uarthw_c54xx_mcbsp.c
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上传日期:2008-01-29
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文件大小:11k
- /*
- * Copyright 2003 by Texas Instruments Incorporated.
- * All rights reserved. Property of Texas Instruments Incorporated.
- * Restricted rights to use, duplicate or disclose this code are
- * granted through contract.
- *
- */
- /* "@(#) DDK 1.11.00.00 11-04-03 (ddk-b13)" */
- /*
- * ======== uarthw_c54xx_mcbsp.c ========
- */
-
- #include <std.h>
- #include <hwi.h>
- #include <iom.h>
- #include <csl.h>
- #include <csl_mcbsp.h>
- #include <csl_irq.h>
- #include <csl_dma.h>
- #include <uarthw_mcbsp.h>
- static Int setupDma(MdUns *rxBuf, MdUns *txBuf, UARTHW_MCBSP_Params *params);
- static Int setupMcbsp(UARTHW_MCBSP_Params *params);
- static void enable(MdUns *txBuf);
- static MCBSP_Handle hMcbsp;
- static DMA_Handle hDmaRx;
- static DMA_Handle hDmaTx;
- static UARTHW_MCBSP_Params defaultParams = {
- MCBSP_PORT1, /* mcbspId */
- DMA_CHA4, /* dmaRxId */
- DMA_CHA5, /* dmaTxId */
- 100000000, /* mcbspClkIn (100MHz) */
- 115200, /* baud rate */
- UARTHW_MCBSP_INTR_MASK_DEFAULT
- };
- /*
- * ======== UARTHW_MCBSP_start ========
- */
- Int UARTHW_MCBSP_start(MdUns *rxBuf, MdUns *txBuf,
- UARTHW_MCBSP_Params *params)
- {
- Int status;
- Int rxId, txId;
- HWI_Attrs hwiAttrs;
- if (params == NULL) {
- params = &defaultParams;
- }
- status = setupMcbsp(params);
- if (status < 0) {
- return (status);
- }
- status = setupDma(rxBuf, txBuf, params);
- if (status < 0) {
- return (status);
- }
- rxId = DMA_getEventId(hDmaRx);
- txId = DMA_getEventId(hDmaTx);
-
- hwiAttrs.intrMask = params->intrMask.rxIntrMask;
- hwiAttrs.arg = NULL;
- HWI_dispatchPlug(rxId, (Fxn)UARTHW_MCBSP_dmaRxIsr, &hwiAttrs);
- hwiAttrs.intrMask = params->intrMask.txIntrMask;
- HWI_dispatchPlug(txId, (Fxn)UARTHW_MCBSP_dmaTxIsr, &hwiAttrs);
- IRQ_enable(rxId);
- IRQ_enable(txId);
- enable(txBuf);
- return (IOM_COMPLETED);
- }
- /*
- * ======== setupDma =======
- */
- static Int setupDma(MdUns *rxBuf, MdUns *txBuf, UARTHW_MCBSP_Params *params)
- {
- /*
- * I am using the stack extensively during initialization as I dont
- * require these structures after initialization.
- */
- Uns dmaTxSynEvt, dmaRxSynEvt;
- DMA_AdrPtr dmaTxDest, dmaRxSrc;
-
- DMA_GblConfig dmaGblCfg = {
- 0x00, /* Breakpoint Emulation Behavior (FREE) */
- NULL, /* Source Program Page Address Register(DMSRCP)-Symbolic */
- NULL, /* Destination Program Page Address Register(DMDSTP)-Symbolic */
- 0x0000, /* Element Address Index Register 0 (DMIDX0) */
- 0x0000, /* Frame Address Index Register 0 (DMFRI0) */
- 0x0000, /* Element Address Index Register 1 (DMIDX1) */
- 0x0000, /* Frame Address Index Register 1 (DMFRI1) */
- NULL, /* Global Source Address Reload Register (DMGSA)-Symbolic */
- NULL, /* Global Destination Address Reload Register(DMGDA)-Symbolic */
- 0x0000, /* Global Element Count Reload Register (DMGCR) */
