I am using UDP with the audio_edma_c6747.prj - the aim is to transmit audio (using ping and pong buffering) via UDP to another device (PC) that is connected to the DSP evaluation board (EVM OMAP L137/ c6747) via the ethernet cable.
When I configure the codec as slave and mcasp as master (as in the example), and when I transmit UDP with a rate of 16KHz, that is 16,000 words per second, everything works fine. But when I try to use 8KHz sampling rate, I hear a "tup" noise in the background. I have used the following configuration to program the sampling rate to be 8KHz. Since the EVM OMAP L137/c6747 doesnot support 8KHz in McASP (because maximum is 24MHz/32/32 = 23KHz, I have changed the oscillator near the codec from 24MHz to 2MHz. Even after changing codec as master and McASP as slave the issue doesnt get solved - that is, I still hear the tup noise in the background
I have been going around for days with this issue. still no solution. I have tried out having the NC_SystemOpen( NC_PRIORITY_HIGH, NC_OPMODE_INTERRUPT );, also using the oscilloscope I made sure that when sending the ping buffer using send() function, the send is done within the time taken to transmit the ping buffer- similarly for pong buffer. In wireshark the data is received perfectly from the DSP board, but when hearing via the speaker, I hear the "tup" sound in the background.
Also I tried to view the task graph (Exec Graph) - but it is disabled. How to enable it. I am using CCSV4.2.4.00033 and DSP/BIOS 5.41.10.36. I installed the latest version of SYS/BIOS, which is 6.33.01.25, but the ccsv4 tool wont allow me to use the BIOS version - because there is only a column for DSP/BIOS version under build properties/ccs build/DSP/BIOS support/ DSP/BIOS version - even if I brouse manually the location of SYS/BIOS it wont take it. The SYS/BIOS is already present in windows/preferences/CCS/RTSC/Products and repositories under SYS/BIOS.
#include "app.h"
#include "evmc6747.h"
#include "evmc6747_mcasp.h"
#include "aic3106.h"
//------------------------------------------------------------------------------
// Configuration Macros
//------------------------------------------------------------------------------
#define AIC3106_I2C_ADDR 0x18 // I2C address
//------------------------------------------------------------------------------
// Variables
//------------------------------------------------------------------------------
void *mcasp_xmt_register = (void *)(MCASP1_BASE + 0x214);
void *mcasp_rcv_register = (void *)(MCASP1_BASE + 0x280);
static MCASP_Handle mcasp;
//------------------------------------------------------------------------------
// Functions
//------------------------------------------------------------------------------
/* ------------------------------------------------------------------------ *
* *
* _AIC3106_rset( regnum, regval ) *
* *
* Set codec register regnum to value regval *
* *
* ------------------------------------------------------------------------ */
Int16 EVMC6747_AIC3106_rset( Uint16 regnum, Uint16 regval )
{
Uint8 cmd[2];
cmd[0] = regnum & 0x007F; // 7-bit Device Address
cmd[1] = regval; // 8-bit Register Data
return EVMC6747_I2C_write( AIC3106_I2C_ADDR, cmd, 2 );
}
void mcasp_close()
{
// Close Codec
EVMC6747_AIC3106_rset( AIC3106_PAGESELECT, 0 ); // Select Page 0
EVMC6747_AIC3106_rset( AIC3106_RESET, 0x80 ); // Reset the AIC3106
// Close McASP
