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CCS-COMM_BOARD/F28335/DSP2833x_ECan.c

465 lines
16 KiB
C

//###########################################################################
//
// FILE: DSP2833x_ECan.c
//
// TITLE: DSP2833x Enhanced CAN Initialization & Support Functions.
//
//###########################################################################
// $TI Release: F2833x/F2823x Header Files and Peripheral Examples V142 $
// $Release Date: November 1, 2016 $
// $Copyright: Copyright (C) 2007-2016 Texas Instruments Incorporated -
// http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################
//
// Included Files
//
#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File
#include "DSP2833x_Examples.h" // DSP2833x Examples Include File
//
// InitECan - This function initializes the eCAN module to a known state.
//
void
InitECan(void)
{
InitECana();
#if DSP28_ECANB
InitECanb();
#endif // if DSP28_ECANB
}
//
// InitECana - Initialize eCAN-A module
//
void
InitECana(void)
{
//
// Create a shadow register structure for the CAN control registers. This
// is needed, since only 32-bit access is allowed to these registers.
// 16-bit access to these registers could potentially corrupt the register
// contents or return false data. This is especially true while writing
// to/reading from a bit (or group of bits) among bits 16 - 31
//
struct ECAN_REGS ECanaShadow;
EALLOW; // EALLOW enables access to protected bits
//
// Configure eCAN RX and TX pins for CAN operation using eCAN regs
//
ECanaShadow.CANTIOC.all = ECanaRegs.CANTIOC.all;
ECanaShadow.CANTIOC.bit.TXFUNC = 1;
ECanaRegs.CANTIOC.all = ECanaShadow.CANTIOC.all;
ECanaShadow.CANRIOC.all = ECanaRegs.CANRIOC.all;
ECanaShadow.CANRIOC.bit.RXFUNC = 1;
ECanaRegs.CANRIOC.all = ECanaShadow.CANRIOC.all;
//
// Configure eCAN for HECC mode - (reqd to access mailboxes 16 thru 31)
// HECC mode also enables time-stamping feature
//
ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
ECanaShadow.CANMC.bit.SCB = 1;
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
//
// Initialize all bits of 'Master Control Field' to zero
// Some bits of MSGCTRL register come up in an unknown state. For proper
// operation, all bits (including reserved bits) of MSGCTRL must be
// initialized to zero
//
ECanaMboxes.MBOX0.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX1.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX2.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX3.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX4.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX5.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX6.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX7.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX8.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX9.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX10.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX11.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX12.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX13.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX14.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX15.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX16.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX17.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX18.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX19.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX20.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX21.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX22.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX23.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX24.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX25.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX26.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX27.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX28.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX29.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX30.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX31.MSGCTRL.all = 0x00000000;
//
// TAn, RMPn, GIFn bits are all zero upon reset and are cleared again
// as a matter of precaution.
//
ECanaRegs.CANTA.all = 0xFFFFFFFF; // Clear all TAn bits
ECanaRegs.CANRMP.all = 0xFFFFFFFF; // Clear all RMPn bits
ECanaRegs.CANGIF0.all = 0xFFFFFFFF; // Clear all interrupt flag bits
ECanaRegs.CANGIF1.all = 0xFFFFFFFF;
//
// Configure bit timing parameters for eCANA
//
ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
ECanaShadow.CANMC.bit.CCR = 1 ; // Set CCR = 1
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
do
{
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
} while(ECanaShadow.CANES.bit.CCE != 1 ); // Wait for CCE bit to be set
ECanaShadow.CANBTC.all = 0;
//
// CPU_FRQ_150MHz is defined in DSP2833x_Examples.h
//
#if (CPU_FRQ_150MHZ)
//
// The following block for all 150 MHz SYSCLKOUT
// (75 MHz CAN clock) - default. Bit rate = 1 Mbps See Note at End of File
//
ECanaShadow.CANBTC.bit.BRPREG = 4;
ECanaShadow.CANBTC.bit.TSEG2REG = 2;
ECanaShadow.CANBTC.bit.TSEG1REG = 10;
#endif
//
// CPU_FRQ_100MHz is defined in DSP2833x_Examples.h
//
#if (CPU_FRQ_100MHZ)
//
// The following block is only for 100 MHz SYSCLKOUT (50 MHz CAN clock).
// Bit rate = 1 Mbps See Note at End of File
//
ECanaShadow.CANBTC.bit.BRPREG = 4;
ECanaShadow.CANBTC.bit.TSEG2REG = 1;
ECanaShadow.CANBTC.bit.TSEG1REG = 6;
#endif
ECanaShadow.CANBTC.bit.SAM = 1;
ECanaRegs.CANBTC.all = ECanaShadow.CANBTC.all;
ECanaShadow.CANMC.all = ECanaRegs.CANMC.all;
ECanaShadow.CANMC.bit.CCR = 0 ; // Set CCR = 0
ECanaRegs.CANMC.all = ECanaShadow.CANMC.all;
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
do
{
ECanaShadow.CANES.all = ECanaRegs.CANES.all;
} while(ECanaShadow.CANES.bit.CCE != 0 );// Wait for CCE bit to be cleared
//
// Disable all Mailboxes
//
ECanaRegs.CANME.all = 0; // Required before writing the MSGIDs
EDIS;
}
#if (DSP28_ECANB)
//
// Initialize eCAN-B module
//
void
InitECanb(void)
{
//
// Create a shadow register structure for the CAN control registers. This
// is needed, since only 32-bit access is allowed to these registers.
