docs/library/pyb.ADC: Remove outdated ADCAll code example.
@@ -170,44 +170,7 @@ The ADCAll Object
The default value is 0xffffffff which means all analog inputs are active. If just the internal
channels (16..18) are required, the mask value should be 0x70000.
- It is possible to access channle 16..18 values without incurring the side effects of ``ADCAll``::
-
- def adcread(chan): # 16 temp 17 vbat 18 vref
- assert chan >= 16 and chan <= 18, 'Invalid ADC channel'
- start = pyb.millis()
- timeout = 100
- stm.mem32[stm.RCC + stm.RCC_APB2ENR] |= 0x100 # enable ADC1 clock.0x4100
- stm.mem32[stm.ADC1 + stm.ADC_CR2] = 1 # Turn on ADC
- stm.mem32[stm.ADC1 + stm.ADC_CR1] = 0 # 12 bit
- if chan == 17:
- stm.mem32[stm.ADC1 + stm.ADC_SMPR1] = 0x200000 # 15 cycles
- stm.mem32[stm.ADC + 4] = 1 << 23
- elif chan == 18:
- stm.mem32[stm.ADC1 + stm.ADC_SMPR1] = 0x1000000
- stm.mem32[stm.ADC + 4] = 0xc00000
- else:
- stm.mem32[stm.ADC1 + stm.ADC_SMPR1] = 0x40000
- stm.mem32[stm.ADC + 4] = 1 << 23
- stm.mem32[stm.ADC1 + stm.ADC_SQR3] = chan
- stm.mem32[stm.ADC1 + stm.ADC_CR2] = 1 | (1 << 30) | (1 << 10) # start conversion
- while not stm.mem32[stm.ADC1 + stm.ADC_SR] & 2: # wait for EOC
- if pyb.elapsed_millis(start) > timeout:
- raise OSError('ADC timout')
- data = stm.mem32[stm.ADC1 + stm.ADC_DR] # clear down EOC
- stm.mem32[stm.ADC1 + stm.ADC_CR2] = 0 # Turn off ADC
- return data
-
- def v33():
- return 4096 * 1.21 / adcread(17)
-
- def vbat():
- return 1.21 * 2 * adcread(18) / adcread(17) # 2:1 divider on Vbat channel
-
- def vref():
- return 3.3 * adcread(17) / 4096
-
- def temperature():
- return 25 + 400 * (3.3 * adcread(16) / 4096 - 0.76)
-
- Note that this example is only valid for the F405 MCU and all values are not corrected by Vref and
- factory calibration data.
+ Example::
+
+ adcall = pyb.ADCAll(12, 0x70000) # 12 bit resolution, internal channels
+ temp = adcall.read_core_temp()
