These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Diff: UART/RS485_Slave/rs485_slave.c
- Revision:
- 0:bf7b9fba3924
diff -r 000000000000 -r bf7b9fba3924 UART/RS485_Slave/rs485_slave.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/UART/RS485_Slave/rs485_slave.c Sun Mar 20 05:38:56 2011 +0000 @@ -0,0 +1,568 @@ +/***********************************************************************//** + * @file rs485_slave.c + * @purpose This example used to test RS485 functionality on UART1 of + * LPC1768.In this case, RS485 function on UART1 acts as SLave + * on RS485 bus. + * @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_uart.h" +#include "lpc17xx_libcfg.h" +#include "lpc17xx_pinsel.h" + +/* Example group ----------------------------------------------------------- */ +/** @defgroup UART_RS485_Slave RS485_Slave + * @ingroup UART_Examples + * @{ + */ + +/************************** PRIVATE DEFINITIONS *************************/ +/* + * These following defines can be modified: + * - RECEIVER_ALWAYS_EN (0/1) + * - AUTO_SLVADDR_DETECT (0/1) in case RECEIVER_ALWAYS_EN is set to 0 + */ + +/* Receiver always be enabled to receive any data frame on RS485 bus, + * regardless that frame is data frame or slave address frame (9-bit). + * - When receiving a data frame, slave will display that data frame content + * via UART0. + * - When receiving a slave address frame (9bit mode), line error interrupt + * - 0: Receiver is not always enabled, only slave address frame can trigger + * an interrupt event to allow slave handle. + * - 1: Receiver always be enabled */ +#define RECEIVER_ALWAYS_EN 0 + + +#if (RECEIVER_ALWAYS_EN == 0) +/* Enable/Disable Auto Slave Address Detection + * - In case of '0': any received data bytes will be ignored and will not + * be stored in the RXFIFO. When an address byte is detected (parity bit + * = '1') it will be placed into the RXFIFO and an Rx Data Ready Interrupt + * will be generated. The interrupt handler can then read the address byte + * and decide whether or not to enable the receiver to accept the following data. + * - In case of '1': any received byte will be discarded if it is either a + * data byte OR an address byte which fails to match the slave address configured + * when initializing RS485. When a matching address character is detected it will + * be pushed onto the RXFIFO along with the parity bit, and the receiver will + * be automatically enabled (RS485CTRL bit 1 will be cleared by hardware). + * The receiver will also generate an Rx Data Ready Interrupt */ +#define AUTO_SLVADDR_DETECT 1 +#define SLAVE_ADDR 'A' +#endif + +/* buffer size definition */ +#define UART_RING_BUFSIZE 256 + +/* Buf mask */ +#define __BUF_MASK (UART_RING_BUFSIZE-1) +/* Check buf is full or not */ +#define __BUF_IS_FULL(head, tail) ((tail&__BUF_MASK)==((head+1)&__BUF_MASK)) +/* Check buf will be full in next receiving or not */ +#define __BUF_WILL_FULL(head, tail) ((tail&__BUF_MASK)==((head+2)&__BUF_MASK)) +/* Check buf is empty */ +#define __BUF_IS_EMPTY(head, tail) ((head&__BUF_MASK)==(tail&__BUF_MASK)) +/* Reset buf */ +#define __BUF_RESET(bufidx) (bufidx=0) +#define __BUF_INCR(bufidx) (bufidx=(bufidx+1)&__BUF_MASK) + +/************************** PRIVATE TYPES *************************/ +/** @brief UART Ring buffer structure */ +typedef struct +{ + __IO uint32_t tx_head; /*!