These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
SPI/Slave/spi_slave.c
- Committer:
- frank26080115
- Date:
- 2011-03-20
- Revision:
- 0:bf7b9fba3924
File content as of revision 0:bf7b9fba3924:
/***********************************************************************//** * @file spi_slave.c * @purpose This example describes how to use SPI in slave mode * @version 2.0 * @date 21. May. 2010 * @author NXP MCU SW Application Team *--------------------------------------------------------------------- * Software that is described herein is for illustrative purposes only * which provides customers with programming information regarding the * products. This software is supplied "AS IS" without any warranties. * NXP Semiconductors assumes no responsibility or liability for the * use of the software, conveys no license or title under any patent, * copyright, or mask work right to the product. NXP Semiconductors * reserves the right to make changes in the software without * notification. NXP Semiconductors also make no representation or * warranty that such application will be suitable for the specified * use without further testing or modification. **********************************************************************/ #include "lpc17xx_spi.h" #include "lpc17xx_libcfg.h" #include "lpc17xx_pinsel.h" #include "debug_frmwrk.h" #include "lpc17xx_gpio.h" /* Example group ----------------------------------------------------------- */ /** @defgroup SPI_slave slave * @ingroup SPI_Examples * @{ */ /************************** PRIVATE DEFINITIONS ***********************/ /** Max buffer length */ #define BUFFER_SIZE 0x40 #define SPI_DATABIT_SIZE 10 /************************** PRIVATE VARIABLES *************************/ uint8_t menu1[] = "********************************************************************************\n\r" "Hello NXP Semiconductors \n\r" "SPI demo \n\r" "\t - MCU: LPC17xx \n\r" "\t - Core: ARM Cortex-M3 \n\r" "\t - Communicate via: UART0 - 115200bps \n\r" "\t An example of SPI using interrupt mode to test the SPI driver \n\r" " This example uses SPI in slave mode to communicate with SPI slave device \n\r" " The master and slave transfer together a number of data byte \n\r" "********************************************************************************\n\r"; uint8_t menu2[] = "Demo terminated! \n\r"; // SPI Configuration structure variable SPI_CFG_Type SPI_ConfigStruct; #if (SPI_DATABIT_SIZE == 8) uint8_t Tx_Buf[BUFFER_SIZE]; uint8_t Rx_Buf[BUFFER_SIZE]; #else uint16_t Tx_Buf[BUFFER_SIZE]; uint16_t Rx_Buf[BUFFER_SIZE]; #endif /************************** PRIVATE FUNCTIONS *************************/ void print_menu(void); void Buffer_Init(void); void Error_Loop(void); void Buffer_Verify(void); /*-------------------------PRIVATE FUNCTIONS------------------------------*/ /*********************************************************************//** * @brief Initialize buffer * @param[in] None * @return None **********************************************************************/ void Buffer_Init(void) { uint8_t i; #if (SPI_DATABIT_SIZE == 8) for (i = 0; i < BUFFER_SIZE; i++) { Tx_Buf[i] = i; Rx_Buf[i] = 0; } #else for (i = 0; i < BUFFER_SIZE/2; i++) { Tx_Buf[i] = i; Rx_Buf[i] = 0; } #endif } /*********************************************************************//** * @brief Error Loop (called by Buffer_Verify() if any error) * @param[in] none * @return None **********************************************************************/ void Error_Loop(void) { /* Loop forever */ while (1); } /*********************************************************************//** * @brief Verify buffer * @param[in] none * @return None **********************************************************************/ void Buffer_Verify(void) { uint8_t i; #if (DATA_SIZE==8) uint8_t *src_addr = (uint8_t *) &Tx_Buf[0]; uint8_t *dest_addr = (uint8_t *) &Rx_Buf[0]; for ( i = 0; i < SPI_DATABIT_SIZE; i++ ) { if ( *src_addr++ != *dest_addr++ ) { /* Call Error Loop */ _DBG_("Verify error"); Error_Loop(); } } #else uint16_t *src_addr = (uint16_t *) &Tx_Buf[0]; uint16_t *dest_addr = (uint16_t *) &Rx_Buf[0]; for ( i = 0; i < SPI_DATABIT_SIZE/2; i++ ) { if ( *src_addr++ != *dest_addr++ ) { /* Call Error Loop */ _DBG_("Verify error"); Error_Loop(); } } #endif } /*********************************************************************//** * @brief Print Welcome menu * @param[in] none * @return None **********************************************************************/ void print_menu(void) { _DBG(menu1); } /*-------------------------MAIN FUNCTION------------------------------*/ /*********************************************************************//** * @brief c_entry: Main SPI program body * @param[in] None * @return int **********************************************************************/ int c_entry(void) { PINSEL_CFG_Type PinCfg; SPI_DATA_SETUP_Type xferConfig; /* * Initialize SPI pin connect * P0.15 - SCK; * P0.16 - SSEL * P0.17 - MISO * P0.18 - MOSI */ PinCfg.Funcnum = 3; PinCfg.OpenDrain = 0; PinCfg.Pinmode = 0; PinCfg.Portnum = 0; PinCfg.Pinnum = 15; PINSEL_ConfigPin(&PinCfg); PinCfg.Pinnum = 17; PINSEL_ConfigPin(&PinCfg); PinCfg.Pinnum = 18; PINSEL_ConfigPin(&PinCfg); PinCfg.Pinnum = 16; PINSEL_ConfigPin(&PinCfg); /* Initialize debug via UART0 * 115200bps * 8 data bit * No parity * 1 stop bit * No flow control */ debug_frmwrk_init(); // print welcome screen print_menu(); SPI_ConfigStruct.CPHA = SPI_CPHA_SECOND; SPI_ConfigStruct.CPOL = SPI_CPOL_LO; SPI_ConfigStruct.ClockRate = 2000000; SPI_ConfigStruct.DataOrder = SPI_DATA_MSB_FIRST; SPI_ConfigStruct.Databit = SPI_DATABIT_SIZE; SPI_ConfigStruct.Mode = SPI_SLAVE_MODE; // Initialize SPI peripheral with parameter given in structure above SPI_Init(LPC_SPI, &SPI_ConfigStruct); /* Initialize Buffer */ _DBG("Init buffer..."); Buffer_Init(); _DBG_("Complete!"); _DBG_("Wait for master transfer data..."); xferConfig.tx_data = Tx_Buf; xferConfig.rx_data = Rx_Buf; xferConfig.length = BUFFER_SIZE; SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_POLLING); _DBG_("Transfer complete!"); // Verify buffer after transferring Buffer_Verify(); _DBG_("Verify complete!"); /* Loop forever */ SPI_DeInit(LPC_SPI); while(1); return 1; } /* With ARM and GHS toolsets, the entry point is main() - this will allow the linker to generate wrapper code to setup stacks, allocate heap area, and initialize and copy code and data segments. For GNU toolsets, the entry point is through __start() in the crt0_gnu.asm file, and that startup code will setup stacks and data */ int main(void) { return c_entry(); } #ifdef DEBUG /******************************************************************************* * @brief Reports the name of the source file and the source line number * where the CHECK_PARAM error has occurred. * @param[in] file Pointer to the source file name * @param[in] line assert_param error line source number * @return None *******************************************************************************/ void check_failed(uint8_t *file, uint32_t line) { /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* Infinite loop */ while(1); } #endif /* * @} */