[Not Solved] ][Embedded] [FL2440] ADS实验六: ADC实验: 还没有完全理解代码

1.6-adc\init.s

============================================================================================================

AREA |DATA|,CODE,READONLYENTRYldr r13, =0x1000; Set spIMPORT adcMainb adcMainEND

1.6-adc\include.h

============================================================================================================

#ifndef include_h#define include_h// nand#define rNFCONF(*(volatile unsigned *)0x4e000000)#define rNFCONT (*(volatile unsigned *)0x4e000004)#define rNFCMD  (*(volatile unsigned *)0x4e000008)#define rNFADDR (*(volatile unsigned *)0x4e00000c)#define rNFDATA (*(volatile unsigned *)0x4e000010)#define rNFDATA8 (*(volatile unsigned char *)0x4e000010)#define rNFMECC0 (*(volatile unsigned *)0x4e00002c)#define rNFSTAT (*(volatile unsigned *)0x4e000020)#define rNFESTAT0 (*(volatile unsigned *)0x4e000024)// uart#define rUTRSTAT0 (*(volatile unsigned *)0x50000010)// UART 0 Tx/Rx status#define rULCON0  (*(volatile unsigned *)0x50000000)// UART 0 Line Control#define rUCON0  (*(volatile unsigned *)0x50000004)// UART 0 Control#define rUFCON0  (*(volatile unsigned *)0x50000008)// UART 0 FIFO control#define rUBRDIV0  (*(volatile unsigned *)0x50000028) // UART 0 Baud rate divisor#define WrUTXH0(ch) (*(volatile unsigned char *)0x50000020)=(unsigned char)(ch)#define RdURXH0() (*(volatile unsigned char *)0x50000027)// adc#define rADCCON (*(volatile unsigned *)0x58000000)#define rADCDAT0 (*(volatile unsigned *)0x5800000c)#define EnNandFlash()(rNFCONT |= 1)// Enable Nand Flash controller#define DsNandFlash()(rNFCONT &= ~1) // Disable NF controller#define NFChipEn()(rNFCONT &= ~(1 << 1)) // Enable chip select#define NFChipDs()(rNFCONT |= (1 << 1))  // Disable chip select#define InitEcc()(rNFCONT |= (1 << 4)) // init ECC decoder/encoder#define MEccUnlock()(rNFCONT &= ~(1 << 5))#define MEccLock()(rNFCONT != (1 << 5))#define SEccUnlock()(rNFCONT &= ~(1 << 6))#define SEccLock()(rNFCONT != (1 << 6))#define WrNFDat8(dat)(rNFDATA8 = (dat))#define WrNFDat32(da)(rNFDATA = (dat))#define RdNFDat8()(rNFDATA8)// byte access#define RdNFDat32()(rNFDATA)// word access#define WrNFCmd(cmd)(rNFCMD = (cmd))#define WrNFAddr(addr)(rNFADDR = (addr))#define WrNFDat(dat)WrNFDat8(dat)#define RdNFdat()RdNFDat8()  // for 8 bit nand flash, use byte access#define RdNFMEcc()(rNFMECC0) // for 8 bit nand flash, only use NFMECC0#define RdNFSEcc()(rNFSECC)  // for 8 bit nand flash, only use low 16 bits#define RdNFStat(rNFSTAT)#define NFIsBusy(!(rNFSTAT & 1))#define NFIsReady(rNFSTAT & 1)#define READCMD00#define READCMD10x30#define EREASECMD00x60#define EREASECMD10xd0#define PROGCMD00x80#define PROGCMD10x10#define QUERYCMD0x70#defineRdIDCMD0x90#define TACLS1// 7 1-clk (0ns)#define TWRPH04// 7 3-clk (25ns)#define TWRPH11// 7 1-clk (10ns)#define U32 unsigned int#define U16  unsigned short#define S32  int#define S16  short int#define U8   unsigned char#define S8   char#defineTRUE 1#define FALSE 0#define OK 1#define FAIL 0#define ESC_KEY 0x1b#endif

1.6-adc/uart.c

============================================================================================================

