pmic.c

#include "i2c.h"
#include "pmic.h"
#include "lp.h"
#include "MAX77650-Arduino-Library.h"
#include <stdint.h>
#include <stdio.h>
#include <errno.h>

static const gpio_cfg_t pmic_interrupt_pin = {
	PORT_0, PIN_12, GPIO_FUNC_IN, GPIO_PAD_PULL_UP
};
static pmic_button_callback_fn pmic_button_callback = NULL;
static volatile bool interrupt_pending;

void pmic_init(void)
{
	uint8_t didm      = MAX77650_getDIDM();
	uint8_t cid       = MAX77650_getChipID();
	interrupt_pending = false;

	printf("MAX7765x DIDM: 0x%02x CID: 0x%02x\n", didm, cid);

	MAX77650_setIP_SBB0(
		0b11); //Limit switch current of SBB0 to 500mA for noise reduction
	//MAX77650_setIP_SBB0(0b00);  //Limit switch current of SBB0 to 1000 mA
	MAX77650_setTV_SBB0(0b101000); //Set output Voltage of SBB0 to 1.8V
	MAX77650_setADE_SBB0(0b0);     //Disable Active Discharge at SBB0 Output
	MAX77650_setEN_SBB0(
		0b110); //Enable SBB0 is on irrespective of FPS whenever the on/off controller is in its "On via Software" or "On via On/Off Controller" states

	//MAX77650_setIP_SBB1(0b11);  //Limit output of SBB1 to 500mA
#if BOARD_EVKIT
	MAX77650_setTV_SBB1(0b100000); //Set output Voltage of SBB1 to 1.2V
#else
	MAX77650_setTV_SBB1(0b001001); //Set output Voltage of SBB1 to 3.3V
#endif
	MAX77650_setADE_SBB1(0b0); //Disable Active Discharge at SBB1 Output
	MAX77650_setEN_SBB1(
		0b110); //Enable SBB1 is on irrespective of FPS whenever the on/off controller is in its "On via Software" or "On via On/Off Controller" states

	MAX77650_setIP_SBB2(
		0b11); //Limit switch current of SBB2 to 500mA for noise reduction
#if BOARD_EVKIT
	MAX77650_setTV_SBB2(0b110010); //Set output Voltage of SBB2 to 3.3V
#else
	//MAX77650_setTV_SBB2(0b110100); //Set output Voltage of SBB2 to 5.0V
	MAX77650_setTV_SBB2(0b010010); //Set output Voltage of SBB2 to 3.3V
#endif
	MAX77650_setADE_SBB2(0b1); //Enable Active Discharge at SBB2 Output
	MAX77650_setEN_SBB2(
		0b110); //Enable SBB2 is on irrespective of FPS whenever the on/off controller is in its "On via Software" or "On via On/Off Controller" states

	// Prepare the PMIC LEDs
	MAX77650_setLED_FS0(0b11);
	MAX77650_setINV_LED0(false);   //LED red: phase operation
	MAX77650_setBRT_LED0(0b00000); //LED red: brightness
	MAX77650_setP_LED0(0b1111);    //LED red: LED period
	MAX77650_setD_LED0(0b1111);    //LED red: LED duty-cycle

	MAX77650_setLED_FS1(0b11);
	MAX77650_setINV_LED1(false);   //LED green: phase operation
	MAX77650_setBRT_LED1(0b00000); //LED green: brightness
	MAX77650_setP_LED1(0b1111);    //LED green: LED period
	MAX77650_setD_LED1(0b1111);    //LED green: LED duty-cycle

	MAX77650_setLED_FS2(0b11);
	MAX77650_setINV_LED2(false);   //LED blue: phase operation
	MAX77650_setBRT_LED2(0b00000); //LED blue: brightness
	MAX77650_setP_LED2(0b1111);    //LED blue: LED period
	MAX77650_setD_LED2(0b1111);    //LED blue: LED duty-cycle

	MAX77650_setEN_LED_MSTR(true); //LEDs Master enable

	MAX77650_setCHG_CV(0b11000); // 4.2 V target battery voltage
	MAX77650_setICHGIN_LIM(1);   // 190 mA limit on USB
	MAX77650_setCHG_CC(0b1011);  // 90 mA fast charge current
	MAX77650_setCHG_EN(1);       // Turn on charger

	MAX77650_setVSYS_REG(
		0b11000); // Set VSYS to 4.7 V to reduce voltage across bypass diode

	/* Setup interrupt & callback */
	GPIO_Config(&pmic_interrupt_pin);
	GPIO_RegisterCallback(
		&pmic_interrupt_pin, pmic_interrupt_callback, NULL
	);
	GPIO_IntConfig(&pmic_interrupt_pin, GPIO_INT_EDGE, GPIO_INT_FALLING);
	GPIO_IntEnable(&pmic_interrupt_pin);
	NVIC_SetPriority(
		(IRQn_Type)MXC_GPIO_GET_IRQ(pmic_interrupt_pin.port), 2
	);
	NVIC_EnableIRQ((IRQn_Type)MXC_GPIO_GET_IRQ(pmic_interrupt_pin.port));

	/* Allow the PMIC to interrupt us in deepsleep */
	LP_EnableGPIOWakeup((gpio_cfg_t *)&pmic_interrupt_pin);
	/* Setup power button interrupt */
	MAX77650_setINT_M_GLBL(~(MAX77650_INT_nEN_R | MAX77650_INT_nEN_F));
	/* Clear existing interrupts */
	MAX77650_getINT_GLBL();
}

__attribute__((weak)) void pmic_interrupt_callback(void *_)
{
	interrupt_pending = true;
}

void pmic_poll(void)
{
	if (interrupt_pending) {
		/* There might be a race condition here. Don't care ATM. */
		interrupt_pending = false;
		uint8_t int_flag  = MAX77650_getINT_GLBL();

		if (int_flag & (MAX77650_INT_nEN_R | MAX77650_INT_nEN_F)) {
			if (pmic_button_callback != NULL) {
				(*pmic_button_callback)(
					int_flag & MAX77650_INT_nEN_F
				);
			}
		}
		/* TODO: Other pmic interrupts */
	}
}

void pmic_set_button_callback(pmic_button_callback_fn cb)
{
	pmic_button_callback = cb;
}

int pmic_get_led(uint8_t led)
{
	if (led == 0) {
		return MAX77650_getBRT_LED0();
	}
	if (led == 1) {
		return MAX77650_getBRT_LED1();
	}
	if (led == 2) {
		return MAX77650_getBRT_LED2();
	}
	return -EINVAL;
}

void pmic_set_led(uint8_t led, uint8_t val)
{
	if (led == 0) {
		MAX77650_setLED_FS0(val > 0 ? 0b01 : 0);
		MAX77650_setBRT_LED0(val);
	}
	if (led == 1) {
		MAX77650_setLED_FS1(val > 0 ? 0b01 : 0);
		MAX77650_setBRT_LED1(val);
	}
	if (led == 2) {
		MAX77650_setLED_FS2(val > 0 ? 0b01 : 0);
		MAX77650_setBRT_LED2(val);
	}
}