diff options
Diffstat (limited to 'examples/baremetal/msp430f5529/nes-gamepads/gpio.c')
| -rw-r--r-- | examples/baremetal/msp430f5529/nes-gamepads/gpio.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/examples/baremetal/msp430f5529/nes-gamepads/gpio.c b/examples/baremetal/msp430f5529/nes-gamepads/gpio.c new file mode 100644 index 000000000..b5e58bc7c --- /dev/null +++ b/examples/baremetal/msp430f5529/nes-gamepads/gpio.c @@ -0,0 +1,167 @@ +/**************************************************************************** +** +** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com> +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of Qbs. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "hwdefs.h" +#include "gpio.h" + +enum { INVALID_ADDRESS = 0xFFFF }; + +static uint16_t gpio_port_address_get(enum gpio_port port) +{ + switch (port) { + case GPIO_PORT_P1: + return P1_BASE; + case GPIO_PORT_P2: + return P2_BASE; + case GPIO_PORT_P3: + return P3_BASE; + case GPIO_PORT_P4: + return P4_BASE; + case GPIO_PORT_P5: + return P5_BASE; + case GPIO_PORT_P6: + return P6_BASE; + case GPIO_PORT_P7: + return P7_BASE; + case GPIO_PORT_P8: + return P8_BASE; + case GPIO_PORT_PJ: + return PJ_BASE; + default: + break; + } + return INVALID_ADDRESS; +} + +static uint16_t gpio_pins_adjust(enum gpio_port port, uint16_t pins) +{ + if ((port & 1) ^ 1) + pins <<= 8; + return pins; +} + +void gpio_pins_set_as_out(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PASEL) &= ~pins; + HWREG16(base_address + OFS_PADIR) |= pins; +} + +void gpio_pins_set_as_in(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PASEL) &= ~pins; + HWREG16(base_address + OFS_PADIR) &= ~pins; + HWREG16(base_address + OFS_PAREN) &= ~pins; +} + +void gpio_pins_set_as_pf_out(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PADIR) |= pins; + HWREG16(base_address + OFS_PASEL) |= pins; +} + +void gpio_pins_set_as_pf_in(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PADIR) &= ~pins; + HWREG16(base_address + OFS_PASEL) |= pins; +} + +void gpio_pins_set_high(enum gpio_port port, + uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PAOUT) |= pins; +} + +void gpio_pins_set_low(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PAOUT) &= ~pins; +} + +void gpio_pins_toggle(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return; + pins = gpio_pins_adjust(port, pins); + HWREG16(base_address + OFS_PAOUT) ^= pins; +} + +enum gpio_pin_status gpio_pin_get(enum gpio_port port, uint16_t pins) +{ + const uint16_t base_address = gpio_port_address_get(port); + if (base_address == INVALID_ADDRESS) + return GPIO_INPUT_PIN_LOW; + pins = gpio_pins_adjust(port, pins); + const uint16_t value = HWREG16(base_address + OFS_PAIN) & pins; + return (value > 0) ? GPIO_INPUT_PIN_HIGH : GPIO_INPUT_PIN_LOW; +} |