< UART Tx ring buffer head index */ + __IO uint32_t tx_tail; /*!< UART Tx ring buffer tail index */ + __IO uint32_t rx_head; /*!< UART Rx ring buffer head index */ + __IO uint32_t rx_tail; /*!< UART Rx ring buffer tail index */ + __IO uint8_t tx[UART_RING_BUFSIZE]; /*!< UART Tx data ring buffer */ + __IO uint8_t rx[UART_RING_BUFSIZE]; /*!< UART Rx data ring buffer */ +} UART_RING_BUFFER_T; + +/************************** PRIVATE VARIABLES *************************/ +#if (RECEIVER_ALWAYS_EN) +uint8_t menu1[] = +"Hello NXP Semiconductors \n\r" \ +"RS485 demo in Slave mode \n\r" \ +"Slave's Receiver always enabled \n\r"; +#else +#if (AUTO_SLVADDR_DETECT == 0) +uint8_t menu1[] = +"Hello NXP Semiconductors \n\r" \ +"RS485 demo in Slave mode \n\r" \ +"Slave's Receiver is not always enabled - Auto Address Detection is disabled\n\r"; +#else +uint8_t menu1[] = +"Hello NXP Semiconductors \n\r" \ +"RS485 demo in Slave mode \n\r" \ +"Slave's Receiver is not always enabled - Auto Address Detection is enabled\n\r"; +#endif +#endif + +uint8_t send_msg[] = "Sending... \n\r"; +uint8_t recv_msg[] = "Receive: "; +uint8_t p_err_menu[] = "Parity error"; +uint8_t addr_menu[] = " - Slv Addr Frm received\n\r"; +uint8_t addr_acc[] = " - Slave Addr accepted\n\r"; +uint8_t addr_una[] = " - Slave Addr unaccepted\n\r"; +uint8_t addr_auto[] = "Slave Addr detected!\n\r"; +uint8_t f_err_menu[] = "Frame error \n\r"; +uint8_t nextline[] = "\n\r"; + +uint8_t ack_msg[] = "ACK"; +uint8_t terminator = 13; + +// UART Ring buffer +UART_RING_BUFFER_T rb; + +/************************** PRIVATE FUNCTIONS *************************/ +void UART1_IRQHandler(void); +void UART_IntReceive(void); +void UART_IntErr(uint8_t bLSErrType); + +uint32_t UARTReceive(LPC_UART_TypeDef *UARTPort, uint8_t *rxbuf, uint8_t buflen); +void print_menu(void); + +/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/ +/*********************************************************************//** + * @brief UART1 interrupt handler sub-routine + * @param[in] None + * @return None + **********************************************************************/ +void UART1_IRQHandler(void) +{ + // Call Standard UART 0 interrupt handler + uint32_t intsrc, tmp, tmp1; + + /* Determine the interrupt source */ + intsrc = UART_GetIntId(LPC_UART0); + tmp = intsrc & UART_IIR_INTID_MASK; + + // Receive Line Status + if (tmp == UART_IIR_INTID_RLS){ + // Check line status + tmp1 = UART_GetLineStatus(LPC_UART0); + // Mask out the Receive Ready and Transmit Holding empty status + tmp1 &= (UART_LSR_OE | UART_LSR_PE | UART_LSR_FE \ + | UART_LSR_BI | UART_LSR_RXFE); + // If any error exist + if (tmp1) { + UART_IntErr(tmp1); + } + } + + // Receive Data Available or Character time-out + if ((tmp == UART_IIR_INTID_RDA) || (tmp == UART_IIR_INTID_CTI)){ + UART_IntReceive(); + } +} + + +/********************************************************************//** + * @brief UART receive function (ring buffer used) + * @param[in] None + * @return None + *********************************************************************/ +void UART_IntReceive(void) +{ + +#if (RECEIVER_ALWAYS_EN) + uint8_t tmpc; + uint32_t rLen; + + while(1){ + // Call UART read function in UART driver + rLen = UART_Receive((LPC_UART_TypeDef *)LPC_UART1, &tmpc, 1, NONE_BLOCKING); + // If data received + if (rLen){ + /* Check if buffer is more space + * If no more space, remaining character will be trimmed out + */ + if (!