specchioriflesso/USB_Host_Shield_2.0
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Adds UHS2_GPIO class providing simple access to GPIO ports.

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riban 2018-10-14 12:59:39 +01:00
parent f142f80a30
commit 401f4991e9
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74
UHS2_gpio.cpp Normal file
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/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact information
-------------------
Circuits At Home, LTD
Web : http://www.circuitsathome.com
e-mail : support@circuitsathome.com
UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton brian@riban.co.uk
*/
#include "UHS2_gpio.h"
/** @brief Implement an instance of a UHS2_GPIO object
* @param pUSB Pointer to a UHS2 USB object
*/
UHS2_GPIO::UHS2_GPIO(USB *pUsb) : m_pUsb(pUsb)
{
}
/** @brief Set a GPIO output value
* @param pin GPIO output pin on USB Host Shield to set
* @param val Value to set the pin to (zero value will clear output, non-zero value will assert output)
*/
void UHS2_GPIO::digitalWrite(uint8_t pin, uint8_t val) {
if(pin > 7)
return;
uint8_t nValue = m_pUsb->gpioRdOutput();
uint8_t nMask = 1 << pin;
nValue &= (~nMask);
if(val)
nValue |= (nMask);
m_pUsb->gpioWr(nValue);
}
/** @brief Read the value from a GPIO input pin
* @param pin GPIO input pin on USB Host Shield to read
* @retval int Value of GPIO input (-1 on fail)
*/
int UHS2_GPIO::digitalRead(uint8_t pin) {
if(pin > 7)
return -1;
uint8_t nMask = 1 << pin;
uint8_t nValue = m_pUsb->gpioRd();
return ((nValue & nMask)?1:0);
}
/** @brief Read the value from a GPIO output pin
* @param pin GPIO output pin on USB Host Shield to read
* @retval int Value of GPIO output (-1 on fail)
* @note Value of MAX3421E output register, i.e. what the device has been set to, not the physical value on the pin
*/
int UHS2_GPIO::digitalReadOutput(uint8_t pin) {
if(pin > 7)
return -1;
uint8_t nMask = 1 << pin;
uint8_t nValue = m_pUsb->gpioRdOutput();
return ((nValue & nMask)?1:0);
}

45
UHS2_gpio.h Normal file
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/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact information
-------------------
Circuits At Home, LTD
Web : http://www.circuitsathome.com
e-mail : support@circuitsathome.com
UHS2_GPIO implements "wiring" style GPIO access. Implemented by Brian Walton brian@riban.co.uk
*/
#if !defined(__USB2_GPIO_H__)
#define __USB2_GPIO_H__
#include "Usb.h"
class UHS2_GPIO
{
public:
UHS2_GPIO(USB *pUsb);
void digitalWrite(uint8_t pin, uint8_t val);
int digitalRead(uint8_t pin);
int digitalReadOutput(uint8_t pin);
private:
USB* m_pUsb;
};
#endif // __USB2_GPIO_H__

40
examples/GPIO/Blink/Blink.ino Normal file
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/* Example of reading and writing USB Host Shield GPI output
This example uses "Wiring" style interface. See Blink_LowLevel for example of using low-level UHS interface
Author: Brian Walton (brian@riban.co.uk)
*/
#include <UHS2_gpio.h>
// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#define OUTPUT_PIN 0
USB Usb; //Create an UHS2 interface object
UHS2_GPIO GPIO(&Usb); //Create a GPIO object
void setup()
{
Serial.begin( 115200 );
#if !defined(__MIPSEL__)
while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
Serial.println("Start");
if (Usb.Init() == -1)
Serial.println("OSC did not start.");
delay( 200 );
}
void loop()
{
//Get the current output value, toggle then wait half a second
int nValue = GPIO.digitalReadOutput(OUTPUT_PIN);
nValue = (nValue?0:1);
GPIO.digitalWrite(OUTPUT_PIN, nValue);
Serial.print(nValue?"+":"."); //Debug to show what the output should be doing
delay(500);
}

40
examples/GPIO/Blink_LowLevel/Blink_LowLevel.ino Normal file
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/* Example of reading and writing USB Host Shield GPI output using low-level functions
This example uses low-level UHS interface. See Blink for example of using "Wiring" style interface
Author: Brian Walton (brian@riban.co.uk)
*/
#include <Usb.h>
// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#include <SPI.h>
USB Usb;
void setup()
{
Serial.begin( 115200 );
#if !defined(__MIPSEL__)
while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
Serial.println("Start");
if (Usb.Init() == -1)
Serial.println("OSC did not start.");
delay( 200 );
}
void loop()
{
//Get the current output value, toggle then wait half a second
uint8_t nGPO = Usb.gpioRdOutput();
uint8_t nValue = ((nGPO & 0x01) == 0x01)?0:1;
nGPO &= 0xFE; //clear bit 0
nGPO |= nValue;
Usb.gpioWr(nGPO);
Serial.print(nValue?"+":"."); //Debug to show what the output should be doing
delay(500);
}

38
examples/GPIO/Input/Input.ino Normal file
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/* Example of reading USB Host Shield GPI input
Author: Brian Walton (brian@riban.co.uk)
*/
#include <UHS2_gpio.h>
// Satisfy the IDE, which needs to see the include statment in the ino too.
#ifdef dobogusinclude
#include <spi4teensy3.h>
#endif
#define INPUT_PIN 0
#define OUTPUT_PIN 0
USB Usb; //Create an UHS2 interface object
UHS2_GPIO GPIO(&Usb); //Create a GPIO object
void setup()
{
Serial.begin( 115200 );
#if !defined(__MIPSEL__)
while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
#endif
Serial.println("Start");
if (Usb.Init() == -1)
Serial.println("OSC did not start.");
delay( 200 );
}
void loop()
{
//Get the value of input, set value of output
int nValue = GPIO.digitalRead(INPUT_PIN);
nValue = (nValue?0:1);
GPIO.digitalWrite(OUTPUT_PIN, nValue);
}