My Code:
8836.main.c
//###########################################################################
//
// FILE: Example_2833xMCBSP_SPIX.c
//
// TITLE: DSP28133x Device McBSP using SPI mode
//
// ASSUMPTIONS:
//
// This program requires the DSP2833x header files.
// As supplied, this project is configured for "boot to SARAM"
// operation. The 2833x Boot Mode table is shown below.
// For information on configuring the boot mode of an eZdsp,
// please refer to the documentation included with the eZdsp,
//
// $Boot_Table:
//
// GPIO87 GPIO86 GPIO85 GPIO84
// XA15 XA14 XA13 XA12
// PU PU PU PU
// ==========================================
// 1 1 1 1 Jump to Flash
// 1 1 1 0 SCI-A boot
// 1 1 0 1 SPI-A boot
// 1 1 0 0 I2C-A boot
// 1 0 1 1 eCAN-A boot
// 1 0 1 0 McBSP-A boot
// 1 0 0 1 Jump to XINTF x16
// 1 0 0 0 Jump to XINTF x32
// 0 1 1 1 Jump to OTP
// 0 1 1 0 Parallel GPIO I/O boot
// 0 1 0 1 Parallel XINTF boot
// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
// 0 0 1 1 Branch to check boot mode
// 0 0 1 0 Boot to flash, bypass ADC cal
// 0 0 0 1 Boot to SARAM, bypass ADC cal
// 0 0 0 0 Boot to SCI-A, bypass ADC cal
// Boot_Table_End$
//
// DESCRIPTION:
//
// SPI master mode transfer of 32-bit word size with digital loopback enabled.
//
// McBSP Signals SPI equivalent
// -------------------------------------
// MCLKX SPICLK (master)
// MFSX SPISTE (master)
// MDX SPISIMO
// MCLKR SPICLK (slave - not used for this example)
// MFSR SPISTE (slave - not used for this example)
// MDR SPISOMI (not used for this example)
//
// This program will execute and transmit words until terminated by the user.
//
// By default for the McBSP examples, the McBSP sample rate generator (SRG) input
// clock frequency is LSPCLK (150E6/4 or 100E6/4) assuming SYSCLKOUT = 150 MHz or
// 100 MHz respectively. If while testing, the SRG input frequency
// is changed, the #define MCBSP_SRG_FREQ (CPU_SPD/4) in the Mcbsp.c file must
// also be updated accordingly. This define is used to determine the Mcbsp initialization
// delay after the SRG is enabled, which must be at least 2 SRG clock cycles.
//
// Watch Variables:
// sdata1
// sdata2
// rdata1
// rdata2
//
//
//###########################################################################
//
// Original Author: S.S.
//
// $TI Release: 2833x/2823x Header Files and Peripheral Examples V133 $
// $Release Date: June 8, 2012 $
//###########################################################################
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
#define _EN_SLAVE 0
interrupt void cpu_timer0_isr(void);
interrupt void cpu_timer1_isr(void);
interrupt void cpu_timer2_isr(void);
interrupt void mcbsp_spiTxIsr(void);
interrupt void mcbsp_spiRxIsr(void);
// Prototype statements for functions found within this file.
void init_mcbsp_spi(void);
void mcbsp_xmit(int32 data);
void error(void);
// Global data for this example
int32 sdata = 0; // Sent Data
int32 rdata = 0; // Recieved Data
void main(void)
{
// Uint16 i;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initalize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio(); // Skipped for this example
// For this example, only enable the GPIO for McBSP-A
InitMcbspaGpio();
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
DINT;
// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example. This is useful for debug purposes.
// The shell ISR routines are found in DSP281x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
InitPieVectTable();
// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.TINT0 = &cpu_timer0_isr;
PieVectTable.XINT13 = &cpu_timer1_isr;
PieVectTable.TINT2 = &cpu_timer2_isr;
PieVectTable.MRINTA = &mcbsp_spiRxIsr;
PieVectTable.MXINTA = &mcbsp_spiTxIsr;
EDIS; // This is needed to disable write to EALLOW protected registers
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
InitCpuTimers(); // For this example, only initialize the Cpu Timers
#if (CPU_FRQ_150MHZ)
// Configure CPU-Timer 0, 1, and 2 to interrupt every second:
// 150MHz CPU Freq, 1 second Period (in uSeconds)
ConfigCpuTimer(&CpuTimer0, 150, 1000000);
ConfigCpuTimer(&CpuTimer1, 150, 1000000);
ConfigCpuTimer(&CpuTimer2, 150, 1000000);
#endif
// Step 5. User specific code,
init_mcbsp_spi();
CpuTimer0Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
CpuTimer1Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
CpuTimer2Regs.TCR.all = 0x4001; // Use write-only instruction to set TSS bit = 0
// Enable interrupts required for this example
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER6.bit.INTx1=1; // Enable PIE Group 6, INT 1
PieCtrlRegs.PIEIER6.bit.INTx2=1; // Enable PIE Group 6, INT 2
PieCtrlRegs.PIEIER6.bit.INTx5=1; // Enable PIE Group 6, INT 5
PieCtrlRegs.PIEIER6.bit.INTx6=1; // Enable PIE Group 6, INT 6
// Enable TINT0 in the PIE: Group 1 interrupt 7
PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
IER=M_INT6|M_INT1|M_INT13|M_INT14; // Enable CPU INT6
EINT; // Enable Global interrupt INTM
ERTM; // Enable Global realtime interrupt DBGM
// Step 6. IDLE loop. Just sit and loop forever (optional):
for(;;);
}
// Some Useful local functions
void error(void)
{
asm(" ESTOP0"); // test failed!! Stop!
for (;;);
}
void init_mcbsp_spi()
{
// McBSP-A register settings
McbspaRegs.SPCR2.all=0x0000; // Reset FS generator, sample rate generator & transmitter
McbspaRegs.SPCR1.all=0x0000; // Reset Receiver, Right justify word, Digital loopback dis.
