mirror of
https://github.com/espressif/esp-idf.git
synced 2026-04-27 19:13:21 +00:00
Merge branch 'feature/esp32s2beta_merge_fix_modbus_examples' into 'master'
freemodbus: feature esp32s2beta fix modbus examples Closes IDF-1028 See merge request espressif/esp-idf!6365
This commit is contained in:
Michael (XIAO Xufeng)
@@ -52,13 +52,13 @@ static const char* UART_TAG = "uart";
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return (ret_val); \
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}
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#define UART_EMPTY_THRESH_DEFAULT (10)
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#define UART_FULL_THRESH_DEFAULT (120)
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#define UART_TOUT_THRESH_DEFAULT (10)
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#define UART_CLKDIV_FRAG_BIT_WIDTH (3)
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#define UART_TX_IDLE_NUM_DEFAULT (0)
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#define UART_PATTERN_DET_QLEN_DEFAULT (10)
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#define UART_MIN_WAKEUP_THRESH (SOC_UART_MIN_WAKEUP_THRESH)
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#define UART_EMPTY_THRESH_DEFAULT (10)
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#define UART_FULL_THRESH_DEFAULT (120)
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#define UART_TOUT_THRESH_DEFAULT (10)
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#define UART_CLKDIV_FRAG_BIT_WIDTH (3)
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#define UART_TX_IDLE_NUM_DEFAULT (0)
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#define UART_PATTERN_DET_QLEN_DEFAULT (10)
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#define UART_MIN_WAKEUP_THRESH (SOC_UART_MIN_WAKEUP_THRESH)
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#define UART_INTR_CONFIG_FLAG ((UART_INTR_RXFIFO_FULL) \
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| (UART_INTR_RXFIFO_TOUT) \
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@@ -1492,8 +1492,12 @@ esp_err_t uart_set_tx_empty_threshold(uart_port_t uart_num, int threshold)
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esp_err_t uart_set_rx_timeout(uart_port_t uart_num, const uint8_t tout_thresh)
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{
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UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_ERR_INVALID_ARG);
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UART_CHECK((tout_thresh < 127), "tout_thresh max value is 126", ESP_ERR_INVALID_ARG);
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// get maximum timeout threshold
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uint16_t tout_max_thresh = uart_hal_get_max_rx_timeout_thrd(&(uart_context[uart_num].hal));
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if (tout_thresh > tout_max_thresh) {
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ESP_LOGE(UART_TAG, "tout_thresh = %d > maximum value = %d", tout_thresh, tout_max_thresh);
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return ESP_ERR_INVALID_ARG;
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}
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UART_ENTER_CRITICAL(&(uart_context[uart_num].spinlock));
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uart_hal_set_rx_timeout(&(uart_context[uart_num].hal), tout_thresh);
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UART_EXIT_CRITICAL(&(uart_context[uart_num].spinlock));
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@@ -430,6 +430,24 @@ void uart_hal_get_sclk(uart_hal_context_t *hal, uart_sclk_t *sclk);
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*/
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void uart_hal_set_loop_back(uart_hal_context_t *hal, bool loop_back_en);
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/**
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* @brief Calculate uart symbol bit length, as defined in configuration.
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*
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* @param hw Beginning address of the peripheral registers.
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*
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* @return number of bits per UART symbol.
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*/
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uint8_t uart_hal_get_symb_len(uart_hal_context_t *hal);
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/**
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* @brief Get UART maximum timeout threshold.
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*
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* @param hw Beginning address of the peripheral registers.
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*
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* @return maximum timeout threshold value for target.
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*/
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uint16_t uart_hal_get_max_rx_timeout_thrd(uart_hal_context_t *hal);
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#ifdef __cplusplus
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}
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#endif
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#endif
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@@ -379,31 +379,6 @@ static inline void uart_ll_set_tx_idle_num(uart_dev_t *hw, uint32_t idle_num)
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hw->idle_conf.tx_idle_num = idle_num;
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}
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/**
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* @brief Configure the timeout value for receiver receiving a byte, and enable rx timeout function.
