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fix(driver): allocate driver objects containing atomic variables from internal SRAM

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Objects with atomic members must not be allocated to PSRAM, otherwise
the ordering guarantee of atomic accesses is weakened due to a hardware
behavior on ESP32 chips. Explicitly request MALLOC_CAP_INTERNAL |
MALLOC_CAP_8BIT for:

- i2c master bus object (atomic status/trans_idx)
- ISP processor and AE/AF/AWB/HIST controllers (atomic fsm)
- JPEG decoder/encoder dma2d transaction descriptors (atomic started)
- PPA transaction storage embedding dma2d_trans_t
- dma2d m2m test transaction embedding dma2d_trans_t
This commit is contained in:
morris
2026-09-03 09:46:48 +08:00
parent ffac0bf942
commit 37758ef327
9 changed files with 18 additions and 9 deletions
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components/esp_driver_i2c/i2c_master.c
+2 -1
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@@ -1052,7 +1052,8 @@ esp_err_t i2c_new_master_bus(const i2c_master_bus_config_t *bus_config, i2c_mast
ESP_RETURN_ON_FALSE(bus_config->flags.allow_pd == 0, ESP_ERR_NOT_SUPPORTED, TAG, "not able to power down in light sleep");
#endif // SOC_I2C_SUPPORT_SLEEP_RETENTION
i2c_master = heap_caps_calloc(1, sizeof(i2c_master_bus_t) + 20 * sizeof(i2c_transaction_t), I2C_MEM_ALLOC_CAPS);
// always allocate memory from internal memory because the driver object contains atomic variables
i2c_master = heap_caps_calloc(1, sizeof(i2c_master_bus_t) + 20 * sizeof(i2c_transaction_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
ESP_RETURN_ON_FALSE(i2c_master, ESP_ERR_NO_MEM, TAG, "no memory for i2c master bus");