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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> * 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); uart_write_bytes(EMSUART_NUM, &buf[i], 1);
delayMicroseconds(EMSUART_TX_WAIT_PLUS); delayMicroseconds(EMSUART_TX_WAIT_PLUS);
} }
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask); uart_gen_break(EMSUART_TX_BRK_PLUS);
delayMicroseconds(EMSUART_TX_BRK_PLUS);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
return EMS_TX_STATUS_OK; 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); uart_write_bytes(EMSUART_NUM, &buf[i], 1);
delayMicroseconds(EMSUART_TX_WAIT_HT3); delayMicroseconds(EMSUART_TX_WAIT_HT3);
} }
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask); uart_gen_break(EMSUART_TX_BRK_HT3);
delayMicroseconds(EMSUART_TX_BRK_HT3);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
return EMS_TX_STATUS_OK; 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); uart_get_buffered_data_len(EMSUART_NUM, &rx1);
} while ((rx1 == rx0) && (--timeoutcnt)); } while ((rx1 == rx0) && (--timeoutcnt));
} }
uart_set_line_inverse(EMSUART_NUM, UART_SIGNAL_TXD_INV ^ inverse_mask); uart_gen_break(EMSUART_TX_BRK_EMS);
delayMicroseconds(EMSUART_TX_BRK_EMS);
uart_set_line_inverse(EMSUART_NUM, inverse_mask);
return EMS_TX_STATUS_OK; return EMS_TX_STATUS_OK;
} }

1
src/uart/emsuart_esp32.h
View File

@@ -67,6 +67,7 @@ class EMSuart {
static uint16_t transmit(const uint8_t * buf, const uint8_t len); static uint16_t transmit(const uint8_t * buf, const uint8_t len);
private: private:
static void IRAM_ATTR uart_gen_break(uint32_t length_us);
static void uart_event_task(void * pvParameters); static void uart_event_task(void * pvParameters);
}; };