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*
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* @param hw Beginning address of the peripheral registers.
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* @param tout_thr The timeout value. The rx timeout function will be disabled if `tout_thr == 0`.
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*
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* @return None.
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*/
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static inline void uart_ll_set_rx_tout(uart_dev_t *hw, uint8_t tout_thr)
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{
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// The tout_thresh = 1, defines TOUT interrupt timeout equal to
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// transmission time of one symbol (~11 bit) on current baudrate
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if (hw->conf0.tick_ref_always_on == 0) {
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//Hardware issue workaround: when using ref_tick, the rx timeout threshold needs increase to 10 times.
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//T_ref = T_apb * APB_CLK/(REF_TICK << CLKDIV_FRAG_BIT_WIDTH)
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tout_thr = tout_thr * UART_LL_TOUT_REF_FACTOR_DEFAULT;
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}
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if(tout_thr > 0) {
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hw->conf1.rx_tout_thrhd = tout_thr;
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hw->conf1.rx_tout_en = 1;
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} else {
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hw->conf1.rx_tout_en = 0;
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}
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}
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/**
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* @brief Configure the transmiter to send break chars.
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*
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@@ -806,8 +781,52 @@ static inline void uart_ll_inverse_signal(uart_dev_t *hw, uint32_t inv_mask)
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hw->conf0.val = conf0_reg.val;
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}
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/**
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* @brief Configure the timeout value for receiver receiving a byte, and enable rx timeout function.
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*
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* @param hw Beginning address of the peripheral registers.
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* @param tout_thr The timeout value as a bit time. The rx timeout function will be disabled if `tout_thr == 0`.
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*
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* @return None.
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*/
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static inline void uart_ll_set_rx_tout(uart_dev_t *hw, uint16_t tout_thr)
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{
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if (hw->conf0.tick_ref_always_on == 0) {
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//Hardware issue workaround: when using ref_tick, the rx timeout threshold needs increase to 10 times.
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//T_ref = T_apb * APB_CLK/(REF_TICK << CLKDIV_FRAG_BIT_WIDTH)
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tout_thr = tout_thr * UART_LL_TOUT_REF_FACTOR_DEFAULT;
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} else {
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//If APB_CLK is used: counting rate is BAUD tick rate / 8
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tout_thr = (tout_thr + 7) / 8;
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}
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if (tout_thr > 0) {
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hw->conf1.rx_tout_thrhd = tout_thr;
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hw->conf1.rx_tout_en = 1;
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} else {
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hw->conf1.rx_tout_en = 0;
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}
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}
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/**
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* @brief Get UART maximum timeout threshold.
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*
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* @param hw Beginning address of the peripheral registers.
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*
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* @return maximum timeout threshold.
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*/
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static inline uint16_t uart_ll_max_tout_thrd(uart_dev_t *hw)
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{
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uint16_t tout_sym = 0;
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if (hw->conf0.tick_ref_always_on == 0) {
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tout_sym = (uint16_t)(UART_RX_TOUT_THRHD_V / UART_LL_TOUT_REF_FACTOR_DEFAULT);
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} else {
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tout_sym = (uint16_t)(UART_RX_TOUT_THRHD_V << 3);
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}
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return tout_sym;
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}
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#undef UART_LL_TOUT_REF_FACTOR_DEFAULT
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#ifdef __cplusplus
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}
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#endif
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#endif
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@@ -29,7 +29,6 @@ extern "C" {
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// Get UART hardware instance with giving uart num
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#define UART_LL_GET_HW(num) (((num) == 0) ? (&UART0) : (&UART1))
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// Define UART interrupts
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typedef enum {
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UART_INTR_RXFIFO_FULL = (0x1<<0),
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@@ -353,24 +352,6 @@ static inline void uart_ll_set_tx_idle_num(uart_dev_t *hw, uint32_t idle_num)
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hw->idle_conf.tx_idle_num = idle_num;
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}
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/**
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* @brief Configure the timeout value for receiver receiving a byte, and enable rx timeout function.
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*
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* @param hw Beginning address of the peripheral registers.
