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changed I2C to run directly from IRC

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This commit is contained in:
Michael Ossmann 2012-06-06 22:05:03 -06:00
parent bef51163ce
commit 251687fe37
1 changed files with 9 additions and 10 deletions
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19
lib/lpc43xx/i2c.c
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@ -31,21 +31,20 @@ void i2c0_init(void)
/* enable input on SCL and SDA pins */ /* enable input on SCL and SDA pins */
SCU_SFSI2C0 = SCU_I2C0_NOMINAL; SCU_SFSI2C0 = SCU_I2C0_NOMINAL;
/* use PLL1 as clock source for APB1 (including I2C0) */ /* use IRC as clock source for APB1 (including I2C0) */
CGU_BASE_APB1_CLK = (CGU_SRC_PLL1 << CGU_BASE_CLK_SEL_SHIFT); CGU_BASE_APB1_CLK = (CGU_SRC_IRC << CGU_BASE_CLK_SEL_SHIFT);
/* FIXME assuming we're on IRC at 96 MHz */ /* FIXME assuming we're on IRC at 12 MHz */
/* 400 kHz I2C */ /* 400 kHz I2C */
/* I2C0_SCLH = 15;
I2C0_SCLH = 120; I2C0_SCLL = 15;
I2C0_SCLL = 120;
*/
/* 100 kHz I2C */ /* 100 kHz I2C */
I2C0_SCLH = 480; /*
I2C0_SCLL = 480; I2C0_SCLH = 60;
/* FIXME not sure why this appears to run at about 290 kHz */ I2C0_SCLL = 60;
*/
/* clear the control bits */ /* clear the control bits */
I2C0_CONCLR = (I2C_CONCLR_AAC | I2C_CONCLR_SIC I2C0_CONCLR = (I2C_CONCLR_AAC | I2C_CONCLR_SIC