/*
* initEdma() - Initialize the DMA controller. Use linked transfers to
* automatically transition from ping to pong and visa-versa.
*/
void initEdma(void)
{
/* Configure transmit channel */
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // get hEdmaXmt handle and reset channel
hEdmaReloadXmtPing = EDMA_allocTable(-1); // get hEdmaReloadXmtPing handle
hEdmaReloadXmtPong = EDMA_allocTable(-1); // get hEdmaReloadXmtPong handle
gEdmaConfigXmt.dst = MCBSP_getXmtAddr(hMcbsp1); // set the desination address to McBSP1 DXR
gXmtChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigXmt.opt |= EDMA_FMK(OPT,TCC,gXmtChan); // set TCC to gXmtChan
EDMA_config(hEdmaXmt, &gEdmaConfigXmt); // then configure the registers
EDMA_config(hEdmaReloadXmtPing, &gEdmaConfigXmt); // and the reload for Ping
gEdmaConfigXmt.src = EDMA_SRC_OF(gBufferXmtPong); // change the structure to have a source of Pong
EDMA_config(hEdmaReloadXmtPong, &gEdmaConfigXmt); // and configure the reload for Pong
EDMA_link(hEdmaXmt,hEdmaReloadXmtPong); // link the regs to Pong
EDMA_link(hEdmaReloadXmtPong,hEdmaReloadXmtPing); // link Pong to Ping
EDMA_link(hEdmaReloadXmtPing,hEdmaReloadXmtPong); // and link Ping to Pong
/* Configure receive channel */
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // get hEdmaRcv handle and reset channel
hEdmaReloadRcvPing = EDMA_allocTable(-1); // get hEdmaReloadRcvPing handle
hEdmaReloadRcvPong = EDMA_allocTable(-1); // get hEdmaReloadRcvPong handle
gEdmaConfigRcv.src = MCBSP_getRcvAddr(hMcbsp1); // and the desination address to McBSP1 DXR
gRcvChan = EDMA_intAlloc(-1); // get an open TCC
gEdmaConfigRcv.opt |= EDMA_FMK(OPT,TCC,gRcvChan); // set TCC to gRcvChan
EDMA_config(hEdmaRcv, &gEdmaConfigRcv); // then configure the registers
EDMA_config(hEdmaReloadRcvPing, &gEdmaConfigRcv); // and the reload for Ping
gEdmaConfigRcv.dst = EDMA_DST_OF(gBufferRcvPong); // change the structure to have a destination of Pong
EDMA_config(hEdmaReloadRcvPong, &gEdmaConfigRcv); // and configure the reload for Pong
EDMA_link(hEdmaRcv,hEdmaReloadRcvPong); // link the regs to Pong
EDMA_link(hEdmaReloadRcvPong,hEdmaReloadRcvPing); // link Pong to Ping
EDMA_link(hEdmaReloadRcvPing,hEdmaReloadRcvPong); // and link Ping to Pong
/* Enable interrupts in the EDMA controller */
EDMA_intClear(gXmtChan);
EDMA_intClear(gRcvChan); // clear any possible spurious interrupts
EDMA_intEnable(gXmtChan); // enable EDMA interrupts (CIER)
EDMA_intEnable(gRcvChan); // enable EDMA interrupts (CIER)
EDMA_enableChannel(hEdmaXmt); // enable EDMA channel
EDMA_enableChannel(hEdmaRcv); // enable EDMA channel
/* Do a dummy write to generate the first McBSP transmit event */
MCBSP_write(hMcbsp1, 0);
}
/* Transmit side EDMA configuration */
EDMA_Config gEdmaConfigXmt = {
EDMA_FMKS(OPT, PRI, HIGH) | // Priority
EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size
EDMA_FMKS(OPT, 2DS, NO) | // 2 dimensional source?
