/* Includes ------------------------------------------------------------------*/
/*
 * libc
 */
#include <stdio.h>

/*
 * LIBOPENCM3
 */
#include <libopencm3/stm32/f4/rcc.h>
#include <libopencm3/stm32/f4/gpio.h>
#include <libopencm3/stm32/f4/i2c_f4.h>
#include <libopencm3/stm32/f4/usart.h>
#include <libopencm3/stm32/nvic.h>
#include <support/versions.h>

#include <otp/defs.h>
#include <i2c/i2clib.h>

#if 0
void delay(unsigned int count) {
	while(count--) {}
}
#endif

int ltc2499Config(uint32_t i2cChannel, u8 address) {
	int iRtn;
	u8 buff[2];

// write config register continuous reading
	buff[0] = 0xb0; // 0xbx x= channel convert config
	buff[1] = 0x88; // convert config
	iRtn = I2C_Write(i2cChannel, I2C_MASTER, buff,  2, address);
	delay (1000000);
	return iRtn;
}

int ltc2499Read(uint32_t i2cChannel, u8 address, u8 dataChannel) {
	int iRtn;
	u8 cmdBuff[2];
	u8 dataBuff[4];
	int val = 0;

	cmdBuff[0] = 0xb0 + dataChannel; // 0xbx single x= channel convert config
	cmdBuff[1] = 0x88; // convert config
	iRtn = I2C_MasterWriteRead(i2cChannel, address, (u8 *) cmdBuff,  2, (u8 *) dataBuff, 4); // start conversion channel dataChannel
	delay (1000000); // wait en of conversion
	if (iRtn == -1)
		return (-1);

	cmdBuff[0] = 0xb0 + dataChannel + 1; // 0xbx x= channel convert config
	cmdBuff[1] = 0x88; // convert config
	iRtn = I2C_MasterWriteRead(i2cChannel, address, (u8 *) cmdBuff,  2, (u8 *) dataBuff, 4);// read channel i start conversion next channel
	delay (1000000); // wait en of conversion
	if (iRtn == -1)
		return (-1);

	val = dataBuff[0] << 24;
	val += dataBuff[1] << 16;
	val += dataBuff[2] << 8;
	val += dataBuff[3];

	return ((int) val);
}

int ltc2499ReadDiff(uint32_t i2cChannel, u8 address, u8 dataChannel) {
	int iRtn;
	u8 cmdBuff[2];
	u8 dataBuff[4];
	int val = 0;

	cmdBuff[0] = 0xa0  + dataChannel; // 0xax diff x= channel convert config
	cmdBuff[1] = 0x88; // convert config
	iRtn = I2C_MasterWriteRead(i2cChannel, address, (u8 *) cmdBuff,  2, (u8 *) dataBuff, 4); // start conversion channel dataChannel
	delay (1000000); // wait en of conversion
	if (iRtn == -1)
		return (-1);

	cmdBuff[0] = 0xa0 + dataChannel + 1; // 0xax x= channel convert config
	cmdBuff[1] = 0x88; // convert config
	iRtn = I2C_MasterWriteRead(i2cChannel, address, (u8 *) cmdBuff,  2, (u8 *) dataBuff, 4);// read channel i start conversion next channel
	delay (1000000); // wait en of conversion
	if (iRtn == -1)
		return (-1);

	val = dataBuff[0] << 24;
	val += dataBuff[1] << 16;
	val += dataBuff[2] << 8;
	val += dataBuff[3];

	return ((int) val);
}