Diff: vendor/NXP/LPC812/hal/serial_api.c

Revision:

13:0645d8841f51

Parent:

12:5fa2273de5db

Child:

14:096882eb0961

--- a/vendor/NXP/LPC812/hal/serial_api.c	Wed Jul 24 11:11:21 2013 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,269 +0,0 @@
-/* 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.
- */
-// math.h required for floating point operations for baud rate calculation
-#include <math.h>
-#include <string.h>
-
-#include "serial_api.h"
-#include "cmsis.h"
-#include "pinmap.h"
-#include "error.h"
-
-/******************************************************************************
- * INITIALIZATION
- ******************************************************************************/
-#define UART_NUM    3
-
-static const SWM_Map SWM_UART_TX[] = {
-    {0, 0},
-    {1, 8},
-    {2, 16},
-};
-
-static const SWM_Map SWM_UART_RX[] = {
-    {0, 8},
-    {1, 16},
-    {2, 24},
-};
-
-// bit flags for used UARTs
-static unsigned char uart_used = 0;
-static int get_available_uart(void) {
-    int i;
-    for (i=0; i<3; i++) {
-        if ((uart_used & (1 << i)) == 0)
-            return i;
-    }
-    return -1;
-}
-
-#define UART_EN       (0x01<<0)
-
-#define CTS_DELTA     (0x01<<5)
-#define RXBRK         (0x01<<10)
-#define DELTA_RXBRK   (0x01<<11)
-
-#define RXRDY         (0x01<<0)
-#define TXRDY         (0x01<<2)
-
-static uint32_t UARTSysClk;
-
-static uint32_t serial_irq_ids[UART_NUM] = {0};
-static uart_irq_handler irq_handler;
-
-int stdio_uart_inited = 0;
-serial_t stdio_uart;
-
-void serial_init(serial_t *obj, PinName tx, PinName rx) {
-    int is_stdio_uart = 0;
-    
-    int uart_n = get_available_uart();
-    if (uart_n == -1) {
-        error("No available UART");
-    }
-    obj->index = uart_n;
-    obj->uart = (LPC_USART_TypeDef *)(LPC_USART0_BASE + (0x4000 * uart_n));
-    uart_used |= (1 << uart_n);
-    
-    const SWM_Map *swm;
-    uint32_t regVal;
-    
-    swm = &SWM_UART_TX[uart_n];
-    regVal = LPC_SWM->PINASSIGN[swm->n] & ~(0xFF << swm->offset);
-    LPC_SWM->PINASSIGN[swm->n] = regVal |  (tx   << swm->offset);
-    
-    swm = &SWM_UART_RX[uart_n];
-    regVal = LPC_SWM->PINASSIGN[swm->n] & ~(0xFF << swm->offset);
-    LPC_SWM->PINASSIGN[swm->n] = regVal |  (rx   << swm->offset);
-    
-    /* uart clock divided by 1 */
-    LPC_SYSCON->UARTCLKDIV = 1;
-    
-    /* disable uart interrupts */
-    NVIC_DisableIRQ((IRQn_Type)(UART0_IRQn + uart_n));
-    
-    /* Enable UART clock */
-    LPC_SYSCON->SYSAHBCLKCTRL |= (1 << (14 + uart_n));
-    
-    /* Peripheral reset control to UART, a "1" bring it out of reset. */
-    LPC_SYSCON->PRESETCTRL &= ~(0x1 << (3 + uart_n));
-    LPC_SYSCON->PRESETCTRL |=  (0x1 << (3 + uart_n));
-    
-    UARTSysClk = SystemCoreClock / LPC_SYSCON->UARTCLKDIV;
-    
-    // set default baud rate and format
-    serial_baud  (obj, 9600);
-    serial_format(obj, 8, ParityNone, 1);
-    
-    /* Clear all status bits. */
-    obj->uart->STAT = CTS_DELTA | DELTA_RXBRK;
-    
-    /* enable uart interrupts */
-    NVIC_EnableIRQ((IRQn_Type)(UART0_IRQn + uart_n));
-    
-    /* Enable UART interrupt */
-    // obj->uart->INTENSET = RXRDY | TXRDY | DELTA_RXBRK;
-    
-    /* Enable UART */
-    obj->uart->CFG |= UART_EN;
-    
-    is_stdio_uart = ((tx == USBTX) && (rx == USBRX));
-    
-    if (is_stdio_uart) {
-        stdio_uart_inited = 1;
-        memcpy(&stdio_uart, obj, sizeof(serial_t));
-    }
-}
-
-void serial_free(serial_t *obj) {
-    uart_used &= ~(1 << obj->index);
-    serial_irq_ids[obj->index] = 0;
-}
-
-// serial_baud
-// set the baud rate, taking in to account the current SystemFrequency
-void serial_baud(serial_t *obj, int baudrate) {
-    /* Integer divider:
-         BRG = UARTSysClk/(Baudrate * 16) - 1
-       
-       Frational divider:
-         FRG = ((UARTSysClk / (Baudrate * 16 * (BRG + 1))) - 1)
-       
-       where
-         FRG = (LPC_SYSCON->UARTFRDADD + 1) / (LPC_SYSCON->UARTFRDSUB + 1)
-       
-       (1) The easiest way is set SUB value to 256, -1 encoded, thus SUB
