from: https://eroro.tistory.com/582
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 |
/* Includes ------------------------------------------------------------------*/ #include "usr_mcp4251.h" /* Private variables ---------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ void MCP4251_configuration(void) { SPI2_CE0_HIGH(); SPI2_CE1_HIGH(); DelayMs(10); SPIx_Init(SPI_2); } /* 00h - Volatile Wiper 0 Write Data 0000 00xx xxxx xxxx Read Data 0000 11xx xxxx xxxx Increment Wiper 0000 0100 Decrement Wiper 0000 1000 01h - Volatile Wiper 1 Write Data 0001 00xx xxxx xxxx Read Data 0001 11xx xxxx xxxx Increment Wiper 0001 0100 Decrement Wiper 0001 1000 02h - Reserved 03h - Reserved 04h - Volatile TCON Write Data 0100 00xx xxxx xxxx Read Data 0100 11xx xxxx xxxx 05h - Status Register Read Data 0101 11xx xxxx xxxx 06h ~ 0Fh - Reserved #define MCP4131_WRITE (0x00 << 2) #define MCP4131_READ (0x03 << 2) #define MCP4131_WIPER_SHIFT 4 int address = chan->channel << MCP4131_WIPER_SHIFT; --Write-- data->buf[0] = address << MCP4131_WIPER_SHIFT; data->buf[0] |= MCP4131_WRITE | (val >> 8); data->buf[1] = val & 0xFF; --Read-- data->buf[0] = (address << MCP4131_WIPER_SHIFT) | MCP4131_READ; data->buf[1] = 0; */ /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4251_Read(uint8_t ch, uint8_t Addr, uint8_t reg) { u32 SPITimeout = SPI_FLAG_TIMEOUT; if(ch == 1){ SPI2_CE0_LOW(); SPI2_CE0_HIGH(); } else{ SPI2_CE1_LOW(); SPI2_CE1_HIGH(); } return 0; } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 SPI_transfer(uint8_t reg) { u32 SPITimeout = SPI_FLAG_TIMEOUT; /* Loop while DR register in not emplty */ while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET){ if((SPITimeout--) == 0) return 1; } /* Send u8 through the SPI1 peripheral */ SPI_I2S_SendData(SPI2, (uint16_t)reg); return 0; } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ void MCP4251_DigitalPotWiperIncrement(u8 potNum) { u8 cmdu8 = 0x00; SPI2_CE0_LOW(); //CE 0 Low if (potNum){ cmdu8 = ADDRESS_WIPER_1 | COMMAND_INCREMENT; SPI_transfer(cmdu8); } else{ cmdu8 = ADDRESS_WIPER_0 | COMMAND_INCREMENT; SPI_transfer(cmdu8); } SPI2_CE0_HIGH(); //CE 0 High } void MCP4251_DigitalPotWiperDecrement(u8 potNum) { u8 cmdu8 = 0x00; SPI2_CE0_LOW(); //CE 0 Low if (potNum){ cmdu8 = ADDRESS_WIPER_1 | COMMAND_DECREMENT; SPI_transfer(cmdu8); } else{ cmdu8 = ADDRESS_WIPER_0 | COMMAND_DECREMENT; SPI_transfer(cmdu8); } SPI2_CE0_HIGH(); //CE 0 High } void MCP4251_DigitalPotSetWiperPosition(u8 potNum, u32 value) { u8 cmdu8 = 0x00; u8 datau8 = 0x00; if (value > 255) cmdu8 |= 0x01; else datau8 = (u8)(value & 0X00FF); SPI2_CE0_LOW(); //CE 0 Low DelayUs(10); if (potNum) { cmdu8 = cmdu8 | ADDRESS_WIPER_1 | COMMAND_WRITE; SPI_transfer(cmdu8); SPI_transfer(datau8); } else { cmdu8 = cmdu8 | ADDRESS_WIPER_0 | COMMAND_WRITE; SPI_transfer(cmdu8); SPI_transfer(datau8); } DelayUs(10); DEBUGPRINT("cmdu8 %d, datau8 %d\r\n", cmdu8, datau8 ); SPI2_CE0_HIGH(); //CE 0 High } void MCP4251_DigitalPotSetWiperMin(u8 potNum) { if (potNum) MCP4251_DigitalPotSetWiperPosition(1, 0); else MCP4251_DigitalPotSetWiperPosition(0, 0); } void MCP4251_DigitalPotSetWiperMax(u8 potNum) { if (potNum) MCP4251_DigitalPotSetWiperPosition(1, 256); else MCP4251_DigitalPotSetWiperPosition(0, 256); } void MCP4251_DigitalPotSetWiperMid(u8 potNum) { if (potNum) MCP4251_DigitalPotSetWiperPosition(1, 128); else MCP4251_DigitalPotSetWiperPosition(0, 128); } uint16_t MCP4251_DigitalPotReadWiperPosition(u8 potNum) { u8 cmdu8 = 0x00; u8 hu8 = 0x00; u8 lu8 = 0x00; SPI2_CE0_LOW(); //CE 0 Low if (potNum) { cmdu8 = ADDRESS_WIPER_1 | COMMAND_READ; hu8 = SPI_transfer(cmdu8); lu8 = SPI_transfer(DUMMY_DATA); } else { cmdu8 = ADDRESS_WIPER_0 | COMMAND_READ; hu8 = SPI_transfer(cmdu8); lu8 = SPI_transfer(DUMMY_DATA); } SPI2_CE0_HIGH(); //CE 0 High return ((uint16_t)hu8 << 8 | (uint16_t)lu8) & BITMASK_READ_DATA_REGISTER; } uint16_t MCP4251_DigitalPotReadStatusRegister() { u8 cmdu8 = 0x00; u8 hu8 = 0x00; u8 lu8 = 0x00; SPI2_CE0_LOW(); //CE 0 Low cmdu8 = ADDRESS_STATUS | COMMAND_READ; hu8 = SPI_transfer(cmdu8); lu8 = SPI_transfer(DUMMY_DATA); SPI2_CE0_HIGH(); //CE 0 High return ((uint16_t)hu8 << 8 | (uint16_t)lu8) & BITMASK_READ_DATA_REGISTER; } uint16_t MCP4251_DigitalPotReadTconRegister() { u8 cmdu8 = 0x00; u8 hu8 = 0x00; u8 lu8 = 0x00; SPI2_CE0_LOW(); //CE 0 Low cmdu8 = ADDRESS_TCON | COMMAND_READ; hu8 = SPI_transfer(cmdu8); lu8 = SPI_transfer(DUMMY_DATA); SPI2_CE0_HIGH(); //CE 0 High return ((uint16_t)hu8 << 8 | (uint16_t)lu8) & BITMASK_READ_DATA_REGISTER; } void MCP4251_DigitalPotWriteTconRegister(uint16_t value) { u8 cmdu8 = 0x00; u8 datau8 = 0x00; if (value > 255) cmdu8 |= 0x01; else datau8 = (u8)(value & 0X00FF); SPI2_CE0_LOW(); //CE 0 Low cmdu8 = cmdu8 | ADDRESS_TCON | COMMAND_WRITE; SPI_transfer(cmdu8); SPI_transfer(datau8); SPI2_CE0_HIGH(); //CE 0 High } void MCP4251_DigitalPotStartup(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 | BITMASK_POT1_STARTUP; else lu8 = lu8 | BITMASK_POT0_STARTUP; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotShutdown(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 & ~BITMASK_POT1_STARTUP; else lu8 = lu8 & ~BITMASK_POT0_STARTUP; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotTerminalBConnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 | BITMASK_POT1_B_TERMINAL_CONNECT; else lu8 = lu8 | BITMASK_POT0_B_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotTerminalBDisconnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 & ~BITMASK_POT1_B_TERMINAL_CONNECT; else lu8 = lu8 & ~BITMASK_POT0_B_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotTerminalAConnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 | BITMASK_POT1_A_TERMINAL_CONNECT; else lu8 = lu8 | BITMASK_POT0_A_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotTerminalADisconnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 & ~BITMASK_POT1_A_TERMINAL_CONNECT; else lu8 = lu8 & ~BITMASK_POT0_A_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotWiperConnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 | BITMASK_POT1_WIPER_TERMINAL_CONNECT; else lu8 = lu8 | BITMASK_POT0_WIPER_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotWiperDisconnect(u8 potNum) { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; if (potNum) lu8 = lu8 & ~BITMASK_POT1_WIPER_TERMINAL_CONNECT; else lu8 = lu8 & ~BITMASK_POT0_WIPER_TERMINAL_CONNECT; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } void MCP4251_DigitalPotInitTcon() { uint16_t tconData = MCP4251_DigitalPotReadTconRegister(); u8 hu8 = (uint8_t)tconData >> 8; u8 lu8 = (uint8_t)tconData & 0xff; lu8 = lu8 | DUMMY_DATA; tconData = (uint16_t)hu8 << 8 | (uint16_t)lu8; MCP4251_DigitalPotWriteTconRegister(tconData); } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4251_Test(void) { u8 i = 0; while(1){ for(i=0; i<=255; i++){ StatusLED1toggle(); StatusLED2toggle(); StatusLED3toggle(); StatusLED4toggle(); MCP4251_DigitalPotSetWiperPosition(1, i); DelayMs(1); } } return 0; } |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
