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soc: Change DPORT access

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When two CPUs read the area of the DPORT and the area of the APB, the result is corrupted for the CPU that read the APB area.
And another CPU has valid data.

The method of eliminating this error.
Before reading the registers of the DPORT, make a preliminary reading of the APB register.
In this case, the joint access of the two CPUs to the registers of the APB and the DPORT is successful.
This commit is contained in:
Konstantin Kondrashov
2018-03-22 17:39:59 +05:00
parent d4276efed7
commit 8f80cc733d
8 changed files with 467 additions and 158 deletions
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19
components/esp32/dport_access.c
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@@ -217,3 +217,22 @@ void IRAM_ATTR esp_dport_access_int_resume(void)
#endif
}
/**
* @brief Read a sequence of DPORT registers to the buffer, SMP-safe version.
*
* This implementation uses a method of the pre-reading of the APB register
* before reading the register of the DPORT, without stall other CPU.
* There is disable/enable interrupt.
*
* @param[out] buff_out Contains the read data.
* @param[in] address Initial address for reading registers.
* @param[in] num_words The number of words.
*/
void IRAM_ATTR esp_dport_access_read_buffer(uint32_t *buff_out, uint32_t address, uint32_t num_words)
{
DPORT_INTERRUPT_DISABLE();
for (uint32_t i = 0; i < num_words; ++i) {
buff_out[i] = DPORT_SEQUENCE_REG_READ(address + i * 4);
}
DPORT_INTERRUPT_RESTORE();
}