Multiple I2C busses

Hello,

Thanks for your prompt reply. I have only tested the hardware setup with MCP9600s on one of the buses but it worked. I have not yet designed the boards to test the full system. If anyone is interested, here's a snippet of code for this setup

空白sensor_init () {adc_calibrate ();ADC_timer [0]= app_easy_timer(ADC_timer_delay[0],readADC0); //check if timers are all available for(int a=0;a<1;a++){ if(ADC_timer[a]==EASY_TIMER_INVALID_TIMER){ while(1);//BADBADBAD } } //for MCP amplifiers: bool init_error=false; read_ADC[0]=1; init_I2C(); for(uint8_t i=0;i<1;i++){//initialize 1 bus (8 max) set_I2C_BUS(i+1);//1 indexed for(uint8_t a=0;a<2;a++){//initialize 2 sensors ((8 max) if(!init_MCP(a))//0 indexed init_error=true; } } } void init_I2C(void){//Initialize the I2C bus for the MCP chips GPIO_ConfigurePin(I2C_SCL_PORT, I2C_SCL_PIN, INPUT_PULLUP, PID_I2C_SCL, false); //Dont configure the SDA pin yet } void set_I2C_BUS(uint8_t bus){//Select which data line is used for the I2C //release the other pins from PID_I2C_SDA //I suppose this could be cleaner if the last pin used was tracked... GPIO_ConfigurePin(I2C_SDA1_PORT, I2C_SDA1_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA2_PORT, I2C_SDA2_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA3_PORT, I2C_SDA3_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA4_PORT, I2C_SDA4_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA5_PORT, I2C_SDA5_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA6_PORT, I2C_SDA6_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA7_PORT, I2C_SDA7_PIN, INPUT, PID_GPIO, false); GPIO_ConfigurePin(I2C_SDA8_PORT, I2C_SDA8_PIN, INPUT, PID_GPIO, false); //set the new bus pin to PID_I2C_SDA switch(bus){ case 1: GPIO_ConfigurePin(I2C_SDA1_PORT, I2C_SDA1_PIN, INPUT, PID_I2C_SDA, false); break; case 2: GPIO_ConfigurePin(I2C_SDA2_PORT, I2C_SDA2_PIN, INPUT, PID_I2C_SDA, false); break; case 3: GPIO_ConfigurePin(I2C_SDA3_PORT, I2C_SDA3_PIN, INPUT, PID_I2C_SDA, false); break; case 4: GPIO_ConfigurePin(I2C_SDA4_PORT, I2C_SDA4_PIN, INPUT, PID_I2C_SDA, false); break; case 5: GPIO_ConfigurePin(I2C_SDA5_PORT, I2C_SDA5_PIN, INPUT, PID_I2C_SDA, false); break; case 6: GPIO_ConfigurePin(I2C_SDA6_PORT, I2C_SDA6_PIN, INPUT, PID_I2C_SDA, false); break; case 7: GPIO_ConfigurePin(I2C_SDA7_PORT, I2C_SDA7_PIN, INPUT, PID_I2C_SDA, false); break; case 8: GPIO_ConfigurePin(I2C_SDA8_PORT, I2C_SDA8_PIN, INPUT, PID_I2C_SDA, false); break; } } bool init_MCP(uint8_t addr){ user_i2c_init(0x60+addr, I2C_7BIT_ADDR, I2C_STANDARD, I2C_1BYTE_REGISTER, I2C_1BYTE_ADDR); //device config register, 0.0625°C ambient accuracy, 18-bit, 1 sample, shutdown mode: 0b00000001 (highest accuracy settings) if(i2c_write_2byte_MCP(0x06, 0x02)!=I2C_NO_ERROR) return 0; //initialize next sample: device status register 0x04, clear bit7 to start sample, other bits can be cleared too if(i2c_write_2byte_MCP(0x04, 0x00)!=I2C_NO_ERROR) return 0; SetWord16(I2C_ENABLE_REG, 0x0); // Disable the I2C controller SetBits16(CLK_PER_REG, I2C_ENABLE, 0); // Disable clock for I2C return 1; } uint16_t read_MCP(uint8_t addr){//read the MCP, assuming the temperature is ready user_i2c_init(0x60+addr, I2C_7BIT_ADDR, I2C_STANDARD, I2C_1BYTE_REGISTER, I2C_1BYTE_ADDR); uint16_t value=0; //device config register, 0.0625°C ambient accuracy, 18-bit, 1 sample, shutdown mode: 0b00000001 (highest accuracy settings) if(i2c_write_2byte_MCP(0x06, 0x02)!=I2C_NO_ERROR) return 0; //select register to read by first writing to select it: 0x00 for hot, 0x02 for cold(chip) temperature if(i2c_write_byte_MCP(0x00)!=I2C_NO_ERROR) value=0xFFFF; //read the two bytes from the register if(i2c_read_2byte_MCP(&value)!=I2C_NO_ERROR) value=0xFFFF; //initialize next sample: device status register, clear bit7 to start sample, other bits can be cleared too if(i2c_write_2byte_MCP(0x04, 0x00)!=I2C_NO_ERROR) value=0xFFFF; SetWord16(I2C_ENABLE_REG, 0x0); // Disable the I2C controller SetBits16(CLK_PER_REG, I2C_ENABLE, 0); // Disable clock for I2C return value;//right shift by 4 to get integer temperature (or do temp °C = MSB*16+LSB/16 if greater than 0) } #define I2C_SCL_PORT GPIO_PORT_0//pin 1 on QFN40 chip #define I2C_SCL_PIN GPIO_PIN_0 #define I2C_SDA1_PORT GPIO_PORT_0//pin 2 on QFN40 chip #define I2C_SDA1_PIN GPIO_PIN_1 #define I2C_SDA2_PORT GPIO_PORT_0//pin 3 on QFN40 chip #define I2C_SDA2_PIN GPIO_PIN_2 #define I2C_SDA3_PORT GPIO_PORT_0 #define I2C_SDA3_PIN GPIO_PIN_3 #define I2C_SDA4_PORT GPIO_PORT_2//would use P0_4, but used by UART #define I2C_SDA4_PIN GPIO_PIN_0 #define I2C_SDA5_PORT GPIO_PORT_3 #define I2C_SDA5_PIN GPIO_PIN_0 #define I2C_SDA6_PORT GPIO_PORT_2//would use P0_5 but used by UART #define I2C_SDA6_PIN GPIO_PIN_9 #define I2C_SDA7_PORT GPIO_PORT_2 #define I2C_SDA7_PIN GPIO_PIN_1 #define I2C_SDA8_PORT GPIO_PORT_1//would use P0_6 but used by UART #define I2C_SDA8_PIN GPIO_PIN_2