4 * This file is part of BeRTOS.
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14 * GNU General Public License for more details.
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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \brief STM32 GPIO control interface.
35 * \author Andrea Righi <arighi@develer.com>
38 #include <cfg/compiler.h>
39 #include <cfg/debug.h>
41 #include "gpio_stm32.h"
44 * Configure a GPIO pin
46 * \param base Base address of the GPIO port
47 * \param pins Bit-packed representation of the pin(s)
48 * \param mode Pin(s) configuration mode
49 * \param speed Output drive speed
51 * Return 0 on success, otherwise a negative value.
53 int stm32_gpioPinConfig(struct stm32_gpio *base,
54 uint16_t pins, uint8_t mode, uint8_t speed)
56 uint32_t reg_mode = mode & 0x0f;
64 uint32_t reg = base->CRL;
66 for (i = 0; i < 8; i++)
68 uint32_t pos = 1 << i;
73 reg &= ~(0x0f << pos);
74 reg |= reg_mode << pos;
76 if (mode == GPIO_MODE_IPD)
77 base->BRR = 0x01 << i;
78 if (mode == GPIO_MODE_IPU)
79 base->BSRR = 0x01 << i;
86 uint32_t reg = base->CRH;
88 for (i = 0; i < 8; i++)
90 uint32_t pos = 1 << (i + 8);
95 reg &= ~(0x0f << pos);
96 reg |= reg_mode << pos;
98 if (mode == GPIO_MODE_IPD)
99 base->BRR = 0x01 << (i + 8);
100 if (mode == GPIO_MODE_IPU)
101 base->BSRR = 0x01 << (i + 8);