/* * File : drv_uart.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2009-2013 RT-Thread Develop Team * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.rt-thread.org/license/LICENSE * * Change Logs: * Date Author Notes * 2013-05-18 Bernard The first version for LPC40xx */ #include #include #include #include "board.h" #include "drv_uart.h" struct lpc_uart { LPC_USARTn_Type *USART; IRQn_Type USART_IRQn; }; static rt_err_t lpc_configure(struct rt_serial_device *serial, struct serial_configure *cfg) { // struct lpc_uart *uart; RT_ASSERT(serial != RT_NULL); // uart = (struct lpc_uart *)serial->parent.user_data; // Initialize FIFO for UART0 peripheral // UART_FIFOConfig(uart->USART, &UARTFIFOConfigStruct); // UART_TxCmd(uart->USART, ENABLE); return RT_EOK; } static rt_err_t lpc_control(struct rt_serial_device *serial, int cmd, void *arg) { struct lpc_uart *uart; RT_ASSERT(serial != RT_NULL); uart = (struct lpc_uart *)serial->parent.user_data; switch (cmd) { case RT_DEVICE_CTRL_CLR_INT: /* disable rx irq */ uart->USART->IER &= ~UART_IER_RBRINT_EN; break; case RT_DEVICE_CTRL_SET_INT: /* enable rx irq */ uart->USART->IER |= UART_IER_RBRINT_EN; break; } return RT_EOK; } static int lpc_putc(struct rt_serial_device *serial, char c) { struct lpc_uart *uart; uart = (struct lpc_uart *)serial->parent.user_data; while (!(uart->USART->LSR & 0x20)); uart->USART->THR = c; return 1; } static int lpc_getc(struct rt_serial_device *serial) { struct lpc_uart *uart; uart = (struct lpc_uart *)serial->parent.user_data; if (uart->USART->LSR & 0x01) { return (uart->USART->RBR); } return -1; } static const struct rt_uart_ops lpc_uart_ops = { lpc_configure, lpc_control, lpc_putc, lpc_getc, }; #if defined(RT_USING_UART0) /* UART0 device driver structure */ struct serial_ringbuffer uart0_int_rx; struct lpc_uart uart0 = { LPC_USART0, USART0_IRQn, }; struct rt_serial_device serial0; void UART0_IRQHandler(void) { struct lpc_uart *uart; volatile uint32_t intsrc, temp; uart = &uart0; /* enter interrupt */ rt_interrupt_enter(); /* Determine the interrupt source */ intsrc = uart->USART->IIR & UART_IIR_INTID_MASK; switch (intsrc) { case UART_IIR_INTID_RLS: /* Receive Line Status interrupt*/ /* read the line status */ intsrc = uart->USART->LSR; /* Receive an error data */ if (intsrc & UART_LSR_PE) { temp = LPC_USART0->RBR; } break; case UART_IIR_INTID_RDA: /* Receive data */ case UART_IIR_INTID_CTI: /* Receive data timeout */ /* read the data to buffer */ while (uart->USART->LSR & UART_LSR_RDR) { rt_hw_serial_isr(&serial0); } break; default: break; } /* leave interrupt */ rt_interrupt_leave(); } #endif #if defined(RT_USING_UART2) /* UART2 device driver structure */ struct serial_ringbuffer uart2_int_rx; struct lpc_uart uart2 = { LPC_USART2, USART2_IRQn, }; struct rt_serial_device serial2; void UART2_IRQHandler(void) { struct lpc_uart *uart; uint32_t intsrc, temp; uart = &uart2; /* enter interrupt */ rt_interrupt_enter(); /* Determine the interrupt source */ intsrc = uart->USART->IIR & UART_IIR_INTID_MASK; switch (intsrc) { case UART_IIR_INTID_RLS: /* Receive Line Status interrupt*/ /* read the line status */ intsrc = uart->USART->LSR; /* Receive an error data */ if (intsrc & UART_LSR_PE) { temp = LPC_USART0->RBR; } break; case UART_IIR_INTID_RDA: /* Receive data */ case UART_IIR_INTID_CTI: /* Receive data timeout */ /* read the data to buffer */ while (uart->USART->LSR & UART_LSR_RDR) { rt_hw_serial_isr(&serial0); } break; default: break; } /* leave interrupt */ rt_interrupt_leave(); } #endif void rt_hw_uart_init(void) { struct lpc_uart *uart; struct serial_configure config; #ifdef RT_USING_UART0 uart = &uart0; config.baud_rate = BAUD_RATE_115200; config.bit_order = BIT_ORDER_LSB; config.data_bits = DATA_BITS_8; config.parity = PARITY_NONE; config.stop_bits = STOP_BITS_1; config.invert = NRZ_NORMAL; serial0.ops = &lpc_uart_ops; serial0.int_rx = &uart0_int_rx; serial0.config = config; /* Enable GPIO register interface clock */ LPC_CCU1->CLK_M4_GPIO_CFG |= 0x01; while (!(LPC_CCU1->CLK_M4_GPIO_STAT & 0x01)); /* Enable USART1 peripheral clock */ LPC_CCU2->CLK_APB0_USART0_CFG |= 0x01; while (!(LPC_CCU2->CLK_APB0_USART0_STAT & 0x01)); /* Enable USART1 register interface clock */ LPC_CCU1->CLK_M4_USART0_CFG |= 0x01; while (!(LPC_CCU1->CLK_M4_USART0_STAT & 0x01)); /* Init GPIO pins */ LPC_SCU->SFSP2_0 = (1 << 6) | /* Input buffer enabled */ (1 << 4) | /* Pull-up disabled */ (1 << 0) ; /* Pin P2_0 used as U0_TXD */ LPC_SCU->SFSP2_1 = (1 << 6) | /* Input buffer enabled */ (1 << 4) | /* Pull-up disabled */ (1 << 0) ; /* Pin P2_1 used as U0_RXD */ /* Init USART0 */ LPC_USART0->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ LPC_USART0->DLL = 0x06; /* 115200 Baudrate @ 12 MHz IRC */ LPC_USART0->DLM = 0x00; LPC_USART0->FDR = 0xC1; LPC_USART0->LCR = 0x03; /* DLAB = 0 */ /* enable the receive interrupt */ LPC_USART0->IER |= UART_IER_RBRINT_EN; /* preemption = 1, sub-priority = 1 */ NVIC_SetPriority(uart->USART_IRQn, ((0x01 << 3) | 0x01)); /* Enable Interrupt for UART channel */ NVIC_EnableIRQ(uart->USART_IRQn); /* register UART1 device */ rt_hw_serial_register(&serial0, "uart0", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM, uart); #endif #ifdef RT_USING_UART2 uart = &uart2; config.baud_rate = BAUD_RATE_115200; config.bit_order = BIT_ORDER_LSB; config.data_bits = DATA_BITS_8; config.parity = PARITY_NONE; config.stop_bits = STOP_BITS_1; config.invert = NRZ_NORMAL; serial2.ops = &lpc_uart_ops; serial2.int_rx = &uart2_int_rx; serial2.config = config; /* Enable GPIO register interface clock */ LPC_CCU1->CLK_M4_GPIO_CFG |= 0x01; while (!(LPC_CCU1->CLK_M4_GPIO_STAT & 0x01)); /* Enable USART1 peripheral clock */ LPC_CCU2->CLK_APB0_USART0_CFG |= 0x01; while (!(LPC_CCU2->CLK_APB2_USART2_STAT & 0x01)); /* Enable USART2 register interface clock */ LPC_CCU1->CLK_M4_USART0_CFG |= 0x01; while (!(LPC_CCU1->CLK_M4_USART2_STAT & 0x01)); /* Init GPIO pins */ LPC_SCU->SFSP1_15 = (1 << 6) | /* Input buffer enabled */ (1 << 4) | /* Pull-up disabled */ (1 << 0) ; /* Pin P1_15 used as U2_TXD */ LPC_SCU->SFSP1_16 = (1 << 6) | /* Input buffer enabled */ (1 << 4) | /* Pull-up disabled */ (1 << 0) ; /* Pin P1_16 used as U2_RXD */ /* Init USART2 */ LPC_USART2->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */ LPC_USART2->DLL = 0x06; /* 115200 Baudrate @ 12 MHz IRC */ LPC_USART2->DLM = 0x00; LPC_USART2->FDR = 0xC1; LPC_USART2->LCR = 0x03; /* DLAB = 0 */ /* enable the receive interrupt */ LPC_USART2->IER |= UART_IER_RBRINT_EN; /* preemption = 1, sub-priority = 1 */ NVIC_SetPriority(uart->USART_IRQn, ((0x01 << 3) | 0x01)); /* Enable Interrupt for UART channel */ NVIC_EnableIRQ(uart->USART_IRQn); /* register UART1 device */ rt_hw_serial_register(&serial2, "uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM, uart); #endif }