1 /*
2 * Copyright (c) 2022 HPMicro
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "uart.h"
17 #include "los_arch_interrupt.h"
18 #include "los_interrupt.h"
19 #include "riscv_hal.h"
20
21 #ifdef __cplusplus
22 #if __cplusplus
23 extern "C" {
24 #endif
25 #endif
26
27 #define RX_BUF_SIZE 128
28 static uint8_t rx_buf[RX_BUF_SIZE];
29 static uint16_t rx_index;
30 static uint16_t tx_index;
31
UartPutc(INT32 c,VOID * file)32 INT32 UartPutc(INT32 c, VOID *file)
33 {
34 (VOID) file;
35 if (c == '\n') {
36 uart_send_byte(HPM_UART0, (UINT8)'\r');
37 }
38 uart_send_byte(HPM_UART0, (UINT8)c);
39 return c;
40 }
41
UartGetc(VOID)42 INT32 UartGetc(VOID)
43 {
44 uint8_t c = 0;
45 if (tx_index != rx_index) {
46 c = rx_buf[tx_index++];
47 tx_index %= RX_BUF_SIZE;
48 }
49 return c;
50 }
51
UartInit(VOID)52 VOID UartInit(VOID)
53 {
54 HPM_IOC->PAD[IOC_PAD_PY07].FUNC_CTL = IOC_PY07_FUNC_CTL_UART0_RXD;
55 HPM_IOC->PAD[IOC_PAD_PY06].FUNC_CTL = IOC_PY06_FUNC_CTL_UART0_TXD;
56 /* PY port IO needs to configure PIOC as well */
57 HPM_PIOC->PAD[IOC_PAD_PY07].FUNC_CTL = IOC_PY06_FUNC_CTL_SOC_PY_06;
58 HPM_PIOC->PAD[IOC_PAD_PY06].FUNC_CTL = IOC_PY07_FUNC_CTL_SOC_PY_07;
59
60 uart_config_t config = {0};
61 clock_set_source_divider(clock_uart0, clk_src_osc24m, 1U);
62 uart_default_config(HPM_UART0, &config);
63 config.src_freq_in_hz = clock_get_frequency(clock_uart0);
64 config.baudrate = 115200;
65 uart_init(HPM_UART0, &config);
66 }
67
UartReceiveHandler(VOID)68 VOID UartReceiveHandler(VOID)
69 {
70 if (uart_get_irq_id(HPM_UART0) & uart_intr_id_rx_data_avail) {
71 uint8_t c;
72 if (status_success == uart_receive_byte(HPM_UART0, &c)) {
73 rx_buf[rx_index++] = c;
74 rx_index %= RX_BUF_SIZE;
75 if (rx_index == tx_index) {
76 tx_index++;
77 tx_index %= RX_BUF_SIZE;
78 }
79 (void)LOS_EventWrite(&g_shellInputEvent, 0x1);
80 }
81 }
82 return;
83 }
84
Uart0RxIrqRegister(VOID)85 VOID Uart0RxIrqRegister(VOID)
86 {
87 uart_enable_irq(HPM_UART0, uart_intr_rx_data_avail_or_timeout);
88
89 uint32_t ret = LOS_HwiCreate(HPM2LITEOS_IRQ(IRQn_UART0), OS_HWI_PRIO_HIGHEST, 0, (HWI_PROC_FUNC)UartReceiveHandler, 0);
90 if (ret != LOS_OK) {
91 return;
92 }
93 HalIrqEnable(HPM2LITEOS_IRQ(IRQn_UART0));
94 }
95
96 #ifdef __cplusplus
97 #if __cplusplus
98 }
99 #endif /* __cplusplus */
100 #endif /* __cplusplus */
101