初版
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huxi
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#include "ir_decoder.h"
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#include "jiffies.h"
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#define LOG_TAG_CONST PERI
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#define LOG_TAG "[ir_decode]"
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#define LOG_ERROR_ENABLE
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#define LOG_DEBUG_ENABLE
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#define LOG_INFO_ENABLE
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/* #define LOG_DUMP_ENABLE */
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#define LOG_CLI_ENABLE
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#include "debug.h"
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#define NEC_NBITS 32
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#define NEC_TIME_DEVIATION 10 //允许10%偏差
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#define NEC_UNIT_TIME 563
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#define NEC_HEADER_TIME ((16 + 8) * NEC_UNIT_TIME)
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#define NEC_BIT_0_TIME ((1 + 1) * NEC_UNIT_TIME)
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#define NEC_BIT_1_TIME ((3 + 1) * NEC_UNIT_TIME)
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#define NEC_REPEAT_TIME ((16 + 4) * NEC_UNIT_TIME)
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#define NEC_TIMEOUT_MS 150 //150ms
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enum nec_data_type {
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NEC_ERROR = 0,
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NEC_HEAD,
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NEC_BIT_1,
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NEC_BIT_0,
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NEC_REPEAT,
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};
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struct ir_decode_t {
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u32 jiffies; //记录当前系统时间
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u32 ir_data; //存储接收到的红外数据,4*8bit = (cmd_not + cmd +addr_not + addr)
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u8 capture_tid; //用于捕获功能的tiemr_id
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u8 bit_count; //有效bit个数
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u8 command_count; //有效命令个数
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};
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static struct ir_decode_t _ir_decode;
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static struct ir_decode_t *ir_decode = &_ir_decode;
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static u32 get_cur_jiffies()
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{
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return jiffies;
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}
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static u32 jiffies_timeout_check()
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{
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u32 jiffies_cur = get_cur_jiffies();
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int jiffies_diff = jiffies_cur - ir_decode->jiffies;
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ir_decode->jiffies = jiffies_cur;
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//判断是否溢出
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if (jiffies_diff < 0) {
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jiffies_diff += 0xffffffff;
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}
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//判断两次下降沿间隔时间是否超时
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if (jiffies_to_msecs(jiffies_diff) >= NEC_TIMEOUT_MS) {
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return 1;
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} else {
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return 0;
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}
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}
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static u32 is_time_within(u32 t, u32 center, u32 deviation)
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{
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if (__builtin_abs(((int)t - (int)center)) < (center * deviation / 100)) {
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return 1;
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} else {
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return 0;
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}
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}
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static u32 ir_decoder_pulse_check(u32 us)
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{
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u32 type;
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if (is_time_within(us, NEC_HEADER_TIME, NEC_TIME_DEVIATION)) {
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type = NEC_HEAD;
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} else if (is_time_within(us, NEC_BIT_0_TIME, NEC_TIME_DEVIATION)) {
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type = NEC_BIT_0;
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} else if (is_time_within(us, NEC_BIT_1_TIME, NEC_TIME_DEVIATION)) {
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type = NEC_BIT_1;
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} else if (is_time_within(us, NEC_REPEAT_TIME, NEC_TIME_DEVIATION)) {
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type = NEC_REPEAT;
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} else {
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type = NEC_ERROR;
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}
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log_debug("us = %d, type = %d\n", us, type);
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return type;
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}
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static void ir_decoder_bit_count_check()
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{
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if (ir_decode->bit_count == NEC_NBITS) {
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ir_decode->command_count++;
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log_debug("ir_data:0x%08x, command_count:%d\n", ir_decode->ir_data, ir_decode->command_count);
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}
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}
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static void ir_decode_irq(u32 tid, void *arg)
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{
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u32 us = gptimer_get_capture_cnt2us(tid);
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//超时或第一个边沿直接退出
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if (jiffies_timeout_check()) {
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return;
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}
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u32 type = ir_decoder_pulse_check(us);
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switch (type) {
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case NEC_HEAD:
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ir_decode->bit_count = 0;
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ir_decode->command_count = 0;
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break;
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case NEC_BIT_1:
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ir_decode->ir_data >>= 1;
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ir_decode->ir_data |= 0x80000000;
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ir_decode->bit_count++;
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ir_decoder_bit_count_check();