EDMA_FMKS(OPT, SUM, INC) | // Src update mode
EDMA_FMKS(OPT, 2DD, NO) | // 2 dimensional dest
EDMA_FMKS(OPT, DUM, NONE) | // Dest update mode
EDMA_FMKS(OPT, TCINT, YES) | // Cause EDMA interrupt?
EDMA_FMKS(OPT, TCC, OF(0)) | // Transfer complete code
EDMA_FMKS(OPT, LINK, YES) | // Enable link parameters?
EDMA_FMKS(OPT, FS, NO), // Use frame sync?
(Uint32)&gBufferXmtPing, // Src address
EDMA_FMK (CNT, FRMCNT, NULL) | // Frame count
EDMA_FMK (CNT, ELECNT, BUFFSIZE), // Element count
EDMA_FMKS(DST, DST, OF(0)), // Dest address
EDMA_FMKS(IDX, FRMIDX, DEFAULT) | // Frame index value
EDMA_FMKS(IDX, ELEIDX, DEFAULT), // Element index value
EDMA_FMK (RLD, ELERLD, NULL) | // Reload element
EDMA_FMK (RLD, LINK, NULL) // Reload link
};
/* Receive side EDMA configuration */
EDMA_Config gEdmaConfigRcv = {
EDMA_FMKS(OPT, PRI, HIGH) | // Priority
EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size
void config_EDMA(void)
{
LOG_printf(&myLog, "config EDMA begin");
// EIGEN!!!: Konfiguration Recieve Ping
/* Konfiguration der EDMA zum Lesen*/
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // EDMA Channel for REVT1
hEdmaReloadRcvPing = EDMA_allocTable(-1); // Reload-Parameters Ping
hEdmaReloadRcvPong = EDMA_allocTable(-1); // Reload-Parameters Pong 2 Param Sets needed (Ping & Pong) -> Pong write on my own
hEdmaReloadRcvPeng = EDMA_allocTable(-1); // Reload-Parameters Peng
configEDMARcv.src = MCBSP_getRcvAddr(hMcbsp); // source addr
//Recieve Ping
tccRcvPing = EDMA_intAlloc(-1); // next available TCC
configEDMARcv.opt |= EDMA_FMK(OPT,TCC,tccRcvPing); // Grundkonfiguration EDMA-channel
configEDMARcv.dst = ((int)Buffer_in_ping)/* & 0xFFFF*/; // Zieladresse
//configEDMARcv.dst = ((short)Buffer_in_ping)/* & 0xFFFF*/; // Zieladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaRcv, &configEDMARcv);
EDMA_config(hEdmaReloadRcvPing, &configEDMARcv);
//Recieve Pong
tccRcvPong = EDMA_intAlloc(-1); // next available TCC
configEDMARcv.opt |= EDMA_FMK(OPT,TCC,tccRcvPong); // Grundkonfiguration EDMA-channel
configEDMARcv.dst = ((int)Buffer_in_pong)/* & 0xFFFF*/; // Zieladresse
//configEDMARcv.dst = ((short)Buffer_in_pong)/* & 0xFFFF*/; // Zieladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaReloadRcvPong, &configEDMARcv);
//Recieve Peng
tccRcvPeng = EDMA_intAlloc(-1); // next available TCC
configEDMARcv.opt |= EDMA_FMK(OPT,TCC,tccRcvPeng); // Grundkonfiguration EDMA-channel
configEDMARcv.dst = ((int)Buffer_in_peng)/* & 0xFFFF*/; // Zieladresse
//configEDMARcv.dst = ((short)Buffer_in_peng)/* & 0xFFFF*/; // Zieladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaReloadRcvPeng, &configEDMARcv);
/* link transfers ping -> pong -> peng -> ping */
EDMA_link(hEdmaRcv,hEdmaReloadRcvPong);
EDMA_link(hEdmaReloadRcvPong,hEdmaReloadRcvPeng);
EDMA_link(hEdmaReloadRcvPeng,hEdmaReloadRcvPing);
