* 273 + (295 - 450 * ADC_VALUE / ADC_READ_MAX) / 2
* = -225 * ADC_VALUE / ADC_READ_MAX + 420.5
*/
{"ECTemp", LM4_ADC_SEQ0, -225, ADC_READ_MAX, 420,
LM4_AIN_NONE, 0x0e /* TS0 | IE0 | END0 */, 0, 0},
/*
* The charger current is measured with a 0.005-ohm
* resistor. IBAT is 20X the voltage across that resistor when
* charging, and either 8X or 16X (default) when discharging, if it's
* even enabled (default is not). Nothing looks at this except the
* console command, so let's just leave it at unity gain. The ADC
* returns 0x000-0xFFF for 0.0-3.3V. You do the math.
*/
{"ChargerCurrent", LM4_ADC_SEQ1, 1, 1, 0,
LM4_AIN(11), 0x06 /* IE0 | END0 */, LM4_GPIO_B, (1<<5)},
/*
* TODO(crosbug.com/p/23827): We don't know what to expect here, but
* it's an analog input that's pulled high. We're using it as a battery
* presence indicator for now. We'll return just 0 - ADC_READ_MAX for
* now.
*/
{"BatteryTemp", LM4_ADC_SEQ2, 1, 1, 0,
LM4_AIN(10), 0x06 /* IE0 | END0 */, LM4_GPIO_B, (1<<4)},
};
BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
/* PWM channels. Must be in the exactly same order as in enum pwm_channel. */
const struct pwm_t pwm_channels[] = {
{4, 0},
const struct adc_t adc_channels[] = {
/* EC internal temperature is calculated by
* 273 + (295 - 450 * ADC_VALUE / ADC_READ_MAX) / 2
* = -225 * ADC_VALUE / ADC_READ_MAX + 420.5
*/
{"ECTemp", LM4_ADC_SEQ0, -225, ADC_READ_MAX, 420,
LM4_AIN_NONE, 0x0e /* TS0 | IE0 | END0 */, 0, 0},
/* IOUT == ICMNT is on PE3/AIN0 */
/* We have 0.01-ohm resistors, and IOUT is 40X the differential
* voltage, so 1000mA ==> 400mV.
* ADC returns 0x000-0xFFF, which maps to 0.0-3.3V (as configured).
* mA = 1000 * ADC_VALUE / ADC_READ_MAX * 3300 / 400
*/
{"ChargerCurrent", LM4_ADC_SEQ1, 33000, ADC_READ_MAX * 4, 0,
LM4_AIN(0), 0x06 /* IE0 | END0 */, LM4_GPIO_E, (1<<3)},
};
BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
/* PWM channels. Must be in the exactly same order as in enum pwm_channel. */
const struct pwm_t pwm_channels[] = {
{4, PWM_CONFIG_ACTIVE_LOW},
{3, PWM_CONFIG_ACTIVE_LOW},
{0, PWM_CONFIG_ACTIVE_LOW},
};
BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
/* I2C ports */
const struct i2c_port_t i2c_ports[] = {
{"batt_chg", 0, 100},
