开发环境：
开发板:ESP32-C3-DEVKITM-1
IDE: Vscode esp-idf
操作系统：win10
IDF 版本：5.1.1
在使用RMT发射设置时，我发现esp-idf提供的例程只有对完整字节的处理，编码器时按照字节处理的。现在如果我有35bit的数据，应该怎样进行处理？ 我需要处理的是前导码+35bit数据位+连接码+32bit数据位的数据
之前想用esp-idf 4版本的解决问题，但是4版本的选择不了时钟源
编码器部分：
esp_err_t rmt_new_ir_nec_encoder(const ir_nec_encoder_config_t *config, rmt_encoder_handle_t *ret_encoder)
{
esp_err_t ret = ESP_OK;
//创建自定义编码器结构体，用于控制发送编码的流程
rmt_ir_nec_encoder_t *nec_encoder = NULL;
ESP_GOTO_ON_FALSE(config && ret_encoder, ESP_ERR_INVALID_ARG, err, TAG, "invalid argument");
nec_encoder = calloc(1, sizeof(rmt_ir_nec_encoder_t));
ESP_GOTO_ON_FALSE(nec_encoder, ESP_ERR_NO_MEM, err, TAG, "no mem for ir nec encoder");
nec_encoder->base.encode = rmt_encode_ir_nec; //这个函数会在rmt发送数据的时候被调用，在这个函数增加额外代码进行控制
nec_encoder->base.del = rmt_del_ir_nec_encoder; //这个函数在卸载rmt时被调用
nec_encoder->base.reset = rmt_ir_nec_encoder_reset; //这个函数在复位rmt时被调用
rmt_copy_encoder_config_t copy_encoder_config = {};
ESP_GOTO_ON_ERROR(rmt_new_copy_encoder(©_encoder_config, &nec_encoder->copy_encoder), err, TAG, "create copy encoder failed");
// 拷贝一个编码器，用于传输恒定字符，起始位和连接位
nec_encoder->nec_leading_symbol = (rmt_symbol_word_t) {
.level0 = 1,
.duration0 = 4500ULL * config->resolution / 1000000,
.level1 = 0,
.duration1 = 9000ULL * config->resolution / 1000000,
};
nec_encoder->nec_ending_symbol = (rmt_symbol_word_t) {
.level0 = 1,
.duration0 = 20000ULL * config->resolution / 1000000,
.level1 = 0,
.duration1 = 600 * config->resolution / 1000000,
};
//新建一个编码器,用于0，1表示
rmt_bytes_encoder_config_t bytes_encoder_config = {
.bit0 = { //
.level0 = 1,
.duration0 = 600 * config->resolution / 1000000, // T0H=560us
.level1 = 0,
.duration1 = 600 * config->resolution / 1000000, // T0L=560us
},
.bit1 = {
.level0 = 1,
.duration0 = 1600 * config->resolution / 1000000, // T1H=560us
.level1 = 0,
.duration1 = 600 * config->resolution / 1000000, // T1L=1690us
},
.flags.msb_first = 1,
};
//传入编码器配置，获取数据编码器句柄
ESP_GOTO_ON_ERROR(rmt_new_bytes_encoder(&bytes_encoder_config, &nec_encoder->bytes_encoder), err, TAG, "create bytes encoder failed");
//返回编码器
*ret_encoder = &nec_encoder->base;
return ESP_OK;
err:
if (nec_encoder) {
if (nec_encoder->bytes_encoder) {
rmt_del_encoder(nec_encoder->bytes_encoder);
}
if (nec_encoder->copy_encoder) {
rmt_del_encoder(nec_encoder->copy_encoder);
}
free(nec_encoder);
}
return ret;
}
自定义 NEC 协议的 RMT 编码器
static size_t rmt_encode_ir_nec(rmt_encoder_t *encoder, rmt_channel_handle_t channel, const void *primary_data, size_t data_size, rmt_encode_state_t *ret_state)
{
rmt_ir_nec_encoder_t *nec_encoder = __containerof(encoder, rmt_ir_nec_encoder_t, base);
rmt_encode_state_t session_state = RMT_ENCODING_RESET;
rmt_encode_state_t state = RMT_ENCODING_RESET;
size_t encoded_symbols = 0;
ir_nec_scan_code_t *scan_code = (ir_nec_scan_code_t *)primary_data;
rmt_encoder_handle_t copy_encoder = nec_encoder->copy_encoder;
rmt_encoder_handle_t bytes_encoder = nec_encoder->bytes_encoder;
switch (nec_encoder->state) {
case 0: // send leading code
encoded_symbols += copy_encoder->encode(copy_encoder, channel, &nec_encoder->nec_leading_symbol,
sizeof(rmt_symbol_word_t), &session_state);
if (session_state & RMT_ENCODING_COMPLETE) {
nec_encoder->state = 1; // we can only switch to next state when current encoder finished
}
if (session_state & RMT_ENCODING_MEM_FULL) {
state |= RMT_ENCODING_MEM_FULL;
goto out; // yield if there's no free space to put other encoding artifacts
}
// fall-through
case 1: // send DATA_front 35bit
encoded_symbols += bytes_encoder->encode(bytes_encoder, channel, &scan_code->command, sizeof(uint32_t), &session_state);
if (session_state & RMT_ENCODING_COMPLETE) {
nec_encoder->state = 2; // we can only switch to next state when current encoder finished
}
if (session_state & RMT_ENCODING_MEM_FULL) {
state |= RMT_ENCODING_MEM_FULL;
goto out; // yield if there's no free space to put other encoding artifacts
}
// fall-through
case 2: //
encoded_symbols += bytes_encoder->encode(bytes_encoder, channel, &scan_code->num, sizeof(ir_front_bit35), &session_state);
if (session_state & RMT_ENCODING_COMPLETE) {
nec_encoder->state = 3; // we can only switch to next state when current encoder finished
}
if (session_state & RMT_ENCODING_MEM_FULL) {
state |= RMT_ENCODING_MEM_FULL;
goto out; // yield if there's no free space to put other encoding artifacts
}
// fall-through
case 3: // send connect code
encoded_symbols += copy_encoder->encode(copy_encoder, channel, &nec_encoder->nec_ending_symbol,
sizeof(rmt_symbol_word_t), &session_state);
if (session_state & RMT_ENCODING_COMPLETE) {
nec_encoder->state = 4; // we can only switch to next state when current encoder finished
}
if (session_state & RMT_ENCODING_MEM_FULL) {
state |= RMT_ENCODING_MEM_FULL;
goto out; // yield if there's no free space to put other encoding artifacts
}
// fall-through
case 4: //send data_rear 32bit
encoded_symbols += bytes_encoder->encode(bytes_encoder, channel, &scan_code->command1, sizeof(uint32_t), &session_state);
if (session_state & RMT_ENCODING_COMPLETE) {
nec_encoder->state = RMT_ENCODING_RESET; // back to the initial encoding session
state |= RMT_ENCODING_COMPLETE;
}
if (session_state & RMT_ENCODING_MEM_FULL) {
state |= RMT_ENCODING_MEM_FULL;
goto out; // yield if there's no free space to put other encoding artifacts
}
}
out:
*ret_state = state;
return encoded_symbols;
}
按照上面代码实际上3bit输出了8bit的数据