Y334275 opened a new pull request, #18350:
URL: https://github.com/apache/nuttx/pull/18350
## Summary
PSRAM buffers require explicit cache management when used with DMA, as DMA
accesses physical memory directly, bypassing the CPU cache.
Before starting DMA transfer:
- For an **OUTGOING** transfer (PSRAM -> Device): Call
`cache_writeback_addr()` to flush dirty data from cache to PSRAM.
- For an **INCOMING** transfer (Device -> PSRAM): Call
`cache_invalidate_addr()` to invalidate cache lines, ensuring DMA can write to
PSRAM.
This ensures cache coherence and correct data transmission in burst mode.
## Impact
- esp32s3 dma and dma-capable peripherals
## Testing
### Environment
- **OS/Framework**: px4 with nuttx 12.12.0
- **Hardware**: esp32s3 with icm42688p connected via spi
### Test method
Added temporary debug logs in `esp32s3_spi_dma_exchange` to monitor transfer
behavior.
Here is the code:
```c
static void esp32s3_spi_dma_exchange(struct esp32s3_spi_priv_s *priv,
const void *txbuffer,
void *rxbuffer,
uint32_t nwords)
{
// ... existing code
infodumpbuffer("transferred buffer", priv->dma_txdesc[0].pbuf,
priv->dma_txdesc[0].ctrl & 0xfff);
infodumpbuffer("received buffer", priv->dma_rxdesc[0].pbuf,
priv->dma_rxdesc[0].ctrl & 0xfff);
esp32s3_spi_clr_regbits(SPI_DMA_INT_ENA_REG(priv->config->id),
SPI_TRANS_DONE_INT_ENA_M);
}
```
<details>
<summary>Logs before fix</summary>
```
ESP-ROM:esp32s3-20210327
Build:Mar 27 202�ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0xb (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:2
load:0x3fc94eb0,len:0x22d0
load:0x40374000,len:0x8dac
load:0x50000000,len:0x20
SHA-256 comparison failed:
Calculated: 2e1352ca0449987b8cafdad9ab8bc6dc5b3724a77b06fdca48188b9d9771be73
Expected: 00000000204f0000000000000000000000000000000000000000000000000000
Attempting to boot anyway...
entry 0x40374a38
*** Booting NuttX ***
I (70) boot: chip revision: v0.2
I (70) boot: efuse block revision: v1.3
I (70) boot.esp32s3: Boot SPI Speed : 40MHz
I (71) boot.esp32s3: SPI Mode : DIO
I (75) boot.esp32s3: SPI Flash Size : 4MB
I (78) boot: Enabling RNG early entropy source...
dram: lma 0x00000020 vma 0x3fc94eb0 len 0x22d0 (8912)
iram: lma 0x000022f8 vma 0x40374000 len 0x8dac (36268)
rtc: lma 0x0000b0ac vma 0x50000000 len 0x20 (32)
padd: lma 0x0000b0d8 vma 0x00000000 len 0x4f20 (20256)
imap: lma 0x00010000 vma 0x42010000 len 0x14fd54 (1375572)
padd: lma 0x0015fd5c vma 0x00000000 len 0x29c (668)
dmap: lma 0x00160000 vma 0x3c170000 len 0x59c64 (367716)
total segments stored 7
ABI (799) app_init: Application information:
I (799) app_init: Compile time: Feb 4 2026 17:24:39
I (804) app_init: ELF file SHA256: 000000000...
