mbed library sources
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Diff: targets/hal/TARGET_NORDIC/TARGET_NRF51822/serial_api.c
- Revision:
- 85:e1a8e879a6a9
- Child:
- 104:a6a92e2e5a92
diff -r f54042cbc282 -r e1a8e879a6a9 targets/hal/TARGET_NORDIC/TARGET_NRF51822/serial_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_NORDIC/TARGET_NRF51822/serial_api.c Fri Feb 07 18:00:11 2014 +0000 @@ -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. + */ +// 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 1 + +static const PinMap PinMap_UART_TX[] = { + {TX_PIN_NUMBER, UART_0, 1}, + { NC , NC , 0} +}; + +static const PinMap PinMap_UART_RX[] = { + {RX_PIN_NUMBER, UART_0, 1}, + {NC , NC , 0} +}; + +static uint32_t serial_irq_ids[UART_NUM] = {0}; +static uart_irq_handler irq_handler; +static uint32_t acceptedSpeeds[16][2] = {{1200,UART_BAUDRATE_BAUDRATE_Baud1200}, + {2400,UART_BAUDRATE_BAUDRATE_Baud2400}, + {4800,UART_BAUDRATE_BAUDRATE_Baud4800}, + {9600,UART_BAUDRATE_BAUDRATE_Baud9600}, + {14400,UART_BAUDRATE_BAUDRATE_Baud14400}, + {19200,UART_BAUDRATE_BAUDRATE_Baud19200}, + {28800,UART_BAUDRATE_BAUDRATE_Baud28800}, + {38400,UART_BAUDRATE_BAUDRATE_Baud38400}, + {57600,UART_BAUDRATE_BAUDRATE_Baud57600}, + {76800,UART_BAUDRATE_BAUDRATE_Baud76800}, + {115200,UART_BAUDRATE_BAUDRATE_Baud115200}, + {230400,UART_BAUDRATE_BAUDRATE_Baud230400}, + {250000,UART_BAUDRATE_BAUDRATE_Baud250000}, + {460800,UART_BAUDRATE_BAUDRATE_Baud460800}, + {921600,UART_BAUDRATE_BAUDRATE_Baud921600}, + {1000000,UART_BAUDRATE_BAUDRATE_Baud1M}}; + +int stdio_uart_inited = 0; +serial_t stdio_uart; + + +void serial_init(serial_t *obj, PinName tx, PinName rx) { + // determine the UART to use -- for mcu's with multiple uart connections + 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 = (NRF_UART_Type *)uart; + + //pin configurations -- + //outputs + NRF_GPIO->DIR |= (1<<tx);//TX_PIN_NUMBER); + NRF_GPIO->DIR |= (1<<RTS_PIN_NUMBER); + + NRF_GPIO->DIR &= ~(1<<rx);//RX_PIN_NUMBER); + NRF_GPIO->DIR &= ~(1<<CTS_PIN_NUMBER); + + obj->uart->PSELRTS = RTS_PIN_NUMBER; + obj->uart->PSELTXD = tx;//TX_PIN_NUMBER; + + //inputs + obj->uart->PSELCTS = CTS_PIN_NUMBER; + obj->uart->PSELRXD = rx;//RX_PIN_NUMBER; + + + // set default baud rate and format + serial_baud (obj, 9600); + serial_format(obj, 8, ParityNone, 1); + + obj->uart->ENABLE = (UART_ENABLE_ENABLE_Enabled << UART_ENABLE_ENABLE_Pos);; + obj->uart->TASKS_STARTTX = 1; + obj->uart->TASKS_STARTRX = 1; + obj->uart->EVENTS_RXDRDY =0; + + obj->index = 0; + + // set rx/tx pins in PullUp mode + pin_mode(tx, PullUp); + pin_mode(rx, PullUp); + + 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 +void serial_baud(serial_t *obj, int baudrate) { + if(baudrate<=1200){ + obj->uart->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1200; + return; + } + + for(int i=1;i<16;i++){ + if(baudrate<acceptedSpeeds[i][0]){ + obj->uart->BAUDRATE = acceptedSpeeds[i-1][1]; + return; + } + } + obj->uart->BAUDRATE = UART_BAUDRATE_BAUDRATE_Baud1M; +} + +void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits) { + // 0: 1 stop bits, 1: 2 stop bits + // int parity_enable, parity_select; + switch (parity) { + case ParityNone: + obj->uart->CONFIG = 0; + break; + default: + obj->uart->CONFIG = (UART_CONFIG_PARITY_Included<<UART_CONFIG_PARITY_Pos); + return; + } + //no Flow Control +} + +//****************************************************************************** +// * INTERRUPT HANDLING +//****************************************************************************** +static inline void uart_irq(uint32_t iir, uint32_t index) { + 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); + } +} +#ifdef __cplusplus +extern "C" { +#endif +void UART0_IRQHandler() +{ + uint32_t irtype =0; + + if(NRF_UART0->EVENTS_TXDRDY){ + irtype =1; + } + else if(NRF_UART0->EVENTS_RXDRDY){ + irtype =2; + } + uart_irq(irtype, 0); +} +#ifdef __cplusplus +} +#endif +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; + + switch ((int)obj->uart) { + case UART_0: irq_n=UART0_IRQn ; + break; + } + + if (enable) { + switch (irq) { + case RxIrq: obj->uart->INTENSET |= (UART_INTENSET_RXDRDY_Msk);break; + case TxIrq: obj->uart->INTENSET |= (UART_INTENSET_TXDRDY_Msk);break; + } + NVIC_SetPriority(irq_n, 3); + NVIC_EnableIRQ(irq_n); + } + else { // disable + int all_disabled = 0; + switch (irq) { + case RxIrq: obj->uart->INTENSET &= ~(UART_INTENSET_RXDRDY_Msk); + all_disabled = (obj->uart->INTENSET& (UART_INTENSET_TXDRDY_Msk))==0; + break; + case TxIrq: obj->uart->INTENSET &= ~(UART_INTENSET_TXDRDY_Msk); + all_disabled = (obj->uart->INTENSET& (UART_INTENSET_RXDRDY_Msk))==0; + break; + } + + if (all_disabled){ + NVIC_DisableIRQ(irq_n); + } + } +} + +//****************************************************************************** +//* READ/WRITE +//****************************************************************************** +int serial_getc(serial_t *obj) { + while (!serial_readable(obj)); + + obj->uart->EVENTS_RXDRDY = 0; + + return (uint8_t)obj->uart->RXD; +} + +void serial_putc(serial_t *obj, int c) { + obj->uart->TXD = (uint8_t)c; + + while (!serial_writable(obj)); + + obj->uart->EVENTS_TXDRDY =0; +} + +int serial_readable(serial_t *obj) { + return (obj->uart->EVENTS_RXDRDY == 1); +} + +int serial_writable(serial_t *obj) { + return (obj->uart->EVENTS_TXDRDY ==1); +} + +void serial_break_set(serial_t *obj) { + obj->uart->TASKS_SUSPEND = 1; +} + +void serial_break_clear(serial_t *obj) { + obj->uart->TASKS_STARTTX = 1; + obj->uart->TASKS_STARTRX = 1; +}