added prescaler for 16 bit pwm in LPC1347 target
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Diff: targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c
- Revision:
- 121:7f86b4238bec
diff -r f2ddb8be7462 -r 7f86b4238bec targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c Tue May 03 00:15:16 2016 +0100 @@ -0,0 +1,256 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 ARM Limited + * + * 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 "peripheral_clock_defines.h" +#include "PeripheralPins.h" +#include "fsl_clock_config.h" + +static uint32_t serial_irq_ids[FSL_FEATURE_SOC_LPUART_COUNT] = {0}; +static uart_irq_handler irq_handler; +/* Array of UART peripheral base address. */ +static LPUART_Type *const uart_addrs[] = LPUART_BASE_PTRS; +/* Array of LPUART bus clock frequencies */ +static clock_name_t const uart_clocks[] = LPUART_CLOCK_FREQS; + +int stdio_uart_inited = 0; +serial_t stdio_uart; + +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); + + // Need to initialize the clocks here as ticker init gets called before mbed_sdk_init + if (SystemCoreClock == DEFAULT_SYSTEM_CLOCK) + BOARD_BootClockRUN(); + + /* Set the LPUART clock source */ + if (obj->index == LPUART_0) { + CLOCK_SetLpuart0Clock(1U); + } else { + CLOCK_SetLpuart1Clock(1U); + } + + lpuart_config_t config; + LPUART_GetDefaultConfig(&config); + config.baudRate_Bps = 9600; + config.enableTx = false; + config.enableRx = false; + + LPUART_Init(uart_addrs[obj->index], &config, CLOCK_GetFreq(uart_clocks[obj->index])); + + 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, PullUp); + } + if (rx != NC) { + LPUART_EnableRx(uart_addrs[obj->index], true); + pin_mode(rx, PullUp); + } + + 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, CLOCK_GetFreq(uart_clocks[obj->index])); +} + +void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { + LPUART_Type *base = uart_addrs[obj->index]; + uint8_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 { + // 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 uart0_irq() { + uint32_t status_flags = LPUART0->STAT; + uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 0); +} + +void uart1_irq() { + uint32_t status_flags = LPUART1->STAT; + uart_irq((status_flags & kLPUART_TxDataRegEmptyFlag), (status_flags & kLPUART_RxDataRegFullFlag), 1); +} + +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 0: + vector = (uint32_t)&uart0_irq; + break; + case 1: + vector = (uint32_t)&uart1_irq; + break; + default: + break; + } + + 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; +} + +#endif