mcasp->regs->SRCTL0 = 0; // Serializers
mcasp->regs->SRCTL1 = 0;
mcasp->regs->SRCTL2 = 0;
mcasp->regs->SRCTL3 = 0;
mcasp->regs->SRCTL5 = 0;
//mcasp->regs->SRCTL11 = 0;
//mcasp->regs->SRCTL12 = 0;
mcasp->regs->GBLCTL = 0; // Global Reset
}
void mcasp_open()
{
// Configure AIC3106
EVMC6747_AIC3106_rset( AIC3106_PAGESELECT, 0 ); // Select page 0
EVMC6747_AIC3106_rset( AIC3106_RESET, 0x80 ); // Reset AIC3106
/* ------------------------------------------------------------------------ *
* *
* AIC3106 Setup *
* *
* AIC3106.MCLK = PLL1705.SCK02 *
* FS = ( AIC3106.MCLK * K ) / ( 2048 * P ) *
* *
* For a FS=[48 kHz] & MCLK=[22.5792 MHz] *
* : 48kHz = ( 22.5792 MHz * K ) / ( 2048 * P ) *
* : P = 2, K[J.D] = 8.7075 *
* *
* ------------------------------------------------------------------------ */
// Configure AIC3106 registers
EVMC6747_AIC3106_rset( 2, 0xAA );
EVMC6747_AIC3106_rset( 3, 0xA1); // 5 PLL A <- [PLL=OFF][Q=4][P=2]
EVMC6747_AIC3106_rset( 4, 0xC0 ); // 4 PLL B <- [J=8]
EVMC6747_AIC3106_rset( 5, 0x0 ); // 5 PLL C <- [D=7075]
EVMC6747_AIC3106_rset( 6, 0x0 ); // 6 PLL D <- [D=7075]
EVMC6747_AIC3106_rset( 7, 0x0A ); // 7 Codec Datapath Setup <- [FS=48 kHz][LeftDAC=LEFT][RightDAC=RIGHT]
EVMC6747_AIC3106_rset( 8, 0x00 ); // 8 Audio Interface Control A <- [BCLK=Slave][MCLK=Slave]
EVMC6747_AIC3106_rset( 9, 0x00 ); // 9 Audio Interface Control B <- [I2S mode][16 bit]
EVMC6747_AIC3106_rset( 10, 0x00); // 10 Audio Interface Control C <- [Data offset=0]
EVMC6747_AIC3106_rset( 15, 0 ); // 15 Left ADC PGA Gain <- [Mute=OFF]
EVMC6747_AIC3106_rset( 16, 0 ); // 16 Right ADC PGA Gain <- [Mute=OFF]
EVMC6747_AIC3106_rset( 19, 0x04 ); // 19 LINE1L to Left ADC <- [SingleEnd][Gain=0dB][Power=ON][SoftStep=OncePerFS]
EVMC6747_AIC3106_rset( 22, 0x04 ); // 22 LINE1R to Right ADC <- [SingleEnd][Gain=0dB][Power=ON][SoftStep=OncePerFS]
EVMC6747_AIC3106_rset( 27, 0 ); // 27 Left AGC B <- [OFF]
EVMC6747_AIC3106_rset( 30, 0 ); // 30 Right AGC B <- [OFF]
EVMC6747_AIC3106_rset( 37, 0xE0 ); // 37 DAC Power & Output Dvr <- [LeftDAC=ON][RightDAC=ON][HPLCOM=SingleEnd]
EVMC6747_AIC3106_rset( 38, 0x10 ); // 38 High Power Output Dvr <- [HPRCOM=SingleEnd][ShortCircuit=OFF]
EVMC6747_AIC3106_rset( 43, 0 ); // 43 Left DAC Digital Volume <- [Mute=OFF][Gain=0dB]
EVMC6747_AIC3106_rset( 44, 0 ); // 44 Right DAC Digital Volume <- [Mute=OFF][Gain=0dB]
EVMC6747_AIC3106_rset( 47, 0x80 ); // 47 DAC_L1 to HPLOUT Volume <- [Routed]
EVMC6747_AIC3106_rset( 51, 0x09 ); // 51 HPLOUT Output <- [Mute=OFF][Power=ON]
EVMC6747_AIC3106_rset( 58, 0 ); // 58 HPLCOM Output <- []
EVMC6747_AIC3106_rset( 64, 0x80 ); // 64 DAC_R1 to HPROUT Volume <- [Routed]
EVMC6747_AIC3106_rset( 65, 0x09 ); // 65 HPROUT Output <- [Mute=OFF][Power=ON]
EVMC6747_AIC3106_rset( 72, 0 ); // 72 HPRCOM Output <- []
EVMC6747_AIC3106_rset( 82, 0x80 ); // 82 DAC_L1 to LEFT_LOP/M Volume <- [Routed]
EVMC6747_AIC3106_rset( 86, 0x09 ); // 83 LINE2R to LEFT_LOP/M Volume <- []
EVMC6747_AIC3106_rset( 92, 0x80 ); // 92 DAC_R1 to RIGHT_LOP/M Volume <- [Routed]
EVMC6747_AIC3106_rset( 93, 0x09 ); // 93 RIGHT_LOP/M Output <- [Mute=OFF][Power=ON]
EVMC6747_AIC3106_rset( 101, 0x00 ); // 101 GPIO Control Register B <- [CODEC_CLKIN = CLKDIV_OUT]
EVMC6747_AIC3106_rset( 102, 0 ); // 102 Clock Generation Control <- [PLLCLK_IN and CLKDIV_IN use MCLK]
// Initialize MCASP1
mcasp = &MCASP_MODULE_1;
/* ---------------------------------------------------------------- *
* *
