TI中文支持网我接手公司项目，有段代码不明白
dma0和dma1为什么这样配置中断，interrupt_init里enable DMA0 interrupt为什么是这样写。如果要增加dma2中断又如何添加呢。
/*****************************************************************************/
/* Define Interrupt Flag and Interrupt Mask Registers */
/*****************************************************************************/
#define IER0_ADDR 0x0000#define IER0 *(volatile unsigned int*)IER0_ADDR
#define IFR0_ADDR 0x0001
#define IFR0 *(volatile unsigned int*)IFR0_ADDR
#define IER1_ADDR 0x0045
#define IER1 *(volatile unsigned int*)IER1_ADDR
#define IFR1_ADDR 0x0046
#define IFR1 *(volatile unsigned int*)IFR1_ADDR
#define IVPD_ADDR 0x0049
#define IVPD *(volatile unsigned int*)IVPD_ADDR
#define IVPH_ADDR 0x004a
#define IVPH *(volatile unsigned int*)IVPH_ADDR
/*****************************************************************************/
/* Symbolic Constants */
/*****************************************************************************/
#define IER0_USBMSK 0x0100 // mask for USB intrpt
#define IFR0_USBMSK 0x0100 // mask for USB intrpt
#define IER1_DMA0MSK 0x0004 // mask for DMA0 intrpt
#define IFR1_DMA0MSK 0x0004 // mask for DMA0 intrpt
#define IER0_DMA1MSK 0x0200 // mask for DMA1 intrpt
#define IFR0_DMA1MSK 0x0200 // mask for DMA1 intrpt
/*****************************************************************************/
/* INTR_ENABLE – enables all masked interrupts by resetting INTM */
/* bit in Status Register 1 */
/*****************************************************************************/
#define INTR_GLOBAL_ENABLE \
asm(" bit(st1, #st1_intm) = #0");
/*****************************************************************************/
/* INTR_DISABLE – disables all masked interrupts by setting INTM */
/* bit in Status Register 1 */
/*****************************************************************************/
#define INTR_GLOBAL_DISABLE \
asm(" bit(st1, #st1_intm) = #1");
//中断初始化，打开USB和DMA中断
void
interrupt_init()
{
IVPD = ((Uint32)RESET_VEC>>8) & 0xFFFF; // init IVPD reg
IVPH = ((Uint32)RESET_VEC>>8) & 0xFFFF; // init IVPH reg
// enable USB interrupt
IFR0 |= IFR0_USBMSK; // Clear USB intrpt flag
IER0 |= IER0_USBMSK; // Enable USB intrpt mask
// enable DMA0 interrupt
IFR1 |= IFR1_DMA0MSK;
IER1 |= IER1_DMA0MSK;
// enable DMA1 interrupt
IFR0 |= IFR0_DMA1MSK;
IER0 |= IER0_DMA1MSK;
INTR_GLOBAL_ENABLE; // enable global interrupt
}
chunying wu：
vectors.asm如下：
;************************************************************************** ; .C54CM_off; .CPL_off; .ARMS_off .mmregs .ref _c_int00, _USB_ISR, _DMA_0_ISR, _DMA_1_ISR, _McBSP_2_ISR .def _RESET_VEC, no_isr
;**********************************************************************************; predefined stack operation modes ;**********************************************************************************; USE_RETA : 2×16-bit fast return mode (RETA used); NO_RETA : 2×16-bit slow return mode (RETA not used); C54X_STK : 32-bit slow return mode – default if no stack mode specified
; .vli_off
;********************************************************************************** .sect "Rst_Vec" .align 256 ;**********************************************************************************
_RESET_VEC: .ivec _c_int00 ; Reset / Software Interrupt #0 – 32bit slow ret
NMI: .ivec no_isr ; Nonmaskable / Software Interrupt #1
INT0: .ivec no_isr ; Ext. User Interrupt #0 / Software Interrupt #2 INT2: .ivec no_isr ; Ext. User Interrupt #2 / Software Interrupt #3
TINT0: .ivec no_isr ; Timer #0 / Software Interrupt #4
RINT0: .ivec no_isr ; McBSP #0 Rec / Software Interrupt #5
RINT1: .ivec no_isr ; McBSP #1 Rcv / Software Interrupt #6
XINT1: .ivec no_isr ; McBSP #1 Xmit / Software Interrupt #7
USB: .ivec _USB_ISR ; USB / Software Interrupt #8
DMAC1: .ivec _DMA_1_ISR ; DMA Channel #1 / Software Interrupt #9
DSPINT: .ivec no_isr ; Host Interrupt / Software Interrupt #10
INT3: .ivec no_isr ; Ext. User Interrupt #3 / Software Interrupt #11
RINT2: .ivec _McBSP_2_ISR ; McBSP #2 Rcv / Software Interrupt #12
XINT2: .ivec no_isr ; McBSP #2 Xmit / Software Interrupt #13
DMAC4: .ivec no_isr ; DMA Channel #4 / Software Interrupt #14
DMAC5: .ivec no_isr ; DMA Channel #5 / Software Interrupt #15
INT1: .ivec no_isr ; Ext. User Interrupt #1 / Software Interrupt #16
XINT0: .ivec no_isr ; McBSP #0 Xmit / Software Interrupt #17
DMAC0: .ivec _DMA_0_ISR ; DMA Channel #0 / Software Interrupt #18
INT4: .ivec no_isr ; Ext. User Interrupt #4 / Software Interrupt #19
DMAC2: .ivec no_isr ; DMA Channel #2 / Software Interrupt #20
DMAC3: .ivec no_isr ; DMA Channel #3 / Software Interrupt #21
TINT1: .ivec no_isr ; Timer #1 / Software Interrupt #22
I2C: .ivec no_isr ; I2C Interrupt / Software Interrupt #23
BERR: .ivec no_isr ; Bus Error / Software Interrupt #24
DLOG: .ivec no_isr ; Emulation / Software Interrupt #25
RTOS: .ivec no_isr ; Emulation / Software Interrupt #26
SINT27: .ivec no_isr ; Software Interrupt #27
SINT28: .ivec no_isr ; Software Interrupt #28
SINT29: .ivec no_isr ; Software Interrupt #29
SINT30: .ivec no_isr ; Software Interrupt #30
;SINT31: .ivec no_isr ; Software Interrupt #31
; .vli_on
.sect ".text"
********************************************************************************** Name : no_isr **** **** Purpose : Spurious interrupt handler **** **** Author : **** **********************************************************************************no_isr: return_int
Tony Tang：
用或的关系将相应的位置1，而其它位的值不变，有什么不对的吗？
