BF532芯片内调试UART程序

今天写了一段UART串口消息输出调试代码，用于加载到芯片L1 RAM中运行测试UART的连接情况，成功输出信息：Hello Bfincn
代码比较简单，大家看看就明白了。

#include "bin2ldr.h"

#define hi(x) (x >> 16)
#define lo(x) (x & 0xffff)

/* UART Controller (0xFFC00400 - 0xFFC004FF) */
/* Transmit Holding register */
#define UART_THR   0xFFC00400 
/* Receive Buffer register */
#define UART_RBR   0xFFC00400 
/* Divisor Latch (Low-Byte) */
#define UART_DLL   0xFFC00400 
/* Interrupt Enable Register */
#define UART_IER   0xFFC00404 
/* Divisor Latch (High-Byte) */
#define UART_DLH   0xFFC00404 
/* Interrupt Identification Register */
#define UART_IIR   0xFFC00408 
/* Line Control Register */
#define UART_LCR   0xFFC0040C 
/* Modem Control Register */
#define UART_MCR   0xFFC00410 
/* Line Status Register */
#define UART_LSR   0xFFC00414 
/* SCR Scratch Register */
#define UART_SCR   0xFFC0041C 
/* Global Control Register */
#define UART_GCTL  0xFFC00424 


/* Initialise UART */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);

/* 8-bit word; 1 stop bit; No parity */
r0 = 0x83(Z);
w[p0] = r0.l; /* To enable DLL writes */
ssync;

p0.h = hi(UART_DLL);
p0.l = lo(UART_DLL);

/* SCLK = 133MHz, BaudRate=115200
   BaudRate = SCLK /(16 * Divisor) */
r0 = 0x48(Z);
w[p0] = r0.l;
ssync;

p0.h = hi(UART_DLH);
p0.l = lo(UART_DLH);
r0 = 0x00(Z);
w[p0] = r0.l;
ssync;

p0.h = hi(UART_GCTL);
p0.l = lo(UART_GCTL);
r0 = 0x1(Z);
w[p0] = r0.l; /* To enable UART clock */
ssync;
 
/* Begin to process rx/tx data */
p0.h = hi(UART_LCR);
p0.l = lo(UART_LCR);

/* 8-bit word; 1 stop bit; No parity */
r0 = 0x03(Z);
/* To enable access THR/PBR */
w[p0] = r0.l; 
ssync;
 
/* Write 'Hello Bfincn' to Console */
p0.h = hi(UART_THR);
p0.l = lo(UART_THR);
r0 = 0x48(Z); /* H */
w[p0] = r0.l; 
ssync;
 
ww1:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww1;

 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x65(Z); /* e */
 w[p0] = r0.l; 
 ssync;

ww2:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww2;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x6c(Z); /* l */
 w[p0] = r0.l; 
 ssync;

ww3:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww3;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x6c(Z); /* l */
 w[p0] = r0.l; 
 ssync;

ww4:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww4;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x6f(Z); /* l */
 w[p0] = r0.l; 
 ssync;

ww5:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww5;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x20(Z); /* space */
 w[p0] = r0.l; 
 ssync;

ww6:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww6;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x42(Z); /* B */
 w[p0] = r0.l; 
 ssync;

ww7:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww7;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x66(Z); /* f */
 w[p0] = r0.l; 
 ssync;

ww8:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww8;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x69(Z); /* i */
 w[p0] = r0.l; 
 ssync;

ww9:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww9;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x6e(Z); /* n */
 w[p0] = r0.l; 
 ssync;

ww10:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww10;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x63(Z); /* c */
 w[p0] = r0.l; 
 ssync;

ww11:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump ww11;
  
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 r0 = 0x6e(Z); /* n */
 w[p0] = r0.l; 
 ssync;
 
ww12:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,0);
 if !cc jump ww12;
  
 /* read from buffer */
 p0.h = hi(UART_RBR);
 p0.l = lo(UART_RBR);
 r1 = w[p0](z);
 
/* send buffer is empty or not */
wait:
 p0.h = hi(UART_LSR);
 p0.l = lo(UART_LSR);
 r0 = w[p0](z);
 cc = bittst(r0,5);
 if !cc jump wait;

 /* write back to console */
 p0.h = hi(UART_THR);
 p0.l = lo(UART_THR);
 w[p0] = r1.l; 
 ssync;
 
 /* if user enter the char 'q' then exit */
 r1 = 0x72(z);
 cc = r0 == r1; /* q */
 if !cc jump ww12;

 p0.l = (APP_ENTRY & 0xFFFF);
 p0.h = (APP_ENTRY >> 16);
 jump (p0);