#ifndef __USR_MCP4251_H #define __USR_MCP4251_H #include "main.h" /* Private define ------------------------------------------------------------*/ /* 8BIT COMMAND AD3 AC2 AD1 AD0 C1 C0 D9 D8 16BIT COMMAND AD3 AC2 AD1 AD0 C1 C0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 C1 C0 0 0 WRITE DATA 0 1 INCR 1 0 DECR 1 1 READ DATA */ #define ADDRESS_WIPER_0 0x00 #define ADDRESS_WIPER_1 0x10 #define ADDRESS_TCON 0x40 #define ADDRESS_STATUS 0x50 #define COMMAND_WRITE 0x00 #define COMMAND_INCREMENT 0x04 #define COMMAND_DECREMENT 0x08 #define COMMAND_READ 0x0C #define DUMMY_DATA 0xFF #define BITMASK_READ_DATA_REGISTER 0X01FF //B0000000111111111 #define TCON0OFF1ON 0xF0 #define TCON0ON1OFF 0x0F #define TCON0OFF1OFF 0x00 #define TCON0ON1ON 0xFF #define BITMASK_POT0_STARTUP 0x08 #define BITMASK_POT1_STARTUP 0x80 #define BITMASK_POT0_B_TERMINAL_CONNECT 0x01 #define BITMASK_POT1_B_TERMINAL_CONNECT 0x10 #define BITMASK_POT0_WIPER_TERMINAL_CONNECT 0x02 #define BITMASK_POT1_WIPER_TERMINAL_CONNECT 0x20 #define BITMASK_POT0_A_TERMINAL_CONNECT 0x04 #define BITMASK_POT1_A_TERMINAL_CONNECT 0x40 #define MCP4251_FLAG_TIMEOUT 0x1000 /* Private typedef -----------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Function define ------------------------------------------------------------*/ void MCP4251_configuration(void); u8 MCP4251_Write(uint8_t ch, uint8_t Addr, uint8_t reg); u8 MCP4251_Test(void); #endif //__USR_MCP4251_H |
——————————————————————————————————————–
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 |
/* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private variables ---------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ void MCP4716_configuration(void) { I2CBus_Init(I2C_1, 0x00, CLK_100kHZ); } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4716_WriteCMD(uint8_t ch, uint16_t reg) { if(ch == 1){ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A0_Address, I2C_Direction_Transmitter); //??MCP4726???? 0xc0 ?,0xc1 ? while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, reg); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } else{ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A3_Address, I2C_Direction_Transmitter); //??MCP4726???? 0xc0 ?,0xc1 ? while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, reg); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } return 0; } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4716_WriteDIG(uint8_t ch, uint16_t reg) { u8 data_H=0, data_L=0; data_H = ( 0x0F00 & reg) >> 8; data_L = 0X00FF & reg ; if(ch == 1){ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A0_Address, I2C_Direction_Transmitter); //??MCP4726???? 0xc0 ?,0xc1 ? while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, data_H); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_SendData(I2C1, data_L); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } else{ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A3_Address, I2C_Direction_Transmitter); //??MCP4726???? 0xc0 ?,0xc1 ? while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, data_H); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_SendData(I2C1, data_L); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } return 0; } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4716_WriteDAT_Voltage(uint8_t ch, uint16_t reg) { u8 temp = 0; u16 Dn = 0; if(reg >= 3300) reg = 3300; Dn = ( 4095 * reg) / 3300; temp = (0x0F00 & Dn) >> 8; if(ch == 1){ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A0_Address, I2C_Direction_Transmitter); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, temp); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_SendData(I2C1, Dn); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } else{ while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); /* Start */ I2C_GenerateSTART(I2C1, ENABLE); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); I2C_Send7bitAddress(I2C1, MCP4716A3_Address, I2C_Direction_Transmitter); while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); /* Send