GNU ARM汇编--(十)s3c2440的RTC

用BCD码表示的秒 分 时 日期 月份 年

给出报警中断的rtc汇编和c代码如下,在报警中断时是调用PWM的蜂鸣器来做闹钟的:

start.S:

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1. /*
2. watchdogtimerwithdisablereset
3. copyleft@dndxhej@gmail.com
4. */
6. .equNOINT,0xc0
8. .equGPBCON,0x56000010@led
9. .equGPBDAT,0x56000014@led
10. .equGPBUP,0x56000018@led
11. .equGPFCON,0x56000050@interruptconfig
12. .equEINTMASK,0x560000a4
13. .equEXTINT0,0x56000088
14. .equEXTINT1,0x5600008c
15. .equEXTINT2,0x56000090
16. .equINTMSK,0x4A000008
17. .equEINTPEND,0x560000a8
19. .equSUBSRCPND,0x4a000018
20. .equINTSUBMSK,0x4a00001c
24. .equSRCPND,0X4A000000
25. .equINTPND,0X4A000010
28. .equGPHCON,0x56000070
29. .equGPHDAT,0x56000074
31. .equGPB5_out,(1<(5*2))
32. .equGPB6_out,(1<(6*2))
33. .equGPB7_out,(1<(7*2))
34. .equGPB8_out,(1<(8*2))
36. .equGPBVALUE,(GPB5_out|GPB6_out|GPB7_out|GPB8_out)
38. .equLOCKTIME,0x4c000000
39. .equMPLLCON,0x4c000004
40. .equUPLLCON,0x4c000008
41. .equM_Mdiv,92
42. .equM_Pdiv,1
43. .equM_Sdiv,1
44. .equU_Mdiv,56
45. .equU_Pdiv,2
46. .equU_Sdiv,2
48. .equCLKdivN,0x4c000014
49. .equdivN_UPLL,0
50. .equHdivN,1
51. .equPdivN,1@FCLK:HCLK:PCLK=1:2:4
54. .equWTCON,0x53000000
55. .equPre_scaler,249
56. .equwd_timer,1
57. .equclock_select,00@316
58. .equint_gen,1@开中断
59. .equreset_enable,0@关掉重启信号
61. .equWTDAT,0x53000004
62. .equCount_reload,50000@定时器定为2SPCLK=100MPCLK/(Pre_scaler+1)/clock_select=100M/(249+1)/16=25k50000/25k=2s
64. .equWTCNT,0x53000008
65. .equCount,50000
68. .equTCFG0,0x51000000
69. .equPrescaler1,0x00@[15:8]Timer234
70. .equPrescaler0,249@[7:0]Timer01
72. .equTCFG1,0x51000004
73. .equDMA_MODE,0x0@[23:20]nodmachannal
74. .equMUX0,0x2@[3:0]1/8
75. @定时器输入时钟周期=PCLK/(prescaler+1)/(dividervalue)
76. @clk=100M/(249+1)/8=25k
78. .equTCON,0x51000008
79. .equDZ_eable,0@[4]关闭死区的操作
80. .equauto_reload,1@[3]auto_reload
81. .equinverter,1@[2]打开电平反转
82. .equman_update,1@[1]手动更新
83. .equclear_man_update,0
84. .equstart,1@[0]开始
85. .equstop,0@[0]停止
87. .equTCNTB0,0x5100000c
88. .equTCMPB0,0x51000010
90. .equTCNTO0,0x51000014
93. .equULCON0,0x50000000
94. .equIR_MODE,0x0@[6]正常模式
95. .equParity_Mode,0x0@[5:3]无校验位
96. .equNum_of_stop_bit,0x0@[2]一个停止位
97. .equWord_length,0b11@[1:0]8个数据位
99. .equUCON0,0x50000004
100. .equFCLK_Div,0@[15:12]时钟源选择用PCLK,所以这里用默认值
101. .equClk_select,0b00@[11:10]时钟源选择使用PCLK
102. .equTx_Int_Type,1@[9]中断请求类型为Level
103. .equRx_Int_Type,0@1@[8]中断请求类型为Level
104. .equRx_Timeout,0@[7]
105. .equRx_Error_Stat_Int,1@[6]
106. .equLoopback_Mode,0@[5]正常模式
107. .equBreak_Sig,0@[4]不发送终止信号
108. .equTx_Mode,0b01@[3:2]中断请求或轮循模式
109. .equRx_Mode,0b01@[1:0]中断请求或轮循模式
111. .equUFCON0,0x50000008
112. .equTx_FIFO_Trig_Level,0b00@[7:6]
113. .equRx_FIFO_Trig_Level,0b00@[5:4]
114. .equTx_FIFO_Reset,0b0@[2]
115. .equRx_FIFO_Reset,0b0@[1]
116. .equFIFO_Enable,0b0@[0]非FIFO模式
118. .equUMCON0,0x5000000C@这个寄存器可以不管的
119. .equUTRSTAT0,0x50000010
120. .equUERSTAT0,0x50000014
121. .equUFSTAT0,0x50000018
122. .equUMSTAT0,0x5000001C
123. .equUTXH0,0x50000020@(L小端)
124. .equURXH0,0x50000024@(L小端)
126. .equUBRdiv0,0x50000028
127. .equUBRdiv,0x35@PCLK=400M/4=100MUBRdiv=(int)(100M/115200/16)-1=53=0x35
130. .equBCDMIN,0x57000074
132. .equBCDSEC,0x57000070
134. //.globalBuzzer_Freq_Set
136. .global_start
137. _start:breset
138. ldrpc,_undefined_instruction
139. ldrpc,_software_interrupt
140. ldrpc,_prefetch_abort
141. ldrpc,_data_abort
142. ldrpc,_not_used
143. @birq
144. ldrpc,_irq
145. ldrpc,_fiq
149. _undefined_instruction:.wordundefined_instruction
150. _software_interrupt:.wordsoftware_interrupt
151. _prefetch_abort:.wordprefetch_abort
152. _data_abort:.worddata_abort
153. _not_used:.wordnot_used
154. _irq:.wordirq
155. _fiq:.wordfiq
157. .balignl16,0xdeadbeef
159. reset:
162. ldrr3,=WTCON
163. movr4,#0x0
164. strr4,[r3]@disablewatchdog
166. ldrr0,=GPBCON
167. ldrr1,=0x15400@这个时候暂不配置GPB0为TOUT0
168. strr1,[r0]
170. ldrr2,=GPBDAT
171. ldrr1,=0x160
172. strr1,[r2]
174. blclock_setup
175. bluart_init
176. bldelay
179. msrcpsr_c,#0xd2@进入中断模式
180. ldrsp,=3072@中断模式的栈指针定义
182. msrcpsr_c,#0xd3@进入系统模式
183. ldrsp,=4096@设置系统模式的栈指针
185. @--------------------------------------------
187. ldrr0,=GPBUP
188. ldrr1,=0x03f0
189. strr1,[r0]
191. ldrr0,=GPFCON
192. ldrr1,=0x2ea@0x2
193. strr1,[r0]
195. ldrr0,=EXTINT0
196. @ldrr1,