219 lines
7.1 KiB
C
219 lines
7.1 KiB
C
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/*Copyright 2020-2021 T-Head Semiconductor Co., Ltd.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "uart.h"
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#include "config.h"
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/* UART register bit definitions */
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#define USR_UART_BUSY 0x01
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#define LSR_DATA_READY 0x01
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#define LSR_THR_EMPTY 0x20
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#define IER_RDA_INT_ENABLE 0x01
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#define IER_THRE_INT_ENABLE 0x02
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#define IIR_NO_ISQ_PEND 0x01
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#define LCR_SET_DLAB 0x80 /* enable r/w DLR to set the baud rate */
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#define LCR_PARITY_ENABLE 0x08 /* parity enabled */
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#define LCR_PARITY_EVEN 0x10 /* Even parity enabled */
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#define LCR_PARITY_ODD 0xef /* Odd parity enabled */
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#define LCR_WORD_SIZE_5 0xfc /* the data length is 5 bits */
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#define LCR_WORD_SIZE_6 0x01 /* the data length is 6 bits */
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#define LCR_WORD_SIZE_7 0x02 /* the data length is 7 bits */
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#define LCR_WORD_SIZE_8 0x03 /* the data length is 8 bits */
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#define LCR_STOP_BIT1 0xfb /* 1 stop bit */
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#define LCR_STOP_BIT2 0x04 /* 1.5 stop bit */
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#define CK_LSR_PFE 0x80
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#define CK_LSR_TEMT 0x40
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#define CK_LSR_THRE 0x40
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#define CK_LSR_BI 0x10
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#define CK_LSR_FE 0x08
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#define CK_LSR_PE 0x04
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#define CK_LSR_OE 0x02
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#define CK_LSR_DR 0x01
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#define CK_LSR_TRANS_EMPTY 0x20
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void ck_uart_set_baudrate(p_ck_uart_device uart_device, uint32_t baudrate)
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{ /* {{{ ck_uart_set_baudrate */
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uint32_t baud_div;
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uint32_t *addr = uart_device->register_map;
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baud_div = (APB_FREQ/baudrate) >> 4;
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uart_device->baudrate = baudrate;
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*(reg8_t*)(addr+CK_UART_LCR) |= LCR_SET_DLAB;
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*(reg8_t*)(addr+CK_UART_DLL) = (baud_div & 0xFF);
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*(reg8_t*)(addr+CK_UART_DLH) = ((baud_div >> 8) & 0xFF);
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*(reg8_t*)(addr+CK_UART_LCR) &= (~LCR_SET_DLAB);
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} /* }}} */
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void ck_uart_set_parity(p_ck_uart_device uart_device, t_ck_uart_parity parity)
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{ /* {{{ ck_uart_set_parity */
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uart_device->parity = parity;
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switch (parity)
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{
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case PARITY_NONE:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= (~LCR_PARITY_ENABLE);
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break;
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case PARITY_ODD:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_PARITY_ENABLE;
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= LCR_PARITY_ODD;
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break;
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case PARITY_EVEN:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_PARITY_ENABLE;
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_PARITY_EVEN;
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break;
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default:
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break;
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}
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} /* }}} */
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void ck_uart_set_wordsize(p_ck_uart_device uart_device, t_ck_uart_wordsize wordsize)
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{ /* {{{ ck_uart_set_wordsize */
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uart_device->wordsize = wordsize;
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switch (wordsize)
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{
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case WORDSIZE_5:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= LCR_WORD_SIZE_5;
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break;
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case WORDSIZE_6:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= 0xfd;
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_WORD_SIZE_6;
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break;
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case WORDSIZE_7:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= 0xfe;
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_WORD_SIZE_7;
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break;
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case WORDSIZE_8:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_WORD_SIZE_8;
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break;
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default:
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break;
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}
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} /* }}} */
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void ck_uart_set_stopbit(p_ck_uart_device uart_device, t_ck_uart_stopbit stopbit)
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{ /* {{{ ck_uart_set_stopbit */
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uart_device->stopbit = stopbit;
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switch(stopbit)
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{
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case STOPBIT_1:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) &= LCR_STOP_BIT1;
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break;
