Diff: targets/hal/TARGET_Freescale/TARGET_KSDK2_MCUS/TARGET_KL27Z/serial_api.c

Revision:

121:7f86b4238bec

--- /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