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Enhance the HotmailNotifier project so that the LEDs' individual brightness can be controlled individually via software PWM.

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This commit is contained in:
Dean Camera 2009-12-18 04:40:15 +00:00
parent 2cab8f0725
commit 3d6508c9b9
6 changed files with 125 additions and 26 deletions
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64
Projects/HotmailNotifier/HotmailNotifier.c
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@ -60,6 +60,39 @@ USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
},
};
/** Counter for the software PWM */
static volatile uint8_t SoftPWM_Count;
/** Duty cycle for the first software PWM channel */
static volatile uint8_t SoftPWM_Channel1_Duty;
/** Duty cycle for the second software PWM channel */
static volatile uint8_t SoftPWM_Channel2_Duty;
/** Duty cycle for the third software PWM channel */
static volatile uint8_t SoftPWM_Channel3_Duty;
/** Interrupt handler for managing the software PWM channels for the LEDs */
ISR(TIMER0_COMPA_vect, ISR_BLOCK)
{
uint8_t LEDMask = LEDS_ALL_LEDS;
if (++SoftPWM_Count == 0x1F)
SoftPWM_Count = 0;
if (SoftPWM_Count >= SoftPWM_Channel1_Duty)
LEDMask &= ~LEDS_LED1;
if (SoftPWM_Count >= SoftPWM_Channel2_Duty)
LEDMask &= ~LEDS_LED2;
if (SoftPWM_Count >= SoftPWM_Channel3_Duty)
LEDMask &= ~LEDS_LED3;
LEDs_SetAllLEDs(LEDMask);
}
/** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
* used like any regular character stream in the C APIs
*/
@ -77,11 +110,21 @@ int main(void)
for (;;)
{
/* Read next character - if a '1' turn on red led, if a '0' turn on green LED */
if (fgetc(&USBSerialStream) == '1')
LEDs_SetAllLEDs(LEDS_LED3);
else
LEDs_SetAllLEDs(LEDS_LED2);
/* Read in next LED colour command from the host */
uint8_t ColorUpdate = fgetc(&USBSerialStream);
/* Top 3 bits select the LED, bottom three control the brightness */
uint8_t Channel = (ColorUpdate & 0b11100000);
uint8_t Duty = (ColorUpdate & 0b00011111);
if (Channel & (1 << 5))
SoftPWM_Channel1_Duty = Duty;
if (Channel & (1 << 6))
SoftPWM_Channel2_Duty = Duty;
if (Channel & (1 << 7))
SoftPWM_Channel3_Duty = Duty;
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
@ -101,15 +144,18 @@ void SetupHardware(void)
/* Hardware Initialization */
LEDs_Init();
USB_Init();
/* Timer Initialization */
OCR0A = 100;
TCCR0A = (1 << WGM01);
TCCR0B = (1 << CS00);
TIMSK0 = (1 << OCIE0A);
}
/** Event handler for the library USB Configuration Changed event. */
void EVENT_USB_Device_ConfigurationChanged(void)
{
LEDs_SetAllLEDs(LEDS_ALL_LEDS);
if (!(CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface)))
LEDs_SetAllLEDs(LEDS_LED1 | LEDS_LED3);
CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
}
/** Event handler for the library USB Unhandled Control Request event. */