1 /** 2 * @file afe.h 3 * @brief Analog Front End (AFE) communications r 4 */ 5 6 /****************************************************************************** 7 * 8 * Copyright (C) 2022-2023 Maxim Integrated Products, Inc. (now owned by 9 * Analog Devices, Inc.), 10 * Copyright (C) 2023-2024 Analog Devices, Inc. 11 * 12 * Licensed under the Apache License, Version 2.0 (the "License"); 13 * you may not use this file except in compliance with the License. 14 * You may obtain a copy of the License at 15 * 16 * http://www.apache.org/licenses/LICENSE-2.0 17 * 18 * Unless required by applicable law or agreed to in writing, software 19 * distributed under the License is distributed on an "AS IS" BASIS, 20 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 21 * See the License for the specific language governing permissions and 22 * limitations under the License. 23 * 24 ******************************************************************************/ 25 26 #ifndef LIBRARIES_PERIPHDRIVERS_INCLUDE_MAX32675_HART_UART_H_ 27 #define LIBRARIES_PERIPHDRIVERS_INCLUDE_MAX32675_HART_UART_H_ 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 /***** Includes *******/ 34 #include "stdint.h" 35 #include "afe.h" 36 #include "afe_adc_zero_regs.h" 37 #include "afe_adc_one_regs.h" 38 #include "afe_dac_regs.h" 39 #include "afe_hart_regs.h" 40 #include "mxc_sys.h" 41 #include "mxc_assert.h" 42 43 /***** Definitions *****/ 44 #define NORMAL_HART_TRANSCEIVE_MODE 0 45 #define HART_TEST_MODE_TX_1200 1 46 #define HART_TEST_MODE_TX_2200 2 47 #define HART_TEST_MODE_EXTERNAL 3 48 49 /** TPDLL Communications Errors, based on Command Summary Specification 50 HCF-Spec099 Section 7.3.1 Table 10 Communication Status. */ 51 #define TPDLL_COMM_ERROR_INDICATOR 0x80 52 #define TPDLL_VERTICAL_PARITY_ERROR 0x40 53 #define TPDLL_OVERRUN_ERROR 0x20 54 #define TPDLL_FRAMING_ERROR 0x10 55 #define TPDLL_BUFFER_OVERFLOW_ERROR 0x02 56 57 /** SAP definitions */ 58 #define HART_STATE_IDLE 0 59 #define HART_STATE_TRANSMIT 1 60 #define HART_STATE_RECEIVE_ACTIVE 2 61 62 // Note: no flag in UARTn_INT_FL register map for buffer overflow since 63 // since its a SW error 64 #define UART_FLAG_BUFFER_OVERFLOW_ERROR 0x80 65 66 /** HART UART SAP Callback for RESET.confirm() */ 67 typedef void (*reset_confirm_callback_t)(void); 68 69 /** HART UART SAP callback for ENABLE.confirm(state) */ 70 typedef void (*enable_confirm_callback_t)(uint32_t); 71 72 /** HART UART SAP callback for ENABLE.Indicate(state) */ 73 typedef void (*enable_indicate_callback_t)(uint32_t); 74 75 /** HART UART SAP Callback for DATA.confirm(data) */ 76 typedef void (*data_confirm_callback_t)(uint8_t); 77 78 /** HART UART SAP Callback for DATA.Indicate(data) */ 79 typedef void (*data_indicate_callback_t)(uint8_t); 80 81 /** HART UART SAP Callback for Error.Indicate(status, data) */ 82 typedef void (*error_indicate_callback_t)(uint8_t, uint8_t); 83 84 /** HART UART Callbacks */ 85 typedef struct { 86 reset_confirm_callback_t reset_confirm_cb; /**< Callback function for RESET.confirm() */ 87 enable_confirm_callback_t enable_confirm_cb; /**< Callback function for ENABLE.confirm() */ 88 enable_indicate_callback_t enable_indicate_cb; /**< Callback function for ENABLE.Indicate() */ 89 data_confirm_callback_t data_confirm_cb; /**< Callback function for DATA.confirm() */ 90 data_indicate_callback_t data_indicate_cb; /**< Callback function for DATA.Indicate(data) */ 91 error_indicate_callback_t 92 error_indicate_cb; /**< Callback function for ERROR.Indicate(status, data) */ 93 } hart_uart_callbacks_t; 94 95 /***** Function Prototypes *****/ 96 /** 97 * @brief Setup UART connection to HART. 98 * @note Test mode is required for physical layer test to output constant bit 99 * frequencies. 