DSP

DSP 之外部存储器接口(EMIF)

2019-07-13 12:49发布

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DSP 之外部存储器接口(EMIF):   /******************************************************************************/ /* Copyright 2004 by SEED Electronic Technology LTD. */ /* All rights reserved. SEED Electronic Technology LTD. */ /* Restricted rights to use, duplicate or disclose this code are */ /* granted through contract. */ /* */ /* */ /******************************************************************************/ #include #include #include #include #include Uint16 x; Uint32 y; CSLBool b; unsigned int datacount = 0; int databuffer[1000] ={0}; int *souraddr,*deminaddr; Uint16 button; unsigned char k1_down, k2_down, k3_down, k4_down; /*锁相环的设置*/ PLL_Config myConfig = { 0, //IAI: the PLL locks using the same process that was underway //before the idle mode was entered 1, //IOB: If the PLL indicates a break in the phase lock, //it switches to its bypass mode and restarts the PLL phase-locking //sequence 24, //PLL multiply value; multiply 24 times 1 //Divide by 2 PLL divide value; it can be either PLL divide value //(when PLL is enabled), or Bypass-mode divide value //(PLL in bypass mode, if PLL multiply value is set to 1) }; /*SDRAM的EMIF设置*/ EMIF_Config emiffig = { 0x221, //EGCR : the MEMFREQ = 00,the clock for the memory is equal to cpu frequence // the WPE = 0 ,forbiden the writing posting when we debug the EMIF // the MEMCEN = 1,the memory clock is reflected on the CLKMEM pin // the NOHOLD = 1,HOLD requests are not recognized by the EMIF 0xFFFF, //EMI_RST: any write to this register resets the EMIF state machine 0x3FFF, //CE0_1: CE0 space control register 1 // MTYPE = 011,Synchronous DRAM(SDRAM),16-bit data bus width 0xFFFF, //CE0_2: CE0 space control register 2 0x00FF, //CE0_3: CE0 space control register 3 // TIMEOUT = 0xFF; 0x1FFF, //CE1_1: CE0 space control register 1 // Asynchronous, 16Bit 0xFFFF, //CE1_2: CE0 space control register 2 0x00FF, //CE1_3: CE0 space control register 3 0x1FFF, //CE2_1: CE0 space control register 1 // Asynchronous, 16Bit 0xFFFF, //CE2_2: CE0 space control register 2 0x00FF, //CE2_3: CE0 space control register 3 0x7FFF, //CE3_1: CE0 space control register 1 0xFFFF, //CE3_2: CE0 space control register 2 0x00FF, //CE3_3: CE0 space control register 3 0x2911, //SDC1: SDRAM control register 1 // TRC = 8 // SDSIZE = 0;SDWID = 0 // RFEN = 1 // TRCD = 2 // TRP = 2 0x0410, //SDPER : SDRAM period register // 7ns *4096 0x07FF, //SDINIT: SDRAM initialization register // any write to this register to init the all CE spaces, // do it after hardware reset or power up the C55x device 0x0131 //SDC2: SDRAM control register 2 // SDACC = 0; // TMRD = 01; // TRAS = 0101; // TACTV2ACTV = 0001; }; main() { /*初始化CSL库*/ CSL_init(); /*EMIF为全EMIF接口*/ CHIP_RSET(XBSR, 0x0a01); /*设置系统的运行速度为144MHz*/ PLL_config(&myConfig); /*初始化DSP的EMIF*/ EMIF_config(&emiffig); /* CE2 地址写为 1111 1110 */ souraddr = (int *)0x400001; *souraddr = 0x00fe; while(1) { button = *souraddr; // button = 1111 1110 //scan K1-D0 if(!(button&0x0001)) // 0000 0000 取反为 1111 1111 { if(k1_down==0) { printf("K1 press "); k1_down = 1; } } else { k1_down = 0; } //scan K2-D2 if(!(button&0x0002)) // 1111 0100 取反为 0000 1011 { if(k2_down==0) { printf("K2 press "); k2_down = 1; } } else { k2_down = 0; } //scan K3-D3 if(!(button&0x0004)) // 0000 0100 取反为 1111 1011 { if(k3_down==0) { printf("K3 press "); k3_down = 1; } } else { k3_down = 0; } //scan K4-D4 if(!(button&0x0008)) // 0000 1000 取反为 1111 0111 { if(k4_down==0) { printf("K4 press "); k4_down = 1; } } else { k4_down = 0; } } }
   

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