* McASP1 is in MASTER mode. *
* BCLK & WCLK come from McASP1 *
* DIN is used by write16/write32 *
* DOUT is usec by read16/read32 *
* *
* ---------------------------------------------------------------- */
mcasp->regs->GBLCTL = 0; // Reset
mcasp->regs->RGBLCTL = 0; // Reset RX
mcasp->regs->XGBLCTL = 0; // Reset TX
mcasp->regs->PWRDEMU = 1; // Free-running
// RX
mcasp->regs->RMASK = 0xffffffff; // No padding used
mcasp->regs->RFMT = 0x00018078; // MSB 16bit, 1-delay, no pad, CFGBus
mcasp->regs->AFSRCTL = 0x00000112; // 2TDM, 1bit Rising, INTERNAL FS, word
mcasp->regs->ACLKRCTL = 0x000000A7; // Rising INTERNAL CLK,(from tx side)
mcasp->regs->AHCLKRCTL = 0x00000000; // INT CLK (from tx side)
mcasp->regs->RTDM = 0x00000003; // Slots 0,1
mcasp->regs->RINTCTL = 0x00000000; // Not used
mcasp->regs->RCLKCHK = 0x00FF0001; // 255-MAX 0-MIN, div-by-256
// TX
mcasp->regs->XMASK = 0xffffffff; // No padding used
mcasp->regs->XFMT = 0x00018078; // MSB 16bit, 1-delay, no pad, CFGBus
mcasp->regs->AFSXCTL = 0x00000112; // 2TDM, 1bit Rising edge INTERNAL FS, word
mcasp->regs->ACLKXCTL = 0x000000A7; // ASYNC, Rising INTERNAL CLK, div-by-16
mcasp->regs->AHCLKXCTL = 0x00000000; // EXT CLK
mcasp->regs->XTDM = 0x00000003; // Slots 0,1
mcasp->regs->XINTCTL = 0x00000000; // Not used
mcasp->regs->XCLKCHK = 0x00FF0001; // 255-MAX 0-MIN, div-by-256
mcasp->regs->SRCTL5 = 0x000D; // MCASP1.AXR1[5] --> DIN
mcasp->regs->SRCTL0 = 0x000E; // MCASP1.AXR1[0] <-- DOUT
mcasp->regs->PFUNC = 0; // All MCASPs
mcasp->regs->PDIR = 0x14000020; // All inputs except AXR0[5], ACLKX1, AFSX1
mcasp->regs->DITCTL = 0x00000000; // Not used
mcasp->regs->DLBCTL = 0x00000000; // Not used
mcasp->regs->AMUTE = 0x00000000; // Not used
// Starting sections of the McASP
mcasp->regs->XGBLCTL |= GBLCTL_XHCLKRST_ON; // HS Clk
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XHCLKRST_ON ) != GBLCTL_XHCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RHCLKRST_ON; // HS Clk
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RHCLKRST_ON ) != GBLCTL_RHCLKRST_ON );
mcasp->regs->XGBLCTL |= GBLCTL_XCLKRST_ON; // Clk
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XCLKRST_ON ) != GBLCTL_XCLKRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RCLKRST_ON; // Clk
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RCLKRST_ON ) != GBLCTL_RCLKRST_ON );
mcasp->regs->XSTAT = 0x0000ffff; // Clear all
mcasp->regs->RSTAT = 0x0000ffff; // Clear all
mcasp->regs->XGBLCTL |= GBLCTL_XSRCLR_ON; // Serialize
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSRCLR_ON ) != GBLCTL_XSRCLR_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSRCLR_ON; // Serialize
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSRCLR_ON ) != GBLCTL_RSRCLR_ON );
// Write a 0, so that no underrun occurs after releasing the state machine
mcasp->regs->XBUF5 = 0;
mcasp->regs->RBUF0 = 0;
mcasp->regs->XGBLCTL |= GBLCTL_XSMRST_ON; // State Machine
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XSMRST_ON ) != GBLCTL_XSMRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RSMRST_ON; // State Machine
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RSMRST_ON ) != GBLCTL_RSMRST_ON );
mcasp->regs->XGBLCTL |= GBLCTL_XFRST_ON; // Frame Sync
while ( ( mcasp->regs->XGBLCTL & GBLCTL_XFRST_ON ) != GBLCTL_XFRST_ON );
mcasp->regs->RGBLCTL |= GBLCTL_RFRST_ON; // Frame Sync
while ( ( mcasp->regs->RGBLCTL & GBLCTL_RFRST_ON ) != GBLCTL_RFRST_ON );
}