changed I2C to run directly from IRC
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bef51163ce
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251687fe37
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@ -31,21 +31,20 @@ void i2c0_init(void)
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/* enable input on SCL and SDA pins */
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SCU_SFSI2C0 = SCU_I2C0_NOMINAL;
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/* use PLL1 as clock source for APB1 (including I2C0) */
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CGU_BASE_APB1_CLK = (CGU_SRC_PLL1 << CGU_BASE_CLK_SEL_SHIFT);
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/* use IRC as clock source for APB1 (including I2C0) */
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CGU_BASE_APB1_CLK = (CGU_SRC_IRC << CGU_BASE_CLK_SEL_SHIFT);
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/* FIXME assuming we're on IRC at 96 MHz */
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/* FIXME assuming we're on IRC at 12 MHz */
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/* 400 kHz I2C */
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/*
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I2C0_SCLH = 120;
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I2C0_SCLL = 120;
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*/
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I2C0_SCLH = 15;
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I2C0_SCLL = 15;
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/* 100 kHz I2C */
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I2C0_SCLH = 480;
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I2C0_SCLL = 480;
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/* FIXME not sure why this appears to run at about 290 kHz */
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/*
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I2C0_SCLH = 60;
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I2C0_SCLL = 60;
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*/
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/* clear the control bits */
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I2C0_CONCLR = (I2C_CONCLR_AAC | I2C_CONCLR_SIC
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