GNU ARM汇编--(九)s3c2440的PWM_s3c2440 的 pwm 模块的自动加载模式和双缓冲模式的主要作用。

MUX1                  [7:4]                               为PWM Timer1选择复用输入

                                                                    0000=1/2 0001=1/4 0010=1/8

                                                                    0011=1/16  01xx=External TCLK1

/*
copyleft@  dndxhej@gmail.com
*/
 
.equ   NOINT, 0xc0
 
.equ 	GPBCON,	0x56000010  	@led
.equ	GPBDAT,	0x56000014  	@led
.equ   GPBUP,        0x56000018    @led
.equ 	GPFCON, 0x56000050  	@interrupt config
.equ	EINTMASK, 0x560000a4
.equ 	EXTINT0,  0x56000088
.equ 	EXTINT1,  0x5600008c
.equ 	EXTINT2,  0x56000090
.equ	INTMSK,	 0x4A000008
.equ   EINTPEND,     0x560000a8
 
.equ	SUBSRCPND,  0x4a000018 
.equ	INTSUBMSK,  0x4a00001c
 
 
 
.equ   SRCPND,   0X4A000000
.equ   INTPND,   0X4A000010
 
 
.equ	GPHCON,	0x56000070
.equ	GPHDAT,	0x56000074
 
.equ GPB5_out,  (1<<(5*2))  
.equ GPB6_out,  (1<<(6*2))  
.equ GPB7_out,  (1<<(7*2))  
.equ GPB8_out,  (1<<(8*2))  
      
.equ GPBVALUE,    (GPB5_out | GPB6_out | GPB7_out | GPB8_out)  
 
.equ	LOCKTIME, 0x4c000000
.equ	MPLLCON, 0x4c000004
.equ	UPLLCON, 0x4c000008
.equ	M_MDIV, 92
.equ   M_PDIV, 1
.equ	M_SDIV, 1
.equ	U_MDIV, 56
.equ   U_PDIV, 2
.equ	U_SDIV, 2
 
.equ	CLKDIVN, 0x4c000014
.equ	DIVN_UPLL, 0
.equ	HDIVN,	1
.equ	PDIVN,	1    @FCLK : HCLK : PCLK = 1:2:4
 
 
.equ    WTCON,  0x53000000
.equ    Pre_scaler,  249
.equ    wd_timer,   1
.equ    clock_select,   00   @316
.equ    int_gen,    1     @开中断
.equ    reset_enable,   0  @关掉重启信号
 
.equ    WTDAT,0x53000004
.equ    Count_reload,50000    @定时器定为2S PCLK = 100M   PCLK/(Pre_scaler+1)/clock_select = 100M/(249+1)/16=25k   50000/25k=2s
 
.equ    WTCNT,0x53000008
.equ    Count,50000
 
 
.equ	TCFG0,0x51000000
.equ	Prescaler1,0x00   @[15:8]Timer234
.equ	Prescaler0,249   @[7:0]Timer01
 
.equ	TCFG1,0x51000004
.equ	DMA_MODE,0x0        @[23:20]no dma channal
.equ	MUX0,0x2            @[3:0]   1/8
@定时器输入时钟周期 = PCLK/(prescaler + 1)/(divider value)
@clk = 100M/(249+1)/8=25k
 
.equ	TCON,0x51000008
.equ	DZ_eable,0    @[4]关闭死区的操作
.equ	auto_reload,1    @[3]auto_reload
.equ	inverter,1	@[2]打开电平反转
.equ	man_update,1   @[1]手动更新
.equ   clear_man_update,0
.equ	start,1	@[0]开始
.equ	stop,0		@[0]停止
 
.equ	TCNTB0,0x5100000c       
.equ	TCMPB0,0x51000010
 
.equ	TCNTO0,0x51000014
 
 
.equ    ULCON0, 0x50000000
.equ    IR_MODE,    0x0   @[6]正常模式
.equ    Parity_Mode,    0x0 @[5:3]无校验位
.equ    Num_of_stop_bit,  0x0  @[2]一个停止位
.equ    Word_length,    0b11    @[1:0]8个数据位
 