EDMA_link(hEdmaReloadRcvPing,hEdmaReloadRcvPong);
/* do you want to hear music? */
// Gleiche Konfiguration wie oben für Lesen muss nun für Schreiben angewendet werden
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // EDMA Channel for REVT1
hEdmaReloadXmtPing = EDMA_allocTable(-1); // Reload-Parameters Ping
hEdmaReloadXmtPong = EDMA_allocTable(-1); // Reload-Parameters Pong 2 Param Sets needed (Ping & Pong) -> Pong write on my own
hEdmaReloadXmtPeng = EDMA_allocTable(-1); // Reload-Parameters Peng
configEDMAXmt.dst = MCBSP_getXmtAddr(hMcbsp); // destination addr
//Transmit Ping
tccXmtPing = EDMA_intAlloc(-1); // next available TCC
configEDMAXmt.opt |= EDMA_FMK(OPT,TCC,tccXmtPing); // Grundkonfiguration EDMA-channel
configEDMAXmt.src = ((int)Buffer_out_ping)/* & 0xFFFF*/; // Quelladresse
//configEDMAXmt.src = ((short)Buffer_out_ping)/* & 0xFFFF*/; // Quelladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaXmt, &configEDMAXmt);
EDMA_config(hEdmaReloadXmtPing, &configEDMAXmt);
//Transmit Pong
tccXmtPong = EDMA_intAlloc(-1); // next available TCC
configEDMAXmt.opt |= EDMA_FMK(OPT,TCC,tccXmtPong); // Grundkonfiguration EDMA-channel
configEDMAXmt.src = ((int)Buffer_out_pong)/* & 0xFFFF*/; // Quelladresse
//configEDMAXmt.src = ((short)Buffer_out_pong)/* & 0xFFFF*/; // Quelladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaReloadXmtPong, &configEDMAXmt);
//Transmit Peng
tccXmtPeng = EDMA_intAlloc(-1); // next available TCC
configEDMAXmt.opt |= EDMA_FMK(OPT,TCC,tccXmtPeng); // Grundkonfiguration EDMA-channel
configEDMAXmt.src = ((int)Buffer_out_peng)/* & 0xFFFF*/; // Quelladresse
//configEDMAXmt.src = ((short)Buffer_out_peng)/* & 0xFFFF*/; // Quelladresse
/* Erster Transfer und Reload-Ping */
EDMA_config(hEdmaReloadXmtPeng, &configEDMAXmt);
/* link transfers ping -> pong -> ping */
EDMA_link(hEdmaXmt,hEdmaReloadXmtPong);
EDMA_link(hEdmaReloadXmtPong,hEdmaReloadXmtPeng);
EDMA_link(hEdmaReloadXmtPeng,hEdmaReloadXmtPing);
EDMA_link(hEdmaReloadXmtPing,hEdmaReloadXmtPong);
/* enable EDMA TCC */
//recieve ping
EDMA_intClear(tccRcvPing);
EDMA_intEnable(tccRcvPing);
//recieve pong
EDMA_intClear(tccRcvPong);
EDMA_intEnable(tccRcvPong);
//recieve peng
EDMA_intClear(tccRcvPeng);
EDMA_intEnable(tccRcvPeng);
//transmit ping
EDMA_intClear(tccXmtPing);
EDMA_intEnable(tccXmtPing);
//transmit pong
EDMA_intClear(tccXmtPong);
EDMA_intEnable(tccXmtPong);
//transmit peng
EDMA_intClear(tccXmtPeng);
EDMA_intEnable(tccXmtPeng);
/* which EDMAs do we have to enable? */
EDMA_enableChannel(hEdmaRcv);
EDMA_enableChannel(hEdmaXmt);
LOG_printf(&myLog, "config EDMA end");
}
EDMA_Config configEDMARcv =
{
EDMA_FMKS(OPT, PRI, LOW) | // auf beide Queues verteilen
EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size EIGEN!!!: Im Foliensatz so gefunden, bin aber nicht sicher, hat das überhaupt große Auswirkung?
