Diff: targets/hal/TARGET_ARM_SSG/TARGET_MPS2/serial_api.c

Revision:

580:3c14cb9b87c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_ARM_SSG/TARGET_MPS2/serial_api.c	Thu Jul 02 16:15:09 2015 +0100
@@ -0,0 +1,230 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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.
+ */
+// math.h required for floating point operations for baud rate calculation
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "serial_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "mbed_error.h"
+#include "gpio_api.h"
+
+/******************************************************************************
+ * INITIALIZATION
+ ******************************************************************************/
+
+static const PinMap PinMap_UART_TX[] = {
+    {USBTX	 , UART_0, 0},
+    {UART_TX1, UART_1, 0},
+    {NC      , NC    , 0}
+};
+
+static const PinMap PinMap_UART_RX[] = {
+    {USBRX	 , UART_0, 0},
+    {UART_RX1, UART_1, 0},
+    {NC , NC      , 0}
+};
+
+#define UART_NUM    3
+
+static uart_irq_handler irq_handler;
+
+int stdio_uart_inited = 0;
+serial_t stdio_uart;
+
+struct serial_global_data_s {
+    uint32_t serial_irq_id;
+    gpio_t sw_rts, sw_cts;
+    uint8_t count, rx_irq_set_flow, rx_irq_set_api;
+};
+
+static struct serial_global_data_s uart_data[UART_NUM];
+
+void serial_init(serial_t *obj, PinName tx, PinName rx) {
+    int is_stdio_uart = 0;
+    
+    // determine the UART to use
+    UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
+    UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
+    UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
+    if ((int)uart == NC) {
+        error("Serial pinout mapping failed");
+    }
+    
+    obj->uart = (CMSDK_UART_TypeDef *)uart;
+    //set baud rate and enable Uart in normarl mode (RX and TX enabled)
+    switch (uart) {
+        case UART_0: 	CMSDK_UART0->CTRL = 0;         // Disable UART when changing configuration 
+											CMSDK_UART0->CTRL    = 0x3;  // Normal mode 
+											break;
+        case UART_1: 	CMSDK_UART1->CTRL = 0;         // Disable UART when changing configuration 
+											CMSDK_UART1->CTRL    = 0x3;  // Normal mode 
+											break;
+    }
+
+    // set default baud rate and format
+    serial_baud  (obj, 9600);
+    
+    // pinout the chosen uart
+    pinmap_pinout(tx, PinMap_UART_TX);
+    pinmap_pinout(rx, PinMap_UART_RX);
+    
+    switch (uart) {
+        case UART_0: obj->index = 0; break;
+        case UART_1: obj->index = 1; break;
+    }
+    uart_data[obj->index].sw_rts.pin = NC;
+    uart_data[obj->index].sw_cts.pin = NC;
+    serial_set_flow_control(obj, FlowControlNone, NC, NC);
+    
+    is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
+    
+    if (is_stdio_uart) {
+        stdio_uart_inited = 1;
+        memcpy(&stdio_uart, obj, sizeof(serial_t));
+    }
+}
+
+void serial_free(serial_t *obj) {
+}
+
+// serial_baud
+// set the baud rate, taking in to account the current SystemFrequency
+void serial_baud(serial_t *obj, int baudrate) {
+    // The MPS2 has a simple divider to control the baud rate. The formula is:
+    //
+    // Baudrate = PCLK / BAUDDIV
+		//
+		// PCLK = 25 Mhz
+		// so for a desired baud rate of 9600 
+		//  25000000 / 9600 = 2604
+    //
+	//check to see if minimum baud value entered
+	int baudrate_div = 0;
+	baudrate_div = 25000000 / baudrate;
+	if(baudrate >= 16){
+    switch ((int)obj->uart) {
+        case UART_0: CMSDK_UART0->BAUDDIV = baudrate_div; break;