.equ    UCON0,  0x50000004
.equ    FCLK_Div,   0   @[15:12]  时钟源选择用PCLK,所以这里用默认值
.equ    Clk_select, 0b00    @[11:10] 时钟源选择使用PCLK
.equ    Tx_Int_Type, 1  @[9]  中断请求类型为Level
.equ    Rx_Int_Type, 0 @1  @[8]  中断请求类型为Level
.equ    Rx_Timeout, 0  @[7]
.equ    Rx_Error_Stat_Int, 1 @[6]
.equ    Loopback_Mode, 0 @[5]  正常模式
.equ    Break_Sig,  0 @[4] 不发送终止信号
.equ    Tx_Mode,    0b01 @[3:2]  中断请求或轮循模式
.equ    Rx_Mode,    0b01 @[1:0]  中断请求或轮循模式
 
.equ    UFCON0, 0x50000008
.equ    Tx_FIFO_Trig_Level, 0b00 @[7:6]
.equ    Rx_FIFO_Trig_Level, 0b00 @[5:4]
.equ    Tx_FIFO_Reset,  0b0 @[2]
.equ    Rx_FIFO_Reset,  0b0 @[1]
.equ    FIFO_Enable,    0b0 @[0] 非FIFO模式
 
.equ    UMCON0, 0x5000000C    @这个寄存器可以不管的
.equ    UTRSTAT0,   0x50000010
.equ    UERSTAT0,   0x50000014
.equ    UFSTAT0,    0x50000018
.equ    UMSTAT0,    0x5000001C
.equ    UTXH0,      0x50000020   @(L 小端)
.equ    URXH0,      0x50000024   @(L 小端)
 
.equ	 UBRDIV0,    0x50000028
.equ	 UBRDIV,	0x35   @PCLK=400M/4=100M   UBRDIV = (int)(100M/115200/16) - 1 = 53 = 0x35
 
.global Buzzer_Freq_Set
 
.global _start
_start:		b	reset
		ldr     pc, _undefined_instruction
		ldr 	pc, _software_interrupt
		ldr	pc, _prefetch_abort
		ldr	pc, _data_abort
		ldr	pc, _not_used
		@b	irq
		ldr 	pc, _irq
		ldr 	pc, _fiq
 
 
 
_undefined_instruction:		.word undefined_instruction
_software_interrupt:		.word software_interrupt
_prefetch_abort:		.word prefetch_abort
_data_abort:			.word data_abort
_not_used:			.word not_used
_irq:				.word irq
_fiq:				.word fiq
 
.balignl 16,0xdeadbeef
 
reset:
 
 
	ldr     r3, =WTCON
	mov	r4, #0x0                     
	str	r4, [r3]	@ disable watchdog    
 
	ldr	r0, =GPBCON
	ldr	r1, =0x15400     @这个时候暂不配置GPB0为TOUT0，这时候只是配置GPB0为TOUT0
	str	r1, [r0]
 
	ldr	r2, =GPBDAT
	ldr	r1, =0x160
	str	r1, [r2]
 
	bl clock_setup
	bl uart_init
	//bl delay
 
 
    msr cpsr_c, #0xd2 @进入中断模式
    ldr sp, =3072 @中断模式的栈指针定义
 
    msr cpsr_c, #0xd3 @进入系统模式
    ldr sp, =4096 @设置系统模式的栈指针
 
@--------------------------------------------
 
	ldr	r0, =GPBUP
	ldr	r1, =0x03f0  
	str	r1, [r0]      
   
	ldr	r0, =GPFCON
	ldr	r1, =0x2ea@0x2    
	str	r1, [r0]  
 
	ldr	r0, =EXTINT0
	@ldr	r1, =0x8f888@0x0@0x8f888      @~(7|(7<<4)|(7<<8)|(7<<16))   //低电平触发中断
	ldr	r1, =0xafaaa@0x0@0x8f888      //下降沿触发中断
	str	r1, [r0]  
 
	ldr	r0, =EINTPEND
	ldr	r1, =0xf0@0b10000
	str	r1, [r0]  
 
	ldr	r0, =EINTMASK
	ldr	r1, =0x00@0b00000
	str	r1, [r0]  
 