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* @param tout_thr The timeout value. The rx timeout function will be disabled if `tout_thr == 0`.
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*
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* @return None.
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*/
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static inline void uart_ll_set_rx_tout(uart_dev_t *hw, uint8_t tout_thr)
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{
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if(tout_thr > 0) {
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hw->mem_conf.rx_tout_thrhd = tout_thr;
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hw->conf1.rx_tout_en = 1;
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} else {
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hw->conf1.rx_tout_en = 0;
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}
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}
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/**
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* @brief Configure the transmiter to send break chars.
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*
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@@ -772,6 +753,37 @@ static inline void uart_ll_inverse_signal(uart_dev_t *hw, uint32_t inv_mask)
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hw->conf0.val = conf0_reg.val;
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}
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/**
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* @brief Configure the timeout value for receiver receiving a byte, and enable rx timeout function.
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*
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* @param hw Beginning address of the peripheral registers.
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* @param tout_thrd The timeout value as UART bit time. The rx timeout function will be disabled if `tout_thrd == 0`.
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*
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* @return None.
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*/
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static inline void uart_ll_set_rx_tout(uart_dev_t *hw, uint16_t tout_thrd)
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{
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uint16_t tout_val = tout_thrd;
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if(tout_thrd > 0) {
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hw->mem_conf.rx_tout_thrhd = tout_val;
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hw->conf1.rx_tout_en = 1;
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} else {
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hw->conf1.rx_tout_en = 0;
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}
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}
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/**
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* @brief Get UART maximum timeout threshold.
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*
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* @param hw Beginning address of the peripheral registers.
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*
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* @return maximum timeout threshold.
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*/
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static inline uint16_t uart_ll_max_tout_thrd(uart_dev_t *hw)
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{
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return UART_RX_TOUT_THRHD_V;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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@@ -76,11 +76,6 @@ void uart_hal_set_at_cmd_char(uart_hal_context_t *hal, uart_at_cmd_t *at_cmd)
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uart_ll_set_at_cmd_char(hal->dev, at_cmd);
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}
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void uart_hal_set_rx_timeout(uart_hal_context_t *hal, const uint8_t tout)
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{
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uart_ll_set_rx_tout(hal->dev, tout);
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}
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void uart_hal_get_sclk(uart_hal_context_t *hal, uart_sclk_t *sclk)
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{
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uart_ll_get_sclk(hal->dev, sclk);
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@@ -153,4 +148,32 @@ void uart_hal_init(uart_hal_context_t *hal, int uart_num)
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uart_ll_set_tx_idle_num(hal->dev, 0);
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// Disable hw-flow control
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uart_ll_set_hw_flow_ctrl(hal->dev, UART_HW_FLOWCTRL_DISABLE, 100);
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}
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}
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uint8_t uart_hal_get_symb_len(uart_hal_context_t *hal)
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{
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uint8_t symbol_len = 1; // number of bits per symbol including start
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uart_parity_t parity_mode;
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uart_stop_bits_t stop_bit;
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uart_word_length_t data_bit;
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uart_ll_get_data_bit_num(hal->dev, &data_bit);
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uart_ll_get_stop_bits(hal->dev, &stop_bit);
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uart_ll_get_parity(hal->dev, &parity_mode);
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symbol_len += (data_bit < UART_DATA_BITS_MAX) ? (uint8_t)data_bit + 5 : 8;
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symbol_len += (stop_bit > UART_STOP_BITS_1) ? 2 : 1;
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symbol_len += (parity_mode > UART_PARITY_DISABLE) ? 1 : 0;
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return symbol_len;
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}
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void uart_hal_set_rx_timeout(uart_hal_context_t *hal, const uint8_t tout)
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{
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uint8_t symb_len = uart_hal_get_symb_len(hal);
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uart_ll_set_rx_tout(hal->dev, symb_len * tout);
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}
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uint16_t uart_hal_get_max_rx_timeout_thrd(uart_hal_context_t *hal)
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{
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uint8_t symb_len = uart_hal_get_symb_len(hal);
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uint16_t max_tout_thresh = uart_ll_max_tout_thrd(hal->dev);
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return (max_tout_thresh / symb_len);
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}
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@@ -30,18 +30,18 @@ ESP32-WROVER-KIT | | RS-485 side | | SERIAL AD
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```
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#### Connect an external RS485 serial interface to an ESP32 board
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```
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----------------------------------------------------------------------
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| ESP32 Interface | #define | ESP32 Pin | External RS485 |
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| | | | Driver Pin |
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||||
| ----------------------|---------------|-----------|----------------|
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| Transmit Data (TxD) | ECHO_TEST_TXD | GPIO23 | DI |
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| Receive Data (RxD) | ECHO_TEST_RXD | GPIO22 | RO |
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| Request To Send (RTS) | ECHO_TEST_RTS | GPIO18 | ~RE/DE |
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| Ground | n/a | GND | GND |
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----------------------------------------------------------------------
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```
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Connect USB to RS485 adapter to computer and connect its D+, D- output lines with the D+, D- lines of RS485 line driver connected to ESP32 (See picture above).
