Posted on May 17, 2011 at 12:40hello
I have a question I2C Library(stm32f10x_i2c.c)
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
/* Configure speed in standard mode */
if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
{
......
/* Set Maximum Rise Time: ((1000/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = freqrange + 1;
}
/* Configure speed in fast mode */
else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
{
/* Set Maximum Rise Time: ((300/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = (u16)(((freqrange * 300) / 1000) + 1);
}
....
}//end func
Plz, look commet.
'' Set Maximum Rise Time: ((1000/(1000000000/pclk1clock))+1 ''
--- <- How compute this number(1000ns)?
''Set Maximum Rise Time: ((300/(1000000000/pclk1clock))+1 ''
--- <- How compute this number(300ns)?
plz answer my question.
p.s. : Have a good time~