 
 
	ldr	r0, =SRCPND
	ldr	r1, =0x3ff@0x1@0b11111
	str	r1, [r0]  
 
	ldr	r0, =SUBSRCPND
	ldr	r1, =0x1<<13
	str	r1, [r0]  
 
	ldr	r0, =INTPND
	ldr	r1, =0x3ff@0x1@0b11111
	str	r1, [r0]  
 
	ldr	r0, =INTSUBMSK
	ldr	r1, =0x0<<13
	str	r1, [r0]  
 
	ldr	r0, =INTMSK
	ldr	r1, =0xfffff000@0b00000
	str	r1, [r0]  
 
	MRS r1, cpsr
	BIC r1, r1, #0x80
	MSR cpsr_c, r1
 
 
	bl     main
 
irq:
	sub 	lr,lr,#4
	stmfd	sp!,{r0-r12,lr}
 
 
	bl irq_isr
	ldmfd  sp!,{r0-r12,pc}^ 
 
 
irq_isr:
 
	ldr	r2, =GPBDAT
	ldr	r1, =0x0e0
	str	r1, [r2]
 
 
         ldr r0,=EINTPEND
         ldr r1,=0xf0
         str r1,[r0] 
 
	ldr	r0, =SRCPND
	ldr	r1, =0x3ff@0b11111
	str	r1, [r0]  
 
	ldr	r0, =SUBSRCPND
	ldr	r1, =0x3ff@0x1<<13
	str	r1, [r0]  
 
	ldr	r0, =INTPND
	ldr	r1, =0x3ff@0b11111
	str	r1, [r0]  
 
	mov pc,lr
 
 
delay:
	
	ldr r3,=0xffffff
 
delay1:
	sub r3,r3,#1
 
	cmp r3,#0x0
 
	bne delay1
 
	mov pc,lr
 
 
clock_setup:
 
	ldr r0,=LOCKTIME
	ldr r1,=0xffffffff
	str r1, [r0]
 
	ldr r0,=CLKDIVN
	ldr r1,=(DIVN_UPLL<<3) | (HDIVN<<1) | (PDIVN<<0)
	str r1, [r0]
 
	ldr r0,=UPLLCON
	ldr r1,=(U_MDIV<<12) | (U_PDIV<<4) | (U_SDIV<<0)   @Fin=12M  UPLL=48M
	str r1, [r0]
	nop
	nop
	nop
	nop
	nop
	nop
	nop
	ldr r0,=MPLLCON
	ldr r1,=(M_MDIV<<12) | (M_PDIV<<4) | (M_SDIV<<0)    @Fin=12M  FCLK=400M
	str r1, [r0]
 
 
 
	mov pc,lr
 
 
uart_init:
	ldr r0,=GPHCON
	ldr r1,=0x2aaaa     @配置GPIO复用规则为串口
	str r1, [r0]
 
	ldr r0,=ULCON0
	ldr r1,=(IR_MODE<<6) | (Parity_Mode<<3) | (Num_of_stop_bit<<2) | (Word_length<<0)    @
	str r1, [r0]
 
	ldr r0,=UCON0
	ldr r1,=(FCLK_Div<<12) | (Clk_select<<10) | (Tx_Int_Type<<9) | (Rx_Int_Type<<8) | (Rx_Timeout<<7) | (Rx_Error_Stat_Int<<6) |(Loopback_Mode<<5) | (Break_Sig<<4) | (Tx_Mode<<2) | (Rx_Mode<<0)
	str r1, [r0]
 
	ldr r0,=UFCON0
	ldr r1,=(Tx_FIFO_Trig_Level<<6) | (Rx_FIFO_Trig_Level<<4) | (Tx_FIFO_Reset<<2) | (Rx_FIFO_Reset<<1) | (FIFO_Enable<<0)    @
	str r1, [r0]
 
	ldr r0,=UBRDIV0
	ldr r1,=(UBRDIV<<0)
	str r1, [r0]
 
    	mov pc,lr
 
Buzzer_Freq_Set:
 
	//ldr	r0, =GPBCON
	//ldr	r1, =0x15400     @这个时候暂不配置GPB0为TOUT0，这时候只是配置GPB0为TOUT0
	//str	r1, [r0]
 
	ldr	r2, =GPBDAT
	ldr	r1, =0x1c1
	str	r1, [r2]
 
	ldr	r2, =GPBCON
	ldr	r1,[r2]
	ldr	r1,[r1]
	//ldr	r1, =0x15400
	bic	r1,r1,#0x3
	orr	r1,r1,#0x2
	str	r1,[r2]
 
	ldr	r2, =GPBDAT
	ldr	r1, =0x1a0
	str	r1, [r2]
 
	ldr r1,=TCFG0
	ldr r2,=(Prescaler0<<0)
	str r2, [r1]
 
	ldr r1,=TCFG1
	ldr r2,=(DMA_MODE<<20) | (MUX0<<0)
	str r2, [r1]
 