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```
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--------------------------------------------------------------------------------------------------------------------------
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| ESP32 Interface | #define | Default ESP32 Pin | Default ESP32-S2 Pins | External RS485 Driver Pin |
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||||
| ----------------------|--------------------|-----------------------|-----------------------|---------------------------|
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||||
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | GPIO20 | DI |
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| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | GPIO19 | RO |
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| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | GPIO18 | ~RE/DE |
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| Ground | n/a | GND | GND | GND |
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--------------------------------------------------------------------------------------------------------------------------
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||||
```
|
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Note: The GPIO22 - GPIO25 can not be used with ESP32-S2 chip because they are used for flash chip connection. Please refer to UART documentation for selected target.
|
||||
|
||||
### Configure the project
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||||
```
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||||
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||||
@@ -0,0 +1,51 @@
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||||
menu "Echo RS485 Example Configuration"
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||||
|
||||
config ECHO_UART_PORT_NUM
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||||
int "UART port number"
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||||
range 0 2 if IDF_TARGET_ESP32
|
||||
range 0 1 if IDF_TARGET_ESP32S2
|
||||
default 2 if IDF_TARGET_ESP32
|
||||
default 1 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
UART communication port number for the example.
|
||||
See UART documentation for available port numbers.
|
||||
|
||||
config ECHO_UART_BAUD_RATE
|
||||
int "UART communication speed"
|
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range 1200 115200
|
||||
default 115200
|
||||
help
|
||||
UART communication speed for Modbus example.
|
||||
|
||||
config ECHO_UART_RXD
|
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int "UART RXD pin number"
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 22 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 19 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART RX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config ECHO_UART_TXD
|
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int "UART TXD pin number"
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 23 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 20 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART TX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config ECHO_UART_RTS
|
||||
int "UART RTS pin number"
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 18
|
||||
help
|
||||
GPIO number for UART RTS pin. This pin is connected to
|
||||
~RE/DE pin of RS485 transceiver to switch direction.
|
||||
See UART documentation for more information about available pin
|
||||
numbers for UART.
|
||||
|
||||
endmenu
|
||||
@@ -16,40 +16,44 @@
|
||||
#include "driver/uart.h"
|
||||
#include "freertos/queue.h"
|
||||
#include "esp_log.h"
|
||||
#include "sdkconfig.h"
|
||||
|
||||
/**
|
||||
* This is a example example which echos any data it receives on UART back to the sender.
|
||||
*
|
||||
* - port: UART2
|
||||
* - rx buffer: on
|
||||
* - tx buffer: off
|
||||
* - flow control: off
|
||||
*
|
||||
* This example has been tested on a 3 node RS485 Serial Bus
|
||||
*
|
||||
*/
|
||||
* This is a example which echos any data it receives on UART back to the sender using RS485 interface in half duplex mode.
