cy8c95xxa_drv.h

/*
 * cy8c95xxa_drv.h
 *
 *  Created on: 28.02.2016
 *      Author: Andreas Terstegge
 */
 
/*******************************************************
      CY8C9520A / CY8C9540A / CY8C9560A
      20-, 40- 60-Bit I/O Expander with EEPROM
 
 This is a driver for the CY8C95xxA GPIO expander, which
 has 3 to 8 8-bit ports (0...7), and is accessed via the I2C
 interface.
 
 Pin numbers are calculated with:
           pin =   pin_in_port(0...7) + port(0...7) * 8
 
 Note that not all pins on Port 1 and 2 are available
 (depens on the chip addressing)!
 
 02.05.2015  initial version
 
 (c) 2015 A. Terstegge
 
 ********************************************************/
 
#ifndef _CY8C95XXA_DRV_H_
#define _CY8C95XXA_DRV_H_
 
#include "gpio_interface.h"
#include "i2c_interface.h"
 
namespace CY8C95XXA {
 
enum pwm_clk  {
    CLK_32KHZ        = 0x00, CLK_24MHZ    = 0x01,
    CLK_1_5MHZ       = 0x02, CLK_93_75KHZ = 0x03,
    CLK_93_75KHZ_DIV = 0x04, CLK_PRE_PWM  = 0x05 };
 
enum gpio_cmd {
    CMD_STORE_CONFIG = 0x01,
    CMD_RESTORE_FD   = 0x02,
    CMD_RESET        = 0x07 };
 
enum gpio_en  {
    ENABLE_RO        = 0x04,
    ENABLE_EEPROM    = 0x02,
    ENABLE_WD_PIN    = 0x01 };
 
}
 
class cy8c95xxa_drv {
 
public:
    // User interface
    cy8c95xxa_drv(i2c_interface & hw, uint8_t addr);
 
    /* Basic GPIO handling */
    void gpioMode  (uint16_t gpio, uint16_t mode);
    bool gpioRead  (uint16_t gpio);
    void gpioWrite (uint16_t gpio, bool value);
    void gpioToggle(uint16_t gpio);
 
    /* Interrupt handling */
    void gpioAttachIrq (uint16_t gpio,
                        uint16_t mode,
                        function<void()> handler);
    void gpioDetachIrq (uint16_t gpio);
    void gpioEnableIrq (uint16_t gpio);
    void gpioDisableIrq(uint16_t gpio);
    void handleInterrupt();
 
    // PWM stuff
    bool configPWM (uint8_t port,  uint8_t pin, CY8C95XXA::pwm_clk clk,
                    uint8_t period,uint8_t width);
    void setDivider(uint8_t div);
    void enablePWM (uint16_t gpio);
    void disablePWM(uint16_t gpio);
 
    // Config
    void sendCommand (CY8C95XXA::gpio_cmd cmd);
    void setEnableReg(CY8C95XXA::gpio_en  en);
 
    virtual ~cy8c95xxa_drv() { }
 
private:
    // Reference to HW interface
    i2c_interface & _i2c;
    // Storage for current output state
    uint8_t _output[8];
    // I2C addr
    uint8_t _i2c_addr;
    // mask for pwm channels
    uint8_t _pwm_mask;
 
    // interrupt handler functions
    function<void()> intHandler[8][8];
    uint16_t intMode[8][8];
 
    // Register access
    uint8_t readRegister (uint8_t reg);
    bool    writeRegister(uint8_t reg, uint8_t value,
                          uint8_t mask = 0xff);
 
};
 
#endif // _CY8C95XXA_DRV_H_