I (804) app_init: ESP-IDF:
I (805) sleep_gpio: Configure to isolate all GPIO pins in sleep state
I (812) sleep_gpio: Enable automatic switching of GPIO sleep configuration
esp32s3_spi_setfrequency: frequency=400000, actual=400000
esp32s3_spi_setbits: nbits=8
esp32s3_spi_setmode: mode=0
esp32s3_spi_setfrequency: frequency=400000, actual=400000
esp32s3_spi_setbits: nbits=8
esp32s3_spi_setmode: mode=0
esp32s3_spi_setmode: mode=0
esp32s3_spi_setbits: nbits=8
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x95 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x48 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x1 and recv=0xff
esp32s3_spi_poll_send: send=0xaa and recv=0xff
esp32s3_spi_poll_send: send=0x87 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xaa
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x77 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x69 and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x77 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x69 and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x7a and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xc0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x80
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x49 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xfe
esp32s3_spi_poll_send: send=0xff and recv=0x40
esp32s3_spi_poll_send: send=0xff and recv=0xe
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x32
esp32s3_spi_poll_send: send=0xff and recv=0x5b
esp32s3_spi_poll_send: send=0xff and recv=0x59
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x74
esp32s3_spi_poll_send: send=0xff and recv=0x7b
esp32s3_spi_poll_send: send=0xff and recv=0x7f
esp32s3_spi_poll_send: send=0xff and recv=0x80
esp32s3_spi_poll_send: send=0xff and recv=0xa
esp32s3_spi_poll_send: send=0xff and recv=0x40
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x9d
esp32s3_spi_poll_send: send=0xff and recv=0xa6
esp32s3_spi_poll_send: send=0xff and recv=0x66
esp32s3_spi_setfrequency: frequency=20000000, actual=20000000
esp32s3_spi_poll_send: send=0xff and recv=0xff
NuttShell (NSH) NuttX-11.0.0
nsh> icm42688p start -s
esp32s3_spi_setfrequency: frequency=24000000, actual=26666666
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f5 00 ..
received buffer (0x3c1d53a0):
0000 f5 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
icm42688p unexpected WHO_AM_I 0x00
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f6 00 ..
received buffer (0x3c1d53a0):
0000 f6 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f5 00 ..
received buffer (0x3c1d53a0):
0000 f5 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
icm42688p unexpected WHO_AM_I 0x00
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f6 00 ..
received buffer (0x3c1d53a0):
0000 f6 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f5 00 ..
received buffer (0x3c1d53a0):
0000 f5 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
icm42688p unexpected WHO_AM_I 0x00
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 f6 00 ..
received buffer (0x3c1d53a0):
0000 f6 00 a0 41 d0 53 1d 3c 80 58 1d 3c 48 7b 17 3c ...A.S.<.X.<H{.<
icm42688p probe failed
icm42688p SPI::init failed (-1)
ERROR [SPI_I2C] icm42688p: no instance started (no device on bus?)
nsh>
```
</details>
<details>
<summary>Logs after fix</summary>
```
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0xb (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:2
load:0x3fc94eb0,len:0x22d0
load:0x40374000,len:0x8dac
load:0x50000000,len:0x20
SHA-256 comparison failed:
Calculated: ee29b22b9d8744b1bf5168fc0818892967f8c1a94ea69183a22d6aa00d2b0674
Expected: 00000000204f0000000000000000000000000000000000000000000000000000
Attempting to boot anyway...
entry 0x40374a38
*** Booting NuttX ***
I (70) boot: chip revision: v0.2
I (70) boot: efuse block revision: v1.3
I (70) boot.esp32s3: Boot SPI Speed : 40MHz
I (71) boot.esp32s3: SPI Mode : DIO
I (75) boot.esp32s3: SPI Flash Size : 4MB
I (78) boot: Enabling RNG early entropy source...
dram: lma 0x00000020 vma 0x3fc94eb0 len 0x22d0 (8912)
iram: lma 0x000022f8 vma 0x40374000 len 0x8dac (36268)
rtc: lma 0x0000b0ac vma 0x50000000 len 0x20 (32)
padd: lma 0x0000b0d8 vma 0x00000000 len 0x4f20 (20256)
imap: lma 0x00010000 vma 0x42010000 len 0x14fd88 (1375624)
padd: lma 0x0015fd90 vma 0x00000000 len 0x268 (616)
dmap: lma 0x00160000 vma 0x3c170000 len 0x59c64 (367716)
total segments stored 7
ABI (799) app_init: Application information:
I (799) app_init: Compile time: Feb 4 2026 17:29:18
I (804) app_init: ELF file SHA256: 000000000...
