Diff: targets/hal/TARGET_Freescale/TARGET_KL25Z/serial_api.c

Revision:

43:b3acfef78949

Parent:

42:7ca0bbba899b

--- a/targets/hal/TARGET_Freescale/TARGET_KL25Z/serial_api.c	Sun Oct 27 16:30:04 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,313 +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.
- */
-#include "serial_api.h"
-
-// math.h required for floating point operations for baud rate calculation
-#include <math.h>
-
-#include <string.h>
-
-#include "cmsis.h"
-#include "pinmap.h"
-#include "error.h"
-
-/******************************************************************************
- * INITIALIZATION
- ******************************************************************************/
-static const PinMap PinMap_UART_TX[] = {
-    {PTC4,  UART_1, 3},
-    {PTA2,  UART_0, 2},
-    {PTD5,  UART_2, 3},
-    {PTD3,  UART_2, 3},
-    {PTD7,  UART_0, 3},
-    {PTE20, UART_0, 4},
-    {PTE22, UART_2, 4},
-    {PTE0,  UART_1, 3},
-    {NC  ,  NC    , 0}
-};
-
-static const PinMap PinMap_UART_RX[] = {
-    {PTC3,  UART_1, 3},
-    {PTA1,  UART_0, 2},
-    {PTD4,  UART_2, 3},
-    {PTD2,  UART_2, 3},
-    {PTD6,  UART_0, 3},
-    {PTE23, UART_2, 4},
-    {PTE21, UART_0, 4},
-    {PTE1,  UART_1, 3},
-    {NC  ,  NC    , 0}
-};
-
-#define UART_NUM    3
-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) {
-    // 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 = (UARTLP_Type *)uart;
-    // enable clk
-    switch (uart) {
-        case UART_0: SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK | (1<<SIM_SOPT2_UART0SRC_SHIFT);
-                     SIM->SCGC5 |= SIM_SCGC5_PORTA_MASK; SIM->SCGC4 |= SIM_SCGC4_UART0_MASK; break;
-        case UART_1: SIM->SCGC5 |= SIM_SCGC5_PORTC_MASK; SIM->SCGC4 |= SIM_SCGC4_UART1_MASK; break;
-        case UART_2: SIM->SCGC5 |= SIM_SCGC5_PORTD_MASK; SIM->SCGC4 |= SIM_SCGC4_UART2_MASK; break;
-    }
-    // Disable UART before changing registers
-    obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
-    
-    switch (uart) {
-        case UART_0: obj->index = 0; break;
-        case UART_1: obj->index = 1; break;
-        case UART_2: obj->index = 2; break;
-    }
-
-    // set default baud rate and format
-    serial_baud  (obj, 9600);
-    serial_format(obj, 8, ParityNone, 1);
-
-    // pinout the chosen uart
-    pinmap_pinout(tx, PinMap_UART_TX);
-    pinmap_pinout(rx, PinMap_UART_RX);
-
-    // set rx/tx pins in PullUp mode
-    pin_mode(tx, PullUp);
-    pin_mode(rx, PullUp);
-
-    obj->uart->C2 |= (UART_C2_RE_MASK | UART_C2_TE_MASK);
-
-    if (uart == STDIO_UART) {
-        stdio_uart_inited = 1;
-        memcpy(&stdio_uart, obj, sizeof(serial_t));
-    }
-}
-
-void serial_free(serial_t *obj) {
-    serial_irq_ids[obj->index] = 0;
-}
-
-// serial_baud
-//
-// set the baud rate, taking in to account the current SystemFrequency
-//
-// The LPC2300 and LPC1700 have a divider and a fractional divider to control the
-// baud rate. The formula is:
-//
-// Baudrate = (1 / PCLK) * 16 * DL * (1 + DivAddVal / MulVal)
-//   where:
-//     1 < MulVal <= 15
-//     0 <= DivAddVal < 14
-//     DivAddVal < MulVal
-//
-void serial_baud(serial_t *obj, int baudrate) {
-    
-    // save C2 state
-    uint8_t c2_state = (obj->uart->C2 & (UART_C2_RE_MASK | UART_C2_TE_MASK));
-    
-    // Disable UART before changing registers
-    obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
-    
-    // [TODO] not hardcode this value
-    uint32_t PCLK = (obj->uart == UART0) ? 48000000u : 24000000u;
-
-    // First we check to see if the basic divide with no DivAddVal/MulVal
-    // ratio gives us an integer result. If it does, we set DivAddVal = 0,
-    // MulVal = 1. Otherwise, we search the valid ratio value range to find
-    // the closest match. This could be more elegant, using search methods
-    // and/or lookup tables, but the brute force method is not that much
-    // slower, and is more maintainable.
-    uint16_t DL = PCLK / (16 * baudrate);
-
-    // set BDH and BDL
-    obj->uart->BDH = (obj->uart->BDH & ~(0x1f)) | ((DL >> 8) & 0x1f);
-    obj->uart->BDL = (obj->uart->BDL & ~(0xff)) | ((DL >> 0) & 0xff);
-    
-    // restore C2 state
-    obj->uart->C2 |= c2_state;
-}
-
-void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) {
-    uint8_t m10 = 0;
-    
-    // save C2 state
-    uint8_t c2_state = (obj->uart->C2 & (UART_C2_RE_MASK | UART_C2_TE_MASK));
-    
-    // Disable UART before changing registers
-    obj->uart->C2 &= ~(UART_C2_RE_MASK | UART_C2_TE_MASK);