- 0x0000 /* Global Frame Count Reload Register (DMGFR) */
- };
-
- DMA_Config dmaTxCfg = {
- 0x0001, /* Channel Priority (0x0000 or 0x0001) */
- DMA_DMMCR_RMK(
- DMA_DMMCR_AUTOINIT_OFF,
- DMA_DMMCR_DINM_ON,
- DMA_DMMCR_IMOD_HALF_AND_FULL,
- DMA_DMMCR_CTMOD_ABU,
- DMA_DMMCR_SIND_POSTINC,
- DMA_DMMCR_DMS_DATA,
- DMA_DMMCR_DIND_NOMOD,
- DMA_DMMCR_DMD_DATA
- ), /* Transfer Mode Control Register (DMMCR) */
- DMA_DMSFC_RMK(
- 0,
- DMA_DMSFC_DBLW_OFF,
- DMA_DMSFC_FRAMECNT_OF(0)
- ), /* Sync Event and Frame Count Register (DMSFC) */
- (DMA_AdrPtr)0, /* Source Address Register (DMSRC) - Symbolic */
- (DMA_AdrPtr)0, /* Destination Address Register (DMDST) - Symbolic */
- 2 * UARTHW_MCBSP_TxPKTBITS /* Element Count Register (DMCTR) */
- };
-
- DMA_Config dmaRxCfg = {
- 0x0001, /* Channel Priority (0x0000 or 0x0001) */
- DMA_DMMCR_RMK(
- DMA_DMMCR_AUTOINIT_OFF,
- DMA_DMMCR_DINM_ON,
- DMA_DMMCR_IMOD_HALF_AND_FULL,
- DMA_DMMCR_CTMOD_ABU,
- DMA_DMMCR_SIND_NOMOD,
- DMA_DMMCR_DMS_DATA,
- DMA_DMMCR_DIND_POSTINC,
- DMA_DMMCR_DMD_DATA
- ), /* Transfer Mode Control Register (DMMCR) */
- DMA_DMSFC_RMK(
- 0,
- DMA_DMSFC_DBLW_OFF,
- DMA_DMSFC_FRAMECNT_OF(0)
- ), /* Sync Event and Frame Count Register (DMSFC) */
- (DMA_AdrPtr)0, /* Source Address Register (DMSRC) - Symbolic */
- (DMA_AdrPtr)0, /* Destination Address Register (DMDST) - Symbolic */
- 2 * UARTHW_MCBSP_RxPKTBITS /* Element Count Register (DMCTR) */
- };
- if (params->mcbspId == MCBSP_PORT1) {
- dmaRxSynEvt = DMA_DMSFC_DSYN_REVT1;
- dmaTxSynEvt = DMA_DMSFC_DSYN_XEVT1;
- dmaTxDest = (DMA_AdrPtr)MCBSP_ADDR(DXR11);
- dmaRxSrc = (DMA_AdrPtr)MCBSP_ADDR(DRR11);
- }
- else {
- dmaRxSynEvt = DMA_DMSFC_DSYN_REVT0;
- dmaTxSynEvt = DMA_DMSFC_DSYN_XEVT0;
- dmaTxDest = (DMA_AdrPtr)MCBSP_ADDR(DXR10);
- dmaRxSrc = (DMA_AdrPtr)MCBSP_ADDR(DRR10);
- }
-
- hDmaRx = DMA_open(params->dmaRxId, DMA_OPEN_RESET);
- hDmaTx = DMA_open(params->dmaTxId, DMA_OPEN_RESET);
- if (hDmaTx == INV || hDmaRx == INV) {
- return (IOM_EBADIO);
- }
- dmaTxCfg.dmsrc = (DMA_AdrPtr)(&txBuf[1]);
- dmaTxCfg.dmdst = dmaTxDest;
- dmaTxCfg.dmsfc = _DMA_DMSFC_DSYN_MK(dmaTxSynEvt);
-
- DMA_config(hDmaTx, &dmaTxCfg);
-
- dmaRxCfg.dmdst = (DMA_AdrPtr)(&rxBuf[0]);
- dmaRxCfg.dmsrc = dmaRxSrc;
- dmaRxCfg.dmsfc = _DMA_DMSFC_DSYN_MK(dmaRxSynEvt);
- DMA_config(hDmaRx, &dmaRxCfg);
- DMA_globalConfig(0x0FFFF, &dmaGblCfg);
- /* Set value of Global Index Register, DMIDX0 */
- DMA_RSET(DMIDX0, 0);
- DMA_RSET(DMIDX1, 0);
- /* Set FREE bit in DMPREC to enable free run on DMA */
- DMA_FSET(DMPREC, FREE, 1);
- return (IOM_COMPLETED);
- }
- /*
- * ======== setupMcbsp ========
- * This function is used to setup the McBSP port chosen with the initial
- * settings based on parity, stopbits, databits,baudrates chosen.
- */
- static Int setupMcbsp(UARTHW_MCBSP_Params *params)
- {
- /*
- * I am using the stack extensively during initialization as I dont
- * require these structures after initialization.