#if _EN_SLAVE
McbspaRegs.PCR.all=0x0008; //(CLKXM=CLKRM=FSXM=FSRM= 0, FSXP = 1)
McbspaRegs.SPCR1.bit.CLKSTP = 2; // Together with CLKXP/CLKRP determines clocking scheme
McbspaRegs.PCR.bit.CLKXP = 0; // CPOL = 0, CPHA = 0 rising edge no delay
McbspaRegs.PCR.bit.CLKRP = 0;
McbspaRegs.RCR2.bit.RDATDLY=00; // FSX setup time 1 in master mode. 0 for slave mode (Receive)
McbspaRegs.XCR2.bit.XDATDLY=00; // FSX setup time 1 in master mode. 0 for slave mode (Transmit)
McbspaRegs.RCR1.bit.RWDLEN1=5; // 32-bit word
McbspaRegs.XCR1.bit.XWDLEN1=5; // 32-bit word
#else
McbspaRegs.PCR.all=0x0F08; //(CLKXM=CLKRM=FSXM=FSRM= 1, FSXP = 1)
McbspaRegs.SPCR1.bit.DLB = 0; // LoopBack Mode Enable/Disable
McbspaRegs.SPCR1.bit.CLKSTP = 2; // Together with CLKXP/CLKRP determines clocking scheme
McbspaRegs.PCR.bit.CLKXP = 0; // CPOL = 0, CPHA = 0 rising edge no delay
McbspaRegs.PCR.bit.CLKRP = 0;
McbspaRegs.RCR2.bit.RDATDLY=01; // FSX setup time 1 in master mode. (Receive)
McbspaRegs.XCR2.bit.XDATDLY=01; // FSX setup time 1 in master mode. (Transmit)
McbspaRegs.RCR1.bit.RWDLEN1=5; // 32-bit word
McbspaRegs.XCR1.bit.XWDLEN1=5; // 32-bit word
#endif
//McbspaRegs.MFFINT.bit.XINT = 1; // Enable Transmit Interrupts
//McbspaRegs.MFFINT.bit.RINT = 1; // Enable Receive Interrupts
McbspaRegs.SRGR2.all=0x2000; // CLKSM=1, FPER = 1 CLKG periods
McbspaRegs.SRGR1.all= 0x000F; // Frame Width = 1 CLKG period, CLKGDV=1~255
McbspaRegs.SPCR2.bit.GRST=1; // Enable the sample rate generator
delay_loop(); // Wait at least 2 SRG clock cycles
McbspaRegs.SPCR2.bit.XRST=1; // Release TX from Reset
McbspaRegs.SPCR1.bit.RRST=1; // Release RX from Reset
McbspaRegs.SPCR1.bit.RINTM = 1; // Release RX from Reset
McbspaRegs.SPCR2.bit.FRST=1; // Frame Sync Generator reset
}
void mcbsp_xmit(int32 data)
{
McbspaRegs.DXR2.all=data>>16;
McbspaRegs.DXR1.all=data;
}
interrupt void mcbsp_spiTxIsr(void)
{
// To receive more interrupts from this PIE group, acknowledge this interrupt
PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;
}
interrupt void mcbsp_spiRxIsr(void)
{
#if _EN_SLAVE
long rdata = 0;
rdata=McbspaRegs.DRR2.all;
rdata<<=16;
rdata|=McbspaRegs.DRR1.all;
// To receive more interrupts from this PIE group, acknowledge this interrupt
PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;
#else
long rdata = 0;
rdata=McbspaRegs.DRR1.all;
rdata<<=16;
rdata|=McbspaRegs.DRR2.all;
// To receive more interrupts from this PIE group, acknowledge this interrupt
PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;
#endif
}
interrupt void cpu_timer0_isr(void)
{
CpuTimer0.InterruptCount++;
#if _EN_SLAVE
mcbsp_xmit(0x88888888);
#else
sdata = (sdata + 1)%360;
mcbsp_xmit(sdata);
#endif
// Acknowledge this interrupt to receive more interrupts from group 1
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}
interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
// The CPU acknowledges the interrupt.
EDIS;
}
interrupt void cpu_timer2_isr(void)
{ EALLOW;
CpuTimer2.InterruptCount++;
// The CPU acknowledges the interrupt.
EDIS;
}
//===========================================================================
// No more.
//===========================================================================
I tried to use McBsp's interrupt in SPI Mode, then communicate between both.
But I can send a 32bits data out from Master, but I can not receive any data from Slave.
Who can help me to solve it?
Thank you first.
