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SAMA5D4-EK: NSH configuration now has TWI0 enabled and supports the I2C tool

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This commit is contained in:
Gregory Nutt 2014-07-02 13:51:57 -06:00
parent a420171a4a
commit 30fc821bc8
2 changed files with 11 additions and 1 deletions
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1
arch/arm/src/sama5/chip/sam_pmc.h
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@ -420,6 +420,7 @@
#define PMC_PCR_CMD (1 << 12) /* Bit 12: Command */
#ifdef ATSAMA5D3
# define SAMA5_HAVE_PMC_PCR 1 /* Supports conditional compilation */
# define PMC_PCR_DIV_SHIFT (16) /* Bits 16-17: Divisor Value */
# define PMC_PCR_DIV_MASK (3 << PMC_PCR_DIV_SHIFT)
# define PMC_PCR_DIV1 (0 << PMC_PCR_DIV_SHIFT) /* Peripheral clock is MCK */

11
arch/arm/src/sama5/sam_twi.c
View File

@ -1167,8 +1167,9 @@ static void twi_hw_initialize(struct twi_dev_s *priv, unsigned int pid,
/* Determine the maximum valid frequency setting */
mck = BOARD_MCK_FREQUENCY;
DEBUGASSERT((mck >> 3) <= TWI_MAX_FREQUENCY);
#ifdef SAMA5_HAVE_PMC_PCR_DIV
DEBUGASSERT((mck >> 3) <= TWI_MAX_FREQUENCY);
if (mck <= TWI_MAX_FREQUENCY)
{
priv->frequency = mck;
@ -1190,6 +1191,14 @@ static void twi_hw_initialize(struct twi_dev_s *priv, unsigned int pid,
regval = PMC_PCR_DIV8;
}
#else
/* No DIV field in the PCR register */
priv->frequency = mck;
regval = 0;
#endif /* SAMA5_HAVE_PMC_PCR_DIV */
/* Set the TWI peripheral input clock to the maximum, valid frequency */
regval |= PMC_PCR_PID(pid) | PMC_PCR_CMD | PMC_PCR_EN;