Part Number: TM4C129XNCZAD Hi, I am trying to follow the flowchart given in the datasheet to transmit 4 bytes out from I2C. However, I can only manage to see 0x34 and 0x78 being transmitted out from the scope while the other 2 bytes lost in the air. Below is the code and flowchart for reference. Need a second pairs of eyes to see what I have missed in my code. Thanks. My code: int main(void) { //Enable clock to I2C and GPIO Port A *((uint32_t *)(SYSCTL_RCGCI2C)) |= (0x01 << 9); *((uint32_t *)(SYSCTL_RCGCGPIO)) |= (0x00001 << 0); //Wait for the SSI Interface and GPIO Port A Peripheral to be ready while(!(*(uint32_t *)(SYSCTL_PRI2C) & (0x001 << 9))); while(!(*(uint32_t *)(SYSCTL_PRGPIO) & (0x00001 << 0))); //Configure the GPIO alternate function as I2C *((uint32_t *)(GPIO_PORTA_AHB + GPIO_O_AFSEL)) |= (0x03 << 0); *((uint32_t *)(GPIO_PORTA_AHB + GPIO_O_ODR)) |= (0x01 << 1); *((uint32_t *)(GPIO_PORTA_AHB + GPIO_O_PCTL)) = (0x2 << 4 | 0x2 << 0); *((uint32_t *)(GPIO_PORTA_AHB + GPIO_O_DEN)) |= (0x03 << 0); //Configure the clock source to use PIOSC *((uint32_t *)(SYSCTL_PLLFREQ0)) |= (0x1 << 23); while(!(*(uint32_t *)(SYSCTL_PLLSTAT))); *((uint32_t *)(SYSCTL_PLLFREQ0)) &= ~(0x1 << 23); //Configure I2C as master mode *((uint32_t *)(I2C9 + I2C_O_MCR)) |= (0x1 << 4); //Configure SCL clock speed to 100kHz *((uint32_t *)(I2C9 + I2C_O_MTPR)) = 0x08; //Configure the slave address and operate in transmit mode *((uint32_t *)(I2C9 + I2C_O_MSA)) = (0x76 << 1 | 0x0 << 0); //Wait until the bus is idle while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000001); while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000040); //Transmit 1 byte of data *((uint32_t *)(I2C9 + I2C_O_MDR)) = 0x12; //Initiate 1 byte transmission *((uint32_t *)(I2C9 + I2C_O_MCS)) = 0x03; //Wait until the I2C is idle and no error while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000001); while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000002); //Transmit 1 byte of data *((uint32_t *)(I2C9 + I2C_O_MDR)) = 0x34; //Initiate 1 byte transmission *((uint32_t *)(I2C9 + I2C_O_MCS)) = 0x01; //Wait until the I2C is idle and no error while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000001); while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000002); //Transmit 1 byte of data *((uint32_t *)(I2C9 + I2C_O_MDR)) = 0x56; //Initiate 1 byte transmission *((uint32_t *)(I2C9 + I2C_O_MCS)) = 0x01; //Wait until the I2C is idle and no error while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000001); while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000002); //Transmit 1 byte of data *((uint32_t *)(I2C9 + I2C_O_MDR)) = 0x78; //Initiate 1 byte transmission *((uint32_t *)(I2C9 + I2C_O_MCS)) = 0x05; //Wait until the I2C is idle and no error while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000001); while((*(uint32_t *)(I2C9 + I2C_O_MCS)) & 0x00000002); while(1); }
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