DSP

DSP 之中断控制(Interrupt)

2019-07-13 09:50发布

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DSP 之中断控制(Interrupt): /* * Copyright (C) 2004 Texas Instruments Incorporated * All Rights Reserved */ #include #include /* mmc0 从cslmem中分配内存 */ #pragma DATA_SECTION(mmc0, "cslmem") MMC_Handle mmc0; MMC_CardObj *card, cardalloc; MMC_CardIdObj *cid, cardid; int retVal,count; Uint16 rca; Uint16 cardtype; /* Because of different operating clock frequencies, the Init structure for c5509 * * and c5509a have different values for memory and function clock divide down values */ #if CHIP_5509A /* Native mode Initialization Structure * 本机模式初始化 */ MMC_SetupNative Init = { 0, /* disable DMA for data read/write */ 0, /* Set level of edge detection for DAT3 pin */ 0, /* Determines if MMC goes IDLE during IDLE instr */ 1, /* Memory clk reflected on CLK Pin */ 7, /* CPU CLK to MMC function clk divide down */ 5, /* MMC function clk to memory clk divide down */ 0, /* No. memory clks to wait before response timeout */ 0, /* No. memory clks to wait before data timeout */ 512, /* Block Length must be same as CSD */ }; #else MMC_SetupNative Init = { 0, /* disable DMA for data read/write */ 0, /* Set level of edge detection for DAT3 pin */ 0, /* Determines if MMC goes IDLE during IDLE instr */ 1, /* Memory clk reflected on CLK Pin */ 3, /* CPU CLK to MMC function clk divide down */ 3, /* MMC function clk to memory clk divide down */ 0, /* No. memory clks to wait before response timeout */ 0, /* No. memory clks to wait before data timeout */ 512, /* Block Length must be same as CSD */ }; #endif /* read with write function allocate in .text */ #pragma CODE_SECTION(read_interrupt,".text") #pragma CODE_SECTION(write_interrupt,".text") /* These are the interrupts to be called for each write and read */ void read_interrupt(); void write_interrupt(); /* ******************************************************************************* * How MMC interrupts work. * * MMC Registers for interrupts * - MMCIE : MMC Interrupt Enable Register * - MMCST0: MMC Status 0 Register * * Structures * - MMC_CallBackObj : Has the call back table for interrupts for different * MMC operations * * Functions * - MMC_dispatch0 : * - MMC_dispatch1 : Functions plugged in to service the MMC interrupt * generated by the CPU * - MMC_setCallBack : Sets the functions to be called as ISRs for MMC * events (e.g. read, write interrupts) into the * MMC_CallBackObj structure * - MMC_intEnable : Write to the MMCIE to enable the interrupt for a * particular MMC event * * Working * The MMC device (in this case device 1) has an associated MMC_dispatch function * (defined in mmc_disp1.c) which is the ISR. This is plugged in to service * interrupts for the MMC. When an interrupt is triggered, the MMC_dispatch checks * the MMCIE and MMCST0 and decodes which event (read, write, etc.) the MMC interrupt * is triggered for and calls the service function for the event from the entries in * the call back structure. * ********************************************************************************** */ #pragma DATA_SECTION(cback, ".csldata"); /* Call back structure: This holds the functions to be called when an interrupt for a * particular MMC event is triggered */ MMC_CallBackObj cback = { (MMC_CallBackPtr)0x0000, /* Callback for Data Transfer Done */ (MMC_CallBackPtr)0x0000, /* Callback for Busy Done */ (MMC_CallBackPtr)0x0000, /* Callback for response Done */ (MMC_CallBackPtr)0x0000, /* Callback for Read-data time-out */ (MMC_CallBackPtr)0x0000, /* Callback for Response time-out */ (MMC_CallBackPtr)0x0000, /* Callback for write-data CRC error */ (MMC_CallBackPtr)0x0000, /* Callback for read-data CRC error */ (MMC_CallBackPtr)0x0000, /* Callback for response CRC error */ (MMC_CallBackPtr)0x0000, /* This is never used */ write_interrupt, /* Callback for data xmt ready */ read_interrupt, /* Callback for data rcv ready */ (MMC_CallBackPtr)0x0000 /* Callback for DAT3 edge */ } ; volatile int reads_done = 0; volatile int writes_done = 0; Uint16 datasend[512]; Uint16 datareceive[512]; /* Function to be called on data receive ready */ void