//	ldr	r3,[r0]
//	str	r3,[r2]
 
 
 
	//mov  r2, r0
 
	ldr r1,=TCNTB0
	//ldr r2,=200
	str r0, [r1]
	
	mov  r0,r0,LSR #2
 
	ldr r1,=TCMPB0
	//ldr r2,=50
	str r0, [r1]
 
 
 
	ldr r1,=TCON
	ldr r2,=(DZ_eable<<4) | (auto_reload<<3) | (inverter<<2) | (man_update<<1) | (start<<0)
	str r2, [r1]
 
	ldr r1,=TCON
	ldr r2,=(DZ_eable<<4) | (auto_reload<<3) | (inverter<<2) | (clear_man_update<<1) | (start<<0)
	str r2, [r1]
 
	ldr	r2, =GPBDAT
	ldr	r1, =0x1a0
	str	r1, [r2]
 
	mov	pc,lr
 
main:
 
	ldr r1,=TCON
	ldr r2,=(DZ_eable<<4) | (auto_reload<<3) | (inverter<<2) | (man_update<<1) | (stop<<0)
	str r2, [r1]
 
       ldr lr, =loop                            
                  
 	ldr	pc, _pwm_uart_test
 
_pwm_uart_test:	.word pwm_uart_test
loop:
     	b loop                                               @ 死循环
 
 
 
 
 
undefined_instruction:
			nop
software_interrupt:
			nop
prefetch_abort:	
			nop
data_abort:
			nop
not_used:
			nop
fiq:
			nop

#include "pwm_uart_test.h"
extern void Buzzer_Freq_Set(int freq);
//extern void Buzzer_Freq_Set( void );
char uart_GetByte(void)
{
		while(!(rUTRSTAT0 & 0x1));   //Wait until THR is empty.
			return RdURXH0();
}
 
 
void uart_GetString(char *pt)
{
	while(*pt)
		uart_GetByte();
}
 
 
void uart_SendByte(int data)
{
	
		if(data=='\n')
		{
			while(!(rUTRSTAT0 & 0x2));
			WrUTXH0('\r');
		}
		while(!(rUTRSTAT0 & 0x2));   //Wait until THR is empty.
		WrUTXH0(data);
 
}               
 
//====================================================================
void uart_SendString(char *pt)
{
	while(*pt)
	       uart_SendByte(*pt++);
}
 
 
void uart_test(void)
{
	
	char str[20] = "\nhello world\n";
	int a = 97;
	//while(1)
	//	uart_SendByte(a);	
	uart_SendString(str);
	char s = uart_GetByte();
	//if(s == 'a')
	if(s == 97)
		rGPBDAT = 0x1c0;
	//uart_SendByte(a);
	//uart_SendByte(97);
	//uart_SendByte('a');
	uart_SendByte((int)s);
	uart_SendByte((int)'s');
}
 
void pwm_uart_test(void)
{
	int freq = 10;
	Buzzer_Freq_Set( freq ) ;
	//Buzzer_Freq_Set(  ) ;
 
	uart_SendString("start\n");
/*
	int i;
	for(i=0;i<1000;i++)
		uart_SendString("wait\n");
    while( 1 )
    {
		char key = uart_GetByte();
		uart_SendByte(key);
		if( key == 'a' || key == 'A' )
		{
			if( freq < 2000 )  //lci  20000
				freq += 10 ;
				uart_SendByte('a');
			Buzzer_Freq_Set( freq ) ;
		}
		if( key == 'b' || key == 'B' )
		{
			if( freq > 11 )
				freq -= 10 ;
				uart_SendByte('b');
			Buzzer_Freq_Set( freq ) ;
		}
		
		//uart_SendString( "\tFreq = %d\n", freq ) ;
		//if( key == ESC_KEY )
		//{
		//	Buzzer_Stop() ;
		//	return ;
		//}
	}
*/
}