|
||||
*/
|
||||
#define TAG "RS485_ECHO_APP"
|
||||
|
||||
// Note: UART2 default pins IO16, IO17 do not work on ESP32-WROVER module
|
||||
// because these pins connected to PSRAM
|
||||
#define ECHO_TEST_TXD (23)
|
||||
#define ECHO_TEST_RXD (22)
|
||||
// Note: Some pins on target chip cannot be assigned for UART communication.
|
||||
// Please refer to documentation for selected board and target to configure pins using Kconfig.
|
||||
#define ECHO_TEST_TXD (CONFIG_ECHO_UART_TXD)
|
||||
#define ECHO_TEST_RXD (CONFIG_ECHO_UART_RXD)
|
||||
|
||||
// RTS for RS485 Half-Duplex Mode manages DE/~RE
|
||||
#define ECHO_TEST_RTS (18)
|
||||
#define ECHO_TEST_RTS (CONFIG_ECHO_UART_RTS)
|
||||
|
||||
// CTS is not used in RS485 Half-Duplex Mode
|
||||
#define ECHO_TEST_CTS UART_PIN_NO_CHANGE
|
||||
#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
|
||||
|
||||
#define BUF_SIZE (127)
|
||||
#define BAUD_RATE (115200)
|
||||
#define BAUD_RATE (CONFIG_ECHO_UART_BAUD_RATE)
|
||||
|
||||
// Read packet timeout
|
||||
#define PACKET_READ_TICS (100 / portTICK_RATE_MS)
|
||||
#define ECHO_TASK_STACK_SIZE (2048)
|
||||
#define ECHO_TASK_PRIO (10)
|
||||
#define ECHO_UART_PORT (UART_NUM_MAX - 1)
|
||||
#define ECHO_UART_PORT (CONFIG_ECHO_UART_PORT_NUM)
|
||||
|
||||
static const char *TAG = "RS485_ECHO_APP";
|
||||
// Timeout threshold for UART = number of symbols (~10 tics) with unchanged state on receive pin
|
||||
#define ECHO_READ_TOUT (3) // 3.5T * 8 = 28 ticks, TOUT=3 -> ~24..33 ticks
|
||||
|
||||
static void echo_send(const int port, const char* str, uint8_t length)
|
||||
{
|
||||
if (uart_write_bytes(port, str, length) != length) {
|
||||
ESP_LOGE(TAG, "Send data critical failure.");
|
||||
// add your code to handle sending failure here
|
||||
abort();
|
||||
}
|
||||
}
|
||||
|
||||
// An example of echo test with hardware flow control on UART
|
||||
static void echo_task(void *arg)
|
||||
@@ -72,22 +76,27 @@ static void echo_task(void *arg)
|
||||
|
||||
// Install UART driver (we don't need an event queue here)
|
||||
// In this example we don't even use a buffer for sending data.
|
||||
uart_driver_install(uart_num, BUF_SIZE * 2, 0, 0, NULL, 0);
|
||||
ESP_ERROR_CHECK(uart_driver_install(uart_num, BUF_SIZE * 2, 0, 0, NULL, 0));
|
||||
|
||||
// Configure UART parameters
|
||||
uart_param_config(uart_num, &uart_config);
|
||||
ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config));
|
||||
|
||||
ESP_LOGI(TAG, "UART set pins, mode and install driver.");
|
||||
// Set UART1 pins(TX: IO23, RX: I022, RTS: IO18, CTS: IO19)
|
||||
uart_set_pin(uart_num, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS);
|
||||
|
||||
// Set UART pins as per KConfig settings
|
||||
ESP_ERROR_CHECK(uart_set_pin(uart_num, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS));
|
||||
|
||||
// Set RS485 half duplex mode
|
||||
uart_set_mode(uart_num, UART_MODE_RS485_HALF_DUPLEX);
|
||||
ESP_ERROR_CHECK(uart_set_mode(uart_num, UART_MODE_RS485_HALF_DUPLEX));
|
||||
|
||||
// Set read timeout of UART TOUT feature
|
||||
ESP_ERROR_CHECK(uart_set_rx_timeout(uart_num, ECHO_READ_TOUT));
|
||||
|
||||
// Allocate buffers for UART
|
||||
uint8_t* data = (uint8_t*) malloc(BUF_SIZE);
|
||||
|
||||
ESP_LOGI(TAG, "UART start recieve loop.\r\n");
|
||||
uart_write_bytes(uart_num, "Start RS485 UART test.\r\n", 24);
