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Turn off JTAG in adc_init

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This commit is contained in:
Ralf Schlatterbeck 2014-06-30 14:25:33 +02:00
parent ef06560465
commit 1a1aaa883e
1 changed files with 13 additions and 0 deletions
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13
platform/osd-merkur/dev/adc.h
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@ -39,9 +39,22 @@ static inline void adc_fin (void)
static inline void adc_init (void) static inline void adc_init (void)
{ {
uint8_t temp;
ADCSRC = 0; ADCSRC = 0;
ADCSRB = 0; ADCSRB = 0;
adc_fin (); adc_fin ();
/*
* Disable JTAG interface
* Hardware manual about JTD bit:
* "In order to avoid unintentional disabling or enabling of the
* JTAG interface, a timed sequence must be followed when changing
* this bit: The application software must write this bit to the
* desired value twice within four cycles to change its value."
* 15.4.1 "MCUCR - MCU Control Register", p. 219
*/
temp = MCUCR | (1 << JTD);
MCUCR = temp;
MCUCR = temp;
} }
int readADC(uint8_t pin); int readADC(uint8_t pin);