I (804) app_init: ESP-IDF:
I (805) sleep_gpio: Configure to isolate all GPIO pins in sleep state
I (812) sleep_gpio: Enable automatic switching of GPIO sleep configuration
esp32s3_spi_setfrequency: frequency=400000, actual=400000
esp32s3_spi_setbits: nbits=8
esp32s3_spi_setmode: mode=0
esp32s3_spi_setfrequency: frequency=400000, actual=400000
esp32s3_spi_setbits: nbits=8
esp32s3_spi_setmode: mode=0
esp32s3_spi_setmode: mode=0
esp32s3_spi_setbits: nbits=8
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x95 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x48 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x1 and recv=0xff
esp32s3_spi_poll_send: send=0xaa and recv=0xff
esp32s3_spi_poll_send: send=0x87 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xaa
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x77 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x69 and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x77 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x1
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x69 and recv=0xff
esp32s3_spi_poll_send: send=0x40 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x7a and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xc0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x80
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0x49 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0x0 and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0xff
esp32s3_spi_poll_send: send=0xff and recv=0xfe
esp32s3_spi_poll_send: send=0xff and recv=0x40
esp32s3_spi_poll_send: send=0xff and recv=0xe
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x32
esp32s3_spi_poll_send: send=0xff and recv=0x5b
esp32s3_spi_poll_send: send=0xff and recv=0x59
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x74
esp32s3_spi_poll_send: send=0xff and recv=0x7b
esp32s3_spi_poll_send: send=0xff and recv=0x7f
esp32s3_spi_poll_send: send=0xff and recv=0x80
esp32s3_spi_poll_send: send=0xff and recv=0xa
esp32s3_spi_poll_send: send=0xff and recv=0x40
esp32s3_spi_poll_send: send=0xff and recv=0x0
esp32s3_spi_poll_send: send=0xff and recv=0x9d
esp32s3_spi_poll_send: send=0xff and recv=0xa6
esp32s3_spi_poll_send: send=0xff and recv=0x66
esp32s3_spi_setfrequency: frequency=20000000, actual=20000000
esp32s3_spi_poll_send: send=0xff and recv=0xff
NuttShell (NSH) NuttX-11.0.0
nsh> icm42688p start -s
esp32s3_spi_setfrequency: frequency=24000000, actual=26666666
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 00 00 ..
received buffer (0x3c1d53a0):
0000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
icm42688p unexpected WHO_AM_I 0x00
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 00 00 ..
received buffer (0x3c1d53a0):
0000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d53a0):
0000 00 47 .G
received buffer (0x3c1d53a0):
0000 00 47 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .G..............
icm42688p on SPI bus 2 at 38 (24000 KHz)
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d5418):
0000 00 00 ..
received buffer (0x3c1d5418):
0000 00 00 00 00 00 00 00 00 dd d0 14 82 50 54 1d 3c ............PT.<
icm42688p #0 on SPI bus 2
esp32s3_spi_setmode: mode=3
esp32s3_spi_setbits: nbits=8
esp32s3_spi_dma_exchange: nwords=2
transferred buffer (0x3c1d5410):
0000 00 07 ..
received buffer (0x3c1d5410):
0000 00 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
nsh> esp32s3_spi_setmode: mode=3
```
</details>
Log comparison shows the fix is working:
- **Before fix**: The buffer content remains unchanged (`0xf5 0x00` and
`0xf6 0x00`), indicating DMA failed to write data to the buffer (or read from
it).
- **After fix**: The buffer content is overwritten with new data, confirming
that DMA successfully transferred data to/from the buffer.
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