100 * 101 * @param test_mode Select the test mode to run the HART. (Check Definitions) 102 * 103 * @return See \ref MXC_Error_Codes for a list of return codes. 104 */ 105 int hart_uart_setup(uint32_t test_mode); 106 107 /** 108 * @brief Set callbacks for HART Physical Layer SAPs. 109 * 110 * @param callbacks \ref hart_uart_callbacks_t Struct of callbacks for HART Physical Layer SAPs. 111 */ 112 void hart_uart_setup_saps(hart_uart_callbacks_t callbacks); 113 114 /** 115 * @brief Enable HART. 116 * 117 * @return See \ref MXC_Error_Codes for a list of return codes. 118 */ 119 int hart_uart_enable(void); 120 121 /** 122 * @brief Disable HART. 123 * 124 * @return See \ref MXC_Error_Codes for a list of return codes. 125 */ 126 int hart_uart_disable(void); 127 128 /** 129 * @brief Select HART transmission test at 1200 Hz. 130 */ 131 void hart_uart_test_transmit_1200(void); 132 133 /** 134 * @brief Select HART transmission test at 2200 Hz. 135 */ 136 void hart_uart_test_transmit_2200(void); 137 138 /** 139 * @brief Send data to HART, copies data into internal buffer and uses 140 * interrupts to handle transmission. Toggles RTS before and after. 141 * 142 * @param data The buffer of data to write 143 * @param length The number of bytes to write 144 * 145 * @return See \ref MXC_Error_Codes for a list of return codes. 146 */ 147 int hart_uart_send(uint8_t *data, uint32_t length); 148 149 /** 150 * @brief Check if current transmit packet is complete. This state is reset 151 * to 0 (false) on every call to \ref hart_uart_send, or \ref hart_uart_send_nonblocking 152 * 153 * @return 0 - transmission still active 154 * 1 - transmission completed 155 */ 156 int hart_uart_check_transmit_complete(void); 157 158 /** 159 * @brief Unload the data received from the HART. 160 * 161 * @param buffer The buffer to store data in 162 * @param *packet_length The number of bytes received 163 * @param *comm_errors Any communications error during reception 164 * 165 * @return See \ref MXC_Error_Codes for a list of return codes. 166 */ 167 int hart_uart_get_received_packet(uint8_t *buffer, uint32_t *packet_length, uint32_t *comm_errors); 168 169 /** 170 * @brief The processing function for HART UART interrupts. 171 * 172 * @note When using the HART UART, the application must call this 173 * function periodically. This can be done from within the UART interrupt 174 * handler or periodically by the application if UART interrupts are disabled. 175 */ 176 void hart_uart_handler(void); 177 178 /** 179 * @brief Set HART RTS pin to receive mode, usually for testing purposes. 180 * 181 */ 182 void hart_rts_receive_mode(void); 183 184 /** 185 * @brief Set HART RTS pin to transmit mode, usually for testing purposes. 186 * 187 */ 188 void hart_rts_transmit_mode(void); 189 190 /** 191 * @brief Enables the 4Mhz clock that drives HART state machine 192 * 193 */ 194 int hart_clock_enable(void); 195 196 /** 197 * @brief Disables the 4Mhz clock that drives HART state machine 198 * 199 */ 200 void hart_clock_disable(void); 201 202 /** 203 * @brief Disables then enables HART UART Physical Layer interface 204 * 205 */ 206 void hart_sap_reset_request(void); 207 208 /** 209 * @brief Adds data to transmit FIFO 210 * @param data Data to transmit 211 * 212 * @return See \ref MXC_Error_Codes for a list of return codes. 213 */ 214 int hart_sap_data_request(uint8_t data); 215 216 /** 217 * @brief Sets RTS state 218 * @param state State for RTS pin /ref HART_STATE_TRANSMIT /ref HART_STATE_RECEIVE 219 * 220 */ 221 void hart_sap_enable_request(uint32_t state); 222 223 /**@} end of group hart_uart */ 224 225 #ifdef __cplusplus 226 } 227 #endif 228 229 #endif // LIBRARIES_PERIPHDRIVERS_INCLUDE_MAX32675_HART_UART_H_ 230
