00001
00039 #include "lm75.h"
00040
00041 #include "hw/hw_lm75.h"
00042
00043 #include "cfg/cfg_lm75.h"
00044
00045 #include <cfg/debug.h>
00046 #include <cfg/module.h>
00047
00048 // Define logging setting (for cfg/log.h module).
00049 #define LOG_LEVEL   LM75_LOG_LEVEL
00050 #define LOG_FORMAT  LM75_LOG_FORMAT
00051 
00052 #include <cfg/log.h>
00053
00054 #include <drv/i2c.h>
00055 #include <drv/ntc.h> // Macro and data type to manage celsius degree
00056
00057 #define SELECT_ADDRESS(addr)   LM75_ADDRESS_BYTE | (addr << 1)
00058 #define LM75_ADDRESS_BYTE    0x91
00059 #define LM75_PAD_BYTE        0x0
00060 
00061
00062 #if !CONFIG_I2C_DISABLE_OLD_API
00063 
00064 deg_t lm75_read_1(uint8_t sens_addr)
00065 {
00066     return lm75_read_2(&local_i2c_old_api, sens_addr);
00067 }
00068 #endif /* !CONFIG_I2C_DISABLE_OLD_API */
00069
00070
00071 /*
00072  * New API
00073  */
00074 deg_t lm75_read_2(I2c *i2c, uint8_t sens_addr)
00075 {
00076     uint8_t data[2];
00077     int16_t deci_degree;
00078
00079     i2c_start_w(i2c, SELECT_ADDRESS(sens_addr), 1, I2C_NOSTOP);
00080     i2c_putc(i2c, LM75_PAD_BYTE);
00081     i2c_start_r(i2c, SELECT_ADDRESS(sens_addr), sizeof(data), I2C_STOP);
00082     i2c_read(i2c, data, sizeof(data));
00083
00084     if (i2c_error(i2c))
00085         return EOF;
00086
00087     deci_degree = ((data[0] << 8) | data[1]);
00088     deci_degree >>= 7;
00089     deci_degree *= 5;
00090
00091     LOG_INFO("[%d.%d C]\n", deci_degree / 10, ABS(deci_degree % 10));
00092
00093     return deci_degree;
00094 }