Crash_Override/OVMS3-idf
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uart: Add api call to switch on hardware support for 'software' flow control.

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Cherry-picks https://github.com/espressif/esp-idf/pull/890
This commit is contained in:
Alex Burr 2017-08-01 16:02:44 +01:00 committed by Angus Gratton
parent 11a87ca811
commit 93cc3a77cb
2 changed files with 33 additions and 0 deletions
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14
components/driver/include/driver/uart.h
View file

@ -268,6 +268,20 @@ esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask);
*/
esp_err_t uart_set_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t flow_ctrl, uint8_t rx_thresh);
/**
* @brief Set software flow control.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param enable switch on or off
* @param rx_thresh_xon low water mark
* @param rx_thresh_xoff high water mark
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_sw_flow_ctrl(uart_port_t uart_num, bool enable, uint8_t rx_thresh_xon, uint8_t rx_thresh_xoff);
/**
* @brief Get hardware flow control mode
*

19
components/driver/uart.c
View file

@ -29,6 +29,9 @@
#include "driver/uart.h"
#include "driver/gpio.h"
#define XOFF (char)0x13
#define XON (char)0x11
static const char* UART_TAG = "uart";
#define UART_CHECK(a, str, ret_val) \
if (!(a)) { \
@ -199,6 +202,22 @@ esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask)
return ESP_OK;
}
esp_err_t uart_set_sw_flow_ctrl(uart_port_t uart_num, bool enable, uint8_t rx_thresh_xon, uint8_t rx_thresh_xoff)
{
UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
UART_CHECK((rx_thresh_xon < UART_FIFO_LEN), "rx flow xon thresh error", ESP_FAIL);
UART_CHECK((rx_thresh_xoff < UART_FIFO_LEN), "rx flow xon thresh error", ESP_FAIL);
UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
UART[uart_num]->flow_conf.sw_flow_con_en = enable? 1:0;
UART[uart_num]->flow_conf.xonoff_del = enable?1:0;
UART[uart_num]->swfc_conf.xon_threshold = rx_thresh_xon;
UART[uart_num]->swfc_conf.xoff_threshold = rx_thresh_xoff;
UART[uart_num]->swfc_conf.xon_char = XON;
UART[uart_num]->swfc_conf.xoff_char = XOFF;
UART_EXIT_CRITICAL(&uart_spinlock[uart_num]);
return ESP_OK;
}
//only when UART_HW_FLOWCTRL_RTS is set , will the rx_thresh value be set.
esp_err_t uart_set_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t flow_ctrl, uint8_t rx_thresh)
{