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tweak twi init

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This commit is contained in:
Olaf Rempel 2008-02-19 20:05:01 +01:00
parent 4e0f66eb01
commit 0302d9bdb0
1 changed files with 30 additions and 26 deletions
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10
src/at91_twi.c
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@ -235,13 +235,17 @@ void at91_twi_init(void)
/* SDA & SCL from Peripheral A, Open Drain, no Pullup */
AT91S_PIO *pio = AT91C_BASE_PIOA;
pio->PIO_ASR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_PDR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
/* do a software reset (bus not connected) */
*AT91C_TWI_CR = AT91C_TWI_SWRST;
pio->PIO_MDER = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_PPUDR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_ASR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
pio->PIO_PDR = AT91C_PA3_TWD | AT91C_PA4_TWCK;
/* set TWI Clock */
*AT91C_TWI_CWGR = TWI_CLK(200000) | (5<<16);
*AT91C_TWI_CWGR = TWI_CLK(400000); //| (5<<16);
/* disable all (known) interrupts */
*AT91C_TWI_IDR = AT91C_TWI_TXCOMP | AT91C_TWI_RXRDY | AT91C_TWI_TXRDY | AT91C_TWI_NACK;