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git://projects.qi-hardware.com/ben-wpan.git
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259400fdb8
- ./: basic framework to build a firmware that can enumerate - usb/patches/: patches to make FreakUSB 0.7 compile cleanly and to make it work in our context
100 lines
1.7 KiB
C
100 lines
1.7 KiB
C
#include <stdint.h>
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#include <avr/io.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "freakusb.h"
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#include "io.h"
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#include "at86rf230.h"
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static void spi_begin(void)
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{
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CLR(nSS);
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}
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static uint8_t spi(uint8_t v)
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{
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// while (!(UCSR1A & 1 << UDRE1));
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UDR1 = v;
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while (!(UCSR1A & 1 << RXC1));
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return UDR1;
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}
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static void spi_end(void)
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{
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// while (!(UCSR1A & 1 << TXC1));
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SET(nSS);
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}
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int main(void)
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{
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/* We start with a 1 MHz/8 clock. Disable the prescaler. */
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CLKPR = 1 << CLKPCE;
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CLKPR = 0;
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/* set up all the outputs; default port value is 0 */
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OUT(LED);
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OUT(nRST_RF); /* reset the transceiver */
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OUT(SLP_TR);
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OUT(SCLK);
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OUT(MOSI);
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OUT(nSS);
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/* set up UART-SPI */
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UCSR1C = 1 << UMSEL11 | 1 << UMSEL10;
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/* set MSPI, MSB first, SPI data mode 0 */
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UCSR1B = 1 << RXEN1 | 1 << TXEN1;
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/* enable receiver and transmitter */
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UBRR1 = 0; /* reconfirm the bit rate */
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/* bring the transceiver out of reset */
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/*
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* AT86RF231 data sheet, 12.4.13, reset pulse with: 625 ns (min).
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* We spend a lot more time getting here, so no extra wait is needed.
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*/
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SET(nRST_RF);
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/*
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* 12.4.14: SPI access latency after reset: 625 ns
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*/
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_delay_us(1);
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/* switch CLKM to 8 MHz */
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/*
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* @@@ Note: Atmel advise against changing the external clock in
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* mid-flight. We should therefore switch to the RC clock first, then
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* crank up the external clock, and finally switch back to the external
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* clock. The clock switching procedure is described in the ATmega32U2
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* data sheet in secton 8.2.2.
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*/
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spi_begin();
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spi(AT86RF230_REG_WRITE | REG_TRX_CTRL_0);
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spi(CLKM_CTRL_8MHz);
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spi_end();
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/* now we should be at 8 MHz */
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SET(LED);
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_delay_ms(100);
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CLR(LED);
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usb_init();
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hw_init();
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while (1)
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usb_poll();
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}
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