read_interrupt(void) { ++reads_done; return; } /* Function to be called on data transmit ready */ void write_interrupt(void) { ++writes_done; return; } void main() { Uint16 old_intm; /* CSL libary initialize */ CSL_init(); /* Clear all interrupt register */ IRQ_globalDisable(); /* Set interrupt vector table */ IRQ_setVecs(0x10000); printf (" Starting interrupt test... "); /* Fill in source and destination buffers */ for (count=0; count<=256; count++) { datasend[count] = count; datareceive[count] = 0xFFFF; } /* Refer to mmc_setup example for explanation * Reserves the MMC device as specified by device */ mmc0 = MMC_open(MMC_DEV1); /* Native mode Initialization Structure */ MMC_setupNative(mmc0,&Init); /* Sends a broadcast GO_IDLE command */ MMC_sendGoIdle(mmc0); for (retVal=0; retVal<4016; retVal++) asm(" NOP"); /* Sets the operating voltage window while in Native mode * 设置操作电压窗口，为本机模式 */ cardtype = MMC_sendOpCond(mmc0,0x00100000); if (cardtype == 0xFFFF){ printf ("Card not recognized "); exit(0); } if (cardtype == MMC_CARD){ cid = &cardid; /* Sends a broadcast command to all cards to identify themselves */ MMC_sendAllCID(mmc0,cid); // get the CID structure for all cards. card = &cardalloc; /* Sets the relative card address of an attatched memory card */ retVal = MMC_setRca(mmc0,card,10); } else { cid = &cardid; /* Sends a broadcast command to all cards to identify themselves */ SD_sendAllCID(mmc0,cid); // get the CID structure for all cards. card = &cardalloc; /* Sets the relative card address of an attatched memory card */ rca = SD_sendRca(mmc0,card); printf ("RCA sent is 0x%x ", rca); } /* Refer to mmc_setup example for explanation of the above code */ /* Fill in the handle's callback function structure with contents of the cback * * structure. These will be the functions called when the MMC interrupt occurs * 给中断安装调度程序 */ MMC_setCallBack(mmc0, &cback); /* Write to the MMCIE register to enable interrupts for particular events * 0x200 enables an interrupt on data transmit ready * Enables interrupts by writing to the MMCIE register */ MMC_intEnable(mmc0, 0x200); /* IRQ Enable interrupt register */ IRQ_globalEnable(); /* pick the card to transfer data to/from */ retVal = MMC_selectCard(mmc0, card); /* start data write. mmc_read_write example provides a more detailed explanation */ printf ("Writing data to card... "); /* Writes a block of data to a pre-selected memory card */ retVal = MMC_write(mmc0, /* MMC Handle returned by call to MMC_open */ 0x00000000,/* Address on card where read begins */ datasend, /* Pointer to buffer where received data should be stored */ 512); /* number of bytes to store in buffer */ for (retVal = 0; retVal <= 256; ++retVal) asm(" NOP"); /* Globally disables interrupts */ old_intm = IRQ_globalDisable(); /* Enable interrupts for data recieve ready now */ MMC_intEnable(mmc0, 0x400); /* Restores the global interrupt mask state */ IRQ_globalRestore(old_intm); /* delay before we start reading the data */ for (retVal = 0; retVal <= 25000; ++retVal) asm(" NOP"); for (retVal = 0; retVal <= 25000; ++retVal) asm(" NOP"); #if CHIP_5509A /* This requires a longer delay */ for (retVal = 0; retVal <= 25000; ++retVal) asm(" NOP"); for (retVal = 0; retVal <= 25000; ++retVal) asm(" NOP"); #endif printf ("Reading data from card... "); /* Reads a block of data from a pre-selected memory card */ retVal = MMC_read(mmc0,0x00000000,datareceive,512); /* check if data has been tranmitted and received correctly */ for (count = 0; count < 256; ++count) if (datasend[count] != datareceive[count]) break; if (count < 256) printf (" Not all data was transferred/read successfully! "); else printf (" Data transfer successful "); if (writes_done != 256) printf ("Not all data writes triggered interrupts "); else printf ("Interrupts triggered for each data transmit ready "); if (reads_done != 256) printf ("Not all data reads triggered interrupts "); else printf ("Interrupts triggered for each data receive ready "); if ((reads_done == 256) && (writes_done == 256)) printf ("TEST PASSED"); else printf ("TEST FAILED"); }
 

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