+        case UART_1: CMSDK_UART1->BAUDDIV = baudrate_div; break;
+        default: error("serial_baud"); break;
+    }
+	} else {
+		error("serial_baud");
+	}
+    
+}
+
+void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
+}
+
+/******************************************************************************
+ * INTERRUPTS HANDLING
+ ******************************************************************************/
+static inline void uart_irq(uint32_t intstatus, uint32_t index, CMSDK_UART_TypeDef *puart) {
+    SerialIrq irq_type;
+    switch (intstatus) {
+        case 1: irq_type = TxIrq; break;
+        case 2: irq_type = RxIrq; break;
+        default: return;
+    }
+    if ((RxIrq == irq_type) && (NC != uart_data[index].sw_rts.pin)) {
+        gpio_write(&uart_data[index].sw_rts, 1);
+        // Disable interrupt if it wasn't enabled by other part of the application
+        if (!uart_data[index].rx_irq_set_api)
+            puart->CTRL &= ~(1 << RxIrq);
+    }
+    if (uart_data[index].serial_irq_id != 0)
+        if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api))
+            irq_handler(uart_data[index].serial_irq_id, irq_type);
+}
+
+void uart0_irq() {uart_irq(CMSDK_UART0->INTSTATUS & 0x3, 0, (CMSDK_UART_TypeDef*)CMSDK_UART0);}
+void uart1_irq() {uart_irq(CMSDK_UART1->INTSTATUS & 0x3, 1, (CMSDK_UART_TypeDef*)CMSDK_UART1);}
+
+void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
+    irq_handler = handler;
+    uart_data[obj->index].serial_irq_id = id;
+}
+
+static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) {
+    IRQn_Type irq_n = (IRQn_Type)0;
+    uint32_t vector = 0;
+    switch ((int)obj->uart) {
+		case UART_0: irq_n=((irq>> 2) ? UARTRX0_IRQn : UARTTX0_IRQn); vector = (uint32_t)&uart0_irq; break;
+		case UART_1: irq_n=((irq>> 2) ? UARTRX1_IRQn : UARTTX1_IRQn); vector = (uint32_t)&uart1_irq; break;
+    }
+    
+    if (enable) {
+        obj->uart->CTRL |= 1 << irq;
+        NVIC_SetVector(irq_n, vector);
+        NVIC_EnableIRQ(irq_n);
+    } else if ((TxIrq == irq) || (uart_data[obj->index].rx_irq_set_api + uart_data[obj->index].rx_irq_set_flow == 0)) { // disable
+        int all_disabled = 0;
+        SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
+        obj->uart->CTRL &= ~(1 << irq);
+        all_disabled = (obj->uart->CTRL & (1 << other_irq)) == 0;
+        if (all_disabled)
+            NVIC_DisableIRQ(irq_n);
+    }
+}
+
+void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
+    if (RxIrq == irq)
+        uart_data[obj->index].rx_irq_set_api = enable;
+    serial_irq_set_internal(obj, irq, enable);
+}
+
+/******************************************************************************
+ * READ/WRITE
+ ******************************************************************************/
+int serial_getc(serial_t *obj) {
+    while (serial_readable(obj) == 0);
+    int data = obj->uart->DATA;
+    return data;
+}
+
+void serial_putc(serial_t *obj, int c) {
+    while (serial_writable(obj));
+    obj->uart->DATA = c;
+}
+
+int serial_readable(serial_t *obj) {
+    return obj->uart->STATE & 2;
+}
+
+int serial_writable(serial_t *obj) {
+		return obj->uart->STATE & 1;
+}
+
+void serial_clear(serial_t *obj) {
+    obj->uart->DATA = 0x00;
+}
+
+void serial_pinout_tx(PinName tx) {
+    pinmap_pinout(tx, PinMap_UART_TX);
+}
+
+void serial_break_set(serial_t *obj) {
+}
+
+void serial_break_clear(serial_t *obj) {
+}
+void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow) {
+}
+