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Diff: vendor/NXP/LPC4088/hal/serial_api.c
- Revision:
- 13:0645d8841f51
- Parent:
- 12:5fa2273de5db
- Child:
- 14:096882eb0961
--- a/vendor/NXP/LPC4088/hal/serial_api.c Wed Jul 24 11:11:21 2013 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,302 +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
- ******************************************************************************/
-static const PinMap PinMap_UART_TX[] = {
- {P0_0, UART_3, 2},
- {P0_2, UART_0, 1},
- {P0_10, UART_2, 1},
- {P0_15, UART_1, 1},
- {P1_29, UART_4, 5},
- {P0_25, UART_3, 3},
- {P2_0 , UART_1, 2},
- {P2_8 , UART_2, 2},
- {P3_16, UART_1, 3},
- {P4_22, UART_2, 2},
- {P4_28, UART_3, 2},
- {P5_4, UART_4, 4},
- {NC , NC , 0}
-};
-
-static const PinMap PinMap_UART_RX[] = {
- {P0_1 , UART_3, 2},
- {P0_3 , UART_0, 1},
- {P0_11, UART_2, 1},
- {P0_16, UART_1, 1},
- {P0_26, UART_3, 3},
- {P2_1 , UART_1, 2},
- {P2_9 , UART_2, 2},
- {P3_17, UART_1, 3},
- {P4_23, UART_2, 2},
- {P4_29, UART_3, 2},
- {P5_3, UART_4, 4},
- {NC , NC , 0}
-};
-
-#define UART_NUM 5
-
-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;
-
- // 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 = (LPC_UART_TypeDef *)uart;
- // enable power
- switch (uart) {
- case UART_0: LPC_SC->PCONP |= 1 << 3; break;
- case UART_1: LPC_SC->PCONP |= 1 << 4; break;
- case UART_2: LPC_SC->PCONP |= 1 << 24; break;
- case UART_3: LPC_SC->PCONP |= 1 << 25; break;
- case UART_4: LPC_SC->PCONP |= 1 << 8; break;
- }
-
- // enable fifos and default rx trigger level
- obj->uart->FCR = 1 << 0 // FIFO Enable - 0 = Disables, 1 = Enabled
- | 0 << 1 // Rx Fifo Reset
- | 0 << 2 // Tx Fifo Reset
- | 0 << 6; // Rx irq trigger level - 0 = 1 char, 1 = 4 chars, 2 = 8 chars, 3 = 14 chars
-
- // disable irqs
- obj->uart->IER = 0 << 0 // Rx Data available irq enable
- | 0 << 1 // Tx Fifo empty irq enable
- | 0 << 2; // Rx Line Status irq enable
-
- // 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);
-
- switch (uart) {
- case UART_0: obj->index = 0; break;
- case UART_1: obj->index = 1; break;
- case UART_2: obj->index = 2; break;
- case UART_3: obj->index = 3; break;
- case UART_4: obj->index = 4; break;
- }
-
- 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_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) {
- uint32_t PCLK = PeripheralClock;
-
- // 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);
-
- uint8_t DivAddVal = 0;
- uint8_t MulVal = 1;
- int hit = 0;
- uint16_t dlv;
- uint8_t mv, dav;
- if ((PCLK % (16 * baudrate)) != 0) { // Checking for zero remainder
- float err_best = (float) baudrate;
- uint16_t dlmax = DL;
- for ( dlv = (dlmax/2); (dlv <= dlmax) && !hit; dlv++) {
- for ( mv = 1; mv <= 15; mv++) {
- for ( dav = 1; dav < mv; dav++) {
- float ratio = 1.0f + ((float) dav / (float) mv);
- float calcbaud = (float)PCLK / (16.0f * (float) dlv * ratio);
- float err = fabs(((float) baudrate - calcbaud) / (float) baudrate);
- if (err < err_best) {
- DL = dlv;
- DivAddVal = dav;
- MulVal = mv;
- err_best = err;
- if (err < 0.001f) {
- hit = 1;
- }
- }
- }
- }
- }
- }
-
- // set LCR[DLAB] to enable writing to divider registers
- obj->uart->LCR |= (1 << 7);
-
- // set divider values
- obj->uart->DLM = (DL >> 8) & 0xFF;
- obj->uart->DLL = (DL >> 0) & 0xFF;
- obj->uart->FDR = (uint32_t) DivAddVal << 0
- | (uint32_t) MulVal << 4;
-
- // clear LCR[DLAB]
- obj->uart->LCR &= ~(1 << 7);
-}
-
-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: 5 data bits ... 3: 8 data bits
- if (data_bits < 5 || data_bits > 8) {
- error("Invalid number of bits (%d) in serial format, should be 5..8", data_bits);
- }
- data_bits -= 5;
-
- int parity_enable, parity_select;
- switch (parity) {
- case ParityNone: parity_enable = 0; parity_select = 0; break;
- case ParityOdd : parity_enable = 1; parity_select = 0; break;
- case ParityEven: parity_enable = 1; parity_select = 1; break;
- case ParityForced1: parity_enable = 1; parity_select = 2; break;
- case ParityForced0: parity_enable = 1; parity_select = 3; break;
- default:
- error("Invalid serial parity setting");
- return;
- }
-
- obj->uart->LCR = data_bits << 0
- | stop_bits << 2
- | parity_enable << 3
- | parity_select << 4;
-}
-
-/******************************************************************************
- * 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_UART0->IIR >> 1) & 0x7, 0);}
-void uart1_irq() {uart_irq((LPC_UART1->IIR >> 1) & 0x7, 1);}
-void uart2_irq() {uart_irq((LPC_UART2->IIR >> 1) & 0x7, 2);}
-void uart3_irq() {uart_irq((LPC_UART3->IIR >> 1) & 0x7, 3);}
-void uart4_irq() {uart_irq((LPC_UART4->IIR >> 1) & 0x7, 4);}
-
-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;
- case UART_3: irq_n=UART3_IRQn; vector = (uint32_t)&uart3_irq; break;
- case UART_4: irq_n=UART4_IRQn; vector = (uint32_t)&uart4_irq; break;
- }
-
- if (enable) {
- obj->uart->IER |= 1 << irq;
- NVIC_SetVector(irq_n, vector);
- NVIC_EnableIRQ(irq_n);
- } else { // disable
- int all_disabled = 0;
- SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
- obj->uart->IER &= ~(1 << irq);
- all_disabled = (obj->uart->IER & (1 << other_irq)) == 0;
- if (all_disabled)
- NVIC_DisableIRQ(irq_n);
- }
-}
-
-/******************************************************************************
- * READ/WRITE
- ******************************************************************************/
-int serial_getc(serial_t *obj) {
- while (!serial_readable(obj));
- return obj->uart->RBR;
-}
-
-void serial_putc(serial_t *obj, int c) {
- while (!serial_writable(obj));
- obj->uart->THR = c;
-
- uint32_t lsr = obj->uart->LSR;
- lsr = lsr;
- uint32_t thr = obj->uart->THR;
- thr = thr;
-}
-
-int serial_readable(serial_t *obj) {
- return obj->uart->LSR & 0x01;
-}
-
-int serial_writable(serial_t *obj) {
- return obj->uart->LSR & 0x20;
-}
-
-void serial_clear(serial_t *obj) {
- obj->uart->FCR = 1 << 1 // rx FIFO reset
- | 1 << 2 // tx FIFO reset
- | 0 << 6; // interrupt depth
-}
-
-void serial_pinout_tx(PinName tx) {
- pinmap_pinout(tx, PinMap_UART_TX);
-}