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break;
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case NEC_BIT_0:
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ir_decode->ir_data >>= 1;
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ir_decode->bit_count++;
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ir_decoder_bit_count_check();
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break;
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case NEC_REPEAT:
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ir_decoder_bit_count_check();
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break;
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default:
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break;
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}
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}
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void ir_decoder_init(const struct gptimer_config *gt_cfg)
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{
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log_info("%s()\n", __func__);
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memset(ir_decode, 0, sizeof(struct ir_decode_t));
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ir_decode->jiffies = get_cur_jiffies();
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#ifdef TCFG_IR_DECODER_TID
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ir_decode->capture_tid = gptimer_init(TCFG_IR_DECODER_TID, gt_cfg); //用户配置固定timer
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#else
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ir_decode->capture_tid = gptimer_init(TIMERx, gt_cfg); //内部分配空闲timer
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#endif
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log_info("ir_decode->capture_tid = %d\n", ir_decode->capture_tid);
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if (gt_cfg->mode == GPTIMER_MODE_CAPTURE_EDGE_RISE) {
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gpio_set_mode(gt_cfg->capture.port, gt_cfg->capture.pin, PORT_INPUT_PULLDOWN_10K);//开下拉
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} else if (gt_cfg->mode == GPTIMER_MODE_CAPTURE_EDGE_FALL) {
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gpio_set_mode(gt_cfg->capture.port, gt_cfg->capture.pin, PORT_INPUT_PULLUP_10K);//开上拉
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}
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if (gt_cfg->irq_cb == NULL) {
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gptimer_set_irq_callback(ir_decode->capture_tid, ir_decode_irq);
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}
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gptimer_start(ir_decode->capture_tid);
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}
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void ir_decoder_deinit()
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{
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gptimer_deinit(ir_decode->capture_tid);
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}
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u32 ir_decoder_get_data(void)
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{
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u32 data = -1;
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if (ir_decode->command_count) {
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ir_decode->command_count--;
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data = ir_decode->ir_data;
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}
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return data;
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}
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u32 ir_decoder_get_command_value(void)
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{
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u32 data = ir_decoder_get_data();
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if (data == -1) {
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return -1;
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}
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u8 cmd = (data >> 16) & 0xff;
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u8 cmd_not = (data >> 24) & 0xff;
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if ((cmd ^ cmd_not) != 0xff) {
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cmd = -1;
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}
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return cmd;
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}
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u32 ir_decoder_get_command_value_uncheck(void)
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{
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u32 data = ir_decoder_get_data();
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if (data == -1) {
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return -1;
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}
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u8 cmd = (data >> 16) & 0xff;
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return cmd;
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}
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u32 ir_decoder_get_address_value(void)
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{
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u32 data = ir_decoder_get_data();
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if (data == -1) {
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return -1;
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}
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u8 addr = (data >> 0) & 0xff;
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u8 addr_not = (data >> 8) & 0xff;
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if ((addr ^ addr_not) != 0xff) {
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addr = (u8) - 1;
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}
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return addr;
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}
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u32 ir_decoder_get_address_value_uncheck(void)
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{
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u32 data = ir_decoder_get_data();
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if (data == -1) {
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return -1;
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}
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u8 addr = (data >> 0) & 0xff;
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return addr;
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}
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void ir_decoder_dump()
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{
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printf("header:%d, header_min:%d, header_max:%d\n",
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NEC_HEADER_TIME, (NEC_HEADER_TIME * (100 - NEC_TIME_DEVIATION) / 100), (NEC_HEADER_TIME * (100 + NEC_TIME_DEVIATION) / 100));
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printf("bit0:%d, bit0_min:%d, bit0_max:%d\n",
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NEC_BIT_0_TIME, (NEC_BIT_0_TIME * (100 - NEC_TIME_DEVIATION) / 100), (NEC_BIT_0_TIME * (100 + NEC_TIME_DEVIATION) / 100));
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printf("bit1:%d, bit1_min:%d, bit1_max:%d\n",
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NEC_BIT_1_TIME, (NEC_BIT_1_TIME * (100 - NEC_TIME_DEVIATION) / 100), (NEC_BIT_1_TIME * (100 + NEC_TIME_DEVIATION) / 100));
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printf("repeat:%d, repeat_min:%d, repeat_max:%d\n",
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NEC_REPEAT_TIME, (NEC_REPEAT_TIME * (100 - NEC_TIME_DEVIATION) / 100), (NEC_REPEAT_TIME * (100 + NEC_TIME_DEVIATION) / 100));
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}
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