// 16-bit access to these registers could potentially corrupt the register
// contents or return false data. This is especially true while writing
// to/reading from a bit (or group of bits) among bits 16 - 31
//
struct ECAN_REGS ECanbShadow;
EALLOW; // EALLOW enables access to protected bits
//
// Configure eCAN RX and TX pins for CAN operation using eCAN regs
//
ECanbShadow.CANTIOC.all = ECanbRegs.CANTIOC.all;
ECanbShadow.CANTIOC.bit.TXFUNC = 1;
ECanbRegs.CANTIOC.all = ECanbShadow.CANTIOC.all;
ECanbShadow.CANRIOC.all = ECanbRegs.CANRIOC.all;
ECanbShadow.CANRIOC.bit.RXFUNC = 1;
ECanbRegs.CANRIOC.all = ECanbShadow.CANRIOC.all;
//
// Configure eCAN for HECC mode - (read to access mailboxes 16 thru 31)
//
ECanbShadow.CANMC.all = ECanbRegs.CANMC.all;
ECanbShadow.CANMC.bit.SCB = 1;
ECanbRegs.CANMC.all = ECanbShadow.CANMC.all;
//
// Initialize all bits of 'Master Control Field' to zero
// Some bits of MSGCTRL register come up in an unknown state. For proper
// operation, all bits (including reserved bits) of MSGCTRL must be
// initialized to zero
//
ECanbMboxes.MBOX0.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX1.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX2.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX3.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX4.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX5.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX6.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX7.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX8.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX9.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX10.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX11.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX12.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX13.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX14.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX15.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX16.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX17.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX18.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX19.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX20.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX21.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX22.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX23.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX24.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX25.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX26.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX27.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX28.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX29.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX30.MSGCTRL.all = 0x00000000;
ECanbMboxes.MBOX31.MSGCTRL.all = 0x00000000;
//
// TAn, RMPn, GIFn bits are all zero upon reset and are cleared again
// as a matter of precaution.
//
ECanbRegs.CANTA.all = 0xFFFFFFFF; // Clear all TAn bits
ECanbRegs.CANRMP.all = 0xFFFFFFFF; // Clear all RMPn bits
ECanbRegs.CANGIF0.all = 0xFFFFFFFF; // Clear all interrupt flag bits
ECanbRegs.CANGIF1.all = 0xFFFFFFFF;
//
// Configure bit timing parameters for eCANB
//
ECanbShadow.CANMC.all = ECanbRegs.CANMC.all;
ECanbShadow.CANMC.bit.CCR = 1 ; // Set CCR = 1
ECanbRegs.CANMC.all = ECanbShadow.CANMC.all;
ECanbShadow.CANES.all = ECanbRegs.CANES.all;
do
{
ECanbShadow.CANES.all = ECanbRegs.CANES.all;
} while(ECanbShadow.CANES.bit.CCE != 1); // Wait for CCE bit to be cleared
ECanbShadow.CANBTC.all = 0;
//
// CPU_FRQ_150MHz is defined in DSP2833x_Examples.h
//
#if (CPU_FRQ_150MHZ)
//
// The following block for all 150 MHz SYSCLKOUT
// (75 MHz CAN clock) - default. Bit rate = 1 Mbps See Note at end of file
//
ECanbShadow.CANBTC.bit.BRPREG = 4;
ECanbShadow.CANBTC.bit.TSEG2REG = 2;
ECanbShadow.CANBTC.bit.TSEG1REG = 10;
#endif
//
// CPU_FRQ_100MHz is defined in DSP2833x_Examples.h
//
#if (CPU_FRQ_100MHZ)
//
// The following block is only for 100 MHz SYSCLKOUT (50 MHz CAN clock).
