i2c_base.cpp

00001 #include "wiced_types.h"
00002 #include "i2c_base.h"
00003 extern void DebugWrite(const char* str);
00004 
00005 void cleanI2CLines(I2C* dev, PinName sda, PinName scl)
00006 {
00007     delete dev;
00008     dev = new I2C(sda, scl);
00009 //    wiced_rtos_lock_mutex(&i2c_mutex);
00010     // toggle
00011     /*
00012         int limit = 260;
00013         while (limit-- > 0)
00014         {
00015             wiced_bool_t SDAstate = wiced_gpio_input_get(WICED_GPIO_12);
00016             wiced_bool_t SCLstate = wiced_gpio_input_get(WICED_GPIO_11);
00017             wiced_gpio_init(WICED_GPIO_11, OUTPUT_PUSH_PULL);
00018             wiced_gpio_init(WICED_GPIO_12, INPUT_HIGH_IMPEDANCE);
00019             //printf("SDA is %d, SCL is %d\r\n", SDAstate, SCLstate);
00020             if ((SDAstate == WICED_TRUE) && (SCLstate == WICED_TRUE))
00021             {
00022                 break;
00023             }
00024             else
00025             {
00026                 printf("Pulsing SCL\r\n");
00027                 // pulse SDA
00028                 wiced_gpio_output_low(WICED_GPIO_11);
00029                 wiced_rtos_delay_milliseconds(10);
00030                 wiced_gpio_output_high(WICED_GPIO_11);
00031                 wiced_rtos_delay_milliseconds(10);
00032             }
00033         }
00034 
00035         // need to return to input/HI mode or doesn't init properly.
00036         wiced_gpio_init(WICED_GPIO_11, INPUT_HIGH_IMPEDANCE);
00037         wiced_gpio_init(WICED_GPIO_12, OUTPUT_OPEN_DRAIN_PULL_UP);
00038     */
00039 //   wiced_rtos_unlock_mutex(&i2c_mutex);
00040 }
00041 
00042 wiced_result_t readRegs(unsigned char addr, unsigned char * data, unsigned char len, I2C* i2c_dev, const int addr7bit, int* failcount, wiced_bool_t writeThenRead,
00043         wiced_bool_t swap)
00044 {
00045     int addr8bit = addr7bit << 1;
00046     int result = 0;
00047     if (writeThenRead) {
00048         // not implemented yet
00049         DebugWrite("Not implemented yet\r\n");
00050         result = 1;
00051        
00052     } else {
00053          const char t[1] = {addr};
00054         result = i2c_dev->write(addr8bit, t, 1, true);
00055         result = i2c_dev->read(addr8bit, (char *)data, len);
00056     }
00057     
00058     if (result > 0) {
00059         return WICED_ERROR;    
00060     }
00061     return WICED_SUCCESS;
00062 }
00063 
00064 wiced_result_t writeRegs(unsigned char addr, unsigned char * data, unsigned char len, I2C* i2c_dev, const int addr7bit, int* i2cfailcount, wiced_bool_t swap)
00065 {
00066     uint8_t command[4];
00067     int addr8bit = addr7bit << 1;
00068     int result = 1;
00069     command[0] = addr;
00070     if (len == 1)
00071     {
00072         command[1] = (data[0] & 0xFF);
00073     }
00074     result = i2c_dev->write(addr8bit, (char *)command, len+1);
00075     if (result > 0) {
00076         return WICED_ERROR;
00077     }
00078     return WICED_SUCCESS;
00079 }