| Marc Moreno Berengue | 20dab39 | 2017-11-29 13:18:58 +0000 | [diff] [blame] | 1 | /*
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| 2 | * Copyright (c) 2017 ARM Limited
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| 3 | *
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| 4 | * Licensed under the Apace License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apace.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 |
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| 17 | #include "uart_stdout.h"
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| 18 |
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| 19 | #include <assert.h>
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| 20 | #include <stdio.h>
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| 21 | #include <string.h>
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| 22 | #include "arm_uart_drv.h"
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| 23 | #include "Driver_USART.h"
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| 24 |
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| 25 | #define ASSERT_HIGH(X) assert(X == ARM_DRIVER_OK)
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| 26 |
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| 27 | /* Imports USART driver */
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| 28 | extern ARM_DRIVER_USART Driver_USART0;
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| 29 | extern ARM_DRIVER_USART Driver_USART1;
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| 30 |
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| 31 | /* Struct FILE is implemented in stdio.h. Used to redirect printf to UART */
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| 32 | FILE __stdout;
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| 33 |
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| 34 | /* Redirects printf to UART */
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| 35 | __attribute__ ((weak)) int fputc(int ch, FILE *f) {
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| 36 | /* Send byte to USART */
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| 37 | uart_putc(ch);
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| 38 |
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| 39 | /* Return character written */
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| 40 | return ch;
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| 41 | }
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| 42 |
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| 43 | extern struct arm_uart_dev_t ARM_UART0_DEV_S, ARM_UART0_DEV_NS;
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| 44 | extern struct arm_uart_dev_t ARM_UART1_DEV_S, ARM_UART1_DEV_NS;
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| 45 |
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| 46 | /* Generic driver to be configured and used */
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| 47 | ARM_DRIVER_USART *Driver_USART = NULL;
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| 48 |
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| 49 | void uart_init(enum uart_channel uchan)
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| 50 | {
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| 51 | int32_t ret = ARM_DRIVER_OK;
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| 52 |
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| 53 | /* Add a configuration step for the UART channel to use, 0 or 1 */
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| 54 | switch(uchan) {
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| 55 | case UART0_CHANNEL:
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| 56 | /* UART0 is configured as a non-secure peripheral, so we wouldn't be
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| 57 | * able to access it using its secure alias. Ideally, we would want
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| 58 | * to use UART1 only from S side as it's a secure peripheral, but for
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| 59 | * simplicity, leave the option to use UART0 and use a workaround
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| 60 | */
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| 61 | memcpy(&ARM_UART0_DEV_S, &ARM_UART0_DEV_NS, sizeof(struct arm_uart_dev_t));
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| 62 | Driver_USART = &Driver_USART0;
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| 63 | break;
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| 64 | case UART1_CHANNEL:
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| 65 | Driver_USART = &Driver_USART1;
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| 66 | break;
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| 67 | default:
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| 68 | ret = ARM_DRIVER_ERROR;
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| 69 | }
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| 70 | ASSERT_HIGH(ret);
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| 71 |
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| 72 | ret = Driver_USART->Initialize(NULL);
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| 73 | ASSERT_HIGH(ret);
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| 74 |
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| 75 | ret = Driver_USART->Control(ARM_USART_MODE_ASYNCHRONOUS, 115200);
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| 76 | ASSERT_HIGH(ret);
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| 77 | }
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| 78 |
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| 79 | void uart_putc(unsigned char c)
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| 80 | {
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| 81 | int32_t ret = ARM_DRIVER_OK;
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| 82 |
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| 83 | ret = Driver_USART->Send(&c, 1);
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| 84 | ASSERT_HIGH(ret);
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| 85 | }
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| 86 |
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| 87 | unsigned char uart_getc(void)
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| 88 | {
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| 89 | unsigned char c = 0;
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| 90 | int32_t ret = ARM_DRIVER_OK;
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| 91 |
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| 92 | ret = Driver_USART->Receive(&c, 1);
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| 93 | ASSERT_HIGH(ret);
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| 94 |
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| 95 | return c;
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| 96 | }
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