|
||||
echo_send(uart_num, "Start RS485 UART test.\r\n", 24);
|
||||
|
||||
while(1) {
|
||||
//Read data from UART
|
||||
@@ -95,27 +104,28 @@ static void echo_task(void *arg)
|
||||
|
||||
//Write data back to UART
|
||||
if (len > 0) {
|
||||
uart_write_bytes(uart_num, "\r\n", 2);
|
||||
echo_send(uart_num, "\r\n", 2);
|
||||
char prefix[] = "RS485 Received: [";
|
||||
uart_write_bytes(uart_num, prefix, (sizeof(prefix) - 1));
|
||||
|
||||
echo_send(uart_num, prefix, (sizeof(prefix) - 1));
|
||||
ESP_LOGI(TAG, "Received %u bytes:", len);
|
||||
printf("[ ");
|
||||
for (int i = 0; i < len; i++) {
|
||||
printf("0x%.2X ", (uint8_t)data[i]);
|
||||
uart_write_bytes(uart_num, (const char*)&data[i], 1);
|
||||
echo_send(uart_num, (const char*)&data[i], 1);
|
||||
// Add a Newline character if you get a return charater from paste (Paste tests multibyte receipt/buffer)
|
||||
if (data[i] == '\r') {
|
||||
uart_write_bytes(uart_num, "\n", 1);
|
||||
echo_send(uart_num, "\n", 1);
|
||||
}
|
||||
}
|
||||
printf("] \n");
|
||||
uart_write_bytes(uart_num, "]\r\n", 3);
|
||||
echo_send(uart_num, "]\r\n", 3);
|
||||
} else {
|
||||
// Echo a "." to show we are alive while we wait for input
|
||||
uart_write_bytes(uart_num, ".", 1);
|
||||
echo_send(uart_num, ".", 1);
|
||||
ESP_ERROR_CHECK(uart_wait_tx_done(uart_num, 10));
|
||||
}
|
||||
}
|
||||
vTaskDelete(NULL);
|
||||
}
|
||||
|
||||
void app_main(void)
|
||||
|
||||
@@ -2,8 +2,6 @@
|
||||
# in this exact order for cmake to work correctly
|
||||
cmake_minimum_required(VERSION 3.5)
|
||||
|
||||
set(SUPPORTED_TARGETS esp32)
|
||||
|
||||
set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/protocols/modbus/serial/mb_example_common)
|
||||
|
||||
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
|
||||
|
||||
@@ -91,18 +91,20 @@ idf.py menuconfig
|
||||
Configure the UART pins used for modbus communication using and table below.
|
||||
Define the communication mode parameter for master and slave in Kconfig - CONFIG_MB_COMM_MODE (must be the same for master and slave devices in one segment).
|
||||
Configure the slave address for each slave in the Modbus segment (the CONFIG_MB_SLAVE_ADDR in Kconfig).
|
||||
```
|
||||
--------------------------------------------------------------------------------------------------------------------------
|
||||
| ESP32 Interface | #define | Default ESP32 Pin | Default ESP32-S2 Pins | External RS485 Driver Pin |
|
||||
| ----------------------|--------------------|-----------------------|-----------------------|---------------------------|
|
||||
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | GPIO20 | DI |
|
||||
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | GPIO19 | RO |
|
||||
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | GPIO18 | ~RE/DE |
|
||||
| Ground | n/a | GND | GND | GND |
|
||||
--------------------------------------------------------------------------------------------------------------------------
|
||||
```
|
||||
Note: The GPIO22 - GPIO25 can not be used with ESP32-S2 chip because they are used for flash chip connection. Please refer to UART documentation for selected target.
|
||||
|
||||
Connect USB to RS485 adapter to computer and connect its D+, D- output lines with the D+, D- lines of RS485 line driver connected to ESP32 (See picture above).
