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33 results

overview.rst

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  • Forked from card10 / firmware
    Source project has a limited visibility.
    portexpander.c 1.96 KiB
    #include "portexpander.h"
    
    #include "i2c.h"
    
    #include <stdio.h>
    #include <stdint.h>
    #include <string.h>
    #include <stdbool.h>
    
    static bool detected = false;
    static uint8_t output_state;
    
    void portexpander_init(void)
    {
        uint8_t addr = 0x21;
        int ret;
    
        // Enable pull-ups for buttons
        uint8_t command[] = {0x43, 0x68};
        ret = I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
    
        if(ret != 2) {
            printf("portexpander NOT detected\n");
            detected = false;
            return;
        }
        detected = true;
    
        // Set _all_ outputs to open-drain to support the high side p-channel transistors.
        command[0] = 0x4F; command[1] = 0x01;
        I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
    
        // Enable outputs for the transistors, the LED and the LCD reset
        command[0] = 0x03; command[1] = 0x68;
        I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
    
        // Set outputs to high (i.e. open-drain)
        output_state = 0x97;
        command[0] = 0x01; command[1] = output_state;
        I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
    
        // Turn on LEDs
        // TODO: only turn on LEDs if value != 0,0,0 && dim > 0
        command[0] = 0x01; command[1] = 0x90;
        I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
    
    }
    
    uint8_t portexpander_get(void)
    {
        uint8_t addr = 0x21;
        uint8_t command[] = {0x00};
        uint8_t buf = 0xFF;
    
        if(detected) {
            I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 1, 1);
            I2C_MasterRead(MXC_I2C1_BUS0, addr << 1, &buf, 1, 0);
        }
    
        return buf;
    }
    
    bool portexpander_detected(void)
    {
        return detected;
    }
    
    void portexpander_set(uint8_t pin, uint8_t value)
    {
        uint8_t addr = 0x21;
        uint8_t command[2];
    
        if(detected && pin < 8) {
            if(value) {
                output_state |= (1 << pin);
            } else {
                output_state &= ~(1 << pin);
            }
    
            command[0] = 0x01; command[1] = output_state;
            I2C_MasterWrite(MXC_I2C1_BUS0, addr << 1, command, 2, 0);
        }
    }