EDMA_FMKS(OPT, 2DS, NO) | // kein 2D-Transfer
EDMA_FMKS(OPT, SUM, NONE) | // Quell-update mode -> FEST (McBSP)!!!
EDMA_FMKS(OPT, 2DD, NO) | // 2kein 2D-Transfer
EDMA_FMKS(OPT, DUM, INC) | // Ziel-update mode EIGEN!!!: Ziel-Adresse wird nicht aktualisiert, immer die selbe
EDMA_FMKS(OPT, TCINT, YES) | // EDMA interrupt erzeugen? EIGEN!!!: EDMA muss Interrupts erzeugen!
EDMA_FMKS(OPT, TCC, OF(0)) | // Transfer complete code (TCC)
EDMA_FMKS(OPT, LINK, YES) | // Link Parameter nutzen?
EDMA_FMKS(OPT, FS, NO), // Frame Sync nutzen?
EDMA_FMKS(SRC, SRC, OF(0)), // Quell-Adresse
EDMA_FMK (CNT, FRMCNT, NULL) | // Anzahl Frames
EDMA_FMK (CNT, ELECNT, BUFFER_LEN), // Anzahl Elemente
(Uint32)Buffer_in_ping, // Ziel-Adresse Zur Laufzeit zu Pong-Adresse ändern und selbe Konfiguration verwenden?
EDMA_FMKS(IDX, FRMIDX, DEFAULT) | // Frame index Wert
EDMA_FMKS(IDX, ELEIDX, DEFAULT), // Element index Wert
EDMA_FMK (RLD, ELERLD, NULL) | // Reload Element
EDMA_FMK (RLD, LINK, NULL) // Reload Link
};
EDMA_Config configEDMAXmt = /* Parameter nochmal überprüfen!!!!!!! */
{
EDMA_FMKS(OPT, PRI, LOW) | // auf beide Queues verteilen
EDMA_FMKS(OPT, ESIZE, 16BIT) | // Element size EIGEN!!!: Im Foliensatz so gefunden, bin aber nicht sicher, hat das überhaupt große Auswirkung?
void config_EDMA(void)
{
/* Konfiguration der EDMA zum Lesen*/
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET); // EDMA Kanal für das Event REVT1
hEdmaRcvRelPing = EDMA_allocTable(-1); // einen Reload-Parametersatz für Ping
hEdmaRcvRelPong = EDMA_allocTable(-1); // einen Reload-Parametersatz für Pong
configEDMARcv.src = MCBSP_getRcvAddr(hMcbsp); // Quell-Adresse zum Lesen
tccRcvPing = EDMA_intAlloc(-1); // nächsten freien Transfer-Complete-Code Ping
tccRcvPong = EDMA_intAlloc(-1); // nächsten freien Transfer-Complete-Code Pong
configEDMARcv.opt |= EDMA_FMK(OPT,TCC,tccRcvPing); // dann der Grundkonfiguration des EDMA Empfangskanals zuweisen
/* ersten Transfer und Reload-Ping mit ConfigPing konfigurieren */
EDMA_config(hEdmaRcv, &configEDMARcv);
EDMA_config(hEdmaRcvRelPing, &configEDMARcv);
/* braucht man auch noch andere EDMA-Konfigurationen fuer das Lesen? ja -> pong */
configEDMARcv.opt |= EDMA_FMK(OPT,TCC,tccRcvPong);
configEDMARcv.dst = (Uint32)Buffer_in_pong ;
EDMA_config(hEdmaRcvRelPong, &configEDMARcv);
/* Transfers verlinken ping -> pong -> ping */
EDMA_link(hEdmaRcv, hEdmaRcvRelPong); /* noch mehr verlinken? */
EDMA_link(hEdmaRcvRelPong, hEdmaRcvRelPing);
EDMA_link(hEdmaRcvRelPing, hEdmaRcvRelPong);
