /* P6_9: DYCS0 */
LPC_SCU->SFSP6_10 = EMC_PIN_SET | 3; /* P6_10: DQMOUT1 */
LPC_SCU->SFSP6_11 = EMC_PIN_SET | 3; /* P6_11: CKEOUT0 */
LPC_SCU->SFSP6_12 = EMC_PIN_SET | 3; /* P6_12: DQMOUT0 */
// LPC_SCU->SFSPA_4 = EMC_PIN_SET | 3; /* PA_4: A23 */
LPC_SCU->SFSPD_0 = EMC_PIN_SET | 2; /* PD_0: DQMOUT2 */
// LPC_SCU->SFSPD_1 = EMC_PIN_SET | 2; /* PD_1: CKEOUT2 */
LPC_SCU->SFSPD_2 = EMC_PIN_SET | 2; /* PD_2: D16 */
LPC_SCU->SFSPD_3 = EMC_PIN_SET | 2; /* PD_3: D17 */
LPC_SCU->SFSPD_4 = EMC_PIN_SET | 2; /* PD_4: D18 */
LPC_SCU->SFSPD_5 = EMC_PIN_SET | 2; /* PD_5: D19 */
LPC_SCU->SFSPD_6 = EMC_PIN_SET | 2; /* PD_6: D20 */
LPC_SCU->SFSPD_7 = EMC_PIN_SET | 2; /* PD_7: D21 */
LPC_SCU->SFSPD_8 = EMC_PIN_SET | 2; /* PD_8: D22 */
LPC_SCU->SFSPD_9 = EMC_PIN_SET | 2; /* PD_9: D23 */
// LPC_SCU->SFSPD_10 = EMC_PIN_SET | 2; /* PD_10: BLS3 */
// LPC_SCU->SFSPD_11 = EMC_PIN_SET | 2; /* PD_11: CS3 */
// LPC_SCU->SFSPD_12 = EMC_PIN_SET | 2; /* PD_12: CS2 */
// LPC_SCU->SFSPD_13 = EMC_PIN_SET | 2; /* PD_13: BLS2 */
// LPC_SCU->SFSPD_14 = EMC_PIN_SET | 2; /* PD_14: DYCS2 */
// LPC_SCU->SFSPD_15 = EMC_PIN_SET | 2; /* PD_15: A17 */
// LPC_SCU->SFSPD_16 = EMC_PIN_SET | 2; /* PD_16: A16 */
// LPC_SCU->SFSPE_0 = EMC_PIN_SET | 3; /* PE_0: A18 */
// LPC_SCU->SFSPE_1 = EMC_PIN_SET | 3; /* PE_1: A19 */
// LPC_SCU->SFSPE_2 = EMC_PIN_SET | 3; /* PE_2: A20 */
// LPC_SCU->SFSPE_3 = EMC_PIN_SET | 3; /* PE_3: A21 */
// LPC_SCU->SFSPE_4 = EMC_PIN_SET | 3; /* PE_4: A22 */
LPC_SCU->SFSPE_5 = EMC_PIN_SET | 3; /* PE_5: D24 */
LPC_SCU->SFSPE_6 = EMC_PIN_SET | 3; /* PE_6: D25 */
LPC_SCU->SFSPE_7 = EMC_PIN_SET | 3; /* PE_7: D26 */
LPC_SCU->SFSPE_8 = EMC_PIN_SET | 3; /* PE_8: D27 */
LPC_SCU->SFSPE_9 = EMC_PIN_SET | 3; /* PE_9: D28 */
LPC_SCU->SFSPE_10 = EMC_PIN_SET | 3; /* PE_10: D29 */
LPC_SCU->SFSPE_11 = EMC_PIN_SET | 3; /* PE_11: D30 */
LPC_SCU->SFSPE_12 = EMC_PIN_SET | 3; /* PE_12: D31 */
LPC_SCU->SFSPE_13 = EMC_PIN_SET | 3; /* PE_13: DQMOUT3 */
// LPC_SCU->SFSPE_14 = EMC_PIN_SET | 3; /* PE_14: DYCS3 */
// LPC_SCU->SFSPE_15 = EMC_PIN_SET | 3; /* PE_15: CKEOUT3 */
LPC_EMC->CONTROL = 0x00000001; /* EMC Enable */
LPC_EMC->CONFIG = 0x00000000; /* Little-endian, Clock Ratio 1:1 */
div = 0;
if (SystemCoreClock > 120000000UL) {
/* Use EMC clock divider and EMC clock output delay */
div = 1;
/* Following code must be executed in RAM to ensure stable operation */
/* LPC_CCU1->CLK_M4_EMCDIV_CFG = (1 << 5) | (1 << 2) | (1 << 1) | 1; */
/* LPC_CREG->CREG6 |= (1 << 16); // EMC_CLK_DIV divided by 2 */
/* while (!(LPC_CCU1->CLK_M4_EMCDIV_STAT & 1)); */
/* This code configures EMC clock divider and is executed in RAM */
for (n = 0; n < emcdivby2_szw; n++) {
emcdivby2_buf[n] = *((uint32_t *)emcdivby2_ram + n);
*((uint32_t *)emcdivby2_ram + n) = *((uint32_t *)emcdivby2_opc + n);
}
__ISB();
((emcdivby2 )(emcdivby2_ram+1))(&LPC_CREG->CREG6, &LPC_CCU1->CLK_M4_EMCDIV_CFG, (1 << 5) | (1 << 2) | (1 << 1) | 1);
for (n = 0; n < emcdivby2_szw; n++) {
*((uint32_t *)emcdivby2_ram + n) = emcdivby2_buf[n];
}
}
/* Configure EMC clock-out pins */
LPC_SCU->SFSCLK_0 = EMC_PIN_SET | 0; /* CLK0 */
LPC_SCU->SFSCLK_1 = EMC_PIN_SET | 0; /* CLK1 */
LPC_SCU->SFSCLK_2 = EMC_PIN_SET | 0; /* CLK2 */
