mlaz commented on a change in pull request #2466: URL: https://github.com/apache/mynewt-core/pull/2466#discussion_r570619745
########## File path: hw/mcu/nxp/kinetis/src/hal_lpuart.c ########## @@ -0,0 +1,478 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 <assert.h> +#include <stdlib.h> + +#include "os/mynewt.h" +#include "hal/hal_uart.h" +#include "hal/hal_gpio.h" +#include "hal/hal_system.h" +#include "mcu/cmsis_nvic.h" +#include "bsp/bsp.h" +#include "syscfg/syscfg.h" +#include "mcu/kinetis_common.h" + +#include "fsl_clock.h" +#include "fsl_port.h" +#include "fsl_lpuart.h" + +#include "hal_lpuart_nxp.h" + +/*! @brief Ring buffer size (Unit: Byte). */ +#define TX_BUF_SZ 32 +#define RX_BUF_SZ 128 + +struct uart_ring { + uint16_t ur_head; + uint16_t ur_tail; + uint16_t ur_size; + uint8_t _pad; + uint8_t *ur_buf; +}; + +struct hal_uart { + LPUART_Type *u_base; + clock_name_t clk_src; + uint32_t u_irq; + PORT_Type *p_base; + clock_ip_name_t p_clock; + int u_pin_rx; + int u_pin_tx; + hal_uart_rx_char u_rx_func; + hal_uart_tx_char u_tx_func; + hal_uart_tx_done u_tx_done; + void *u_func_arg; + uint8_t u_configured : 1; + uint8_t u_open : 1; + uint8_t u_tx_started : 1; + uint8_t u_rx_stall : 1; + struct uart_ring ur_tx; + uint8_t tx_buffer[TX_BUF_SZ]; + struct uart_ring ur_rx; + uint8_t rx_buffer[RX_BUF_SZ]; +}; + +/* UART configurations */ +static struct hal_uart uarts[FSL_FEATURE_SOC_LPUART_COUNT]; + +static uint8_t const s_uartExists[] = NXP_UART_EXISTS; +static uint8_t const s_uartEnabled[] = NXP_UART_ENABLED; +static LPUART_Type *const s_uartBases[] = LPUART_BASE_PTRS; +static clock_name_t s_uartClocks[] = NXP_UART_CLOCKS; +static uint8_t const s_uartIRQ[] = LPUART_RX_TX_IRQS; +static PORT_Type *const s_uartPort[] = NXP_UART_PORTS; +static clock_ip_name_t const s_uartPortClocks[] = NXP_UART_PORT_CLOCKS; +static uint8_t const s_uartPIN_RX[] = NXP_UART_PIN_RX; +static uint8_t const s_uartPIN_TX[] = NXP_UART_PIN_TX; + +static void uart_irq0(void); +static void uart_irq1(void); +static void uart_irq2(void); +static void uart_irq3(void); +static void uart_irq4(void); +static void (*s_uartirqs[])(void) = { + uart_irq0, uart_irq1, uart_irq2, uart_irq3, uart_irq4 +}; + +/* + * RING BUFFER FUNCTIONS + */ + +static uint8_t +ur_is_empty(struct uart_ring *ur) +{ + return (ur->ur_head == ur->ur_tail); +} + +static uint8_t +ur_is_full(struct uart_ring *ur) +{ + return (((ur->ur_tail + 1) % ur->ur_size) == ur->ur_head); +} + +static void +ur_bump(struct uart_ring *ur) +{ + if (!ur_is_empty(ur)) { + ur->ur_head++; + ur->ur_head %= ur->ur_size; + return; + } +} + +static uint8_t +ur_read(struct uart_ring *ur) +{ + return ur->ur_buf[ur->ur_head]; +} + +static int +ur_queue(struct uart_ring *ur, uint8_t data) +{ + if (!ur_is_full(ur)) { + ur->ur_buf[ur->ur_tail] = data; + ur->ur_tail++; + ur->ur_tail %= ur->ur_size; + return 0; + } + return -1; +} + +/* + * END RING BUFFER FUNCTIONS + */ + +int +hal_uart_init_cbs(int port, + hal_uart_tx_char tx_func, + hal_uart_tx_done tx_done, + hal_uart_rx_char rx_func, + void *arg) +{ + struct hal_uart *u; + + if (port >= FSL_FEATURE_SOC_LPUART_COUNT) { + return -1; + } + u = &uarts[port]; + u->u_rx_func = rx_func; + u->u_tx_func = tx_func; + u->u_tx_done = tx_done; + u->u_func_arg = arg; + + return 0; +} + +void +hal_uart_blocking_tx(int port, uint8_t byte) +{ + struct hal_uart *u; + + if (port >= FSL_FEATURE_SOC_LPUART_COUNT) { + return; + } + u = &uarts[port]; + if (!u->u_configured || !u->u_open) { + return; + } + + LPUART_WriteBlocking(u->u_base, &byte, 1); +} + +static int +hal_uart_tx_fill_buf(struct hal_uart *u) +{ + int data = 0; + int i = 0; + os_sr_t sr; + + OS_ENTER_CRITICAL(sr); + while (!ur_is_full(&u->ur_tx)) { + if (u->u_tx_func) { + data = u->u_tx_func(u->u_func_arg); + } + if (data <= 0) { + break; + } + i++; + ur_queue(&u->ur_tx, data); + } + OS_EXIT_CRITICAL(sr); + return i; +} + +void +hal_uart_start_tx(int port) +{ + struct hal_uart *u; + int data = -1; + int rc; + + if (port >= FSL_FEATURE_SOC_LPUART_COUNT) { + return; + } + u = &uarts[port]; + if (!u->u_configured || !u->u_open) { + return; + } + + /* main loop */ + while (true) { + /* add data to TX ring buffer */ + if (u->u_tx_started == 0) { + rc = hal_uart_tx_fill_buf(u); + if (rc > 0) { + u->u_tx_started = 1; + } + } + + /* Send data only when UART TX register is empty and TX ring buffer has data to send out. */ + while (!ur_is_empty(&u->ur_tx) && + (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(u->u_base))) { + data = ur_read(&u->ur_tx); + LPUART_WriteByte(u->u_base, data); + ur_bump(&u->ur_tx); + } + + if (ur_is_empty(&u->ur_tx)) { + if (u->u_tx_done) { + u->u_tx_done(u->u_func_arg); + } + u->u_tx_started = 0; + break; + } + } +} + +void +hal_uart_start_rx(int port) +{ + struct hal_uart *u; + os_sr_t sr; + int rc = 0; + + if (port >= FSL_FEATURE_SOC_LPUART_COUNT) { + return; + } + u = &uarts[port]; + if (!u->u_configured || !u->u_open) { + return; + } + + u->u_rx_stall = 0; + + /* Send back what's in the RX ring buffer until it's empty or we get an + * error */ + while ((rc >= 0) && !ur_is_empty(&u->ur_rx)) { + OS_ENTER_CRITICAL(sr); + rc = u->u_rx_func(u->u_func_arg, ur_read(&u->ur_rx)); + if (rc >= 0) { + ur_bump(&u->ur_rx); + } else { + u->u_rx_stall = 1; + } + OS_EXIT_CRITICAL(sr); + } +} + +static void +uart_irq_handler(int port) +{ + struct hal_uart *u; + uint32_t status; + uint8_t data; + + u = &uarts[port]; + if (u->u_configured && u->u_open) { + status = LPUART_GetStatusFlags(u->u_base); + /* Check for RX data */ + if (status & (kLPUART_RxDataRegFullFlag | kLPUART_RxOverrunFlag)) { + data = LPUART_ReadByte(u->u_base); + if (u->u_rx_stall || u->u_rx_func(u->u_func_arg, data) < 0) { + /* + * RX queue full. + */ + u->u_rx_stall = 1; + ur_queue(&u->ur_rx, data); + } + } + /* Check for TX complete */ + if (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(u->u_base)) { + if (u->u_tx_started) { + u->u_tx_started = 0; + if (u->u_tx_done) { + u->u_tx_done(u->u_func_arg); + } + } + } + } +} + +static void +uart_irq0(void) +{ + uart_irq_handler(0); +} + +static void +uart_irq1(void) +{ + uart_irq_handler(1); +} + +static void +uart_irq2(void) +{ + uart_irq_handler(2); +} + +static void +uart_irq3(void) +{ + uart_irq_handler(3); +} + +static void +uart_irq4(void) +{ + uart_irq_handler(4); +} + +int +hal_uart_config(int port, + int32_t speed, + uint8_t databits, + uint8_t stopbits, + enum hal_uart_parity parity, + enum hal_uart_flow_ctl flow_ctl) +{ + struct hal_uart *u; + lpuart_config_t uconfig; + + if (port >= FSL_FEATURE_SOC_LPUART_COUNT) { + return -1; + } + u = &uarts[port]; + if (!u->u_configured || u->u_open) { + return -1; + } + + /* PIN config (all UARTs use kPORT_MuxAlt3) */ + CLOCK_EnableClock(u->p_clock); + PORT_SetPinMux(u->p_base, u->u_pin_rx, kPORT_MuxAlt3); + PORT_SetPinMux(u->p_base, u->u_pin_tx, kPORT_MuxAlt3); + + /* UART CONFIG */ + CLOCK_SetLpuartClock(2U); + + LPUART_GetDefaultConfig(&uconfig); + uconfig.baudRate_Bps = speed; + + switch (databits) { + case 8: + uconfig.dataBitsCount = kLPUART_EightDataBits; + break; + case 7: +#if FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT + uconfig.dataBitsCount = kLPUART_SevenDataBits; + break; +#endif /* Fallthrought */ + default: + uconfig.parityMode = kLPUART_ParityEven; + return -1; Review comment: hah good catch! ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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