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00097 #include "board.h"
00098
00099 #include <stdbool.h>
00100 #include <stdio.h>
00101 #include <string.h>
00102
00103
00104
00105
00106
00107
00108
00109
00110 #define PINS_USART_MASTER PIN_USART0_TXD, PIN_USART0_RXD, PIN_USART0_SCK, PIN_USART0_RTS
00111 #define PINS_USART_SLAVE PIN_USART0_TXD, PIN_USART0_RXD, PIN_USART0_SCK, PIN_USART0_CTS
00112
00113
00114 #define PINS_SPI0_MASTER PIN_SPI_MISO, PIN_SPI_MOSI, PIN_SPI_SPCK, PIN_SPI_NPCS1
00115 #define PINS_SPI0_SLAVE PIN_SPI_MISO, PIN_SPI_MOSI, PIN_SPI_SPCK, PIN_SPI_NPCS0
00116
00117
00118 #define USART USART0
00119 #define ID_USART ID_USART0
00120 #define USART_IRQn USART0_IRQn
00121 #define USART_Handler USART0_Handler
00122
00123
00124 #define SPI SPI0
00125 #define ID_SPI ID_SPI0
00126 #define SPI_IRQn SPI0_IRQn
00127 #define SPI_Handler SPI0_Handler
00128
00129
00130
00131
00132
00133
00134 char pTxBuffer1[] = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ\n\r"};
00135 char pTxBuffer2[] = {"abcdefghijklmnopqrstuvwxyz\n\r"};
00136
00137
00138 const Pin pins1[] = {PINS_USART_MASTER, PINS_SPI0_SLAVE};
00139 const Pin pins2[] = {PINS_USART_SLAVE, PINS_SPI0_MASTER};
00140
00141
00142 static uint32_t spiClock = 5000000;
00143
00144
00145 static uint32_t baudRate = 5000000;
00146
00147
00148
00149
00150
00151
00152
00153 void SPI_Handler(void)
00154 {
00155 SPI_GetStatus(SPI);
00156 printf("%c", (char) SPI_Read(SPI));
00157 }
00158
00159
00160
00161
00162 void USART_Handler(void)
00163 {
00164 volatile uint32_t status;
00165 status = USART_GetStatus(USART);
00166 if ((status & 0x1) == 1)
00167 printf("%c", USART_Read(USART, 0));
00168 }
00169
00170
00171
00172
00173
00174
00175
00176
00177
00178 static void USART_SPI_SetBaudrate(Usart *pUsart,
00179 uint32_t baudrate,
00180 uint32_t masterClock)
00181 {
00182 unsigned int CD, FP;
00183
00184
00185 CD = (masterClock / baudrate);
00186 FP = ((masterClock / baudrate) - CD);
00187
00188 pUsart->US_BRGR = (US_BRGR_CD(CD) | US_BRGR_FP(FP));
00189 }
00190
00191
00192
00193
00194
00195
00196
00197
00198
00199
00200 static void USART_SPI_Configure(Usart *pUsart,
00201 uint32_t mode,
00202 uint32_t baudrate,
00203 uint32_t masterClock)
00204 {
00205
00206
00207 pUsart->US_CR = US_CR_RSTRX | US_CR_RSTTX
00208 | US_CR_RXDIS | US_CR_TXDIS | US_CR_RSTSTA;
00209
00210 pUsart->US_IDR = 0xFFFFFFFF;
00211
00212
00213 USART_SPI_SetBaudrate(pUsart, baudrate, masterClock);
00214
00215
00216 pUsart->US_MR = mode;
00217
00218
00219 pUsart->US_CR = US_CR_RXEN | US_CR_TXEN;
00220
00221
00222
00223 #if ( defined (__GNUC__) && !defined (__SAMBA__) )
00224 setvbuf(stdout, (char *)NULL, _IONBF, 0);
00225 #endif
00226
00227 }
00228
00229
00230
00231
00232 static void _ConfigureSpiSlave( void )
00233 {
00234
00235 SPI_Configure(SPI, ID_SPI, SPI_PCS(0));
00236
00237 NVIC_ClearPendingIRQ(SPI_IRQn);
00238 NVIC_SetPriority(SPI_IRQn ,1);
00239 NVIC_EnableIRQ(SPI_IRQn);
00240 SPI_DisableIt(SPI, 0xffffffff);
00241
00242 SPI_ConfigureNPCS(SPI, 0, 0);
00243 }
00244
00245
00246
00247
00248 static void _ConfigureUsartAsSpiMaster(void)
00249 {
00250 uint32_t usartMode;
00251
00252
00253 usartMode = 0
00254 | US_MR_USART_MODE_SPI_MASTER
00255 | US_MR_USCLKS_MCK
00256 | US_MR_CHRL_8_BIT
00257 | US_SPI_BPMODE_1
00258 | US_MR_CLKO;
00259
00260 PMC_EnablePeripheral(ID_USART);
