/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "serial_api.h" #if DEVICE_SERIAL // math.h required for floating point operations for baud rate calculation #include <math.h> #include "mbed_assert.h" #include <string.h> #include "cmsis.h" #include "pinmap.h" #include "fsl_lpuart.h" #include "PeripheralPins.h" #include "clock_config.h" /* LPUART starts from index 1 */ static uint32_t serial_irq_ids[FSL_FEATURE_SOC_LPUART_COUNT + 1] = {0}; static uart_irq_handler irq_handler; /* Array of UART peripheral base address. */ static LPUART_Type *const uart_addrs[] = LPUART_BASE_PTRS; int stdio_uart_inited = 0; serial_t stdio_uart; extern uint32_t serial_get_clock(void); void serial_init(serial_t *obj, PinName tx, PinName rx) { uint32_t uart_tx = pinmap_peripheral(tx, PinMap_UART_TX); uint32_t uart_rx = pinmap_peripheral(rx, PinMap_UART_RX); obj->index = pinmap_merge(uart_tx, uart_rx); MBED_ASSERT((int)obj->index != NC); lpuart_config_t config; LPUART_GetDefaultConfig(&config); config.baudRate_Bps = 9600; config.enableTx = false; config.enableRx = false; LPUART_Init(uart_addrs[obj->index], &config, serial_get_clock()); pinmap_pinout(tx, PinMap_UART_TX); pinmap_pinout(rx, PinMap_UART_RX); if (tx != NC) { LPUART_EnableTx(uart_addrs[obj->index], true); pin_mode(tx, PullDefault); } if (rx != NC) { LPUART_EnableRx(uart_addrs[obj->index], true); pin_mode(rx, PullDefault); } if (obj->index == STDIO_UART) { stdio_uart_inited = 1; memcpy(&stdio_uart, obj, sizeof(serial_t)); } } void serial_free(serial_t *obj) { LPUART_Deinit(uart_addrs[obj->index]); serial_irq_ids[obj->index] = 0; } void serial_baud(serial_t *obj, int baudrate) { LPUART_SetBaudRate(uart_addrs[obj->index], (uint32_t)baudrate, serial_get_clock()); } void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { LPUART_Type *base = uart_addrs[obj->index]; uint32_t temp; /* Set bit count and parity mode. */ temp = base->CTRL & ~(LPUART_CTRL_PE_MASK | LPUART_CTRL_PT_MASK | LPUART_CTRL_M_MASK); if (parity != ParityNone) { /* Enable Parity */ temp |= (LPUART_CTRL_PE_MASK | LPUART_CTRL_M_MASK); if (parity == ParityOdd) { temp |= LPUART_CTRL_PT_MASK; } else if (parity == ParityEven) { // PT=0 so nothing more to do } else { // Hardware does not support forced parity MBED_ASSERT(0); } } base->CTRL = temp; #if defined(FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT) && FSL_FEATURE_LPUART_HAS_STOP_BIT_CONFIG_SUPPORT /* set stop bit per char */ temp = base->BAUD & ~LPUART_BAUD_SBNS_MASK; base->BAUD = temp | LPUART_BAUD_SBNS((uint8_t)--stop_bits); #endif } /****************************************************************************** * INTERRUPTS HANDLING ******************************************************************************/ static inline void uart_irq(uint32_t transmit_empty, uint32_t receive_full, uint32_t index) { LPUART_Type *base = uart_addrs[index]; /* If RX overrun. */ if (LPUART_STAT_OR_MASK & base->STAT) { /* Read base->D, otherwise the RX does not work. */ (void)base->DATA; LPUART_ClearStatusFlags(base, kLPUART_RxOverrunFlag); } if (serial_irq_ids[index] != 0) { if (transmit_empty) { irq_handler(serial_irq_ids[index], TxIrq); } if (receive_full) { irq_handler(serial_irq_ids[index], RxIrq); } } } void uart1_irq() { uint32_t status_flags = LPUART1->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 1); } void uart2_irq() { uint32_t status_flags = LPUART2->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 2); } void uart3_irq() { uint32_t status_flags = LPUART3->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 3); } void uart4_irq() { uint32_t status_flags = LPUART4->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 4); } void uart5_irq() { uint32_t status_flags = LPUART5->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 5); } void uart6_irq() { uint32_t status_flags = LPUART6->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 6); } void uart7_irq() { uint32_t status_flags = LPUART7->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 7); } void uart8_irq() { uint32_t status_flags = LPUART8->STAT; uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 8); } void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) { irq_handler = handler; serial_irq_ids[obj->index] = id; } void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) { IRQn_Type uart_irqs[] = LPUART_RX_TX_IRQS; uint32_t vector = 0; switch (obj->index) { case 1: vector = (uint32_t)&uart1_irq; break; case 2: vector = (uint32_t)&uart2_irq; break; case 3: vector = (uint32_t)&uart3_irq; break; case 4: vector = (uint32_t)&uart4_irq; break; case 5: vector = (uint32_t)&uart5_irq; break; case 6: vector = (uint32_t)&uart6_irq; break; case 7: vector = (uint32_t)&uart7_irq; break; case 8: vector = (uint32_t)&uart8_irq; break; default: MBED_ASSERT(false); } if (enable) { switch (irq) { case RxIrq: LPUART_EnableInterrupts(uart_addrs[obj->index], kLPUART_RxDataRegFullInterruptEnable); break; case TxIrq: LPUART_EnableInterrupts(uart_addrs[obj->index], kLPUART_TxDataRegEmptyInterruptEnable); break; default: break; } NVIC_SetVector(uart_irqs[obj->index], vector); NVIC_EnableIRQ(uart_irqs[obj->index]); } else { // disable int all_disabled = 0; SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq); switch (irq) { case RxIrq: LPUART_DisableInterrupts(uart_addrs[obj->index], kLPUART_RxDataRegFullInterruptEnable); break; case TxIrq: LPUART_DisableInterrupts(uart_addrs[obj->index], kLPUART_TxDataRegEmptyInterruptEnable); break; default: break; } switch (other_irq) { case RxIrq: all_disabled = ((LPUART_GetEnabledInterrupts(uart_addrs[obj->index]) & kLPUART_RxDataRegFullInterruptEnable) == 0); break; case TxIrq: all_disabled = ((LPUART_GetEnabledInterrupts(uart_addrs[obj->index]) & kLPUART_TxDataRegEmptyInterruptEnable) == 0); break; default: break; } if (all_disabled) NVIC_DisableIRQ(uart_irqs[obj->index]); } } int serial_getc(serial_t *obj) { uint8_t data; LPUART_ReadBlocking(uart_addrs[obj->index], &data, 1); return data; } void serial_putc(serial_t *obj, int c) { while (!serial_writable(obj)); LPUART_WriteByte(uart_addrs[obj->index], (uint8_t)c); } int serial_readable(serial_t *obj) { uint32_t status_flags = LPUART_GetStatusFlags(uart_addrs[obj->index]); if (status_flags & kLPUART_RxOverrunFlag) { LPUART_ClearStatusFlags(uart_addrs[obj->index], kLPUART_RxOverrunFlag); } return (status_flags & kLPUART_RxDataRegFullFlag); } int serial_writable(serial_t *obj) { uint32_t status_flags = LPUART_GetStatusFlags(uart_addrs[obj->index]); if (status_flags & kLPUART_RxOverrunFlag) { LPUART_ClearStatusFlags(uart_addrs[obj->index], kLPUART_RxOverrunFlag); } return (status_flags & kLPUART_TxDataRegEmptyFlag); } void serial_clear(serial_t *obj) { } void serial_pinout_tx(PinName tx) { pinmap_pinout(tx, PinMap_UART_TX); } void serial_break_set(serial_t *obj) { uart_addrs[obj->index]->CTRL |= LPUART_CTRL_SBK_MASK; } void serial_break_clear(serial_t *obj) { uart_addrs[obj->index]->CTRL &= ~LPUART_CTRL_SBK_MASK; } const PinMap *serial_tx_pinmap() { return PinMap_UART_TX; } const PinMap *serial_rx_pinmap() { return PinMap_UART_RX; } const PinMap *serial_cts_pinmap() { #if !DEVICE_SERIAL_FC static const PinMap PinMap_UART_CTS[] = { {NC, NC, 0} }; #endif return PinMap_UART_CTS; } const PinMap *serial_rts_pinmap() { #if !DEVICE_SERIAL_FC static const PinMap PinMap_UART_RTS[] = { {NC, NC, 0} }; #endif return PinMap_UART_RTS; } static int serial_is_enabled(uint32_t uart_index) { int clock_enabled = 0; switch (uart_index) { case 1: clock_enabled = (CCM->CCGR5 & CCM_CCGR5_CG12_MASK) >> CCM_CCGR5_CG12_SHIFT; break; case 2: clock_enabled = (CCM->CCGR0 & CCM_CCGR0_CG14_MASK) >> CCM_CCGR0_CG14_SHIFT; break; case 3: clock_enabled = (CCM->CCGR0 & CCM_CCGR0_CG6_MASK) >> CCM_CCGR0_CG6_SHIFT; break; case 4: clock_enabled = (CCM->CCGR1 & CCM_CCGR1_CG12_MASK) >> CCM_CCGR1_CG12_SHIFT; break; case 5: clock_enabled = (CCM->CCGR3 & CCM_CCGR3_CG1_MASK) >> CCM_CCGR3_CG1_SHIFT; break; case 6: clock_enabled = (CCM->CCGR3 & CCM_CCGR3_CG3_MASK) >> CCM_CCGR3_CG3_SHIFT; break; case 7: clock_enabled = (CCM->CCGR5 & CCM_CCGR5_CG13_MASK) >> CCM_CCGR5_CG13_SHIFT; break; case 8: clock_enabled = (CCM->CCGR6 & CCM_CCGR6_CG7_MASK) >> CCM_CCGR6_CG7_SHIFT; break; default: break; } return clock_enabled; } bool serial_check_tx_ongoing() { LPUART_Type *base; int i; bool uart_tx_ongoing = false; /* The first LPUART instance number is 1 */ for (i = 1; i <= FSL_FEATURE_SOC_LPUART_COUNT; i++) { /* First check if UART is enabled */ if (!serial_is_enabled(i)) { /* UART is not enabled, check the next instance */ continue; } base = uart_addrs[i]; /* Check if data is waiting to be written out of transmit buffer */ if (!(kLPUART_TransmissionCompleteFlag & LPUART_GetStatusFlags((LPUART_Type *)base))) { uart_tx_ongoing = true; break; } } return uart_tx_ongoing; } #endif