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Fix analogin scaling for EFM32 target 

Fixes #5115.

`analogin_read_u16` returns a value in the range `0x0000 - 0xFFF0`
since the resolution of the ADC is 12 bits. However, in
`analogin_read` this value gets divided by `0xFFFF` assuming the range
is `0x0000-0xFFFF`. This causes a small error in the value returned by
`AnalogIn::read` for the EFM32 target.
pull/5223/head
Seppe Stas 2017-09-29 14:39:29 +02:00
parent bb61b42fba
commit 81cc5a4960
1 changed files with 2 additions and 2 deletions
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4
targets/TARGET_Silicon_Labs/TARGET_EFM32/analogin_api.c
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@ -99,8 +99,8 @@ uint16_t analogin_read_u16(analogin_t *obj)
float analogin_read(analogin_t *obj)
{
/* Convert from a uint16 to a float between 0 and 1 by division by 0xFFFF */
return analogin_read_u16(obj) / (float) 0xFFFF;
/* Convert from a uint16 to a float between 0 and 1 by division by 0xFFF0 */
return analogin_read_u16(obj) / (float) 0xFFF0;
}
#endif