// Bit rate = 1 Mbps See Note at end of file
//
ECanbShadow.CANBTC.bit.BRPREG = 4;
ECanbShadow.CANBTC.bit.TSEG2REG = 1;
ECanbShadow.CANBTC.bit.TSEG1REG = 6;
#endif
ECanbShadow.CANBTC.bit.SAM = 1;
ECanbRegs.CANBTC.all = ECanbShadow.CANBTC.all;
ECanbShadow.CANMC.all = ECanbRegs.CANMC.all;
ECanbShadow.CANMC.bit.CCR = 0 ; // Set CCR = 0
ECanbRegs.CANMC.all = ECanbShadow.CANMC.all;
ECanbShadow.CANES.all = ECanbRegs.CANES.all;
do
{
ECanbShadow.CANES.all = ECanbRegs.CANES.all;
} while(ECanbShadow.CANES.bit.CCE != 0 );// Wait for CCE bit to be cleared
//
// Disable all Mailboxes
//
ECanbRegs.CANME.all = 0; // Required before writing the MSGIDs
EDIS;
}
#endif // if DSP28_ECANB
//
// InitECanGpio - This function initializes GPIO pins to function as eCAN pins
//
// Each GPIO pin can be configured as a GPIO pin or up to 3 different
// peripheral functional pins. By default all pins come up as GPIO
// inputs after reset.
//
// Caution:
// Only one GPIO pin should be enabled for CANTXA/B operation.
// Only one GPIO pin shoudl be enabled for CANRXA/B operation.
// Comment out other unwanted lines.
//
void
InitECanGpio(void)
{
InitECanaGpio();
#if (DSP28_ECANB)
InitECanbGpio();
#endif // if DSP28_ECANB
}
//
// InitECanaGpio - This function initializes GPIO pins to function as eCAN- A
//
void
InitECanaGpio(void)
{
EALLOW;
//
// Enable internal pull-up for the selected CAN pins
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
//
// GpioCtrlRegs.GPAPUD.bit.GPIO30 = 0; // Enable pull-up for GPIO30 (CANRXA)
GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; // Enable pull-up for GPIO18 (CANRXA)
// GpioCtrlRegs.GPAPUD.bit.GPIO31 = 0; //Enable pull-up for GPIO31 (CANTXA)
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; //Enable pull-up for GPIO19 (CANTXA)
//
// Set qualification for selected CAN pins to asynch only
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
//
// GpioCtrlRegs.GPAQSEL2.bit.GPIO30 = 3; // Asynch qual for GPIO30 (CANRXA)
GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch qual for GPIO18 (CANRXA)
//
// Configure eCAN-A pins using GPIO regs
// This specifies which of the possible GPIO pins will be eCAN functional
// pins.
//
// GpioCtrlRegs.GPAMUX2.bit.GPIO30 = 1; // Configure GPIO30 for CANRXA
GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 3; // Configure GPIO18 for CANRXA
// GpioCtrlRegs.GPAMUX2.bit.GPIO31 = 1; // Configure GPIO31 for CANTXA
GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 3; // Configure GPIO19 for CANTXA
EDIS;
}
#if (DSP28_ECANB)
//
// InitECanbGpio - This function initializes GPIO pins to function as eCAN-B
//
void
InitECanbGpio(void)
{
EALLOW;
//
// Enable internal pull-up for the selected CAN pins
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.
//
// GpioCtrlRegs.GPAPUD.bit.GPIO8 = 0; //Enable pull-up for GPIO8 (CANTXB)
//GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0; //Enable pull-up for GPIO12(CANTXB)
//GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0; //Enable pull-up for GPIO16(CANTXB)
GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0; //Enable pull-up for GPIO20(CANTXB)
// GpioCtrlRegs.GPAPUD.bit.GPIO10 = 0; // Enable pull-up for GPIO10(CANRXB)
//GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0; // Enable pull-up for GPIO13(CANRXB)
//GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0; // Enable pull-up for GPIO17(CANRXB)
GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0; // Enable pull-up for GPIO21(CANRXB)
//
// Set qualification for selected CAN pins to asynch only
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.
//
// GpioCtrlRegs.GPAQSEL1.bit.GPIO10 = 3; // Asynch qual for GPIO10 (CANRXB)
//GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3; // Asynch qual for GPIO13 (CANRXB)
//GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // Asynch qual for GPIO17 (CANRXB)
GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 3; // Asynch qual for GPIO21 (CANRXB)
//
// Configure eCAN-B pins using GPIO regs
// This specifies which of the possible GPIO pins will be eCAN functional
// pins.
//
// GpioCtrlRegs.GPAMUX1.bit.GPIO8 = 2; // Configure GPIO8 for CANTXB
//GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 2; // Configure GPIO12 for CANTXB
//GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 2; // Configure GPIO16 for CANTXB
GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 3; // Configure GPIO20 for CANTXB
// GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 2; // Configure GPIO10 for CANRXB
//GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 2; // Configure GPIO13 for CANRXB
//GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 2; // Configure GPIO17 for CANRXB
GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 3; // Configure GPIO21 for CANRXB
EDIS;
}
#endif // if DSP28_ECANB
//
// Note: Bit timing parameters must be chosen based on the network parameters
// such as the sampling point desired and the propagation delay of the network.
// The propagation delay is a function of length of the cable, delay introduced
// by the transceivers and opto/galvanic-isolators (if any).
//
// The parameters used in this file must be changed taking into account the
// above mentioned factors in order to arrive at the bit-timing parameters
// suitable for a network.
//
//
// End of File
//