e547533435
Convert code to use u{8,16,32,64}_t and s{8,16,32,64}_t instead of C99
integer types.
Jira: ZEP-2051
Change-Id: I08c682bfc0b80dfa88de859e90a011bcd2db2762
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <misc/printk.h>
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#include <device.h>
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#include <i2c.h>
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/**
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* @file Sample app using the TI INA219 through I2C.
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*/
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#define I2C_SLV_ADDR 0x40
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/* The calibration value is based on components on
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* Adafruit's breakout board
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* (https://www.adafruit.com/products/904), where
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* the current sensing resistor is 0.1 ohm.
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* This enables measurements up to 32V, 2A.
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*/
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#define CAL_VAL (4096)
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/* With default calibration above,
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* Each current LSB is 100 uA == 0.1 mA == 0.0001 A.
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* Each power LSB is 2000 uW == 2 mW = 0.002W.
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*/
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#define CUR_LSB 100
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#define PWR_LSB 2000
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int read_reg16(struct device *i2c_dev, u8_t reg_addr,
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u8_t *data)
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{
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u8_t wr_addr;
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struct i2c_msg msgs[2];
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/* Register address */
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wr_addr = reg_addr;
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/* Setup I2C messages */
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/* Send the address to read */
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msgs[0].buf = &wr_addr;
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msgs[0].len = 1;
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msgs[0].flags = I2C_MSG_WRITE;
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/* Read from device. RESTART as neededm and STOP after this. */
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msgs[1].buf = data;
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msgs[1].len = 2;
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msgs[1].flags = I2C_MSG_READ | I2C_MSG_RESTART | I2C_MSG_STOP;
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return i2c_transfer(i2c_dev, &msgs[0], 2, I2C_SLV_ADDR);
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}
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int write_reg16(struct device *i2c_dev, u8_t reg_addr,
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u8_t *data)
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{
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u8_t wr_addr;
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struct i2c_msg msgs[2];
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/* Register address */
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wr_addr = reg_addr;
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/* Setup I2C messages */
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/* Send the address to read */
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msgs[0].buf = &wr_addr;
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msgs[0].len = 1;
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msgs[0].flags = I2C_MSG_WRITE;
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/* Read from device. RESTART as neededm and STOP after this. */
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msgs[1].buf = data;
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msgs[1].len = 2;
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msgs[1].flags = I2C_MSG_WRITE | I2C_MSG_STOP;
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return i2c_transfer(i2c_dev, &msgs[0], 2, I2C_SLV_ADDR);
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}
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void main(void)
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{
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struct device *i2c_dev;
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u8_t data[2];
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u32_t shunt_volt, bus_volt, current, power;
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i2c_dev = device_get_binding("I2C_0");
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if (!i2c_dev) {
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printk("I2C: Device not found.\n");
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return;
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}
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/* Configurate the chip using default values */
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data[0] = 0x03;
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data[1] = 0x99;
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write_reg16(i2c_dev, 0x00, data);
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/* Write the calibration value */
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data[0] = (CAL_VAL & 0xFF00) >> 8;
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data[1] = CAL_VAL & 0xFF;
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write_reg16(i2c_dev, 0x05, data);
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/* Read bus voltage */
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read_reg16(i2c_dev, 0x02, data);
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bus_volt = (data[0] << 8) | data[1];
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bus_volt >>= 3; /* 3 LSBs are not data */
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bus_volt *= 4; /* each LSB is 4 mV */
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printk("Bus Voltage: %d mV\n", bus_volt);
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/* Read shunt voltage */
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read_reg16(i2c_dev, 0x01, data);
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shunt_volt = (data[0] << 8) | data[1];
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shunt_volt *= 10; /* to uV since each LSB is 0.01 mV */
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printk("Shunt Voltage: %d uV\n", shunt_volt);
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/* Read current */
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read_reg16(i2c_dev, 0x04, data);
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current = (data[0] << 8) | data[1];
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current *= CUR_LSB;
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printk("Current: %d uA\n", current);
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/* Read power */
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read_reg16(i2c_dev, 0x03, data);
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power = (data[0] << 8) | data[1];
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power *= PWR_LSB;
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printk("Power: %d uW\n", power);
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}
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