-    
-    // 8 data bits = 0 ... 9 data bits = 1
-    if ((data_bits < 8) || (data_bits > 9)) {
-        error("Invalid number of bits (%d) in serial format, should be 8..9\r\n", data_bits);
-    }
-    data_bits -= 8;
-
-    uint8_t parity_enable, parity_select;
-    switch (parity) {
-        case ParityNone: parity_enable = 0; parity_select = 0; break;
-        case ParityOdd : parity_enable = 1; parity_select = 1; data_bits++; break;
-        case ParityEven: parity_enable = 1; parity_select = 0; data_bits++; break;
-        default:
-            error("Invalid serial parity setting\r\n");
-            return;
-    }
-
-    // 1 stop bits = 0, 2 stop bits = 1
-    if ((stop_bits != 1) && (stop_bits != 2)) {
-        error("Invalid stop bits specified\r\n");
-    }
-    stop_bits -= 1;
-    
-    // 9 data bits + parity
-    if (data_bits == 2) {
-        // only uart0 supports 10 bit communication
-        if (obj->index != 0) {
-            error("Invalid number of bits (9) to be used with parity\r\n");
-        }
-        data_bits = 0;
-        m10 = 1;
-    }
-
-    // data bits, parity and parity mode
-    obj->uart->C1 = ((data_bits << 4)
-                  |  (parity_enable << 1)
-                  |  (parity_select << 0));
-    
-    // enable 10bit mode if needed
-    if (obj->index == 0) {
-        obj->uart->C4 &= ~UARTLP_C4_M10_MASK;
-        obj->uart->C4 |= (m10 << UARTLP_C4_M10_SHIFT);
-    }
-    
-    // stop bits
-    obj->uart->BDH &= ~UART_BDH_SBNS_MASK;
-    obj->uart->BDH |= (stop_bits << UART_BDH_SBNS_SHIFT);
-    
-    // restore C2 state
-    obj->uart->C2 |= c2_state;
-}
-
-/******************************************************************************
- * INTERRUPTS HANDLING
- ******************************************************************************/
-static inline void uart_irq(uint8_t status, uint32_t index) {
-    if (serial_irq_ids[index] != 0) {
-        if (status & UART_S1_TDRE_MASK)
-            irq_handler(serial_irq_ids[index], TxIrq);
-
-        if (status & UART_S1_RDRF_MASK)
-            irq_handler(serial_irq_ids[index], RxIrq);
-    }
-}
-
-void uart0_irq() {
-    uart_irq(UART0->S1, 0);
-    if (UART0->S1 & UART_S1_OR_MASK)
-        UART0->S1 |= UART_S1_OR_MASK;
-}
-void uart1_irq() {uart_irq(UART1->S1, 1);}
-void uart2_irq() {uart_irq(UART2->S1, 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 UART_0: irq_n=UART0_IRQn; vector = (uint32_t)&uart0_irq; break;
-        case UART_1: irq_n=UART1_IRQn; vector = (uint32_t)&uart1_irq; break;
-        case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break;
-    }
-
-    if (enable) {
-        switch (irq) {
-            case RxIrq: obj->uart->C2 |= (UART_C2_RIE_MASK); break;
-            case TxIrq: obj->uart->C2 |= (UART_C2_TIE_MASK); break;
-        }
-        NVIC_SetVector(irq_n, vector);
-        NVIC_EnableIRQ(irq_n);
-
-    } else { // disable
-        int all_disabled = 0;
-        SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
-        switch (irq) {
-            case RxIrq: obj->uart->C2 &= ~(UART_C2_RIE_MASK); break;
-            case TxIrq: obj->uart->C2 &= ~(UART_C2_TIE_MASK); break;
-        }
-        switch (other_irq) {
-            case RxIrq: all_disabled = (obj->uart->C2 & (UART_C2_RIE_MASK)) == 0; break;
-            case TxIrq: all_disabled = (obj->uart->C2 & (UART_C2_TIE_MASK)) == 0; break;
-        }
-        if (all_disabled)
-            NVIC_DisableIRQ(irq_n);
-    }
-}
-
-/******************************************************************************
- * READ/WRITE
- ******************************************************************************/
-int serial_getc(serial_t *obj) {
-    while (!serial_readable(obj));
-    return obj->uart->D;
-}
-
-void serial_putc(serial_t *obj, int c) {
-    while (!serial_writable(obj));
-    obj->uart->D = c;
-}
-
-int serial_readable(serial_t *obj) {
-    // check overrun
-    if (obj->uart->S1 &  UART_S1_OR_MASK) {
-        obj->uart->S1 |= UART_S1_OR_MASK;
-    }
-    return (obj->uart->S1 & UART_S1_RDRF_MASK);
-}
-
-int serial_writable(serial_t *obj) {
-    // check overrun
-    if (obj->uart->S1 &  UART_S1_OR_MASK) {
-        obj->uart->S1 |= UART_S1_OR_MASK;
-    }
-    return (obj->uart->S1 & UART_S1_TDRE_MASK);
-}
-
-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) {
-    obj->uart->C2 |= UART_C2_SBK_MASK; 
-}
-
-void serial_break_clear(serial_t *obj) {
-    obj->uart->C2 &= ~UART_C2_SBK_MASK;
-}
-