00261 USART_SPI_Configure(USART, usartMode, baudRate, BOARD_MCK);
00262
00263 NVIC_ClearPendingIRQ(USART_IRQn);
00264 NVIC_SetPriority(USART_IRQn ,1);
00265 NVIC_EnableIRQ(USART_IRQn);
00266 USART_DisableIt(USART, 0xffffffff);
00267 }
00268
00269
00270
00271
00272 static void _ConfigureSpiMaster(void)
00273 {
00274
00275 SPI_Configure(SPI, ID_SPI, (SPI_MR_MSTR | SPI_MR_MODFDIS | SPI_PCS(1)));
00276
00277 NVIC_ClearPendingIRQ(SPI_IRQn);
00278 NVIC_SetPriority(SPI_IRQn ,1);
00279 NVIC_EnableIRQ(SPI_IRQn);
00280 SPI_DisableIt(SPI, 0xffffffff);
00281
00282 SPI_ConfigureNPCS(SPI, 1,
00283 SPI_DLYBCT( 100, BOARD_MCK ) |
00284 SPI_DLYBS(100, BOARD_MCK) |
00285 SPI_SCBR( spiClock, BOARD_MCK) |
00286 SPI_CSR_BITS_8_BIT);
00287 }
00288
00289
00290
00291
00292 static void _ConfigureUsartAsSpiSlave(void)
00293 {
00294 uint32_t usartMode;
00295
00296
00297 usartMode = 0
00298 | US_MR_USART_MODE_SPI_SLAVE
00299 | US_MR_CHRL_8_BIT
00300 | US_SPI_BPMODE_1;
00301 PMC_EnablePeripheral(ID_USART);
00302 USART_SPI_Configure(USART, usartMode, spiClock, BOARD_MCK);
00303
00304 NVIC_ClearPendingIRQ(USART_IRQn);
00305 NVIC_SetPriority(USART_IRQn ,1);
00306 NVIC_EnableIRQ(USART_IRQn);
00307 USART_DisableIt(USART, 0xffffffff);
00308 }
00309
00310
00311
00312
00313 static void _DisplayMainmenu(void)
00314 {
00315 printf("\n\rMenu :\n\r");
00316 printf("------\n\r");
00317 printf(" - M: Configure USART as spi master\n\r");
00318 printf(" - S: Configure USART as spi slave\n\r");
00319 printf(" - H: Display this menu \n\r");
00320 }
00321
00322
00323
00324
00325
00326
00327
00328
00329
00330 extern int main(void)
00331 {
00332 uint8_t ucKey, i;
00333
00334
00335 WDT_Disable(WDT);
00336
00337 SCB_EnableICache();
00338 SCB_EnableDCache();
00339
00340
00341 TimeTick_Configure();
00342
00343
00344 printf("-- USART SPI Example %s --\n\r", SOFTPACK_VERSION);
00345 printf("-- %s\n\r", BOARD_NAME);
00346 printf("-- Compiled: %s %s With %s--\n\r", __DATE__, __TIME__, COMPILER_NAME);
00347
00348
00349 _DisplayMainmenu();
00350
00351 while (1) {
00352 ucKey = DBG_GetChar();
00353 switch (ucKey) {
00354
00355 case 'm':
00356 case 'M':
00357
00358 PIO_Configure(pins1, PIO_LISTSIZE(pins1));
00359
00360 _ConfigureUsartAsSpiMaster();
00361
00362
00363 _ConfigureSpiSlave();
00364 printf("-I- Configure USART as spi master ...\n\r");
00365 SPI_EnableIt(SPI, SPI_IER_RDRF);
00366 SPI_Enable(SPI);
00367
00368 USART_EnableIt(USART, UART_IER_RXRDY);
00369
00370 for (i = 0; (pTxBuffer1[i]!='\0' && pTxBuffer2[i]!='\0'); i++) {
00371 while ((SPI->SPI_SR & SPI_SR_TXEMPTY) == 0);
00372 SPI->SPI_TDR = ((uint16_t)pTxBuffer2[i]) | SPI_PCS( 0 );
00373 USART_Write( USART, pTxBuffer1[i], 0);
00374 }
00375 break;
00376
00377
00378 case 's':
00379 case 'S':
00380 printf("-I- Configure USART as spi slave...\n\r");
00381
00382 PIO_Configure(pins2, PIO_LISTSIZE(pins2));
00383
00384 _ConfigureUsartAsSpiSlave();
00385
00386 _ConfigureSpiMaster();
00387 USART_EnableIt(USART, UART_IER_RXRDY);
00388 SPI_EnableIt(SPI, SPI_IER_RDRF);
00389 SPI_Enable(SPI);
00390 for (i = 0; (pTxBuffer1[i]!='\0' && pTxBuffer2[i]!='\0'); i++) {
00391 USART_Write(USART, (uint16_t)pTxBuffer2[i], 0);
00392 SPI_Write( SPI, 1, (uint16_t)pTxBuffer1[i]);
00393 }
00394 break;
00395
00396 case 'h':
00397 case 'H':
00398 _DisplayMainmenu();
00399 break;
00400 }
00401 }
00402 }
00403