/* muss man mittels EDMA auch schreiben? */
/* Konfiguration der EDMA zum Schreiben */
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET); // EDMA Kanal für das Event REVT1
hEdmaXmtRelPing = EDMA_allocTable(-1); // einen Reload-Parametersatz für Ping
hEdmaXmtRelPong = EDMA_allocTable(-1); // einen Reload-Parametersatz für Pong
configEDMAXmt.dst = MCBSP_getXmtAddr(hMcbsp); // Ziel-Adresse zum Schreiben
tccXmtPing = EDMA_intAlloc(-1); // nächsten freien Transfer-Complete-Code Ping
tccXmtPong = EDMA_intAlloc(-1); // nächsten freien Transfer-Complete-Code Pong
configEDMAXmt.opt |= EDMA_FMK(OPT,TCC,tccXmtPing); // dann der Grundkonfiguration des EDMA Sendekanal zuweisen
/* ersten Transfer und Reload-Ping mit ConfigPing konfigurieren */
EDMA_config(hEdmaXmt, &configEDMAXmt);
EDMA_config(hEdmaXmtRelPing, &configEDMAXmt);
/* braucht man auch noch andere EDMA-Konfigurationen fuer das Schreiben? ja -> pong */
configEDMAXmt.opt |= EDMA_FMK(OPT,TCC,tccXmtPong);
configEDMAXmt.src = (Uint32)Buffer_out_pong ;
EDMA_config(hEdmaXmtRelPong, &configEDMAXmt);
/* Transfers verlinken ping -> pong -> ping */
EDMA_link(hEdmaXmt, hEdmaXmtRelPong); /* noch mehr verlinken? */
EDMA_link(hEdmaXmtRelPong, hEdmaXmtRelPing);
EDMA_link(hEdmaXmtRelPing, hEdmaXmtRelPong);
/* EDMA TCC-Interrupts freigeben */
EDMA_intClear(tccRcvPing);
EDMA_intEnable(tccRcvPing);
EDMA_intClear(tccRcvPong);
EDMA_intEnable(tccRcvPong);
/* sind das alle? nein -> pong und alle für Sendeseite */
EDMA_intClear(tccXmtPing);
EDMA_intEnable(tccXmtPing);
EDMA_intClear(tccXmtPong);
EDMA_intEnable(tccXmtPong);
/* EDMA starten, wen alles? */
EDMA_enableChannel(hEdmaRcv);
EDMA_enableChannel(hEdmaXmt);
}
void DSK6713_configure_AIC23() {
/* Configure McBSP0 as control interface for aic23 */
MCBSP_Handle MCBSP0_handle;
MCBSP0_handle = MCBSP_open(MCBSP_DEV0, MCBSP_OPEN_RESET);
MCBSP_config(MCBSP0_handle, &MCBSP0_config);
MCBSP_start(MCBSP0_handle, MCBSP_XMIT_START | MCBSP_SRGR_START | MCBSP_SRGR_START, 220);
set_aic23_register(MCBSP0_handle, RESET_REGISTER, 0x0000);
set_aic23_register(MCBSP0_handle, POWER_DOWN_CONTROL, 0x0000);
set_aic23_register(MCBSP0_handle, LEFT_LINE_INPUT_CHANNEL_VOLUME, 0x0017);
set_aic23_register(MCBSP0_handle, RIGHT_LINE_INPUT_CHANNEL_VOLUME, 0x0017);
set_aic23_register(MCBSP0_handle, LEFT_CHANNEL_HEADPHONE_VOLUME, 0x00f9);
set_aic23_register(MCBSP0_handle, RIGHT_CHANNEL_HEADPHONE_VOLUME, 0x00f9);
set_aic23_register(MCBSP0_handle, ANALOG_AUDIO_PATH, 0x0011); // 00001 0010
set_aic23_register(MCBSP0_handle, DIGITAL_AUDIO_PATH, 0x0000); // 000000000