|
||||
|
||||
```
|
||||
------------------------------------------------------------------------------------------------
|
||||
| ESP32 Interface | #define | Default ESP32 Pin | External RS485 Pin|
|
||||
| ----------------------|------------------------------|-------------------|-------------------|
|
||||
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | DI |
|
||||
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | RO |
|
||||
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | ~RE/DE |
|
||||
| | | | |
|
||||
| Ground | n/a | GND | GND |
|
||||
------------------------------------------------------------------------------------------------
|
||||
```
|
||||
The communication parameters of Modbus stack allow to configure it appropriately but usually it is enough to use default settings.
|
||||
See the help string of parameters for more information.
|
||||
|
||||
|
||||
@@ -2,8 +2,10 @@ menu "Modbus Example Configuration"
|
||||
|
||||
config MB_UART_PORT_NUM
|
||||
int "UART port number"
|
||||
range 0 2
|
||||
default 2
|
||||
range 0 2 if IDF_TARGET_ESP32
|
||||
default 2 if IDF_TARGET_ESP32
|
||||
range 0 1 if IDF_TARGET_ESP32S2
|
||||
default 1 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
UART communication port number for Modbus example.
|
||||
|
||||
@@ -16,27 +18,34 @@ menu "Modbus Example Configuration"
|
||||
|
||||
config MB_UART_RXD
|
||||
int "UART RXD pin number"
|
||||
range 0 34
|
||||
default 22
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 22 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 19 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART RX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config MB_UART_TXD
|
||||
int "UART TXD pin number"
|
||||
range 0 34
|
||||
default 23
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 23 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 20 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART TX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config MB_UART_RTS
|
||||
int "UART RTS pin number"
|
||||
range 0 34
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 18
|
||||
help
|
||||
GPIO number for UART RTS pin. This pin is connected to
|
||||
~RE/DE pin of RS485 transceiver to switch direction.
|
||||
See UART documentation for more information about available pin
|
||||
numbers for UART.
|
||||
|
||||
choice MB_COMM_MODE
|
||||
prompt "Modbus communication mode"
|
||||
|
||||
@@ -21,6 +21,9 @@
|
||||
#define MB_PORT_NUM (CONFIG_MB_UART_PORT_NUM) // Number of UART port used for Modbus connection
|
||||
#define MB_DEV_SPEED (CONFIG_MB_UART_BAUD_RATE) // The communication speed of the UART
|
||||
|
||||
// Note: Some pins on target chip cannot be assigned for UART communication.
|
||||
// See UART documentation for selected board and target to configure pins using Kconfig.
|
||||
|
||||
// The number of parameters that intended to be used in the particular control process
|
||||
#define MASTER_MAX_CIDS num_device_parameters
|
||||
|
||||
|
||||
@@ -1,7 +1,6 @@
|
||||
# The following lines of boilerplate have to be in your project's CMakeLists
|
||||
# in this exact order for cmake to work correctly
|
||||
cmake_minimum_required(VERSION 3.5)
|
||||
set(SUPPORTED_TARGETS esp32)
|
||||
|
||||
set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/protocols/modbus/serial/mb_example_common)
|
||||
|
||||
|
||||
@@ -42,15 +42,17 @@ idf.py menuconfig
|
||||
Select Modbus Example Configuration menu item.
|
||||
Configure the UART pins used for modbus communication using command and table below.
