These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Diff: SPI/sc16is750_int/spi_interrupt_test.c
- Revision:
- 0:bf7b9fba3924
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SPI/sc16is750_int/spi_interrupt_test.c Sun Mar 20 05:38:56 2011 +0000 @@ -0,0 +1,367 @@ +/***********************************************************************//** + * @file spi_interrupt_test.c + * @purpose This example describes how to use SPI at mode SPI master/8bit + * on LPC1768 to communicate with SC16IS750/760 Demo board + * in interrupt 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_sc16is750_int sc16is750_int + * @ingroup SPI_Examples + * @{ + */ + +/************************** PRIVATE DEFINTIONS *********************/ +// PORT number that /CS pin assigned on +#define CS_PORT_NUM 0 +// PIN number that /CS pin assigned on +#define CS_PIN_NUM 16 + +/* Idle char */ +#define IDLE_CHAR 0xFF + +// Define macro used in command when using SPI with SC16IS740 +#define SC16IS740_WR_CMD(x) ((uint8_t) (x << 3)) +#define SC16IS740_RD_CMD(x) ((uint8_t) ((x << 3) | 0x80)) + +// Define register address of SC16IS740 +#define SC16IS740_IODIR_REG 0x0A +#define SC16IS740_IOSTATE_REG 0x0B +#define SC16IS740_IOCON_REG 0x0E + +/************************** 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" +" Communicate with SPI function on SC16IS750/760 Demo Board\n\r" +" Use IO function on SC16IS740/750/760 chip to turn ON/OFF LEDs\n\r" +"Press '1' to turn ON LEDs, '2' to turn OFF LEDs \n\r" +"********************************************************************************\n\r"; +uint8_t menu2[] = "Demo terminated! \n\r"; + +uint8_t iocon_cfg[2] = {SC16IS740_WR_CMD(SC16IS740_IOCON_REG), 0x00}; +uint8_t iodir_cfg[2] = {SC16IS740_WR_CMD(SC16IS740_IODIR_REG), 0xFF}; +uint8_t iostate_on[2] = {SC16IS740_WR_CMD(SC16IS740_IOSTATE_REG), 0x00}; +uint8_t iostate_off[2] = {SC16IS740_WR_CMD(SC16IS740_IOSTATE_REG), 0xFF}; +uint8_t spireadbuf[2]; + +/* Status Flag indicates current SPI transmission complete or not */ +__IO FlagStatus complete; + +// SPI Configuration structure variable +SPI_CFG_Type SPI_ConfigStruct; +// SPI Data Setup structure variable +SPI_DATA_SETUP_Type xferConfig; + + +/************************** PRIVATE FUNCTIONS *************************/ +void SPI_IRQHandler(void); + +void CS_Init(void); +void CS_Force(int32_t state); +void print_menu(void); + +/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/ +/*********************************************************************//** + * @brief SPI Interrupt used for reading and writing handler + * @param None + * @return None + ***********************************************************************/ +void SPI_IRQHandler(void) +{ + SPI_DATA_SETUP_Type *xf_setup; + uint16_t tmp; + uint8_t dataword; + + xf_setup = &xferConfig; + + if(SPI_GetDataSize(LPC_SPI) == 8) + dataword = 0; + else dataword = 1; + + /* Dummy read to clear SPI interrupt flag */ + SPI_ClearIntPending(LPC_SPI); + + // save status + tmp = SPI_GetStatus(LPC_SPI); + xf_setup->status = tmp; + // Check for error + if (tmp & (SPI_SPSR_ABRT | SPI_SPSR_MODF | SPI_SPSR_ROVR | SPI_SPSR_WCOL)){ + xf_setup->status |= SPI_STAT_ERROR; + // Disable Interrupt and call call-back + SPI_IntCmd(LPC_SPI, DISABLE); + // Set Complete Flag + complete = SET; + return; + } + + /* Check SPI complete flag */ + if (tmp & SPI_SPSR_SPIF){ + // Read data from SPI data + tmp = SPI_ReceiveData(LPC_SPI); + if (xf_setup->rx_data != NULL) + { + if (dataword == 0){ + *(uint8_t *)((uint8_t *)(xf_setup->rx_data) + xf_setup->counter) = (uint8_t) tmp; + } else { + *(uint16_t *)((uint8_t *)(xf_setup->rx_data) + xf_setup->counter) = (uint8_t) tmp; + } + } + // Increase counter + if (dataword == 0){ + xf_setup->counter++; + } else { + xf_setup->counter += 2; + } + } + + if (xf_setup->counter < xf_setup->length){ + // Write data to buffer + if(xf_setup->tx_data == NULL){ + if (dataword == 0){ + SPI_SendData(LPC_SPI, 0xFF); + } else { + SPI_SendData(LPC_SPI, 0xFFFF); + } + } else { + if (dataword == 0){ + SPI_SendData(LPC_SPI, (*(uint8_t *)((uint8_t *)(xf_setup->tx_data) + xf_setup->counter))); + } else { + SPI_SendData(LPC_SPI, (*(uint16_t *)((uint8_t *)(xf_setup->tx_data) + xf_setup->counter))); + } + } + } + // No more data to send + else { + xf_setup->status |= SPI_STAT_DONE; + // Disable Interrupt and call call-back + SPI_IntCmd(LPC_SPI, DISABLE); + // Set Complete Flag + complete = SET; + } +} + +/*-------------------------PRIVATE FUNCTIONS------------------------------*/ +/*********************************************************************//** + * @brief Initialize CS pin as GPIO function to drive /CS pin + * due to definition of CS_PORT_NUM and CS_PORT_NUM + * @param None + * @return None + ***********************************************************************/ +void CS_Init(void) +{ + GPIO_SetDir(CS_PORT_NUM, (1<<CS_PIN_NUM), 1); + GPIO_SetValue(CS_PORT_NUM, (1<<CS_PIN_NUM)); +} + + +/*********************************************************************//** + * @brief Drive CS output pin to low/high level to select slave device + * via /CS pin state + * @param[in] state State of CS output pin that will be driven: + * - 0: Drive CS pin to low level + * - 1: Drive CS pin to high level + * @return None + ***********************************************************************/ +void CS_Force(int32_t state) +{ + if (state){ + GPIO_SetValue(CS_PORT_NUM, (1<<CS_PIN_NUM)); + }else{ + GPIO_ClearValue(CS_PORT_NUM, (1<<CS_PIN_NUM)); + } +} + + +/*********************************************************************//** + * @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) +{ + uint8_t tmpchar[2] = {0, 0}; + PINSEL_CFG_Type PinCfg; + __IO FlagStatus exitflag; + + /* + * Initialize SPI pin connect + * P0.15 - SCK; + * P0.16 - SSEL - used as GPIO + * 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; + PinCfg.Funcnum = 0; + 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(); + + // initialize SPI configuration structure to default + SPI_ConfigStructInit(&SPI_ConfigStruct); + // Initialize SPI peripheral with parameter given in structure above + SPI_Init(LPC_SPI, &SPI_ConfigStruct); + + // Initialize /CS pin to GPIO function + CS_Init(); + + /* preemption = 1, sub-priority = 1 */ + NVIC_SetPriority(SPI_IRQn, ((0x01<<3)|0x01)); + /* Enable SSP0 interrupt */ + NVIC_EnableIRQ(SPI_IRQn); + + /* First, send some command to reset SC16IS740 chip via SPI bus interface + * note driver /CS pin to low state before transferring by CS_Enable() function + */ + complete = RESET; + CS_Force(0); + xferConfig.tx_data = iocon_cfg; + xferConfig.rx_data = spireadbuf; + xferConfig.length = sizeof (iocon_cfg); + SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_INTERRUPT); + while (complete == RESET); + CS_Force(1); + + complete = RESET; + CS_Force(0); + xferConfig.tx_data = iodir_cfg; + xferConfig.rx_data = spireadbuf; + xferConfig.length = sizeof (iodir_cfg); + SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_INTERRUPT); + while (complete == RESET); + CS_Force(1); + + // Reset exit flag + exitflag = RESET; + + // Start to use SPI polling mode + /* Read some data from the buffer */ + while (exitflag == RESET) + { + while((tmpchar[0] = _DG) == 0); + + if (tmpchar[0] == 27){ + /* ESC key, set exit flag */ + _DBG_(menu2); + exitflag = SET; + } + else if (tmpchar[0] == 'r'){ + print_menu(); + } else { + if (tmpchar[0] == '1') + { + // LEDs are ON now... + CS_Force(0); + xferConfig.tx_data = iostate_on; + xferConfig.rx_data = spireadbuf; + xferConfig.length = sizeof (iostate_on); + SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_POLLING); + CS_Force(1); + } + else if (tmpchar[0] == '2') + { + // LEDs are OFF now... + CS_Force(0); + xferConfig.tx_data = iostate_off; + xferConfig.rx_data = spireadbuf; + xferConfig.length = sizeof (iostate_off); + SPI_ReadWrite(LPC_SPI, &xferConfig, SPI_TRANSFER_POLLING); + CS_Force(1); + } + /* Then Echo it back */ + _DBG_(tmpchar); + } + } + // DeInitialize UART0 peripheral + SPI_DeInit(LPC_SPI); + /* Loop forever */ + 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 + +/* + * @} + */