Built-in Functions
Returns:
Function:
None
This function can only be used in an RTOS task. This function stops the execution
of the current task and returns control of the processor to rtos_run(). When the
next task executes, it will start it's execution on
the line of code after the rtos_yield().
Availability: All devices
Requires:
#USE RTOS
Examples: void yield(void)
{
printf(“Yielding... \r n”);
rtos_yield();
printf(“Executing code after yield \r n”);
}
Also See:
None
set_adc_channel( )
Syntax:
set_adc_channel ( chan [, neg ]))
Parameters: chan is the channel number to select. Channel numbers start at 0 and are labeled
in the data sheet AN0, AN1. For devices with a differential ADC it sets the positive
channel to use.
neg is optional and is used for devices with a differential ADC only. It sets the
negative channel to use, channel numbers can be 0 to 6 or VSS. If no parameter is
used the negative channel will be set to VSS by default.
Returns:
Function:
undefined
Specifies the channel to use for the next read_adc() call. Be aware that you must
wait a short time after changing the channel before you can get a valid read. The
time varies depending on the impedance of the input source. In general 10us is
good for most applications. You need not change the channel before every read if
the channel does not change.
Availability: This function is only available on devices with A/D hardware.
Requires:
Examples:
Nothing
set_adc_channel(2);
delay_us(10);
value = read_adc();
249
相关PDF资料
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