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ir_nec: add support for extended command address

This commit is contained in:
King Kévin 2018-10-28 22:19:48 +01:00
parent 2f42659b18
commit a7aab104ba
2 changed files with 24 additions and 9 deletions
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25
lib/ir_nec.c
View File

@ -39,14 +39,21 @@
*/
#define IR_NEC_TIMER 4 /**< timer peripheral */
#define IR_NEC_CHANNEL 3 /**< channel used as input capture */
#define IR_NEC_JITTER 20 /**< signal timing jitter in % tolerated in timing */
#define IR_NEC_JITTER 40 /**< signal timing jitter in % tolerated in timing */
/** @} */
volatile bool ir_nec_code_received_flag = false;
struct ir_nec_code_t ir_nec_code_received;
void ir_nec_setup(void)
/** if the extended address in the code is used
* the extended address uses all 16-bits instead of having redundant/robust 2x8-bits address
*/
static bool ir_nec_extended = false;
void ir_nec_setup(bool extended)
{
ir_nec_extended = extended; // remember setting
// setup timer to measure signal timing for bit decoding (use timer channel as input capture)
rcc_periph_clock_enable(RCC_TIM_CH(IR_NEC_TIMER, IR_NEC_CHANNEL)); // enable clock for GPIO peripheral
rcc_periph_clock_enable(RCC_TIM(IR_NEC_TIMER)); // enable clock for timer peripheral
@ -149,15 +156,21 @@ void TIM_ISR(IR_NEC_TIMER)(void)
uint8_t naddress = (bits >> 16) & 0xff; // get negated 8 address bits
uint8_t command = (bits >> 8) & 0xff; // get 8 command bits
uint8_t ncommand = (bits >> 0) & 0xff; // get negate 8 commend bits
if (0xff != (address ^ naddress)) { // the address and its negative do not match
goto error;
if (!ir_nec_extended) { // the 8-bits address has its inverse
if (0xff != (address ^ naddress)) { // the address and its inverse do not match
goto error;
}
}
if (0xff != (command ^ ncommand)) { // the command and its negative do not match
if (0xff != (command ^ ncommand)) { // the command and its inverse do not match
goto error;
}
valid = true; // remember we have a valid signal
code.repeat = false; // this is not a repeat code
code.address = address; // save decoded address
if (ir_nec_extended) {
code.address = (address << 8) + naddress;
} else {
code.address = address; // save decoded address
}
code.command = command; // save decoded command
ir_nec_code_received.repeat = code.repeat; // transfer code to user
ir_nec_code_received.address = code.address; // transfer code to user

8
lib/ir_nec.h
View File

@ -26,12 +26,14 @@ extern volatile bool ir_nec_code_received_flag;
/** IR NEC code */
struct ir_nec_code_t {
bool repeat; /**< if this is only a code repeat (received 42.42 ms after the code, 98.75 ms after a repeat) */
uint8_t address; /**< code address (extended 16-bit address is not supported) */
uint16_t address; /**< code address (8-bit for non-extended, 16-bit for extended) */
uint8_t command; /**< code command */
};
/** last IR NEC code received */
extern struct ir_nec_code_t ir_nec_code_received;
/** setup peripherals to receive IR NEC codes */
void ir_nec_setup(void);
/** setup peripherals to receive IR NEC codes
* @param[in] extended if the command address is extended (using 16 bits instead of 8, at the cost of error checking)
*/
void ir_nec_setup(bool extended);