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Added default delay and sample times for the ADC during initialization.

pull/5144/head
Dave Wu 2017-10-12 12:46:54 +11:00
parent 6d116273c7
commit de2b5264e2
1 changed files with 16 additions and 0 deletions
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16
targets/TARGET_Analog_Devices/TARGET_ADUCM4X50/TARGET_ADUCM4050/api/analogin_api.c
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@ -94,6 +94,22 @@ void analogin_init(analogin_t *obj, PinName pin)
MBED_ASSERT(channel != 0xFFFFFFFF);
obj->UserBuffer.nChannels = channel;
/* Set ACLK to CCLK/16 */
adi_pwr_SetClockDivider(ADI_CLOCK_ACLK,16);
/* Set default values for conversion and delay cycles. This sets up a sampling rate of
16kHz. The sampling frequency is worked out from the following:
if delay time > 0:
Fs = ACLK / [((14 + sampling time) * oversample factor) + (delay time + 2)]
if delay time = 0:
Fs = ACLK / ((14 + sampling time) * oversample factor)
The sampling (or acquisition) and delay times are in number of ACLK clock cycles.
*/
obj->DelayCycles = 0;
obj->SampleCycles = 88;
/* Open the ADC device */
adi_adc_Open(ADC_DEV_NUM, DeviceMemory, sizeof(DeviceMemory), &hDevice);
obj->hDevice = hDevice;