diff options
Diffstat (limited to 'usb-spi/usb-spi.c')
| -rw-r--r-- | usb-spi/usb-spi.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/usb-spi/usb-spi.c b/usb-spi/usb-spi.c new file mode 100644 index 0000000..1c000ed --- /dev/null +++ b/usb-spi/usb-spi.c @@ -0,0 +1,199 @@ +/*
+ * spreadspace avr utils
+ *
+ *
+ * Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org>
+ *
+ * This file is part of spreadspace avr utils.
+ *
+ * spreadspace avr utils 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 3 of the License, or
+ * any later version.
+ *
+ * spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+
+#include "util.h"
+#include "led.h"
+
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+#include <LUFA/Version.h>
+#include <LUFA/Drivers/Peripheral/SPI.h>
+#include <LUFA/Drivers/Misc/RingBuffer.h>
+#include <LUFA/Drivers/USB/USB.h>
+#include "lufa-descriptor-usbserial.h"
+
+ /* Global I/O Buffers: */
+static RingBuffer_t USBtoSPI_Buffer;
+static uint8_t USBtoSPI_Buffer_Data[128];
+static RingBuffer_t SPItoUSB_Buffer;
+static uint8_t SPItoUSB_Buffer_Data[128];
+
+/** LUFA CDC Class driver interface configuration and state information. This structure is
+ * passed to all CDC Class driver functions, so that multiple instances of the same class
+ * within a device can be differentiated from one another.
+ */
+USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
+ {
+ .Config =
+ {
+ .ControlInterfaceNumber = 0,
+
+ .DataINEndpointNumber = CDC_TX_EPNUM,
+ .DataINEndpointSize = CDC_TXRX_EPSIZE,
+ .DataINEndpointDoubleBank = false,
+
+ .DataOUTEndpointNumber = CDC_RX_EPNUM,
+ .DataOUTEndpointSize = CDC_TXRX_EPSIZE,
+ .DataOUTEndpointDoubleBank = false,
+
+ .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
+ .NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE,
+ .NotificationEndpointDoubleBank = false,
+ },
+ };
+
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+ CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
+}
+
+void EVENT_USB_Device_ControlRequest(void)
+{
+ CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
+}
+
+/* end LUFA CDC-ACM specific definitions */
+
+ /* Hardware Defines: */
+#define SPI_CS_DDR DDRB
+#define SPI_CS_PORT PORTB
+#define CS 0
+
+#define RESET_DDR DDRB
+#define RESET_PORT PORTB
+#define RESET 7
+
+void SetupHardware(void)
+{
+ MCUSR &= ~(1 << WDRF);
+ wdt_disable();
+
+ cpu_init();
+ led_init();
+ USB_Init();
+
+ TCCR0B = (1 << CS02);
+
+ SPI_Init(SPI_SPEED_FCPU_DIV_16 | SPI_MODE_MASTER | SPI_ORDER_MSB_FIRST |
+ SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING);
+ SPI_CS_DDR |= (1<<CS);
+ SPI_CS_PORT |= (1<<CS);
+
+ RESET_DDR |= (1<<RESET);
+ RESET_PORT |= (1<<RESET);
+
+/* INT0 as input with pull-up */
+ DDRD &= ~(1<<0);
+ PORTD |= (1<<0);
+ EICRA |= (1<<ISC01);
+ EIFR |= (1<<INTF0);
+ EIMSK |= (1<<INT0);
+}
+
+void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
+{
+ if(CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR)
+ RESET_PORT &= ~(1<<RESET);
+ else
+ RESET_PORT |= (1<<RESET);
+}
+
+void EVENT_CDC_Device_BreakSent(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo, const uint8_t Duration)
+{
+ SPI_CS_PORT ^= (1<<CS);
+}
+
+ISR(INT0_vect)
+{
+ SPI_CS_PORT &= ~(1<<CS);
+ led_on();
+
+ uint8_t ReceivedByte = SPI_ReceiveByte();
+ RingBuffer_Insert(&SPItoUSB_Buffer, ReceivedByte);
+
+ led_off();
+ SPI_CS_PORT |= (1<<CS);
+}
+
+void SPI_SendBuffer(void)
+{
+ SPI_CS_PORT &= ~(1<<CS);
+ led_on();
+
+ while(!(RingBuffer_IsEmpty(&USBtoSPI_Buffer))) {
+ SPI_SendByte(RingBuffer_Remove(&USBtoSPI_Buffer));
+ }
+
+ led_off();
+ SPI_CS_PORT |= (1<<CS);
+}
+
+int main(void)
+{
+ SetupHardware();
+
+ RingBuffer_InitBuffer(&USBtoSPI_Buffer, USBtoSPI_Buffer_Data, sizeof(USBtoSPI_Buffer_Data));
+ RingBuffer_InitBuffer(&SPItoUSB_Buffer, SPItoUSB_Buffer_Data, sizeof(SPItoUSB_Buffer_Data));
+
+ sei();
+
+ for (;;) {
+ int16_t BytesReceived = CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface);
+ while(BytesReceived > 0) {
+ if(!(RingBuffer_IsFull(&USBtoSPI_Buffer))) {
+ int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
+ if (!(ReceivedByte < 0))
+ RingBuffer_Insert(&USBtoSPI_Buffer, ReceivedByte);
+
+ BytesReceived--;
+ }
+ }
+
+ uint16_t BufferCount = RingBuffer_GetCount(&SPItoUSB_Buffer);
+ if ((TIFR0 & (1 << TOV0)) || (BufferCount > (uint8_t)(sizeof(SPItoUSB_Buffer_Data) * .75))) {
+ TIFR0 |= (1 << TOV0);
+ while (BufferCount--) {
+ if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
+ RingBuffer_Peek(&SPItoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
+ break;
+
+ RingBuffer_Remove(&SPItoUSB_Buffer);
+ }
+ }
+
+ if (!(RingBuffer_IsEmpty(&USBtoSPI_Buffer)))
+ SPI_SendBuffer();
+
+ CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
+ USB_USBTask();
+ }
+}
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