1 /***************************************************************************//**
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3 * @brief Low Energy Universal Asynchronous Receiver/Transmitter (LEUART)
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6 *******************************************************************************
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8 * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
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9 *******************************************************************************
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, subject to the following restrictions:
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15 * 1. The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software.
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17 * 2. Altered source versions must be plainly marked as such, and must not be
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18 * misrepresented as being the original software.
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19 * 3. This notice may not be removed or altered from any source distribution.
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21 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
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22 * obligation to support this Software. Silicon Labs is providing the
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23 * Software "AS IS", with no express or implied warranties of any kind,
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24 * including, but not limited to, any implied warranties of merchantability
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25 * or fitness for any particular purpose or warranties against infringement
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26 * of any proprietary rights of a third party.
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28 * Silicon Labs will not be liable for any consequential, incidental, or
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29 * special damages, or any other relief, or for any claim by any third party,
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30 * arising from your use of this Software.
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32 ******************************************************************************/
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35 #ifndef __SILICON_LABS_EM_LEUART_H_
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36 #define __SILICON_LABS_EM_LEUART_H_
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38 #include "em_device.h"
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39 #if defined(LEUART_COUNT) && (LEUART_COUNT > 0)
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41 #include <stdbool.h>
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47 /***************************************************************************//**
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48 * @addtogroup EM_Library
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50 ******************************************************************************/
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52 /***************************************************************************//**
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53 * @addtogroup LEUART
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55 ******************************************************************************/
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57 /*******************************************************************************
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58 ******************************** ENUMS ************************************
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59 ******************************************************************************/
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61 /** Databit selection. */
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64 leuartDatabits8 = LEUART_CTRL_DATABITS_EIGHT, /**< 8 databits. */
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65 leuartDatabits9 = LEUART_CTRL_DATABITS_NINE /**< 9 databits. */
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66 } LEUART_Databits_TypeDef;
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69 /** Enable selection. */
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72 /** Disable both receiver and transmitter. */
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73 leuartDisable = 0x0,
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75 /** Enable receiver only, transmitter disabled. */
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76 leuartEnableRx = LEUART_CMD_RXEN,
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78 /** Enable transmitter only, receiver disabled. */
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79 leuartEnableTx = LEUART_CMD_TXEN,
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81 /** Enable both receiver and transmitter. */
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82 leuartEnable = (LEUART_CMD_RXEN | LEUART_CMD_TXEN)
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83 } LEUART_Enable_TypeDef;
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86 /** Parity selection. */
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89 leuartNoParity = LEUART_CTRL_PARITY_NONE, /**< No parity. */
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90 leuartEvenParity = LEUART_CTRL_PARITY_EVEN, /**< Even parity. */
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91 leuartOddParity = LEUART_CTRL_PARITY_ODD /**< Odd parity. */
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92 } LEUART_Parity_TypeDef;
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95 /** Stopbits selection. */
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98 leuartStopbits1 = LEUART_CTRL_STOPBITS_ONE, /**< 1 stopbits. */
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99 leuartStopbits2 = LEUART_CTRL_STOPBITS_TWO /**< 2 stopbits. */
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100 } LEUART_Stopbits_TypeDef;
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103 /*******************************************************************************
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104 ******************************* STRUCTS ***********************************
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105 ******************************************************************************/
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107 /** Init structure. */
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110 /** Specifies whether TX and/or RX shall be enabled when init completed. */
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111 LEUART_Enable_TypeDef enable;
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114 * LEUART reference clock assumed when configuring baudrate setup. Set
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115 * it to 0 if currently configurated reference clock shall be used.