set_aic23_register(MCBSP0_handle, DIGITAL_AUDIO_INTERFACE_FORMAT, 0x0043); //0 0100 0001
set_aic23_register(MCBSP0_handle, SAMPLE_RATE_CONTROL, 0x000d); // 01100
set_aic23_register(MCBSP0_handle, DIGITAL_INTERFACE_ACTIVATION, 0x0001);
/* Configure McBSP1 as data interface for aic23 */
MCBSP_Handle MCBSP1_handle;
MCBSP1_handle = MCBSP_open(MCBSP_DEV1, MCBSP_OPEN_RESET);
MCBSP_config(MCBSP1_handle, &MCBSP1_config);
MCBSP_start(MCBSP1_handle, MCBSP_XMIT_START|MCBSP_RCV_START|MCBSP_SRGR_FRAMESYNC|MCBSP_SRGR_START, 220);
/* Configure receive EDMA */
EDMA_Handle hEdmaRcv;
EDMA_Handle hEdmaRcvA;
EDMA_Handle hEdmaRcvB;
hEdmaRcv = EDMA_open(EDMA_CHA_REVT1, EDMA_OPEN_RESET);
hEdmaRcvA = EDMA_allocTable(-1);
hEdmaRcvB = EDMA_allocTable(-1);
gEdmaRcvConfig.src = MCBSP_getRcvAddr(MCBSP1_handle); // Get address of DRR
gTccRcvChan = EDMA_intAlloc(-1); // get next free transfer complete code
gEdmaRcvConfig.opt |= EDMA_FMK(OPT, TCC, gTccRcvChan);
EDMA_config(hEdmaRcv, &gEdmaRcvConfig);
EDMA_config(hEdmaRcvA, &gEdmaRcvConfig);
gEdmaRcvConfig.dst = EDMA_DST_OF(gRcvBufferB);
EDMA_config(hEdmaRcvB, &gEdmaRcvConfig);
EDMA_link(hEdmaRcv, hEdmaRcvB);
EDMA_link(hEdmaRcvB, hEdmaRcvA);
EDMA_link(hEdmaRcvA, hEdmaRcvB);
/* Configure transmit EDMA */
EDMA_Handle hEdmaXmt;
EDMA_Handle hEdmaXmtA;
EDMA_Handle hEdmaXmtB;
hEdmaXmt = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET);
hEdmaXmtA = EDMA_allocTable(-1);
hEdmaXmtB = EDMA_allocTable(-1);
gEdmaXmtConfig.dst = MCBSP_getXmtAddr(MCBSP1_handle); // Get address of DXR
gTccXmtChan = EDMA_intAlloc(-1); // get next free transfer complete code
gEdmaXmtConfig.opt |= EDMA_FMK(OPT, TCC, gTccXmtChan);
EDMA_config(hEdmaXmt, &gEdmaXmtConfig);
EDMA_config(hEdmaXmtA, &gEdmaXmtConfig);
gEdmaXmtConfig.src = EDMA_DST_OF(gXmtBufferB); // set source to buffer B
EDMA_config(hEdmaXmtB, &gEdmaXmtConfig);
EDMA_link(hEdmaXmt, hEdmaXmtB);
EDMA_link(hEdmaXmtB, hEdmaXmtA);
EDMA_link(hEdmaXmtA, hEdmaXmtB);
EDMA_intClear(gTccRcvChan);
EDMA_intClear(gTccXmtChan);
EDMA_intEnable(gTccRcvChan);
EDMA_intEnable(gTccXmtChan);
gBufferState.cpuBufferState = StateB; // inittial cpu buffer state
EDMA_enableChannel(hEdmaRcv);
EDMA_enableChannel(hEdmaXmt);
IRQ_clear(IRQ_EVT_EDMAINT);
IRQ_enable(IRQ_EVT_EDMAINT);
MCBSP_write(MCBSP1_handle, 0x00);
}
void conf_EDMA(){
/*
* Open EDMA channels to the REVT1 and XEVT1 interrupts
* issued from the MCBSP periphery. The channels still
* need to be configured properly with a parameterset
* and another parameterset that fills the pong Buffer.
