diff options
Diffstat (limited to 'os/hal/ports/TIVA/LLD/UART/hal_uart_lld.c')
-rw-r--r-- | os/hal/ports/TIVA/LLD/UART/hal_uart_lld.c | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/os/hal/ports/TIVA/LLD/UART/hal_uart_lld.c b/os/hal/ports/TIVA/LLD/UART/hal_uart_lld.c new file mode 100644 index 0000000..374ea6d --- /dev/null +++ b/os/hal/ports/TIVA/LLD/UART/hal_uart_lld.c @@ -0,0 +1,826 @@ +/* + Copyright (C) 2014..2017 Marco Veeneman + + 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. +*/ + +/** + * @file UART/hal_uart_lld.c + * @brief Tiva low level UART driver code. + * + * @addtogroup UART + * @{ + */ + +#include "hal.h" + +#if HAL_USE_UART || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/** @brief UART0 UART driver identifier.*/ +#if TIVA_UART_USE_UART0 || defined(__DOXYGEN__) +UARTDriver UARTD1; +#endif + +/** @brief UART1 UART driver identifier.*/ +#if TIVA_UART_USE_UART1 || defined(__DOXYGEN__) +UARTDriver UARTD2; +#endif + +/** @brief UART2 UART driver identifier.*/ +#if TIVA_UART_USE_UART2 || defined(__DOXYGEN__) +UARTDriver UARTD3; +#endif + +/** @brief UART3 UART driver identifier.*/ +#if TIVA_UART_USE_UART3 || defined(__DOXYGEN__) +UARTDriver UARTD4; +#endif + +/** @brief UART4 UART driver identifier.*/ +#if TIVA_UART_USE_UART4 || defined(__DOXYGEN__) +UARTDriver UARTD5; +#endif + +/** @brief UART5 UART driver identifier.*/ +#if TIVA_UART_USE_UART5 || defined(__DOXYGEN__) +UARTDriver UARTD6; +#endif + +/** @brief UART6 UART driver identifier.*/ +#if TIVA_UART_USE_UART6 || defined(__DOXYGEN__) +UARTDriver UARTD7; +#endif + +/** @brief UART7 UART driver identifier.*/ +#if TIVA_UART_USE_UART7 || defined(__DOXYGEN__) +UARTDriver UARTD8; +#endif + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +/** + * @brief Status bits translation. + * + * @param[in] err UART LSR register value + * + * @return The error flags. + */ +static uartflags_t translate_errors(uint32_t err) +{ + uartflags_t sts = 0; + + if (err & UART_MIS_FEMIS) + sts |= UART_FRAMING_ERROR; + if (err & UART_MIS_PEMIS) + sts |= UART_PARITY_ERROR; + if (err & UART_MIS_BEMIS) + sts |= UART_BREAK_DETECTED; + if (err & UART_MIS_OEMIS) + sts |= UART_OVERRUN_ERROR; + + return sts; +} + +/** + * @brief Puts the receiver in the UART_RX_IDLE state. + * + * @param[in] uartp pointer to the @p UARTDriver object + */ +static void uart_enter_rx_idle_loop(UARTDriver *uartp) +{ + tiva_udma_table_entry_t *primary = udmaControlTable.primary; + + dmaChannelDisable(uartp->dmarxnr); + + /* Configure for 8-bit transfers.*/ + primary[uartp->dmarxnr].srcendp = (void *)(uartp->uart + UART_O_DR); + primary[uartp->dmarxnr].dstendp = (volatile void *)&uartp->rxbuf; + primary[uartp->dmarxnr].chctl = UDMA_CHCTL_DSTSIZE_8 | UDMA_CHCTL_DSTINC_8 | + UDMA_CHCTL_SRCSIZE_8 | UDMA_CHCTL_SRCINC_NONE | + UDMA_CHCTL_ARBSIZE_4 | + UDMA_CHCTL_XFERSIZE(1) | + UDMA_CHCTL_XFERMODE_BASIC; + + dmaChannelSingleBurst(uartp->dmarxnr); + dmaChannelPrimary(uartp->dmarxnr); + dmaChannelPriorityDefault(uartp->dmarxnr); + dmaChannelEnableRequest(uartp->dmarxnr); + + /* Enable DMA channel, transfer starts immediately.*/ + dmaChannelEnable(uartp->dmarxnr); +} + +/** + * @brief UART de-initialization. + * + * @param[in] uartp pointer to the @p UARTDriver object + */ +static void uart_stop(UARTDriver *uartp) +{ + /* Stops RX and TX DMA channels.