__BUF_IS_FULL(rb.rx_head,rb.rx_tail)){ + rb.rx[rb.rx_head] = tmpc; + __BUF_INCR(rb.rx_head); + } + } + // no more data + else { + break; + } + } +#else +#if (AUTO_SLVADDR_DETECT == 0) + + uint8_t tmpc; + uint32_t rLen; + + while(1){ + // Call UART read function in UART driver + rLen = UART_Receive((UART_TypeDef *)UART1, &tmpc, 1, NONE_BLOCKING); + // If data received + if (rLen){ + /* Check if buffer is more space + * If no more space, remaining character will be trimmed out + */ + if (!__BUF_IS_FULL(rb.rx_head,rb.rx_tail)){ + rb.rx[rb.rx_head] = tmpc; + __BUF_INCR(rb.rx_head); + } + } + // no more data + else { + break; + } + } +#else + + uint8_t tmpc; + uint32_t rLen; + + while(1){ + // Call UART read function in UART driver + rLen = UART_Receive((LPC_UART_TypeDef *)LPC_UART1, &tmpc, 1, NONE_BLOCKING); + // If data received + if (rLen){ + /* Check if buffer is more space + * If no more space, remaining character will be trimmed out + */ + if (!__BUF_IS_FULL(rb.rx_head,rb.rx_tail)){ + rb.rx[rb.rx_head] = tmpc; + __BUF_INCR(rb.rx_head); + } + } + // no more data + else { + break; + } + } +#endif +#endif +} + + +/*********************************************************************//** + * @brief UART Line Status Error + * @param[in] bLSErrType UART Line Status Error Type + * @return None + **********************************************************************/ +void UART_IntErr(uint8_t bLSErrType) +{ + uint8_t tmp; +#if (RECEIVER_ALWAYS_EN) + uint8_t tmpc; + + if (bLSErrType & UART_LSR_PE){ + // Parity error means the latest frame receive is slave address frame, + // Value of slave address is read and trimmed out. + UART_Send(LPC_UART0, p_err_menu, sizeof(p_err_menu), BLOCKING); + UART_Send(LPC_UART0, addr_menu, sizeof(addr_menu), BLOCKING); + UART_Receive((LPC_UART_TypeDef *)LPC_UART1, &tmpc, 1, NONE_BLOCKING); + } + + if (bLSErrType & UART_LSR_FE){ + UART_Send(LPC_UART0, f_err_menu, sizeof(f_err_menu), BLOCKING); + } +#else +#if (AUTO_SLVADDR_DETECT == 0) + uint8_t tmp; + // Check if this interrupt caused by parity error, + // that means the last received frame is address frame, + // if this address is matched with its own address, + // continue to receive following data frame. + if (bLSErrType & UART_LSR_PE){ + UART_Receive((UART_TypeDef *)UART1, &tmp, 1, NONE_BLOCKING); + UART_Send(UART0, p_err_menu, sizeof(p_err_menu), BLOCKING); + if (tmp == SLAVE_ADDR){ + UART_RS485ReceiverCmd(UART1, ENABLE); + UART_Send(UART0, addr_acc, sizeof(addr_acc), BLOCKING); + } else { + // Disable receiver + UART_RS485ReceiverCmd(UART1, DISABLE); + UART_Send(UART0, addr_una, sizeof(addr_una), BLOCKING); + } + } +#else + + // Check if this interrupt caused by parity error, + // that means the last received frame is address frame, + // if this address is matched with its own address, + // continue to receive following data frame. + if (bLSErrType & UART_LSR_PE){ + UART_Receive((LPC_UART_TypeDef *)LPC_UART1, &tmp, 1, NONE_BLOCKING); + UART_Send(LPC_UART0, addr_auto, sizeof(addr_auto), BLOCKING); + } +#endif +#endif +} + +/*-------------------------PRIVATE