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119 /** Desired baudrate. */
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122 /** Number of databits in frame. */
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123 LEUART_Databits_TypeDef databits;
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125 /** Parity mode to use. */
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126 LEUART_Parity_TypeDef parity;
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128 /** Number of stopbits to use. */
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129 LEUART_Stopbits_TypeDef stopbits;
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130 } LEUART_Init_TypeDef;
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132 /** Default config for LEUART init structure. */
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133 #define LEUART_INIT_DEFAULT \
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134 { leuartEnable, /* Enable RX/TX when init completed. */ \
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135 0, /* Use current configured reference clock for configuring baudrate. */ \
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136 9600, /* 9600 bits/s. */ \
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137 leuartDatabits8, /* 8 databits. */ \
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138 leuartNoParity, /* No parity. */ \
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139 leuartStopbits1 /* 1 stopbit. */ \
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143 /*******************************************************************************
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144 ***************************** PROTOTYPES **********************************
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145 ******************************************************************************/
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147 uint32_t LEUART_BaudrateCalc(uint32_t refFreq, uint32_t clkdiv);
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148 uint32_t LEUART_BaudrateGet(LEUART_TypeDef *leuart);
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149 void LEUART_BaudrateSet(LEUART_TypeDef *leuart,
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151 uint32_t baudrate);
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152 void LEUART_Enable(LEUART_TypeDef *leuart, LEUART_Enable_TypeDef enable);
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153 void LEUART_FreezeEnable(LEUART_TypeDef *leuart, bool enable);
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154 void LEUART_Init(LEUART_TypeDef *leuart, LEUART_Init_TypeDef const *init);
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155 void LEUART_TxDmaInEM2Enable(LEUART_TypeDef *leuart, bool enable);
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156 void LEUART_RxDmaInEM2Enable(LEUART_TypeDef *leuart, bool enable);
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158 /***************************************************************************//**
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160 * Clear one or more pending LEUART interrupts.
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162 * @param[in] leuart
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163 * Pointer to LEUART peripheral register block.
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166 * Pending LEUART interrupt source to clear. Use a bitwise logic OR
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167 * combination of valid interrupt flags for the LEUART module (LEUART_IF_nnn).
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168 ******************************************************************************/
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169 __STATIC_INLINE void LEUART_IntClear(LEUART_TypeDef *leuart, uint32_t flags)
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171 leuart->IFC = flags;
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175 /***************************************************************************//**
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177 * Disable one or more LEUART interrupts.
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179 * @param[in] leuart
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180 * Pointer to LEUART peripheral register block.
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183 * LEUART interrupt sources to disable. Use a bitwise logic OR combination of
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184 * valid interrupt flags for the LEUART module (LEUART_IF_nnn).
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185 ******************************************************************************/
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186 __STATIC_INLINE void LEUART_IntDisable(LEUART_TypeDef *leuart, uint32_t flags)
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188 leuart->IEN &= ~(flags);
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192 /***************************************************************************//**
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194 * Enable one or more LEUART interrupts.
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197 * Depending on the use, a pending interrupt may already be set prior to
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198 * enabling the interrupt. Consider using LEUART_IntClear() prior to enabling
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199 * if such a pending interrupt should be ignored.
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201 * @param[in] leuart
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202 * Pointer to LEUART peripheral register block.
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205 * LEUART interrupt sources to enable. Use a bitwise logic OR combination of
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206 * valid interrupt flags for the LEUART module (LEUART_IF_nnn).
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207 ******************************************************************************/
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208 __STATIC_INLINE void LEUART_IntEnable(LEUART_TypeDef *leuart, uint32_t flags)
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210 leuart->IEN |= flags;
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214 /***************************************************************************//**
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216 * Get pending LEUART interrupt flags.
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219 * The event bits are not cleared by the use of this function.
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221 * @param[in] leuart
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222 * Pointer to LEUART peripheral register block.
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225 * LEUART interrupt sources pending. A bitwise logic OR combination of valid
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226 * interrupt flags for the LEUART module (LEUART_IF_nnn).
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227 ******************************************************************************/
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228 __STATIC_INLINE uint32_t LEUART_IntGet(LEUART_TypeDef *leuart)
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230 return(leuart->IF);
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234 /***************************************************************************//**
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236 * Get enabled and pending LEUART interrupt flags.
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237 * Useful for handling more interrupt sources in the same interrupt handler.
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239 * @param[in] leuart
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240 * Pointer to LEUART peripheral register block.
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243 * Interrupt flags are not cleared by the use of this function.
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246 * Pending and enabled LEUART interrupt sources.
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247 * The return value is the bitwise AND combination of
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248 * - the OR combination of enabled interrupt sources in LEUARTx_IEN_nnn
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249 * register (LEUARTx_IEN_nnn) and
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250 * - the OR combination of valid interrupt flags of the LEUART module
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251 * (LEUARTx_IF_nnn).