*/ + dmaChannelDisable(uartp->dmarxnr); + dmaChannelDisable(uartp->dmatxnr); + + /* Stops USART operations.*/ + HWREG(uartp->uart + UART_O_CTL) &= ~UART_CTL_UARTEN; +} + +/** + * @brief UART initialization. + * + * @param[in] uartp pointer to a @p UARTDriver object + */ +static void uart_init(UARTDriver *uartp) +{ + uint32_t u = uartp->uart; + const UARTConfig *config = uartp->config; + uint32_t brd; + uint32_t speed = config->speed; + uint32_t clock_source; + + if (uartp->config->ctl & UART_CTL_HSE) { + /* High speed mode is enabled, half the baud rate to compensate + * for high speed mode.*/ + speed = (speed + 1) / 2; + } + + if ((config->cc & UART_CC_CS_M) == UART_CC_CS_SYSCLK) { + /* UART is clocked using the SYSCLK.*/ + clock_source = TIVA_SYSCLK * 8; + } + else { + /* UART is clocked using the PIOSC.*/ + clock_source = 16000000 * 8; + } + + /* Calculate the baud rate divisor */ + brd = ((clock_source / speed) + 1) / 2; + + /* Disable UART.*/ + HWREG(u + UART_O_CTL) &= ~UART_CTL_UARTEN; + + /* Set baud rate.*/ + HWREG(u + UART_O_IBRD) = brd / 64; + HWREG(u + UART_O_FBRD) = brd % 64; + + /* Line control/*/ + HWREG(u + UART_O_LCRH) = config->lcrh; + + /* Select clock source.*/ + HWREG(u + UART_O_CC) = config->cc & UART_CC_CS_M; + + /* FIFO configuration.*/ + HWREG(u + UART_O_IFLS) = config->ifls & (UART_IFLS_RX_M | UART_IFLS_TX_M); + + /* Enable interrupts.*/ + HWREG(u + UART_O_IM) = UART_IM_TXIM | UART_IM_OEIM | UART_IM_BEIM | UART_IM_PEIM | UART_IM_FEIM; + + /* Enable DMA for the UART */ + HWREG(u + UART_O_DMACTL) = UART_DMACTL_TXDMAE | UART_DMACTL_RXDMAE | UART_DMACTL_DMAERR; + + /* Note that some bits are enforced.*/ + HWREG(u + UART_O_CTL) = config->ctl | UART_CTL_RXE | UART_CTL_TXE | UART_CTL_UARTEN | UART_CTL_EOT; + + /* Starting the receiver idle loop.*/ + uart_enter_rx_idle_loop(uartp); +} + +/** + * @brief UART common service routine. + * + * @param[in] uartp pointer to the @p UARTDriver object + */ +static void uart_serve_interrupt(UARTDriver *uartp) +{ + uint32_t dmachis = HWREG(UDMA_CHIS); + uint32_t mis = HWREG(uartp->uart + UART_O_MIS); + + if (mis & UART_MIS_TXMIS) { + /* End of transfer */ + _uart_tx2_isr_code(uartp); + } + + if (mis & (UART_MIS_OEMIS | UART_MIS_BEMIS | UART_MIS_PEMIS | UART_MIS_FEMIS)) { + /* Error occurred */ + _uart_rx_error_isr_code(uartp, translate_errors(mis)); + } + + if (dmachis & (1 << uartp->dmarxnr)) { + if (uartp->rxstate == UART_RX_IDLE) { + /* Receiver in idle state, a callback is generated, if enabled, for each + received character and then the driver stays in the same state.*/ + _uart_rx_idle_code(uartp); + uart_enter_rx_idle_loop(uartp); + } + else { + /* Receiver in active state, a callback is generated, if enabled, after + a completed transfer.*/ + _uart_rx_complete_isr_code(uartp); + } + } + + if (dmachis & (1 << uartp->dmatxnr)) { + /* A callback is generated, if enabled, after a completed transfer.