Merge branch 'feature/uart_software_flow_control' into 'master'
uart: Add api call to switch on hardware support for 'software' flow control. (github #890) See merge request !1215
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commit
23f10e1a57
2 changed files with 33 additions and 0 deletions
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@ -269,6 +269,20 @@ esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask);
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*/
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esp_err_t uart_set_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t flow_ctrl, uint8_t rx_thresh);
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/**
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* @brief Set software flow control.
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*
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* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
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* @param enable switch on or off
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* @param rx_thresh_xon low water mark
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* @param rx_thresh_xoff high water mark
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*
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* @return
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* - ESP_OK Success
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* - ESP_FAIL Parameter error
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*/
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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);
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/**
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* @brief Get hardware flow control mode
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*
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@ -29,6 +29,9 @@
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#include "driver/uart.h"
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#include "driver/gpio.h"
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#define XOFF (char)0x13
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#define XON (char)0x11
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static const char* UART_TAG = "uart";
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#define UART_CHECK(a, str, ret_val) \
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if (!(a)) { \
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@ -199,6 +202,22 @@ esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask)
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return ESP_OK;
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}
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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)
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{
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UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
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UART_CHECK((rx_thresh_xon < UART_FIFO_LEN), "rx flow xon thresh error", ESP_FAIL);
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UART_CHECK((rx_thresh_xoff < UART_FIFO_LEN), "rx flow xon thresh error", ESP_FAIL);
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UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
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UART[uart_num]->flow_conf.sw_flow_con_en = enable? 1:0;
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UART[uart_num]->flow_conf.xonoff_del = enable?1:0;
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UART[uart_num]->swfc_conf.xon_threshold = rx_thresh_xon;
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UART[uart_num]->swfc_conf.xoff_threshold = rx_thresh_xoff;
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UART[uart_num]->swfc_conf.xon_char = XON;
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UART[uart_num]->swfc_conf.xoff_char = XOFF;
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UART_EXIT_CRITICAL(&uart_spinlock[uart_num]);
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return ESP_OK;
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}
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//only when UART_HW_FLOWCTRL_RTS is set , will the rx_thresh value be set.
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esp_err_t uart_set_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t flow_ctrl, uint8_t rx_thresh)
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{
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