FUNCTIONS------------------------------*/ +/*********************************************************************//** + * @brief UART read function for interrupt mode (using ring buffers) + * @param[in] UARTPort Selected UART peripheral used to send data, + * should be UART0 + * @param[out] rxbuf Pointer to Received buffer + * @param[in] buflen Length of Received buffer + * @return Number of bytes actually read from the ring buffer + **********************************************************************/ +uint32_t UARTReceive(LPC_UART_TypeDef *UARTPort, uint8_t *rxbuf, uint8_t buflen) +{ + uint8_t *data = (uint8_t *) rxbuf; + uint32_t bytes = 0; + + /* Temporarily lock out UART receive interrupts during this + read so the UART receive interrupt won't cause problems + with the index values */ + UART_IntConfig(UARTPort, UART_INTCFG_RBR, DISABLE); + + /* Loop until receive buffer ring is empty or + until max_bytes expires */ + while ((buflen > 0) && (!(__BUF_IS_EMPTY(rb.rx_head, rb.rx_tail)))) + { + /* Read data from ring buffer into user buffer */ + *data = rb.rx[rb.rx_tail]; + data++; + + /* Update tail pointer */ + __BUF_INCR(rb.rx_tail); + + /* Increment data count and decrement buffer size count */ + bytes++; + buflen--; + } + + /* Re-enable UART interrupts */ + UART_IntConfig(UARTPort, UART_INTCFG_RBR, ENABLE); + + return bytes; +} + +/*********************************************************************//** + * @brief Print Welcome menu + * @param[in] none + * @return None + **********************************************************************/ +void print_menu(void) +{ + UART_Send(LPC_UART0, menu1, sizeof(menu1), BLOCKING); +} + + +/*-------------------------MAIN FUNCTION------------------------------*/ +/*********************************************************************//** + * @brief c_entry: Main UART-RS485 program body + * @param[in] None + * @return int + **********************************************************************/ +int c_entry(void) +{ + // UART Configuration structure variable + UART_CFG_Type UARTConfigStruct; + // UART FIFO configuration Struct variable + UART_FIFO_CFG_Type UARTFIFOConfigStruct; + // Pin configuration + PINSEL_CFG_Type PinCfg; + // RS485 configuration + UART1_RS485_CTRLCFG_Type rs485cfg; + uint32_t idx, len; + uint8_t buffer[10]; + uint32_t tmp; + + // UART0 section ---------------------------------------------------- + /* + * Initialize UART0 pin connect + */ + PinCfg.Funcnum = 1; + PinCfg.OpenDrain = 0; + PinCfg.Pinmode = 0; + PinCfg.Pinnum = 2; + PinCfg.Portnum = 0; + PINSEL_ConfigPin(&PinCfg); + PinCfg.Pinnum = 3; + PINSEL_ConfigPin(&PinCfg); + + /* Initialize UART Configuration parameter structure to default state: + * Baudrate = 115200 bps + * 8 data bit + * 1 Stop bit + * None parity + */ + UART_ConfigStructInit(&UARTConfigStruct); + UARTConfigStruct.Baud_rate = 115200; + + // Initialize UART0 peripheral with given to corresponding parameter + UART_Init(LPC_UART0, &UARTConfigStruct); + + /* Initialize FIFOConfigStruct to default state: + * - FIFO_DMAMode = DISABLE + * - FIFO_Level = UART_FIFO_TRGLEV0 + * - FIFO_ResetRxBuf = ENABLE + * - FIFO_ResetTxBuf = ENABLE + * - FIFO_State = ENABLE + */ + UART_FIFOConfigStructInit(&UARTFIFOConfigStruct); + + // Initialize FIFO for UART0 peripheral + UART_FIFOConfig(LPC_UART0, &UARTFIFOConfigStruct); + + // Enable UART Transmit + UART_TxCmd(LPC_UART0, ENABLE); + + // print welcome screen + print_menu(); + + + // UART1 - RS485 section ------------------------------------------------- + /* + * Initialize UART1 pin connect + */ + PinCfg.Funcnum = 2; + PinCfg.OpenDrain = 0; + PinCfg.Pinmode = 0; + // TXD1 - P2.0 + PinCfg.Pinnum = 0; + PinCfg.Portnum = 2; + PINSEL_ConfigPin(&PinCfg); + // RXD1 - P2.1 + PinCfg.Pinnum = 1; + PINSEL_ConfigPin(&PinCfg); + // DTR1 - P2.5 + PinCfg.Pinnum = 5; + PINSEL_ConfigPin(&PinCfg); + + + /* Initialize UART Configuration parameter structure to default state: + * Baudrate = 9600 bps + * 8 data bit + * 1 Stop bit + * Parity: None + * Note: Parity will be enabled later in UART_RS485Config() function. + */ + UART_ConfigStructInit(&UARTConfigStruct); + + // Initialize UART0 peripheral with given to corresponding parameter + UART_Init((LPC_UART_TypeDef *)LPC_UART1, &UARTConfigStruct); + + /* Initialize FIFOConfigStruct to default state: + * - FIFO_DMAMode = DISABLE + * - FIFO_Level = UART_FIFO_TRGLEV0 + * - FIFO_ResetRxBuf = ENABLE + * - FIFO_ResetTxBuf = ENABLE + * - FIFO_State = ENABLE + */ + UART_FIFOConfigStructInit(&UARTFIFOConfigStruct); + + // Initialize FIFO for UART0 peripheral + UART_FIFOConfig((LPC_UART_TypeDef *)LPC_UART1, &UARTFIFOConfigStruct); + + // Configure RS485 + /* + * - Auto Direction in Tx/Rx driving is enabled + * - Direction control pin is set to DTR1 + * - Direction control pole is set to "1" that means direction pin + * will drive to high state before transmit data. + * - Multidrop mode is enable + * - Auto detect address is disabled + * - Receive state is enable + */ + rs485cfg.AutoDirCtrl_State = ENABLE; + rs485cfg.DirCtrlPin = UART1_RS485_DIRCTRL_DTR; + rs485cfg.DirCtrlPol_Level = SET; + rs485cfg.DelayValue = 50; + rs485cfg.NormalMultiDropMode_State = ENABLE; +#if AUTO_SLVADDR_DETECT + rs485cfg.AutoAddrDetect_State = ENABLE; + rs485cfg.MatchAddrValue = SLAVE_ADDR; +#else + rs485cfg.AutoAddrDetect_State = DISABLE; +#endif +#if RECEIVER_ALWAYS_EN + rs485cfg.Rx_State = ENABLE; +#else + rs485cfg.Rx_State = DISABLE; +#endif + UART_RS485Config(LPC_UART1, &rs485cfg); + + /* Enable UART Rx interrupt */ + UART_IntConfig((LPC_UART_TypeDef *)LPC_UART1, UART_INTCFG_RBR, ENABLE); + /* Enable UART line status interrupt */ + UART_IntConfig((LPC_UART_TypeDef *)LPC_UART1, UART_INTCFG_RLS, ENABLE); + + /* preemption = 1, sub-priority = 1 */ + NVIC_SetPriority(UART1_IRQn, ((0x01<<3)|0x01)); + /* Enable Interrupt for UART0 channel */ + NVIC_EnableIRQ(UART1_IRQn); + + // Enable UART Transmit + UART_TxCmd((LPC_UART_TypeDef *)LPC_UART1, ENABLE); + + // for testing... + while (1){ + len = 0; + while (len == 0) + { + len = UARTReceive((LPC_UART_TypeDef *)LPC_UART1, buffer, sizeof(buffer)); + } + + /* Got some data */ + idx = 0; + while (idx < len) + { + if (buffer[idx] == 13){ + for (tmp = 0; tmp < 1000000; tmp++); + UART_RS485SendData(LPC_UART1, ack_msg, sizeof(ack_msg)); + UART_Send(LPC_UART0, nextline, sizeof(nextline), BLOCKING); + UART_RS485SendData(LPC_UART1, &terminator, 1); + } else { + /* Echo it back */ + UART_Send(LPC_UART0, &buffer[idx], 1, BLOCKING); + } + idx++; + } + } + + 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 + +/* + * @} + */