*/
hEDMATrx = EDMA_open(EDMA_CHA_XEVT1, EDMA_OPEN_RESET);
/*
* Aquire EDMA tables that hold the reload tables for both,
* transmit and receive side bufferswitch.
*/
hEDMATrxPing = EDMA_allocTable(-1);
hEDMATrxPong = EDMA_allocTable(-1);
/*
* Set the EDMA source address. On the receive side we use
* the MCBSP source address and save it in the EDMA config
* handle. For the transmit side we will have a fixed
* destination but a variable source address, so we need to
* set the destination to a fixed address!
*/
conf_EDMA_oBuf.dst = MCBSP_getXmtAddr(hMcBsp);
/*
* The next step is to find free Transfer complete codes,
* save them to a variable so the EDMA hardware interrupt
* is able to distinguish between the RX and TX complete
* code. We *could* assign those as static codes, but it
* is better coding practice to make it variable to allow
* future expansion of the code.
*/
tccTrxPing = EDMA_intAlloc(-1);
conf_EDMA_oBuf.opt |= EDMA_FMK(OPT, TCC, tccTrxPing);
/*
* Configure the transmit and receive channel to write in the
* ping buffers. The function copies the struct into the
* EDMA parameter RAM. This allows us to reuse the configs
* to set up the reload configuration for the pong buffers.
*/
EDMA_config(hEDMATrx, &conf_EDMA_oBuf);
EDMA_config(hEDMATrxPing, &conf_EDMA_oBuf);
/*
* Now we are ready to configure the reload parametersets
* that will write to the pong buffers after the ping
* buffer is filled with data.
*/
/*
* First we need to set the destination and source of the
* corresponding pong buffers for both sides.
*/
conf_EDMA_oBuf.src = (uint32_t)oBufPong;
/*
* We also need a transfer complete code for the second
* configuration set to show that we indeed have finished
* the transfer to the pong buffers and switch to ping.
* To overwrite the ones written before we need to
* overwrite the whole 32 OPT bits
*/
tccTrxPong = EDMA_intAlloc(-1);
conf_EDMA_oBuf.opt = EDMA_FMKS(OPT, PRI, HIGH) |
EDMA_FMKS(OPT, ESIZE, 32BIT) |
EDMA_FMKS(OPT, 2DS, NO) |
EDMA_FMKS(OPT, SUM, INC) |
EDMA_FMKS(OPT, 2DD, NO) |
EDMA_FMKS(OPT, DUM, NONE) |
EDMA_FMKS(OPT, TCINT, YES) |
EDMA_FMKS(OPT, TCC, OF(0)) |
EDMA_FMKS(OPT, LINK, YES) |
EDMA_FMKS(OPT, FS, NO);
conf_EDMA_oBuf.opt |= EDMA_FMK(OPT, TCC, tccTrxPong);
/*
* Now we can write the pong buffer configs to the parameter RAM
* tables we aquired before by using EDMA_config()..
*/
EDMA_config(hEDMATrxPong, &conf_EDMA_oBuf);
/*
* We now need to link the transfers so the EDMA fires an interrupt
* whenever we finished a job and immediately starts to
* fill the other buffer (ping -> pong -> ping).
*/
EDMA_link(hEDMATrx, hEDMATrxPing);
EDMA_link(hEDMATrxPing, hEDMATrxPong);
EDMA_link(hEDMATrxPong, hEDMATrxPing);
/*
* Now we take precautions and clear all
* the interrupt sources so no interrupt
* can fire because of some wiggling bits
* caused by an unstable supply.
*/
EDMA_intClear(tccTrxPing);
EDMA_intClear(tccTrxPong);
/*
* Lets enable the interrupts, but we aren't
* done yet: There's still the global interrupt
* switch to be toggled by enable_INT() after
* we started the EDMA transfers.
*/
EDMA_intEnable(tccTrxPing);
EDMA_intEnable(tccTrxPong);
}