ESP32-S2 RMT driver bug (IDFGH-6725)

[naffej]

Environment

• Module or chip used: ESP32-S2
• IDF version: from v4.3

Problem Description

esp-idf/components/soc/esp32s2/include/soc/soc_caps.h

Line 206 in 3441dd1

#define SOC_RMT_SUPPORT_RX_PINGPONG (1) /*!< Support Ping-Pong mode on RX path */

The file above has a wrong define. According to esp32-s2 technical reference manual, esp32-s2 doesn't have RMT RX wrap mode aka Ping-Pong mode. So this define triggers false behavior when receiving with RMT. If I manually unset the define, receiving works as intended.

And

According to the formers, the following function in

esp-idf/components/hal/esp32s2/include/hal/rmt_ll.h

Line 469 in 3441dd1

static inline void rmt_ll_rx_enable_pingpong(rmt_dev_t *dev, uint32_t channel, bool enable)

static inline void rmt_ll_rx_enable_pingpong(rmt_dev_t *dev, uint32_t channel, bool enable)
{
    dev->conf_ch[channel].conf1.chk_rx_carrier_en = enable;
}

has no sense in esp32-s2. In fact it enables a complete wrong register value.