【LPC800项目】代码分享:串口初始化.

andrewz

调好了时钟,对于这块已经无法用swd进行调试的"半残"板子,立马做的事情就是调串口.

下面是代码,部分代码涉及更多应用方面的内容,就删除了.只保留最底层的部分.

1. #define _UART_GLOBAL_
   
2. #include "./bsp/peripheral/uart.h"
   
3. #include "./bsp/chip/LPC8xx.h"
   
4. #include "./bsp/peripheral/swm.h"
   
5. 
   
6. #define SYSCON_SYSAHBCLKCTRL_UART0      ((unsigned long)1<<14)
   
7. 
   
8. #define SYSCON_PRESETCTRL_UARTFRG_RST_N ((unsigned long)1<<2)
   
9. #define SYSCON_PRESETCTRL_UART0_RST_N   ((unsigned long)1<<3)
   
10. 
    
11. 
    
12. #define USART_CFG_ENABLE                ((unsigned long)1<<0)
    
13. #define USART_CFG_DATALEN_MASK          ((unsigned long)0x0000000C)
    
14. #define USART_CFG_DATALEN_SHIFT         ((unsigned long)2)
    
15. 
    
16. #define USART_INTENSET_RXRDYEN          ((unsigned long)1<<0)
    
17. #define USART_INTENSET_TXRDYEN          ((unsigned long)1<<2)
    
18. #define USART_INTENCLR_TXRDYCLR         ((unsigned long)1<<2)
    
19. 
    
20. #define USART_STAT_RXRDY                ((unsigned long)1<<0)
    
21. #define USART_STAT_TXRDY                ((unsigned long)1<<2)
    
22.    
    
23. 
    
24. void enable_tx_int(void);
    
25. void disable_tx_int(void);
    
26. 
    
27. unsigned char temp_o;
    
28. unsigned char temp_i;
    
29. 
    
30. void UART0_IRQHandler(void){
    
31.     if(LPC_USART0->STAT&USART_STAT_RXRDY){
    
32.         temp_i=LPC_USART0->RXDAT;
    
33.     }
    
34. 
    
35.     if(LPC_USART0->STAT&USART_STAT_TXRDY){
    
36.         LPC_USART0->TXDAT=temp_o;
    
37.     }
    
38. }
    
39. 
    
40. void enable_tx_int(void){
    
41.     LPC_USART0->INTENSET|=USART_INTENSET_TXRDYEN;
    
42. }
    
43. 
    
44. void disable_tx_int(void){
    
45.     LPC_USART0->INTENCLR|=USART_INTENCLR_TXRDYCLR;
    
46. }
    
47. 
    
48. 
    
49. 
    
50. void u_putc(unsigned char c){
    
51.     while((LPC_USART0->STAT&USART_STAT_TXRDY)==0);
    
52.     LPC_USART0->TXDAT=c;
    
53. }
    
54. 
    
55. 
    
56. void Uart_init(void){
    
57.     LPC_SYSCON->SYSAHBCLKCTRL|=SYSCON_SYSAHBCLKCTRL_UART0;
    
58.    
    
59.     LPC_SYSCON->PRESETCTRL&=~(SYSCON_PRESETCTRL_UART0_RST_N|SYSCON_PRESETCTRL_UARTFRG_RST_N);
    
60.     LPC_SYSCON->PRESETCTRL|=SYSCON_PRESETCTRL_UART0_RST_N|SYSCON_PRESETCTRL_UARTFRG_RST_N;
    
61.    
    
62. 
    
63.     LPC_SYSCON->SYSAHBCLKCTRL|=SYSCON_SYSAHBCLKCTRL_SWM;
    
64.     Swm_set(U0_RXD,0);
    
65.     Swm_set(U0_TXD,4);
    
66.     LPC_SYSCON->SYSAHBCLKCTRL&=~SYSCON_SYSAHBCLKCTRL_SWM;
    
67.    
    
68.    
    
69.     LPC_SYSCON->UARTCLKDIV=4;/* Something is not clear. 60M/4=15M.*/
    
70.     LPC_SYSCON->UARTFRGDIV=255;
    
71.     LPC_SYSCON->UARTFRGMULT=4;
    
72.     LPC_USART0->BRG=7;
    
73.    
    
74.     LPC_USART0->CFG=(1<<USART_CFG_DATALEN_SHIFT);
    
75.    
    
76.     LPC_USART0->INTENSET|=USART_INTENSET_RXRDYEN;
    
77.    
    
78.     NVIC_EnableIRQ(UART0_IRQn);
    
79.    
    