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case STOPBIT_2:
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*(reg8_t*)(uart_device->register_map+CK_UART_LCR) |= LCR_STOP_BIT2;
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break;
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default:
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break;
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}
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} /* }}} */
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void ck_uart_set_rxmode(p_ck_uart_device uart_device, t_ck_uart_mode rxmode)
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{ /* {{{ ck_uart_set_rxmode */
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uart_device->rxmode = rxmode;
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} /* }}} */
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void ck_uart_set_txmode(p_ck_uart_device uart_device, t_ck_uart_mode txmode)
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{ /* {{{ ck_uart_set_txmode */
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uart_device->txmode = txmode;
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} /* }}} */
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/*
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* @brief open a UART device, use id to select
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* if more than one UART devices exist in SOC
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* @param uart_device: uart device handler
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* @param id: UART device ID
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* @retval 0 if success, 1 if fail
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*/
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uint32_t ck_uart_open(p_ck_uart_device uart_device, uint32_t id)
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{
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if (id == 0)
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{
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uart_device->uart_id = 0;
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uart_device->register_map = (uint32_t*)UART0_BASE_ADDR;
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*
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* @brief Initialize UART configurations from uart_cfig data structure
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* @param uart_device: uart device handler
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* @param uart_cfig: uart configurations collection, a structure datatype
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* @retval 0 if success, 1 if fail
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*/
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uint32_t ck_uart_init(p_ck_uart_device uart_device, p_ck_uart_cfig uart_cfig)
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{
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if (uart_device->uart_id == 0xFFFF)
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return 1;
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ck_uart_set_baudrate(uart_device, uart_cfig->baudrate);
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ck_uart_set_parity(uart_device, uart_cfig->parity);
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ck_uart_set_wordsize(uart_device, uart_cfig->wordsize);
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ck_uart_set_stopbit(uart_device, uart_cfig->stopbit);
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ck_uart_set_rxmode(uart_device, uart_cfig->rxmode);
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ck_uart_set_txmode(uart_device, uart_cfig->txmode);
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return 0;
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}
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/*
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* @brief close UART device handler
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* @param uart_device: uart device handler
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* @retval 0 if success, 1 if fail
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*/
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uint32_t ck_uart_close(p_ck_uart_device uart_device)
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{
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ck_uart_set_rxmode(uart_device, DISABLE);
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ck_uart_set_txmode(uart_device, DISABLE);
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uart_device->uart_id = 0xFFFF;
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return 0;
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}
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/*
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* @brief transmit a character through UART
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* @param uart_device: uart device handler
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* @param c: character needs to transmit
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* @retval 0 if success, 1 if fail
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*/
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uint32_t ck_uart_putc(p_ck_uart_device uart_device, uint8_t c)
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{
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if (uart_device->txmode == DISABLE)
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return 1;
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// wait until uart transmit buffer is empty
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while (!((*(reg8_t*)(uart_device->register_map+CK_UART_LSR)) & CK_LSR_TRANS_EMPTY));
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*(reg8_t*)(uart_device->register_map+CK_UART_THR) = c;
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return 0;
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}
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/*
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* @brief check uart device's status, busy or idle
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* @param uart_device: uart device handler
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* @retval 0 if uart is in idle, 1 if busy
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*/
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uint32_t ck_uart_status(p_ck_uart_device uart_device)
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{
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uint8_t uart_lsr;
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return 0;
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//uart_lsr = *(reg8_t*)(uart_device->register_map+CK_UART_LSR);
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if (uart_lsr & CK_LSR_TEMT)
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return 0;
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else
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return 1;
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}
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