RedBearLab / Mbed 2 deprecated I2C_on_mbed_AT24cxxx

I2C with AT24Cxxx

Dependencies:   mbed

main.cpp@2:9551fe55f227, 2016-01-07 (annotated)

Committer:
RedBearLab
Date:
Thu Jan 07 02:58:22 2016 +0000
Revision:
2:9551fe55f227
Parent:
0:a9d57902bf67 
Update libraries.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RedBearLab 0:a9d57902bf67 1
RedBearLab 0:a9d57902bf67 2 #include "mbed.h"
RedBearLab 0:a9d57902bf67 3
RedBearLab 0:a9d57902bf67 4 #define DEV_ADDR 0xA0
RedBearLab 0:a9d57902bf67 5
RedBearLab 0:a9d57902bf67 6 I2C i2c(P0_29, P0_28);
RedBearLab 0:a9d57902bf67 7 Serial pc(USBTX, USBRX);
RedBearLab 0:a9d57902bf67 8
RedBearLab 0:a9d57902bf67 9 /**********************************************************************
RedBearLab 0:a9d57902bf67 10 * @brief : Write data to AT24C512
RedBearLab 0:a9d57902bf67 11 *
RedBearLab 0:a9d57902bf67 12 * @param[in] addr : The address of stored
RedBearLab 0:a9d57902bf67 13 * @param[in] *pbuf : The pointer of data
RedBearLab 0:a9d57902bf67 14 * @param[in] length : The length of data
RedBearLab 0:a9d57902bf67 15 *
RedBearLab 0:a9d57902bf67 16 * @return none
RedBearLab 0:a9d57902bf67 17 **********************************************************************/
RedBearLab 0:a9d57902bf67 18 void AT24C512_WriteBytes(uint16_t addr, uint8_t *pbuf, uint16_t length)
RedBearLab 0:a9d57902bf67 19 {
RedBearLab 0:a9d57902bf67 20 char buf[length+2];
RedBearLab 0:a9d57902bf67 21 buf[0] = (uint8_t)(addr>>8);
RedBearLab 0:a9d57902bf67 22 buf[1] = (uint8_t)(addr);
RedBearLab 0:a9d57902bf67 23 memcpy(&buf[2], pbuf, length);
RedBearLab 0:a9d57902bf67 24 i2c.write(DEV_ADDR, buf, length+2, false);
RedBearLab 0:a9d57902bf67 25 }
RedBearLab 0:a9d57902bf67 26 /**********************************************************************
RedBearLab 0:a9d57902bf67 27 * @brief : Read data from AT24C512
RedBearLab 0:a9d57902bf67 28 *
RedBearLab 0:a9d57902bf67 29 * @param[in] addr : The address of read in AT24C512
RedBearLab 0:a9d57902bf67 30 * @param[out] *pbuf : The pointer of buffer
RedBearLab 0:a9d57902bf67 31 * @param[in] length : The length of data
RedBearLab 0:a9d57902bf67 32 *
RedBearLab 0:a9d57902bf67 33 * @return none
RedBearLab 0:a9d57902bf67 34 **********************************************************************/
RedBearLab 0:a9d57902bf67 35 void AT24C512_ReadBytes(uint16_t addr, uint8_t *pbuf, uint16_t length)
RedBearLab 0:a9d57902bf67 36 {
RedBearLab 0:a9d57902bf67 37 char buf[2];
RedBearLab 0:a9d57902bf67 38 buf[0] = (uint8_t)(addr>>8);
RedBearLab 0:a9d57902bf67 39 buf[1] = (uint8_t)(addr);
RedBearLab 0:a9d57902bf67 40 i2c.write(DEV_ADDR, buf, 2, false);
RedBearLab 0:a9d57902bf67 41
RedBearLab 0:a9d57902bf67 42 i2c.read(DEV_ADDR, (char *)pbuf, length, false);
RedBearLab 0:a9d57902bf67 43 }
RedBearLab 0:a9d57902bf67 44
RedBearLab 0:a9d57902bf67 45
RedBearLab 0:a9d57902bf67 46 uint8_t w_buf[11]={'H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd', '!'};
RedBearLab 0:a9d57902bf67 47 uint8_t r_buf[11];
RedBearLab 0:a9d57902bf67 48
RedBearLab 0:a9d57902bf67 49
RedBearLab 0:a9d57902bf67 50 int main(void)
RedBearLab 0:a9d57902bf67 51 {
RedBearLab 0:a9d57902bf67 52 uint8_t index;
RedBearLab 0:a9d57902bf67 53
RedBearLab 0:a9d57902bf67 54 pc.baud(9600);
RedBearLab 0:a9d57902bf67 55 pc.printf("IIC Demo Start \r\n");
RedBearLab 0:a9d57902bf67 56
RedBearLab 0:a9d57902bf67 57 while(1)
RedBearLab 0:a9d57902bf67 58 {
RedBearLab 0:a9d57902bf67 59 wait(2);
RedBearLab 0:a9d57902bf67 60 AT24C512_WriteBytes(0, w_buf, 11);
RedBearLab 0:a9d57902bf67 61 wait(0.5);
RedBearLab 0:a9d57902bf67 62 AT24C512_ReadBytes(0, r_buf, 11);
RedBearLab 0:a9d57902bf67 63 for(index=0; index<11; index++)
RedBearLab 0:a9d57902bf67 64 pc.putc(r_buf[index]);
RedBearLab 0:a9d57902bf67 65
RedBearLab 0:a9d57902bf67 66 pc.printf("\r\n");
RedBearLab 0:a9d57902bf67 67 }
RedBearLab 0:a9d57902bf67 68 }
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