- */
- Uns clkdv;
- MCBSP_Config mcbspCfg = {
- MCBSP_SPCR1_RMK(
- MCBSP_SPCR1_DLB_OFF,
- MCBSP_SPCR1_RJUST_DEFAULT,
- MCBSP_SPCR1_CLKSTP_DISABLE,
- MCBSP_SPCR1_DXENA_DEFAULT,
- MCBSP_SPCR1_RINTM_RRDY,
- MCBSP_SPCR1_RRST_DISABLE
- ), /* SPCR1 */
- MCBSP_SPCR2_RMK(
- MCBSP_SPCR2_FREE_NO,
- MCBSP_SPCR2_SOFT_YES,
- MCBSP_SPCR2_FRST_DEFAULT,
- MCBSP_SPCR2_GRST_DEFAULT,
- MCBSP_SPCR2_XINTM_XRDY,
- MCBSP_SPCR2_XSYNCERR_NO
- ), /* SPCR2 */
- MCBSP_RCR1_RMK(
- MCBSP_RCR1_RFRLEN1_OF(
- UARTHW_MCBSP_DATABITS + UARTHW_MCBSP_PARITYBITS),
- MCBSP_RCR1_RWDLEN1_16BIT
- ), /* RCR1 */
- MCBSP_RCR2_RMK(
- MCBSP_RCR2_RPHASE_DUAL,
- MCBSP_RCR2_RFRLEN2_OF(UARTHW_MCBSP_RxHSTOPBITS - 1),
- MCBSP_RCR2_RWDLEN2_8BIT,
- MCBSP_RCR2_RCOMPAND_MSB,
- MCBSP_RCR2_RFIG_NO,
- MCBSP_RCR2_RDATDLY_1BIT
- ), /* RCR2 */
- MCBSP_XCR1_RMK(
- MCBSP_XCR1_XFRLEN1_OF(
- UARTHW_MCBSP_DATABITS + UARTHW_MCBSP_PARITYBITS),
- MCBSP_XCR1_XWDLEN1_16BIT
- ), /* XCR1 */
- MCBSP_XCR2_RMK(
- MCBSP_XCR2_XPHASE_DUAL,
- MCBSP_XCR2_XFRLEN2_OF(UARTHW_MCBSP_TxHSTOPBITS - 1),
- MCBSP_XCR2_XWDLEN2_8BIT,
- MCBSP_XCR2_XCOMPAND_MSB,
- MCBSP_XCR2_XFIG_YES,
- MCBSP_XCR2_XDATDLY_0BIT
- ), /* XCR2 */
- MCBSP_SRGR1_RMK(
- MCBSP_SRGR1_FWID_OF(0),
- MCBSP_SRGR1_CLKGDV_OF(1)
- ), /* SRGR1 */
- MCBSP_SRGR2_RMK(
- MCBSP_SRGR2_GSYNC_FREE,
- MCBSP_SRGR2_CLKSP_RISING,
- MCBSP_SRGR2_CLKSM_INTERNAL,
- MCBSP_SRGR2_FSGM_DXR2XSR,
- 0
- ),
- 0x0000u, /* MCR1 */
- 0x0000u, /* MCR2 */
- MCBSP_PCR_RMK(
- MCBSP_PCR_XIOEN_SP,
- MCBSP_PCR_RIOEN_SP,
- MCBSP_PCR_FSXM_INTERNAL,
- MCBSP_PCR_FSRM_EXTERNAL,
- MCBSP_PCR_CLKXM_OUTPUT,
- MCBSP_PCR_CLKRM_OUTPUT,
- MCBSP_PCR_FSXP_ACTIVELOW,
- MCBSP_PCR_FSRP_ACTIVELOW,
- MCBSP_PCR_CLKXP_RISING,
- MCBSP_PCR_CLKRP_FALLING
- ), /* PCR */
- 0x0000u, /* RCERA */
- 0x0000u, /* RCERB */
- 0x0000u, /* XCERA */
- 0x0000u, /* XCERB */
- };
- hMcbsp = MCBSP_open(params->mcbspId, MCBSP_OPEN_RESET);
- if (hMcbsp == INV) {
- return (IOM_EBADIO);
- }
- /*
- * Here we compute the bit rate of the McBSP. Each UART bit is
- * represented by 16 McBSP bits.
- */
- clkdv = (Uns)(params->mcbspClkIn / (params->baud * 16));
-
- /* clkdv is max 8-bits long, so make sure we didn't overflow ... */
- if (clkdv > 0xff) {
- return (IOM_EBADARGS);
- }
- mcbspCfg.srgr1 = clkdv;
-
- MCBSP_config(hMcbsp, &mcbspCfg);
- return (IOM_COMPLETED);
- }
- /*
- * ======== enable ========
- * This function is used to enable the McBSP and start DMA
- */
- static void enable(MdUns *txBuf)
- {
- /* Take MCBSP receive and transmit out of reset */
- MCBSP_start(hMcbsp, MCBSP_RCV_START | MCBSP_XMIT_START, 0xFFFF);
- /* Prime MCBSP DXR */
- while (!MCBSP_xrdy(hMcbsp)) {
- ;
- }
- MCBSP_write(hMcbsp, txBuf[0]);
-
- DMA_start(hDmaTx);
- DMA_start(hDmaRx);
-
- /* Start the MCBSP and Sample Rate Generator */
- MCBSP_start(hMcbsp, MCBSP_SRGR_START, 0xFFFF);
- }