*/ + _uart_tx1_isr_code(uartp); + } +} + +/*===========================================================================*/ +/* Driver interrupt handlers. */ +/*===========================================================================*/ + +#if TIVA_UART_USE_UART0 || defined(__DOXYGEN__) +#if !defined(TIVA_UART0_HANDLER) +#error "TIVA_UART0_HANDLER not defined" +#endif +/** + * @brief UART0 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART0_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD1); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART1 || defined(__DOXYGEN__) +#if !defined(TIVA_UART1_HANDLER) +#error "TIVA_UART1_HANDLER not defined" +#endif +/** + * @brief UART1 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART1_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD2); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART2 || defined(__DOXYGEN__) +#if !defined(TIVA_UART2_HANDLER) +#error "TIVA_UART2_HANDLER not defined" +#endif +/** + * @brief UART2 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART2_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD3); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART3 || defined(__DOXYGEN__) +#if !defined(TIVA_UART3_HANDLER) +#error "TIVA_UART3_HANDLER not defined" +#endif +/** + * @brief UART3 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART3_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD4); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART4 || defined(__DOXYGEN__) +#if !defined(TIVA_UART4_HANDLER) +#error "TIVA_UART4_HANDLER not defined" +#endif +/** + * @brief UART4 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART4_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD5); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART5 || defined(__DOXYGEN__) +#if !defined(TIVA_UART5_HANDLER) +#error "TIVA_UART5_HANDLER not defined" +#endif +/** + * @brief UART5 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART5_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD6); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART6 || defined(__DOXYGEN__) +#if !defined(TIVA_UART6_HANDLER) +#error "TIVA_UART6_HANDLER not defined" +#endif +/** + * @brief UART6 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART6_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD7); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +#if TIVA_UART_USE_UART7 || defined(__DOXYGEN__) +#if !defined(TIVA_UART7_HANDLER) +#error "TIVA_UART7_HANDLER not defined" +#endif +/** + * @brief UART7 interrupt handler. + * + * @isr + */ +OSAL_IRQ_HANDLER(TIVA_UART7_HANDLER) +{ + OSAL_IRQ_PROLOGUE(); + + uart_serve_interrupt(&UARTD8); + + OSAL_IRQ_EPILOGUE(); +} +#endif + +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Low level UART driver initialization. + * + * @notapi + */ +void uart_lld_init(void) +{ +#if TIVA_UART_USE_UART0 + uartObjectInit(&UARTD1); + UARTD1.uart = UART0_BASE; + UARTD1.dmarxnr = TIVA_UART_UART0_RX_UDMA_CHANNEL; + UARTD1.dmatxnr = TIVA_UART_UART0_TX_UDMA_CHANNEL; + UARTD1.rxchnmap = TIVA_UART_UART0_RX_UDMA_MAPPING; + UARTD1.txchnmap = TIVA_UART_UART0_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART1 + uartObjectInit(&UARTD2); + UARTD2.uart = UART1_BASE; + UARTD2.dmarxnr = TIVA_UART_UART1_RX_UDMA_CHANNEL; + UARTD2.dmatxnr = TIVA_UART_UART1_TX_UDMA_CHANNEL; + UARTD2.rxchnmap = TIVA_UART_UART1_RX_UDMA_MAPPING; + UARTD2.txchnmap = TIVA_UART_UART1_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART2 + uartObjectInit(&UARTD3); + UARTD2.uart = UART2_BASE; + UARTD2.dmarxnr = TIVA_UART_UART2_RX_UDMA_CHANNEL; + UARTD2.dmatxnr = TIVA_UART_UART2_TX_UDMA_CHANNEL; + UARTD2.rxchnmap = TIVA_UART_UART2_RX_UDMA_MAPPING; + UARTD2.txchnmap = TIVA_UART_UART2_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART3 + uartObjectInit(&UARTD4); + UARTD4.uart = UART3_BASE; + UARTD4.dmarxnr = TIVA_UART_UART3_RX_UDMA_CHANNEL; + UARTD4.dmatxnr = TIVA_UART_UART3_TX_UDMA_CHANNEL; + UARTD4.rxchnmap = TIVA_UART_UART3_RX_UDMA_MAPPING; + UARTD4.txchnmap = TIVA_UART_UART3_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART4 + uartObjectInit(&UARTD5); + UARTD5.uart = UART4_BASE; + UARTD5.dmarxnr = TIVA_UART_UART4_RX_UDMA_CHANNEL; + UARTD5.dmatxnr = TIVA_UART_UART4_TX_UDMA_CHANNEL; + UARTD5.rxchnmap = TIVA_UART_UART4_RX_UDMA_MAPPING; + UARTD5.txchnmap = TIVA_UART_UART4_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART5 + uartObjectInit(&UARTD6); + UARTD6.uart = UART5_BASE; + UARTD6.dmarxnr = TIVA_UART_UART5_RX_UDMA_CHANNEL; + UARTD6.dmatxnr = TIVA_UART_UART5_TX_UDMA_CHANNEL; + UARTD6.rxchnmap = TIVA_UART_UART5_RX_UDMA_MAPPING; + UARTD6.txchnmap = TIVA_UART_UART5_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART6 + uartObjectInit(&UARTD7); + UARTD7.uart = UART6_BASE; + UARTD7.dmarxnr = TIVA_UART_UART6_RX_UDMA_CHANNEL; + UARTD7.dmatxnr = TIVA_UART_UART6_TX_UDMA_CHANNEL; + UARTD7.rxchnmap = TIVA_UART_UART6_RX_UDMA_MAPPING; + UARTD7.txchnmap = TIVA_UART_UART6_TX_UDMA_MAPPING; +#endif +#if TIVA_UART_USE_UART7 + uartObjectInit(&UARTD8); + UARTD8.uart = UART7_BASE; + UARTD8.dmarxnr = TIVA_UART_UART7_RX_UDMA_CHANNEL; + UARTD8.dmatxnr = TIVA_UART_UART7_TX_UDMA_CHANNEL; + UARTD8.rxchnmap = TIVA_UART_UART7_RX_UDMA_MAPPING; + UARTD8.txchnmap = TIVA_UART_UART7_TX_UDMA_MAPPING; +#endif +} + +/** + * @brief Configures and activates the UART peripheral. + * + * @param[in] uartp pointer to the @p UARTDriver object + * + * @notapi + */ +void uart_lld_start(UARTDriver *uartp) { + + if (uartp->state == UART_STOP) { +#if TIVA_UART_USE_UART0 + if (&UARTD1 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 0); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 0))) + ; + + nvicEnableVector(TIVA_UART0_NUMBER, TIVA_UART_UART0_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART1 + if (&UARTD2 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 1); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 1))) + ; + + nvicEnableVector(TIVA_UART1_NUMBER, TIVA_UART_UART1_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART2 + if (&UARTD3 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 2); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 2))) + ; + + nvicEnableVector(TIVA_UART2_NUMBER, TIVA_UART_UART2_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART3 + if (&UARTD4 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 3); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 3))) + ; + + nvicEnableVector(TIVA_UART3_NUMBER, TIVA_UART_UART3_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART4 + if (&UARTD5 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 4); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 4))) + ; + + nvicEnableVector(TIVA_UART4_NUMBER, TIVA_UART_UART4_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART5 + if (&UARTD6 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 5); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 5))) + ; + + nvicEnableVector(TIVA_UART5_NUMBER, TIVA_UART_UART5_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART6 + if (&UARTD7 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 6); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 6))) + ; + + nvicEnableVector(TIVA_UART6_NUMBER, TIVA_UART_UART6_PRIORITY); + } +#endif +#if TIVA_UART_USE_UART7 + if (&UARTD8 == uartp) { + bool b; + b = udmaChannelAllocate(uartp->dmarxnr); + osalDbgAssert(!b, "channel already allocated"); + b = udmaChannelAllocate(uartp->dmatxnr); + osalDbgAssert(!b, "channel already allocated"); + + HWREG(SYSCTL_RCGCUART) |= (1 << 7); + + while (!(HWREG(SYSCTL_PRUART) & (1 << 7))) + ; + + nvicEnableVector(TIVA_UART7_NUMBER, TIVA_UART_UART7_PRIORITY); + } +#endif + + uartp->rxbuf = 0; + + HWREG(UDMA_CHMAP0 + (uartp->dmarxnr / 8) * 4) |= (uartp->rxchnmap << (uartp->dmarxnr % 8)); + HWREG(UDMA_CHMAP0 + (uartp->dmatxnr / 8) * 4) |= (uartp->txchnmap << (uartp->dmatxnr % 8)); + } + + uartp->rxstate = UART_RX_IDLE; + uartp->txstate = UART_TX_IDLE; + uart_init(uartp); +} + +/** + * @brief Deactivates the UART peripheral. + * + * @param[in] uartp pointer to the @p UARTDriver object + * + * @notapi + */ +void uart_lld_stop(UARTDriver *uartp) { + + if (uartp->state == UART_READY) { + uart_stop(uartp); + udmaChannelRelease(uartp->dmarxnr); + udmaChannelRelease(uartp->dmatxnr); + +#if TIVA_UART_USE_UART0 + if (&UARTD1 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 0); + return; + } +#endif +#if TIVA_UART_USE_UART1 + if (&UARTD2 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 1); + return; + } +#endif +#if TIVA_UART_USE_UART2 + if (&UARTD3 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 2); + return; + } +#endif +#if TIVA_UART_USE_UART3 + if (&UARTD4 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 3); + return; + } +#endif +#if TIVA_UART_USE_UART4 + if (&UARTD5 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 4); + return; + } +#endif +#if TIVA_UART_USE_UART5 + if (&UARTD6 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 5); + return; + } +#endif +#if TIVA_UART_USE_UART6 + if (&UARTD7 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 6); + return; + } +#endif +#if TIVA_UART_USE_UART7 + if (&UARTD8 == uartp) { + HWREG(SYSCTL_RCGCUART) &= ~(1 << 7); + return; + } +#endif + } +} + +/** + * @brief Starts a transmission on the UART peripheral. + * @note The buffers are organized as uint8_t arrays for data sizes below + * or equal to 8 bits else it is organized as uint16_t arrays. + * + * @param[in] uartp pointer to the @p UARTDriver object + * @param[in] n number of data frames to send + * @param[in] txbuf the pointer to the transmit buffer + * + * @notapi + */ +void uart_lld_start_send(UARTDriver *uartp, size_t n, const void *txbuf) +{ + tiva_udma_table_entry_t *primary = udmaControlTable.primary; + + /* TODO: This assert should be moved to the dma helper driver */ + osalDbgAssert((uint32_t)txbuf >= SRAM_BASE, "txbuf should be in SRAM region."); + + dmaChannelDisable(uartp->dmatxnr); + + /* Configure for 8-bit transfers.