-           register is 0xFF.
-       (2) In ADD register value, depending on the value of UartSysClk,
-           baudrate, BRG register value, and SUB register value, be careful
-           about the order of multiplier and divider and make sure any
-           multiplier doesn't exceed 32-bit boundary and any divider doesn't get
-           down below one(integer 0).
-       (3) ADD should be always less than SUB.
-    */
-    obj->uart->BRG = UARTSysClk / 16 / baudrate - 1;
-    
-    LPC_SYSCON->UARTFRGDIV = 0xFF;
-    LPC_SYSCON->UARTFRGMULT = ( ((UARTSysClk / 16) * (LPC_SYSCON->UARTFRGDIV + 1)) /
-                                (baudrate * (obj->uart->BRG + 1))
-                              ) - (LPC_SYSCON->UARTFRGDIV + 1);
-
-}
-
-void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
-    // 0: 1 stop bits, 1: 2 stop bits
-    if (stop_bits != 1 && stop_bits != 2) {
-        error("Invalid stop bits specified");
-    }
-    stop_bits -= 1;
-    
-    // 0: 7 data bits ... 2: 9 data bits
-    if (data_bits < 7 || data_bits > 9) {
-        error("Invalid number of bits (%d) in serial format, should be 7..9", data_bits);
-    }
-    data_bits -= 7;
-    
-    int paritysel;
-    switch (parity) {
-        case ParityNone: paritysel = 0; break;
-        case ParityEven: paritysel = 2; break;
-        case ParityOdd : paritysel = 3; break;
-        default:
-            error("Invalid serial parity setting");
-            return;
-    }
-    
-    obj->uart->CFG = (data_bits << 2)
-                   | (paritysel << 4)
-                   | (stop_bits << 6);
-}
-
-/******************************************************************************
- * INTERRUPTS HANDLING
- ******************************************************************************/
-static inline void uart_irq(uint32_t iir, uint32_t index) {
-    // [Chapter 14] LPC17xx UART0/2/3: UARTn Interrupt Handling
-    SerialIrq irq_type;
-    switch (iir) {
-        case 1: irq_type = TxIrq; break;
-        case 2: irq_type = RxIrq; break;
-        default: return;
-    }
-    
-    if (serial_irq_ids[index] != 0)
-        irq_handler(serial_irq_ids[index], irq_type);
-}
-
-void uart0_irq() {uart_irq((LPC_USART0->STAT & (1 << 2)) ? 2 : 1, 0);}
-void uart1_irq() {uart_irq((LPC_USART1->STAT & (1 << 2)) ? 2 : 1, 1);}
-void uart2_irq() {uart_irq((LPC_USART2->STAT & (1 << 2)) ? 2 : 1, 2);}
-
-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 irq_n = (IRQn_Type)0;
-    uint32_t vector = 0;
-    switch ((int)obj->uart) {
-        case LPC_USART0_BASE: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break;
-        case LPC_USART1_BASE: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break;
-        case LPC_USART2_BASE: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break;
-    }
-    
-    if (enable) {
-        obj->uart->INTENSET = (1 << ((irq == RxIrq) ? 0 : 2));
-        NVIC_SetVector(irq_n, vector);
-        NVIC_EnableIRQ(irq_n);
-    } else { // disable
-        int all_disabled = 0;
-        SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
-        obj->uart->INTENSET &= ~(1 << ((irq == RxIrq) ? 0 : 2));
-        all_disabled = (obj->uart->INTENSET & (1 << ((other_irq == RxIrq) ? 0 : 2))) == 0;
-        if (all_disabled)
-            NVIC_DisableIRQ(irq_n);
-    }
-}
-
-/******************************************************************************
- * READ/WRITE
- ******************************************************************************/
-int serial_getc(serial_t *obj) {
-    while (!serial_readable(obj));
-    return obj->uart->RXDATA;
-}
-
-void serial_putc(serial_t *obj, int c) {
-    while (!serial_writable(obj));
-    obj->uart->TXDATA = c;
-}
-
-int serial_readable(serial_t *obj) {
-    return obj->uart->STAT & RXRDY;
-}
-
-int serial_writable(serial_t *obj) {
-    return obj->uart->STAT & TXRDY;
-}
-
-void serial_clear(serial_t *obj) {
-    // [TODO]
-}
-
-void serial_pinout_tx(PinName tx) {
-    
-}