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Added new \ref SPI_GetCurrentMode() function to the SPI peripheral driver.

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This commit is contained in:
Dean Camera 2011-06-16 07:23:37 +00:00
parent d8fe01f19a
commit f10126a95e
2 changed files with 24 additions and 5 deletions
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24
LUFA/Drivers/Peripheral/AVR8/SPI_AVR8.h
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@ -167,16 +167,23 @@
*/
static inline void SPI_Init(const uint8_t SPIOptions)
{
DDRB |= ((1 << 1) | (1 << 2));
DDRB &= ~((1 << 0) | (1 << 3));
PORTB |= ((1 << 0) | (1 << 3));
/* Prevent high rise times on PB.0 (/SS) from forcing a change to SPI slave mode */
DDRB |= (1 << 0);
PORTB |= (1 << 0);
SPCR = ((1 << SPE) | SPIOptions);
DDRB |= ((1 << 1) | (1 << 2));
DDRB &= ~(1 << 3);
PORTB |= (1 << 3);
if (SPIOptions & SPI_USE_DOUBLESPEED)
SPSR |= (1 << SPI2X);
else
SPSR &= ~(1 << SPI2X);
/* Switch /SS to input mode after configuration to allow for forced mode changes */
DDRB &= ~(1 << 0);
SPCR = ((1 << SPE) | SPIOptions);
}
/** Turns off the SPI driver, disabling and returning used hardware to their default configuration. */
@ -188,6 +195,15 @@
SPCR = 0;
SPSR = 0;
}
/** Retrieves the currently selected SPI mode, once the SPI interface has been configured.
*
* \return \ref SPI_MODE_MASTER if the interface is currently in SPI Master mode, \ref SPI_MODE_SLAVE otherwise
*/
static inline uint8_t SPI_GetCurrentMode(void)
{
return (SPCR & SPI_MODE_MASTER);
}
/** Sends and receives a byte through the SPI interface, blocking until the transfer is complete.
*