data */ I2C_SendData(I2C1, temp); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); I2C_SendData(I2C1, Dn); while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); /* Stop */ I2C_GenerateSTOP(I2C1, ENABLE); } return 0; } /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ u8 MCP4716_Test(void) { u16 i = 0; MCP4716_WriteCMD(1, 0x98); MCP4716_WriteCMD(2, 0x98); DelayMs(10); MCP4716_WriteDAT_Voltage(1, 3300); MCP4716_WriteDAT_Voltage(2, 3300); while(1) { for(i=0; i<=3301; i++){ StatusLED1toggle(); StatusLED2toggle(); StatusLED3toggle(); StatusLED4toggle(); MCP4716_WriteDAT_Voltage(1, i); MCP4716_WriteDAT_Voltage(2, i); // DelayUs(10000); } } } |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 |
#ifndef __USR_MCP4716_H #define __USR_MCP4716_H #include "main.h" /* Private define ------------------------------------------------------------*/ /* Private typedef -----------------------------------------------------------*/ /* Command Code VREF1 VREF0 PD1 PD0 G 1. Command C2 C1 C0 0 0 x Write Volatile DAC Register Command 0 1 0 Write Volatile Memory Command 0 1 1 Write All Memory Command 1 0 0 Write Volatile Configuration Bits Command 2. Resistor Ladder Voltage Reference (VRL) Selection bits 0x = VDD (Unbuffered) 10 = VREF pin (Unbuffered) 11 = VREF pin (Buffered) 3. Power-Down Selection bits When the DAC is powered down, most of the internal circuits are powered off and the op amp is disconnected from the VOUT pin. 00 = Not Powered Down (Normal operation) 01 = Powered Down – VOUT is loaded with 1 kO resistor to ground. 10 = Powered Down – VOUT is loaded with 100 kO resistor to ground. 11 = Powered Down – VOUT is loaded with 500 kO resistor to ground. 4. Gain Selection bit 0 = 1x (gain of 1) 1 = 2x (gain of 2). Not applicable when VDD is used as VRL VREF1 VREF0 PD1 PD0 G POR Event 0 0 0 0 0 When VDD transitions from VDD < VPOR to VDD > VPOR BOR Event 0 0 1 1 0 When VDD transitions from VDD > VBOR to VDD < VBOR DataSheet Block Diagram C2 C1 C0 VREF1 VREF0 PD1 PD0 G 1 0 0 1 1 0 0 0 => 0x98 Write Volatile Configuration Bits Command VREF pin (Buffered) => This Sche. DON'T CARE Not Powered Down (Normal operation) 1x (gain of 1) */ /* Private variables ---------------------------------------------------------*/ //Write 0, Read 1 #define MCP4716A0_Address 0xC0//1100 000x x = Read/Write #define MCP4716A1_Address 0xC2//1100 001x x = Read/Write #define MCP4716A2_Address 0xC4//1100 010x x = Read/Write #define MCP4716A3_Address 0xC6//1100 011x x = Read/Write #define MCP4716A4_Address 0xC8//1100 100x x = Read/Write #define MCP4716A5_Address 0xCA//1100 101x x = Read/Write #define MCP4716A6_Address 0xCC//1100 110x x = Read/Write #define MCP4716A7_Address 0xCE//1100 111x x = Read/Write #define MCP4716A0_ReadAddress MCP4716A0_Address|0x01//1100 000x x = Read/Write #define MCP4716A1_ReadAddress MCP4716A1_Address|0x01//1100 001x x = Read/Write #define MCP4716A2_ReadAddress MCP4716A2_Address|0x01//1100 010x x = Read/Write #define MCP4716A3_ReadAddress MCP4716A3_Address|0x01//1100 011x x = Read/Write #define MCP4716A4_ReadAddress MCP4716A4_Address|0x01//1100 100x x = Read/Write #define MCP4716A5_ReadAddress MCP4716A5_Address|0x01//1100 101x x = Read/Write #define MCP4716A6_ReadAddress MCP4716A6_Address|0x01//1100 110x x = Read/Write #define MCP4716A7_ReadAddress MCP4716A7_Address|0x01//1100 111x x = Read/Write /* Function define ------------------------------------------------------------*/ void MCP4716_configuration(void); u8 MCP4716_WriteCMD(uint8_t ch, uint16_t reg); u8 MCP4716_WriteDIG(uint8_t ch, uint16_t reg); u8 MCP4716_WriteDAT_Voltage(uint8_t ch, uint16_t reg); u8 MCP4716_Test(void); #endif //__USR_MCP4716_H |