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Functional Overview
BYTE data;
i 2 c_start();
i 2 c_write(data);
i 2 c_stop();
// Data to be transmitted
// Issues a start command when in the I2C master mode.
// Sends a single byte over the I2C interface.
// Issues a stop command when in the I2C master mode.
ADC
These options let the user configure and use the analog to digital converter module. They are
only available on devices with the ADC hardware. The options for the functions and directives
vary depending on the chip and are listed in the device header file. On some devices there are
two independent ADC modules, for these chips the second module is configured using
secondary ADC setup functions (Ex. setup_ADC2).
Relevant Functions:
setup_adc(mode)
setup_adc_ports(value)
set_adc_channel(channel)
read_adc(mode)
adc_done()
Relevant Preprocessor:
#DEVICE ADC=xx
Sets up the a/d mode like off, the adc clock etc.
Sets the available adc pins to be analog or digital.
Specifies the channel to be use for the a/d call.
Starts the conversion and reads the value. The mode
can also control the functionality.
Returns 1 if the ADC module has finished its conversion.
Configures the read_adc return size. For example, using
a PIC with a 10 bit A/D you can use 8 or 10 for xx- 8 will
return the most significant byte, 10 will return the full A/D
reading of 10 bits.
Relevant Interrupts:
INT_AD
INT_ADOF
Relevant Include Files:
None, all functions built-in
Relevant getenv() parameters:
ADC_CHANNELS
ADC_RESOLUTION
Interrupt fires when a/d conversion is complete
Interrupt fires when a/d conversion has timed out
Number of A/D channels
Number of bits returned by read_adc
Example Code:
#DEVICE ADC=10
...
long value;
31
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