LPC_SCU->SFSCLK_3 = EMC_PIN_SET | 0; /* CLK3 */
/* Static memory configuration (chip select 0) */
#if (USE_EXT_STAT_MEM_CS0)
LPC_EMC->STATICCONFIG0 = (1 << 7) | /* Byte lane state: use WE signal */
(2 << 0) | /* Memory width 32-bit */
(1 << 3); /* Async page mode enable */
LPC_EMC->STATICWAITOEN0 = (0 << 0) ; /* Wait output enable: No delay */
LPC_EMC->STATICWAITPAGE0 = 2;
/* Set Static Memory Read Delay for 90ns External NOR Flash */
LPC_EMC->STATICWAITRD0 = 1 + EMC_NANOSEC(90, SystemCoreClock, div);
LPC_EMC->STATICCONFIG0 |= (1 << 19) ; /* Enable buffer */
#endif
/* Dynamic memory configuration (chip select 0) */
#if (USE_EXT_DYN_MEM_CS0)
/* Set Address mapping: 128Mb(4Mx32), 4 banks, row len = 12, column len = 8 */
LPC_EMC->DYNAMICCONFIG0 = (1 << 14) | /* AM[14] = 1 */
(0 << 12) | /* AM[12] = 0 */
(3 << 9) | /* AM[11:9] = 2 */
(2 << 7) ; /* AM[8:7] = 2 */
LPC_EMC->DYNAMICRASCAS0 = 0x00000303; /* Latency: RAS 3, CAS 3 CCLK cyc.*/
LPC_EMC->DYNAMICREADCONFIG = 0x00000001; /* Command delayed by 1/2 CCLK */
LPC_EMC->DYNAMICRP = EMC_NANOSEC (20, SystemCoreClock, div);
LPC_EMC->DYNAMICRAS = EMC_NANOSEC (42, SystemCoreClock, div);
LPC_EMC->DYNAMICSREX = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICAPR = EMC_NANOSEC (70, SystemCoreClock, div);
LPC_EMC->DYNAMICDAL = EMC_NANOSEC (70, SystemCoreClock, div);
LPC_EMC->DYNAMICWR = EMC_NANOSEC (30, SystemCoreClock, div);
LPC_EMC->DYNAMICRC = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICRFC = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICXSR = EMC_NANOSEC (63, SystemCoreClock, div);
LPC_EMC->DYNAMICRRD = EMC_NANOSEC (14, SystemCoreClock, div);
LPC_EMC->DYNAMICMRD = EMC_NANOSEC (30, SystemCoreClock, div);
WaitUs (100);
LPC_EMC->DYNAMICCONTROL = 0x00000183; /* Issue NOP command */
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000103; /* Issue PALL command */
WaitUs (1);
LPC_EMC->DYNAMICCONTROL = 0x00000183; /* Issue NOP command */
WaitUs (1);
LPC_EMC->DYNAMICREFRESH = EMC_NANOSEC( 200, SystemCoreClock, div) / 16 + 1;
WaitUs (10);
LPC_EMC->DYNAMICREFRESH = EMC_NANOSEC(15625, SystemCoreClock, div) / 16 + 1;
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000083; /* Issue MODE command */
/* Mode register: Burst Length: 4, Burst Type: Sequential, CAS Latency: 3 */
WR_MODE(((3 << 4) | 2) << 12);
WaitUs (10);
LPC_EMC->DYNAMICCONTROL = 0x00000002; /* Issue NORMAL command */
LPC_EMC->DYNAMICCONFIG0 |= (1 << 19); /* Enable buffer */
#endif
}
SDRAM原理图： SDRAM schematic
欢迎任何关于配置此 sdram 或使用 LPCOpen system_init 的建议。 坦克
我解决了这个问题。 问题出在 system_LPC43xx.c 外部存储器设置中。
有2个问题。第一个是sdram地址映射的配置。 应该是：
/* Set Address mapping: 256Mb(8Mx32), 4 banks, row len = 12, column len = 9 */
LPC_EMC->DYNAMICCONFIG0 = (1 << 14) | /* AM[14] = 1 */
(0 << 12) | /* AM[12] = 0 */
(2 << 9) | /* AM[11:9] = 2 */
(1 << 7) ; /* AM[8:7] = 1 */
第二个是 SDRAM 模式寄存器突发长度设置（LPC4357 用户手册中的第 23.8.5.2 节）。应该是：
/* Mode register: Burst Length: 4, Burst Type: Sequential, CAS Latency: 3 */
/* OFFSET = 13 = 9 + 2 + 2 = number of columns + total bus width + bank select bits (RBC mode) */
WR_MODE(((3 << 4) | 2) << 13);
如果有人对 EMC 设置有任何疑问，我可以提供帮助（由于阅读和试验很多，我现在是一名 EMC 人员:)）