80.     LPC_USART0->CFG|=USART_CFG_ENABLE;
    
81. }
    
82. 
    

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其中用到了swm中的Swm_set.
贴到下面:
这是.c文件.

1. #include "./bsp/peripheral/swm.h"
   
2. #include "./bsp/chip/LPC8xx.h"
   
3. 
   
4. void Swm_set(TYPE_E_PERI_FUNCTION f,unsigned char pin_num){
   
5.     unsigned char temp=f/4;
   
6.     unsigned char shift=(f%4)*8;
   
7.     unsigned long temp_reg=LPC_SWM->PINASSIGN[temp];
   
8.     temp_reg&=~(0x000000FF<<shift);
   
9.     temp_reg|=pin_num<<shift;
   
10.     LPC_SWM->PINASSIGN[temp]=temp_reg;
    
11. }
    
12. 
    

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这是.h文件.

1. #ifndef _SWM_H_
   
2. #define _SWM_H_
   
3. 
   
4. #define SYSCON_SYSAHBCLKCTRL_SWM        ((unsigned long)1<<7)
   
5.    
   
6. typedef enum{
   
7.     U0_TXD=0,
   
8.     U0_RXD=1,
   
9.     U0_RTS=2,
   
10.     U0_CTS=3,
    
11.     U0_SCLK=4,
    
12.     U1_TXD=5,
    
13.     U1_RXD=6,
    
14.     U1_RTS=7,
    
15.     U1_CTS=8,
    
16.     U1_SCLK=9,
    
17.     U2_TXD=10,
    
18.     U2_RXD=11,
    
19.     U2_RTS=12,
    
20.     U2_CTS=13,
    
21.     U2_SCLK=14,
    
22.     SPI0_SCK=15,
    
23.     SPI0_MOSI=16,
    
24.     SPI0_MISO=17,
    
25.     SPI0_SSEL0=18,
    
26.     SPI0_SSEL1=19,
    
27.     SPI0_SSEL2=20,
    
28.     SPI0_SSEL3=21,
    
29.     SPI1_SCK=22,
    
30.     SPI1_MOSI=23,
    
31.     SPI1_MISO=24,
    
32.     SPI1_SSEL0=25,
    
33.     SPI1_SSEL1=26,
    
34.     SCT_PIN0=27,
    
35.     SCT_PIN1=28,
    
36.     SCT_PIN2=29,
    
37.     SCT_PIN3=30,
    
38.     SCT_OUT0=31,
    
39.     SCT_OUT1=32,
    
40.     SCT_OUT2=33,
    
41.     SCT_OUT3=34,
    
42.     SCT_OUT4=35,
    
43.     SCT_OUT5=36,
    
44.     I2C1_SDA=37,
    
45.     I2C1_SCL=38,
    
46.     I2C2_SDA=39,
    
47.     I2C2_SCL=40,
    
48.     I2C3_SDA=41,
    
49.     I2C3_SCL=42,
    
50.     ADC_PINTRIG0=43,
    
51.     ADC_PINTRIG1=44,
    
52.     ACMP_O=45,
    
53.     CLKOUT=46,
    
54.     GPIO_INT_BMAT=47,
    
55. }TYPE_E_PERI_FUNCTION;
    
56. 
    
57. void Swm_set(TYPE_E_PERI_FUNCTION f,unsigned char pin_num);
    
58. 
    
59. #endif//_SWM_H_..
    
60. 
    

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好了,关于上面的代码,还是参考了一下官方的教程.不过也是全部自己理解后写出来的.
如有疑问,可以留言.

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andrewz

当然,如果要用printf函数.还要加这下面的东西.

1. #include <stdio.h>
   
2. 
   
3. #pragma import(__use_no_semihosting_swi)
   
4. 
   
5. 
   
6. extern void u_putc(unsigned char ch);  /* in Serial.c */
   
7. 
   
8. struct __FILE { int handle; /* Add whatever you need here */ };
   
9. FILE __stdout;
   
10. 
    
11. 
    
12. int fputc(int ch, FILE *f) {
    
13.     u_putc((unsigned char)ch);
    
14.     return(ch);
    
15. }
    
16. 
    
17. void _sys_exit(int return_code) {
    
18.   while (1);    /* endless loop */
    
19. }
    
20. 
    

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haifeng-388081

顶一个   

leo121_3006061

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limale

顶一个，，

lkl0305

多谢分享

andrewz

haifeng-388081 发表于 2016-12-2 12:51
顶一个

谢谢~~~~

leaderpig

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laosheng886

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