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ChibiOS
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Reformatted some comments going past column 80. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@3726 35acf78f-673a-0410-8e92-d51de3d6d3f4
This commit is contained in:
gdisirio 2012-01-04 10:44:57 +00:00
parent 354a341507
commit c8f12b50c2
1 changed files with 24 additions and 13 deletions
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37
os/hal/platforms/STM32/i2c_lld.c
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@ -132,22 +132,28 @@ static void i2c_lld_set_clock(I2CDriver *i2cp) {
i2cp->i2c->CR2 |= (uint16_t)I2C_CLK_FREQ;
/* CCR Configuration.*/
regCCR = 0; /* Clear F/S, DUTY and CCR[11:0] bits */
regCCR = 0;
clock_div = I2C_CCR_CCR;
if (clock_speed <= 100000) { /* Configure clock_div in standard mode */
if (clock_speed <= 100000) {
/* Configure clock_div in standard mode.*/
chDbgAssert(duty == STD_DUTY_CYCLE,
"i2c_lld_set_clock(), #1",
"Invalid standard mode duty cycle");
clock_div = (uint16_t)(STM32_PCLK1 / (clock_speed * 2)); /* Standard mode clock_div calculate: Tlow/Thigh = 1/1 */
if (clock_div < 0x04) clock_div = 0x04; /* Test if CCR value is under 0x4, and set the minimum allowed value */
regCCR |= (clock_div & I2C_CCR_CCR); /* Set clock_div value for standard mode */
i2cp->i2c->TRISE = I2C_CLK_FREQ + 1; /* Set Maximum Rise Time for standard mode */
}
else if (clock_speed <= 400000) { /* Configure clock_div in fast mode */
/* Standard mode clock_div calculate: Tlow/Thigh = 1/1.*/
clock_div = (uint16_t)(STM32_PCLK1 / (clock_speed * 2));
/* Clock divider values under four are not allowed.*/
if (clock_div < 0x04)
clock_div = 0x04;
regCCR |= (clock_div & I2C_CCR_CCR);
/* Sets the Maximum Rise Time for standard mode.*/
i2cp->i2c->TRISE = I2C_CLK_FREQ + 1;
}
else if (clock_speed <= 400000) {
/* Configure clock_div in fast mode.*/
chDbgAssert((duty == FAST_DUTY_CYCLE_2) || (duty == FAST_DUTY_CYCLE_16_9),
"i2c_lld_set_clock(), #2",
"Invalid fast mode duty cycle");
@ -161,12 +167,17 @@ static void i2c_lld_set_clock(I2CDriver *i2cp) {
clock_div = (uint16_t)(STM32_PCLK1 / (clock_speed * 25));
regCCR |= I2C_CCR_DUTY;
}
if (clock_div < 0x01) clock_div = 0x01; /* Test if CCR value is under 0x1, and set the minimum allowed value */
regCCR |= (I2C_CCR_FS | (clock_div & I2C_CCR_CCR)); /* Set clock_div value and F/S bit for fast mode*/
i2cp->i2c->TRISE = (I2C_CLK_FREQ * 300 / 1000) + 1; /* Set Maximum Rise Time for fast mode */
/* Clock divider values under one are not allowed.*/
if (clock_div < 0x01)
clock_div = 0x01;
regCCR |= (I2C_CCR_FS | (clock_div & I2C_CCR_CCR));
/* Sets the Maximum Rise Time for fast mode.*/
i2cp->i2c->TRISE = (I2C_CLK_FREQ * 300 / 1000) + 1;
}
chDbgAssert((clock_div <= I2C_CCR_CCR),
"i2c_lld_set_clock(), #3", "Too low clock clock speed selected");
"i2c_lld_set_clock(), #3", "the selected clock is too low");
i2cp->i2c->CCR = regCCR;
}