#include "dac.h"
#include <stdint.h>
#include <stdio.h>
#include "ti/driverlib/dl_i2c.h"
#include "ti_msp_dl_config.h"


//The device updates all DAC analog output(vout) at the same time

void DAC_UpdateOutput() {
    uint8_t general_call_command = 0x08;  // General Call Update Command
    while (DL_I2C_getControllerStatus(I2C_controller_INST) & DL_I2C_CONTROLLER_STATUS_BUSY_BUS);
    DL_I2C_fillControllerTXFIFO(I2C_controller_INST, &general_call_command, 1);

    // Start I2C transaction
    DL_I2C_startControllerTransfer(I2C_controller_INST, 0x00, DL_I2C_CONTROLLER_DIRECTION_TX, 1);
    
    while (DL_I2C_getControllerStatus(I2C_controller_INST) & DL_I2C_CONTROLLER_STATUS_BUSY_BUS);

    printf("DAC Outputs Updated via General Call Software Update!\n");
}

/**Function for FAST write command, sending values over I2c to every channel of DAC**/
bool DAC_fastWrite(uint16_t channel_a_value){

    /*DAC has a 12 bit resolution that ranges from 0 to 4095.
    0x00: sets the Power Mode to NORMAL for Channel A
    (channel_a_value >> 8): shifts the value to 8 places right and gives upper 4 bits
    */

    uint8_t output_buffer[8];

    output_buffer[0]= (0x00)|(channel_a_value >> 8)&0x0F;
    //output_buffer[0] = channel_a_value >> 8;
    output_buffer[1]= channel_a_value & 0xFF;

    output_buffer[2]= 0x40; // Power down for the other channels
    output_buffer[3]= 0x00; 

    output_buffer[4]= 0x40;
    output_buffer[5]= 0x00;

    output_buffer[6]= 0x40;
    output_buffer[7]= 0x00;

    if (DL_I2C_getControllerStatus(I2C_controller_INST) & DL_I2C_CONTROLLER_STATUS_ERROR) {
        printf("I2C Write Error: Failed to write to DAC channels for FAST write mode!\n");
        return false;  // Return failure if there was an error
    }

    // **Wait for I2C Bus to be Free**
    while (DL_I2C_getControllerStatus(I2C_controller_INST) & DL_I2C_CONTROLLER_STATUS_BUSY_BUS);


    

    // **Start I2C Write Transaction**
    DL_I2C_startControllerTransfer(I2C_controller_INST, DAC_TARGET_BASE_ADDRESS, DL_I2C_CONTROLLER_DIRECTION_TX, 8);

    // **Load Configuration Byte into TX FIFO**
    DL_I2C_fillControllerTXFIFO(I2C_controller_INST, (uint8_t*)&output_buffer, 8);


    // **Ensure STOP Condition is Sent**
    while (DL_I2C_getControllerStatus(I2C_controller_INST) & DL_I2C_CONTROLLER_STATUS_BUSY_BUS);
    printf("DAC Fast write Successful!\n");
    DAC_UpdateOutput();
    return true;

}