simple I2C question TC74

Question

I have a TC74 temp sensor 
 https://www.microchip.com/wwwproducts/en/TC74 
 and want the temperature 
 using code below I always get a greenlight / EVENTS ERROR 
 thank you in advance for any all help 
 
 int main(void) { short temperature = 0; 
 nrf_gpio_cfg_output(42); //output that needs to be off to power MEMs nrf_gpio_cfg_output(46); //RED nrf_gpio_cfg_output(47); //GREEN nrf_gpio_pin_clear(42); nrf_gpio_pin_set(46);//turns off LED nrf_gpio_pin_set(47);//turns off LED 
 NRF_TWIM0->ENABLE=0;//disable nordic as master NRF_TWIM0->PSEL.SCL=11;//P0.11 NRF_TWIM0->PSEL.SDA=13;//P0.13 NRF_TWIM0->FREQUENCY=0x01980000;//100kHz NRF_TWIM0->ADDRESS=(0b11001000); // 1001 000--> x100 100 | x 1 fpr read 0 for write NRF_TWIM0->RXD.PTR = temperature; //store 1 byte temperature in temperature variable NRF_TWIM0->SHORTS = 0; NRF_TWI0->INTENSET = 0x061C0202; // set interupts NRF_TWIM0->ENABLE=6;//enable nordic as master NRF_TWI0->TASKS_STARTRX = 1; while (1) { if(NRF_TWI0->EVENTS_STOPPED) nrf_gpio_pin_clear(46); if(NRF_TWI0->EVENTS_ERROR) nrf_gpio_pin_clear(47);//Always comes up with an error } }

americanhoney · Accepted Answer

I fixed it. thank you 
 
 //need to declare in global fashion suggest putting in main.c file at top just after includes uint8_t temp_buffer[] = {0x01,0x00,0x00}; //used to READ temperature | STARTRX = 1 | stored in temp_buffer[0] 
 /** * @brief Function for initializing the TC74 */ void InitializeTC74_TemperatureSensor(void) { nrf_gpio_cfg_output(42); //output that needs to be off to power MEMs | P1.10 | MEMS_PWR_CTRL nrf_gpio_pin_clear(42); //PNP transistor so output low to power upp <see print 32341748> nrf_delay_ms(500); //give sensor time to power up 
 uint8_t rx_buffer[]={0x00,0x00}; //used in STARTTX 
 NRF_TWIM0->ENABLE=0;//disable nordic as master to configure NRF_TWIM0->PSEL.SCL=11;//P0.11 NRF_TWIM0->PSEL.SDA=13;//P0.13 NRF_TWIM0->FREQUENCY=0x01980000;//100kHz NRF_TWIM0->ADDRESS=(0x48); // 1001 000--> x100 100 | x 1 fpr read 0 for write |NORDIC takes care of the read/write bit NRF_TWIM0->RXD.PTR=temp_buffer; NRF_TWIM0->RXD.MAXCNT=2; // size of temp_buffer NRF_TWIM0->TXD.PTR=rx_buffer; NRF_TWIM0->TXD.MAXCNT=1;//size of rx_buffer NRF_TWIM0->SHORTS = 0;//disable shortcuts NRF_TWIM0->ENABLE=6;//enable nordic as master 
 //initialze TC74 to take data | normal mode NRF_TWIM0->EVENTS_ERROR=0; NRF_TWIM0->ERRORSRC=0; NRF_TWIM0->EVENTS_STOPPED=0; NRF_TWI0->EVENTS_RXDREADY=0; NRF_TWIM0->TASKS_STARTTX = 1; while(NRF_TWI0->EVENTS_TXDSENT==0){} NRF_TWIM0->TASKS_STOP=1; NRF_TWI0->EVENTS_TXDSENT=0; nrf_delay_ms(100); 
 } 
 /** * @brief Function that returns temperature in degrees Celcius when called */ uint8_t GetTemperature(void) { NRF_TWIM0->TASKS_STARTTX = 0; NRF_TWI0->EVENTS_RXDREADY=0; NRF_TWIM0->TASKS_STARTRX = 1; while(NRF_TWI0->EVENTS_RXDREADY==0){} NRF_TWIM0->TASKS_STOP=1; NRF_TWI0->EVENTS_RXDREADY=0; return temp_buffer[0]; }

simple I2C question TC74

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