|
||||
```
|
||||
-----------------------------------------------------------------------------------
|
||||
| ESP32 Interface | #define | Default ESP32 Pin | External RS485 |
|
||||
| ----------------------|--------------------|-------------------| Driver Pin |
|
||||
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | DI |
|
||||
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | RO |
|
||||
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | ~RE/DE |
|
||||
| Ground | n/a | GND | GND |
|
||||
-----------------------------------------------------------------------------------
|
||||
--------------------------------------------------------------------------------------------------------------------------
|
||||
| ESP32 Interface | #define | Default ESP32 Pin | Default ESP32-S2 Pins | External RS485 Driver Pin |
|
||||
| ----------------------|--------------------|-----------------------|-----------------------|---------------------------|
|
||||
| Transmit Data (TxD) | CONFIG_MB_UART_TXD | GPIO23 | GPIO20 | DI |
|
||||
| Receive Data (RxD) | CONFIG_MB_UART_RXD | GPIO22 | GPIO19 | RO |
|
||||
| Request To Send (RTS) | CONFIG_MB_UART_RTS | GPIO18 | GPIO18 | ~RE/DE |
|
||||
| Ground | n/a | GND | GND | GND |
|
||||
--------------------------------------------------------------------------------------------------------------------------
|
||||
```
|
||||
Note: The GPIO22 - GPIO25 can not be used with ESP32-S2 chip because they are used for flash chip connection. Please refer to UART documentation for selected target.
|
||||
|
||||
Define the ```Modbus communiction mode``` for slave in Kconfig - CONFIG_MB_COMM_MODE (must be the same for master and slave application).
|
||||
Set ```Modbus slave address``` for the example application (by default for example script is set to 1).
|
||||
The communication parameters of freemodbus stack (Component config->Modbus configuration) allow to configure it appropriately but usually it is enough to use default settings.
|
||||
|
||||
@@ -2,8 +2,10 @@ menu "Modbus Example Configuration"
|
||||
|
||||
config MB_UART_PORT_NUM
|
||||
int "UART port number"
|
||||
range 0 2
|
||||
default 2
|
||||
range 0 2 if IDF_TARGET_ESP32
|
||||
default 2 if IDF_TARGET_ESP32
|
||||
range 0 1 if IDF_TARGET_ESP32S2
|
||||
default 1 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
UART communication port number for Modbus example.
|
||||
|
||||
@@ -16,27 +18,34 @@ menu "Modbus Example Configuration"
|
||||
|
||||
config MB_UART_RXD
|
||||
int "UART RXD pin number"
|
||||
range 0 34
|
||||
default 22
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 22 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 19 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART RX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config MB_UART_TXD
|
||||
int "UART TXD pin number"
|
||||
range 0 34
|
||||
default 23
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
default 23 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 20 if IDF_TARGET_ESP32S2
|
||||
help
|
||||
GPIO number for UART TX pin. See UART documentation for more information
|
||||
about available pin numbers for UART.
|
||||
|
||||
config MB_UART_RTS
|
||||
int "UART RTS pin number"
|
||||
range 0 34
|
||||
range 0 34 if IDF_TARGET_ESP32
|
||||
range 0 46 if IDF_TARGET_ESP32S2
|
||||
default 18
|
||||
help
|
||||
GPIO number for UART RTS pin. This pin is connected to
|
||||
~RE/DE pin of RS485 transceiver to switch direction.
|
||||
See UART documentation for more information about available pin
|
||||
numbers for UART.
|
||||
|
||||
choice MB_COMM_MODE
|
||||
prompt "Modbus communication mode"
|
||||
@@ -62,4 +71,5 @@ menu "Modbus Example Configuration"
|
||||
This is the Modbus slave address in the network.
|
||||
It is used to organize Modbus network with several slaves connected into the same segment.
|
||||
|
||||
|
||||
endmenu
|
||||
|
||||
@@ -16,6 +16,9 @@
|
||||
#define MB_SLAVE_ADDR (CONFIG_MB_SLAVE_ADDR) // The address of device in Modbus network
|
||||
#define MB_DEV_SPEED (CONFIG_MB_UART_BAUD_RATE) // The communication speed of the UART
|
||||
|
||||
// Note: Some pins on target chip cannot be assigned for UART communication.
|
||||
// Please refer to documentation for selected board and target to configure pins using Kconfig.
|
||||
|
||||
// Defines below are used to define register start address for each type of Modbus registers
|
||||
#define MB_REG_DISCRETE_INPUT_START (0x0000)
|
||||
#define MB_REG_INPUT_START (0x0000)
|
||||
|
||||
Reference in New Issue
Block a user