main.cpp

00001 
00002 #include "mbed.h"
00003 
00004 #define DEV_ADDR    0xA0
00005 
00006 I2C     i2c(P0_29, P0_28);
00007 Serial  pc(USBTX, USBRX);
00008 
00009 /**********************************************************************
00010 * @brief            :  Write data to AT24C512
00011 * 
00012 * @param[in] addr   : The address of stored
00013 * @param[in] *pbuf  : The pointer of data
00014 * @param[in] length : The length of data
00015 *
00016 * @return none
00017 **********************************************************************/
00018 void AT24C512_WriteBytes(uint16_t addr, uint8_t *pbuf, uint16_t length)
00019 {
00020     char buf[length+2];
00021     buf[0] = (uint8_t)(addr>>8);
00022     buf[1] = (uint8_t)(addr);
00023     memcpy(&buf[2], pbuf, length); 
00024     i2c.write(DEV_ADDR, buf, length+2, false);
00025 }
00026 /**********************************************************************
00027 * @brief            :  Read data from AT24C512
00028 * 
00029 * @param[in] addr   : The address of read in AT24C512
00030 * @param[out] *pbuf : The pointer of buffer 
00031 * @param[in] length : The length of data
00032 *
00033 * @return none
00034 **********************************************************************/
00035 void AT24C512_ReadBytes(uint16_t addr, uint8_t *pbuf, uint16_t length)
00036 {
00037     char buf[2];
00038     buf[0] = (uint8_t)(addr>>8);
00039     buf[1] = (uint8_t)(addr);
00040     i2c.write(DEV_ADDR, buf, 2, false);
00041     
00042     i2c.read(DEV_ADDR, (char *)pbuf, length, false);
00043 }
00044 
00045 
00046 uint8_t w_buf[11]={'H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd', '!'};
00047 uint8_t r_buf[11];
00048 
00049 
00050 int main(void)
00051 {
00052     uint8_t index;
00053     
00054     pc.baud(9600);
00055     pc.printf("IIC Demo Start \r\n");
00056     
00057     while(1)
00058     {
00059         wait(2);
00060         AT24C512_WriteBytes(0, w_buf, 11);
00061         wait(0.5);
00062         AT24C512_ReadBytes(0, r_buf, 11);
00063         for(index=0; index<11; index++)
00064          pc.putc(r_buf[index]);
00065          
00066         pc.printf("\r\n");
00067     }
00068 }
00069 
00070 
00071 
00072 
00073 
00074 
00075 
00076 
00077 
00078 
00079 
00080 
00081 
00082 
00083 
00084 
00085 
00086 
00087 
00088