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atusb/fw2: further abstract board functions
- atusb.c (main), board.h (board_init), board.c (board_init): moved clock and I/O initialization to board file - board.h (led), board.c (led), atusb.c (main): abstracted LED setting in function "led" instead of open-coding it - spi.c (spi_init): set nSS to 1 before enabling the output, so that we don't generate what looks like an empty SPI transaction
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@ -14,26 +14,15 @@
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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); /* resets the transceiver */
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OUT(SLP_TR);
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board_init();
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spi_init();
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reset_rf();
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/* now we should be at 8 MHz */
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SET(LED);
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led(1);
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_delay_ms(100);
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CLR(LED);
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led(0);
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usb_init();
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ep0_init();
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@ -51,3 +51,27 @@ uint8_t read_irq(void)
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{
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return PIN(IRQ_RF);
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}
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void led(int on)
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{
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if (on)
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SET(LED);
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else
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CLR(LED);
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}
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void board_init(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); /* resets the transceiver */
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OUT(SLP_TR);
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}
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@ -44,5 +44,7 @@
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void reset_rf(void);
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uint8_t read_irq(void);
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void led(int on);
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void board_init(void);
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#endif /* !BOARD_H */
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@ -30,6 +30,7 @@ void spi_end(void)
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void spi_init(void)
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{
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SET(nSS);
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OUT(SCLK);
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OUT(MOSI);
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OUT(nSS);
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