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252 ******************************************************************************/
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253 __STATIC_INLINE uint32_t LEUART_IntGetEnabled(LEUART_TypeDef *leuart)
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257 /* Store LEUARTx->IEN in temporary variable in order to define explicit order
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258 * of volatile accesses. */
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261 /* Bitwise AND of pending and enabled interrupts */
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262 return leuart->IF & tmp;
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266 /***************************************************************************//**
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268 * Set one or more pending LEUART interrupts from SW.
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270 * @param[in] leuart
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271 * Pointer to LEUART peripheral register block.
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274 * LEUART interrupt sources to set to pending. Use a bitwise logic OR
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275 * combination of valid interrupt flags for the LEUART module (LEUART_IF_nnn).
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276 ******************************************************************************/
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277 __STATIC_INLINE void LEUART_IntSet(LEUART_TypeDef *leuart, uint32_t flags)
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279 leuart->IFS = flags;
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283 /***************************************************************************//**
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285 * Get LEUART STATUS register.
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287 * @param[in] leuart
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288 * Pointer to LEUART peripheral register block.
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291 * STATUS register value.
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293 ******************************************************************************/
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294 __STATIC_INLINE uint32_t LEUART_StatusGet(LEUART_TypeDef *leuart)
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296 return leuart->STATUS;
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299 void LEUART_Reset(LEUART_TypeDef *leuart);
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300 uint8_t LEUART_Rx(LEUART_TypeDef *leuart);
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301 uint16_t LEUART_RxExt(LEUART_TypeDef *leuart);
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302 void LEUART_Tx(LEUART_TypeDef *leuart, uint8_t data);
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303 void LEUART_TxExt(LEUART_TypeDef *leuart, uint16_t data);
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306 /***************************************************************************//**
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308 * Receive one 8 bit frame, (or part of a 9 bit frame).
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311 * This function is used to quickly receive one 8 bit frame by reading the
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312 * RXDATA register directly, without checking the STATUS register for the
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313 * RXDATAV flag. This can be useful from the RXDATAV interrupt handler,
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314 * i.e. waiting is superfluous, in order to quickly read the received data.
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315 * Please refer to @ref LEUART_RxDataXGet() for reception of 9 bit frames.
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318 * Since this function does not check whether the RXDATA register actually
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319 * holds valid data, it should only be used in situations when it is certain
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320 * that there is valid data, ensured by some external program routine, e.g.
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321 * like when handling an RXDATAV interrupt. The @ref LEUART_Rx() is normally a
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322 * better choice if the validity of the RXDATA register is not certain.
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325 * Notice that possible parity/stop bits are not
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326 * considered part of specified frame bit length.
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328 * @param[in] leuart
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329 * Pointer to LEUART peripheral register block.
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333 ******************************************************************************/
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334 __STATIC_INLINE uint8_t LEUART_RxDataGet(LEUART_TypeDef *leuart)
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336 return (uint8_t) (leuart->RXDATA);
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340 /***************************************************************************//**
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342 * Receive one 8-9 bit frame, with extended information.
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345 * This function is used to quickly receive one 8-9 bit frame with extended
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346 * information by reading the RXDATAX register directly, without checking the
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347 * STATUS register for the RXDATAV flag. This can be useful from the RXDATAV
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348 * interrupt handler, i.e. waiting is superfluous, in order to quickly read
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349 * the received data.
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352 * Since this function does not check whether the RXDATAX register actually
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353 * holds valid data, it should only be used in situations when it is certain
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354 * that there is valid data, ensured by some external program routine, e.g.
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355 * like when handling an RXDATAV interrupt. The @ref LEUART_RxExt() is normally
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356 * a better choice if the validity of the RXDATAX register is not certain.
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359 * Notice that possible parity/stop bits are not
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360 * considered part of specified frame bit length.
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362 * @param[in] leuart
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363 * Pointer to LEUART peripheral register block.
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367 ******************************************************************************/
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368 __STATIC_INLINE uint16_t LEUART_RxDataXGet(LEUART_TypeDef *leuart)
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370 return (uint16_t) (leuart->RXDATAX);
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374 /** @} (end addtogroup LEUART) */
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375 /** @} (end addtogroup EM_Library) */
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381 #endif /* defined(LEUART_COUNT) && (LEUART_COUNT > 0) */
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383 #endif /* __SILICON_LABS_EM_LEUART_H_ */
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