#include "include.h"#include <stdarg.h>void Uart_Init(int baud){int i;rUFCON0 = 0x0; // UART channel 0 FIFO control register, FIFO disable// UART 0// Line control register: Normal, No parioty, 1 stop, 8 bitsrULCON0 = 0x3;rUCON0 = 0x805;// Control register// Baud rate divisor register 0rUBRDIV0 = ((int)(50000000 / 16.0 / baud + 0.5) - 1);// UART 1for (i = 0; i < 100; i++);}void Uart_SendByte(int data){if (data == '\n') {while (!(rUTRSTAT0 & 0x2));// delay(1); // because the slow response of hyper_terminalWrUTXH0('\r');}while (!(rUTRSTAT0 & 0x2)) // Wait until THR is empty;// delay(1);WrUTXH0(data);}void Uart_SendString(S8 *pt){while (*pt)Uart_SendByte(*pt++);}// If you don't use vsprintf(), the code size is reduced very muchvoid Uart_Printf(S8 *fmt, ...){va_list ap;S8 str[255];va_start(ap, fmt);vsprintf(str, fmt, ap);Uart_SendString(str);va_end(ap);}

1.6-adc/main.c

============================================================================================================

/* by [e-mail] * Refer to: www.witech.com.cn *//**********************按键实验*********************************/// 公司名称 ：保定飞凌嵌入式技术有限公司// 描    述 ：ADC数据采集// 版    权 ：保定飞凌嵌入式技术有限公司// 网    址 ：www.witech.com.cn/***************************************************************/#include "include.h"/*-------------------------- 地址声明 ---------------------------------*/#define rUTXH0 (*(volatile unsigned *)0x50000020)#define rURXH0 (*(volatile unsigned *)0x50000024)/*--------------------------- 变量定义 --------------------------------*/U32 ADC_FREQ = 115200 * 16;U32 preScaler;/*--------------------------- Declare functions -----------------------*/void delay(int count);char Uart_GetKey(void);int ReadAd(void);void Test_Adc(void);/* * Function: delay * DESC:delay 'count' ms * Param:int count * RETURN:None */void delay(int count){unsigned int i;while (--count != 0) {for (i = 0; i < 0xff; i++);}}/* * Function:Uart_GetKey * DESC:判断接收到的串口 * Param:None * RETURN:rURXH0 */char Uart_GetKey(void){if (rUTRSTAT0 & 0x01)return rURXH0;elsereturn 0;}/* * Function: adcMain * DESC:Entry program * Param:None * RETURN:None */void adcMain(void){U8i;Uart_Init(115200); // 出事换串口Test_Adc();// 进入采样while (1) ;}/* * Function: ReadAd * DESC:读取ADCCON, ADCDAT, 返回当次采样值 * Param:None * RETURN:int */int ReadAd(void){// 打开预分频器,设置预分频数,设置ADC通道,设置为AIN0rADCCON = (1 << 14) | (49 << 6) | (0 << 3);// 开始ADC, 真正开始转换时, ENABLE_START自动清0rADCCON |= 0x1;// 等待ADC使能位ENABlE_START置零while (rADCCON & 0x1);// 等待本次ADC采样结束, EGFLG位置1后表示转换结束while (!(rADCCON & 0x8000));// 采样值范围: 0 ~ 0x3ff 低10位为采样有效数据return ((int)rADCDAT0 & 0x3ff);}/* * Function: Test_Adc * DESC:采样ADC值并想串口输出数据 * Param:None * RETURN:None */void Test_Adc(void){int a0 = 0;// 用来保存采样函数返回的采样值// 本开发版PCLK: 50MHzpreScaler = 50000000 / ADC_FREQ - 1;// 给串口输出采样率Uart_Printf("PCL / ADC_FREQ - 1 = %d\n", preScaler);// 收到退出信号后退出 whilewhile (Uart_GetKey() != ESC_KEY) {a0 = ReadAd();// 向串口输出本次采样到的数值Uart_Printf("AIN0: %04d\n", a0);delay(500);}Uart_Printf("\nADC INPUT Test over!\n");}