*/ + primary[uartp->dmatxnr].srcendp = (volatile void *)txbuf+n-1; + primary[uartp->dmatxnr].dstendp = (void *)(uartp->uart + UART_O_DR); + primary[uartp->dmatxnr].chctl = UDMA_CHCTL_DSTSIZE_8 | UDMA_CHCTL_DSTINC_NONE | + UDMA_CHCTL_SRCSIZE_8 | UDMA_CHCTL_SRCINC_8 | + UDMA_CHCTL_ARBSIZE_4 | + UDMA_CHCTL_XFERSIZE(n) | + UDMA_CHCTL_XFERMODE_BASIC; + + dmaChannelSingleBurst(uartp->dmatxnr); + dmaChannelPrimary(uartp->dmatxnr); + dmaChannelPriorityDefault(uartp->dmatxnr); + dmaChannelEnableRequest(uartp->dmatxnr); + + /* Enable DMA channel, transfer starts immediately.*/ + dmaChannelEnable(uartp->dmatxnr); +} + +/** + * @brief Stops any ongoing transmission. + * @note Stopping a transmission also suppresses the transmission callbacks. + * + * @param[in] uartp pointer to the @p UARTDriver object + * + * @return The number of data frames not transmitted by the + * stopped transmit operation. + * + * @notapi + */ +size_t uart_lld_stop_send(UARTDriver *uartp) +{ + tiva_udma_table_entry_t *primary = udmaControlTable.primary; + uint16_t left; + + dmaChannelDisable(uartp->dmatxnr); + + left = ((primary[uartp->dmatxnr].chctl & UDMA_CHCTL_XFERSIZE_M) + 1) >> 4; + + return left; +} + +/** + * @brief Starts a receive operation on the UART peripheral. + * @note The buffers are organized as uint8_t arrays for data sizes below + * or equal to 8 bits else it is organized as uint16_t arrays. + * + * @param[in] uartp pointer to the @p UARTDriver object + * @param[in] n number of data frames to send + * @param[out] rxbuf the pointer to the receive buffer + * + * @notapi + */ +void uart_lld_start_receive(UARTDriver *uartp, size_t n, void *rxbuf) +{ + tiva_udma_table_entry_t *primary = udmaControlTable.primary; + + /* TODO: This assert should be moved to the dma helper driver */ + osalDbgAssert((uint32_t)rxbuf >= SRAM_BASE, "rxbuf should be in SRAM region."); + + dmaChannelDisable(uartp->dmarxnr); + + /* Configure for 8-bit transfers.*/ + primary[uartp->dmarxnr].srcendp = (void *)(uartp->uart + UART_O_DR); + primary[uartp->dmarxnr].dstendp = (volatile void *)rxbuf+n-1; + primary[uartp->dmarxnr].chctl = UDMA_CHCTL_DSTSIZE_8 | UDMA_CHCTL_DSTINC_8 | + UDMA_CHCTL_SRCSIZE_8 | UDMA_CHCTL_SRCINC_NONE | + UDMA_CHCTL_ARBSIZE_4 | + UDMA_CHCTL_XFERSIZE(n) | + UDMA_CHCTL_XFERMODE_BASIC; + + dmaChannelSingleBurst(uartp->dmarxnr); + dmaChannelPrimary(uartp->dmarxnr); + dmaChannelPriorityDefault(uartp->dmarxnr); + dmaChannelEnableRequest(uartp->dmarxnr); + + /* Enable DMA channel, transfer starts immediately.*/ + dmaChannelEnable(uartp->dmarxnr); +} + +/** + * @brief Stops any ongoing receive operation. + * @note Stopping a receive operation also suppresses the receive callbacks. + * + * @param[in] uartp pointer to the @p UARTDriver object + * + * @return The number of data frames not received by the + * stopped receive operation. + * + * @notapi + */ +size_t uart_lld_stop_receive(UARTDriver *uartp) +{ + tiva_udma_table_entry_t *primary = udmaControlTable.primary; + uint16_t left; + + dmaChannelDisable(uartp->dmatxnr); + + left = ((primary[uartp->dmatxnr].chctl & UDMA_CHCTL_XFERSIZE_M) + 1) >> 4; + + uart_enter_rx_idle_loop(uartp); + + return left; +} + +#endif /* HAL_USE_UART */ + +/** @} */ |