Commit d1aa8db5 authored by Ben Z Yuan's avatar Ben Z Yuan

firmware_v2 speed improvements

* Run the XMEGA at 48 MHz
* Read only 2 bytes instead of 4
* Other attempts at improving speed
parent f6f2e8f3
......@@ -129,6 +129,7 @@ int main(void)
CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
USB_USBTask();
doUSBTask = false;
PORTC.OUT ^= (1 << 0);
}
}
......@@ -169,29 +170,27 @@ void ADC_Init()
static uint8_t spi_rx_buf[4];
inline uint16_t ADC_Read(void)
__attribute__((always_inline)) inline void ADC_Read(uint8_t * dest)
{
while(!(PORTC.IN &= (1 << ADC_RVSPIN)));
PORTC.OUT &= ~(1 << 4);
spi_rx_buf[3] = SPI_ReceiveByte(&SPIC);
spi_rx_buf[2] = SPI_ReceiveByte(&SPIC);
spi_rx_buf[1] = SPI_ReceiveByte(&SPIC);
spi_rx_buf[0] = SPI_ReceiveByte(&SPIC);
*(dest + 1) = SPI_ReceiveByte(&SPIC);
*dest = SPI_ReceiveByte(&SPIC);
//spi_rx_buf[1] = SPI_ReceiveByte(&SPIC);
//spi_rx_buf[0] = SPI_ReceiveByte(&SPIC);
PORTC.OUT |= (1 << 4);
//return (uint32_t) *(uint32_t*)spi_rx_buf;
return (uint16_t) ((*(uint16_t*)(spi_rx_buf+2)) >> 4) ;
}
void ADC_Read_Block(void)
{
TCC0.INTCTRLA = TC_OVFINTLVL_OFF_gc;
PORTC.OUT &= ~(1 << 0);
for(int i = 0; i < ADC_BUFSZ; i++)
// PORTC.OUT &= ~(1 << 0);
for(uint8_t * p = (uint8_t*)adc_buf; p < (uint8_t*)(adc_buf + ADC_BUFSZ); p += 2)
{
adc_buf[i] = ADC_Read();
ADC_Read(p);
}
PORTC.OUT |= (1 << 0);
// PORTC.OUT |= (1 << 0);
TCC0.INTCTRLA = TC_OVFINTLVL_LO_gc;
}
......@@ -227,7 +226,7 @@ void SetupHardware(void)
/* set up 25ms USB interrupt */
TCC0.CTRLA = TC_CLKSEL_DIV256_gc;
TCC0.PER = 3125;
TCC0.PER = F_CPU / 256 / 40;
TCC0.INTCTRLA = TC_OVFINTLVL_LO_gc;
TCC0.INTFLAGS = 0x01;
TCC0.CTRLB = TC_WGMODE_NORMAL_gc;
......
......@@ -53,7 +53,7 @@
uint8_t ReadSignatureByte(uint16_t);
void ADC_Init(void);
uint16_t ADC_Read(void);
void ADC_Read(uint8_t * dest);
void ADC_Read_Block(void);
void SetupHardware(void);
......
......@@ -14,9 +14,9 @@
MCU = atxmega16a4u
ARCH = XMEGA
BOARD = USBKEY
F_CPU = 32000000
F_CPU = 48000000
F_USB = 48000000
OPTIMIZATION = s
OPTIMIZATION = 3
TARGET = main
SRC = $(TARGET).c Descriptors.c $(LUFA_SRC_USB) $(LUFA_SRC_USBCLASS)
LUFA_PATH = /home/atomicinf/src/lufa-LUFA-170418/LUFA
......
......@@ -46,6 +46,7 @@ def idle(parent, canvas):
continue
buf = np.frombuffer(tmp, dtype=np.uint16, count=512)
buf = buf >> 4
break
ax.clear()
......
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