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feat(hal): add util function to reverse a 8bit byte

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This commit is contained in:
morris
2023-10-11 10:28:49 +08:00
parent 3de31924ac
commit e92a1515be
7 changed files with 45 additions and 23 deletions
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components/driver/rmt/rmt_encoder.c
+2 -10
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@@ -18,6 +18,7 @@
#include "esp_check.h"
#include "driver/rmt_encoder.h"
#include "rmt_private.h"
#include "hal/hal_utils.h"
static const char *TAG = "rmt";
@@ -46,15 +47,6 @@ static esp_err_t rmt_bytes_encoder_reset(rmt_encoder_t *encoder)
return ESP_OK;
}
__attribute__((always_inline))
static inline uint8_t _bitwise_reverse(uint8_t n)
{
n = ((n & 0xf0) >> 4) | ((n & 0x0f) << 4);
n = ((n & 0xcc) >> 2) | ((n & 0x33) << 2);
n = ((n & 0xaa) >> 1) | ((n & 0x55) << 1);
return n;
}
static size_t IRAM_ATTR rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_handle_t channel,
const void *primary_data, size_t data_size, rmt_encode_state_t *ret_state)
{
@@ -98,7 +90,7 @@ static size_t IRAM_ATTR rmt_encode_bytes(rmt_encoder_t *encoder, rmt_channel_han
uint8_t cur_byte = nd[byte_index];
// bit-wise reverse
if (bytes_encoder->flags.msb_first) {
cur_byte = _bitwise_reverse(cur_byte);
cur_byte = hal_utils_bitwise_reverse8(cur_byte);
}
while ((len > 0) && (bit_index < 8)) {
if (cur_byte & (1 << bit_index)) {