| // Copyright lowRISC contributors. |
| // Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| // SPDX-License-Identifier: Apache-2.0 |
| |
| #include "sw/device/examples/demos.h" |
| |
| #include <stdbool.h> |
| |
| #include "sw/device/lib/arch/device.h" |
| #include "sw/device/lib/dif/dif_gpio.h" |
| #include "sw/device/lib/dif/dif_spi_device.h" |
| #include "sw/device/lib/dif/dif_uart.h" |
| #include "sw/device/lib/runtime/hart.h" |
| #include "sw/device/lib/runtime/log.h" |
| #include "sw/device/lib/testing/test_framework/check.h" |
| |
| void demo_gpio_startup(dif_gpio_t *gpio) { |
| LOG_INFO("Watch the LEDs!"); |
| |
| // Give a LED pattern as startup indicator for 5 seconds. |
| CHECK_DIF_OK(dif_gpio_write_all(gpio, 0x00ff)); |
| for (int i = 0; i < 32; ++i) { |
| busy_spin_micros(5 * 1000); // 5 ms |
| CHECK_DIF_OK(dif_gpio_write(gpio, 8 + (i % 8), (i / 8) % 2)); |
| } |
| CHECK_DIF_OK(dif_gpio_write_all(gpio, 0x0000)); // All LEDs off. |
| } |
| |
| /** |
| * Mask for "valid" GPIO bits. The nibble at [11:8] represents switch inputs, |
| * while the bit at [22] represents the FTDI bit (SW strap 0). |
| */ |
| static const uint32_t kGpioMask = 0x400f00; |
| |
| /** |
| * Mask for the FTDI bit (SW strap 0) among the GPIO bits. |
| */ |
| static const uint32_t kFtdiMask = 0x400000; |
| |
| uint32_t demo_gpio_to_log_echo(dif_gpio_t *gpio, uint32_t prev_gpio_state) { |
| uint32_t gpio_state; |
| CHECK_DIF_OK(dif_gpio_read_all(gpio, &gpio_state)); |
| gpio_state &= kGpioMask; |
| |
| uint32_t state_delta = prev_gpio_state ^ gpio_state; |
| for (int bit_idx = 0; bit_idx < 8; ++bit_idx) { |
| bool changed = ((state_delta >> bit_idx) & 0x1) != 0; |
| bool is_currently_set = ((gpio_state >> bit_idx) & 0x1) != 0; |
| if (changed) { |
| LOG_INFO("GPIO switch #%d changed to %d", bit_idx, is_currently_set); |
| } |
| } |
| |
| if ((state_delta & kFtdiMask) != 0) { |
| if ((gpio_state & kFtdiMask) != 0) { |
| LOG_INFO("FTDI control changed. Enable JTAG."); |
| } else { |
| LOG_INFO("FTDI control changed. Enable JTAG."); |
| } |
| } |
| |
| return gpio_state; |
| } |
| |
| void demo_spi_to_log_echo(dif_spi_device_handle_t *spi) { |
| uint32_t spi_buf[8]; |
| size_t spi_len; |
| CHECK_DIF_OK(dif_spi_device_recv(spi, spi_buf, sizeof(spi_buf), &spi_len)); |
| if (spi_len > 0) { |
| uint32_t echo_word = spi_buf[0] ^ 0x01010101; |
| CHECK_DIF_OK(dif_spi_device_send(spi, &echo_word, sizeof(uint32_t), |
| /*bytes_sent=*/NULL)); |
| LOG_INFO("SPI: %!s", spi_len, spi_buf); |
| } |
| } |
| |
| void demo_uart_to_uart_and_gpio_echo(dif_uart_t *uart, dif_gpio_t *gpio) { |
| while (true) { |
| size_t chars_available; |
| if (dif_uart_rx_bytes_available(uart, &chars_available) != kDifOk || |
| chars_available == 0) { |
| break; |
| } |
| |
| uint8_t rcv_char; |
| CHECK_DIF_OK(dif_uart_bytes_receive(uart, 1, &rcv_char, NULL)); |
| CHECK_DIF_OK(dif_uart_byte_send_polled(uart, rcv_char)); |
| CHECK_DIF_OK(dif_gpio_write_all(gpio, rcv_char)); |
| } |
| } |