Sean Burford / i2c_pullup

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Dependencies:   max32625pico maxim-dev mbed-rtos USBDevice

Fork of PICO_USB_I2C_SPI by Greg Steiert

main.cpp

Committer:
seanburford
Date:
2017-11-24
Revision:
16:847788f907eb
Parent:
15:9801f08ce0ee
Child:
17:43cc59f768af

File content as of revision 16:847788f907eb:

#include "mbed.h"
#include "rtos.h"

#include "gpio_api.h"
#include "max32625pico.h"
#include "pwrman_regs.h"

static DigitalOut rLED(LED1);
static DigitalOut gLED(LED2);
static DigitalOut bLED(LED3);

int gpioAlternatePullup(PinName name) {
    // Enable high resistance pullups per AN6350 section 5.2.4.1
    int result = E_NO_ERROR;
    unsigned int port = PINNAME_TO_PORT(name);
    unsigned int pin = PINNAME_TO_PIN(name);
    MXC_IOMAN->wud_req0 |= ((1 << pin) << (port << 3));  // pinmask
    if (MXC_IOMAN->wud_ack0 != MXC_IOMAN->wud_req0) {
        result = E_BUSY;
    }
    if (result == E_NO_ERROR) {
        MXC_PWRMAN->wud_ctrl = MXC_F_PWRMAN_WUD_CTRL_CTRL_ENABLE;
        MXC_PWRMAN->wud_ctrl |= (port * 8) + pin;  // Pad select
        MXC_PWRMAN->wud_ctrl &= ~(MXC_F_PWRMAN_WUD_CTRL_PAD_MODE);
        MXC_PWRMAN->wud_ctrl |= (MXC_E_PWRMAN_PAD_MODE_WEAK_HI_LO <<
                                 MXC_F_PWRMAN_WUD_CTRL_PAD_MODE_POS);
        MXC_PWRMAN->wud_pulse0 = 1;
    }
    MXC_PWRMAN->wud_ctrl = 0;
    MXC_IOMAN->wud_req0 = 0;
    return result;
}

int main()
{
    rLED = LED_ON;
    gLED = LED_ON;
    bLED = LED_OFF;

    MAX32625PICO pico(
        MAX32625PICO::IOH_3V3, MAX32625PICO::VIO_IOH, MAX32625PICO::VIO_IOH);

    gpioAlternatePullup(P1_6);
    gpioAlternatePullup(P1_7);

    I2C i2c(P1_6, P1_7);
    i2c.frequency(100000);

    rLED = LED_OFF;
    gLED = LED_OFF;

    char dbuf[32];
    while(1) {
        Thread::wait(15);
        if (i2c.read(0x55, dbuf, 8) == 0) {
            gLED = !gLED;
        } else {
            rLED = !rLED;
        }
    }
}