蜂鸣器驱动

蜂鸣器驱动：

  1、原理图

  GPD0_0<---->PWM TOUT0

 

  2、芯片手册

  CPD0CON 0x114000A0   1

  (1)[3:0] <=== 0x2

c

 

  TCFG0 139D0000    2

  (2)[7:0] <== 0~255    0xff

 

  TCFG1 139D0004

  (3)[3:0] <== 0~4    0x1

  TCON  139D0008

  (6)[3:0] <== 0x2

  (7)[3:0] <== 0x9

  TCNTB0 139D000C

  (4)[31:0] <===?   0x200

  TCMPB0 139D0010

  (5)[31:0] <===? 必须小于TCNTB0  0x100

#define PWM_ON _IO('K', 0)     ----开定时器 TCON

#define PWM_OFF _IO('K', 1)     ----关定时器 TCON

#define SET_PRE _IOW('K', 2, int)   ----设置预分频值 TCFG0

#define SET_CNT _IOW('K', 3, int)   ----设置周期  TCNTB0 = 2TCMPB0