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improve uart break timing

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This commit is contained in:
MichaelDvP
2024-04-14 17:08:01 +02:00
parent 7b1845ed2e
commit 3c5790639e
2 changed files with 17 additions and 10 deletions
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24
src/uart/emsuart_esp32.cpp
View File

@@ -110,6 +110,18 @@ void EMSuart::stop() {
}
};
/*
* generate <BRK> by inverting tx
*/
void IRAM_ATTR EMSuart::uart_gen_break(uint32_t length_us) {
portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;
portENTER_CRITICAL(&mux);
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask);
delayMicroseconds(length_us);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
portEXIT_CRITICAL(&mux);
}
/*
* Sends a 1-byte poll, ending with a <BRK>
*/
@@ -141,9 +153,7 @@ uint16_t EMSuart::transmit(const uint8_t * buf, const uint8_t len) {
uart_write_bytes(EMSUART_NUM, &buf[i], 1);
delayMicroseconds(EMSUART_TX_WAIT_PLUS);
}
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask);
delayMicroseconds(EMSUART_TX_BRK_PLUS);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
uart_gen_break(EMSUART_TX_BRK_PLUS);
return EMS_TX_STATUS_OK;
}
@@ -152,9 +162,7 @@ uint16_t EMSuart::transmit(const uint8_t * buf, const uint8_t len) {
uart_write_bytes(EMSUART_NUM, &buf[i], 1);
delayMicroseconds(EMSUART_TX_WAIT_HT3);
}
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask);
delayMicroseconds(EMSUART_TX_BRK_HT3);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
uart_gen_break(EMSUART_TX_BRK_HT3);
return EMS_TX_STATUS_OK;
}
@@ -169,9 +177,7 @@ uint16_t EMSuart::transmit(const uint8_t * buf, const uint8_t len) {
uart_get_buffered_data_len(EMSUART_NUM, &rx1);
} while ((rx1 == rx0) && (--timeoutcnt));
}
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask);
delayMicroseconds(EMSUART_TX_BRK_EMS);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
uart_gen_break(EMSUART_TX_BRK_EMS);
return EMS_TX_STATUS_OK;
}

3
src/uart/emsuart_esp32.h
View File

@@ -67,7 +67,8 @@ class EMSuart {
static uint16_t transmit(const uint8_t * buf, const uint8_t len);
private:
static void uart_event_task(void * pvParameters);
static void IRAM_ATTR uart_gen_break(uint32_t length_us);
static void uart_event_task(void * pvParameters);
};
} // namespace emsesp