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https://github.com/Valeh2012/PersonalVotingMachine
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113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/*
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u8x8cb.c
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STM32L031
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PA13: Clock
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PA14: Data
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Both lines have a pullup resistor
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*/
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#include "stm32l031xx.h"
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#include "delay.h"
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#include "u8x8.h"
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uint8_t u8x8_gpio_and_delay_stm32l0(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
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{
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switch(msg)
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{
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case U8X8_MSG_GPIO_AND_DELAY_INIT:
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/* only support for software I2C*/
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RCC->IOPENR |= RCC_IOPENR_IOPAEN; /* Enable clock for GPIO Port A */
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__NOP();
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__NOP();
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GPIOA->MODER &= ~GPIO_MODER_MODE14; /* clear mode for PA10 */
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//GPIOA->MODER |= GPIO_MODER_MODE14_0; /* Output mode for PA10 */
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_14; /* no open drain for PA10 */
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GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED14; /* low speed for PA10 */
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD14; /* no pullup/pulldown for PA10 */
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//GPIOA->BSRR = GPIO_BSRR_BS_14; /* atomic set PA10 */
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GPIOA->MODER &= ~GPIO_MODER_MODE13; /* clear mode for PA9 */
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//GPIOA->MODER |= GPIO_MODER_MODE13_0; /* Output mode for PA9 */
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_13; /* no open drain for PA9 */
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GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED13; /* low speed for PA9 */
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD13; /* no pullup/pulldown for PA9 */
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//GPIOA->BSRR = GPIO_BSRR_BS_13; /* atomic set PA9 */
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break;
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case U8X8_MSG_DELAY_NANO:
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/* not required for SW I2C */
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break;
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case U8X8_MSG_DELAY_10MICRO:
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/* not used at the moment */
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break;
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case U8X8_MSG_DELAY_100NANO:
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/* not used at the moment */
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break;
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case U8X8_MSG_DELAY_MILLI:
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delay_micro_seconds(arg_int*1000UL);
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break;
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case U8X8_MSG_DELAY_I2C:
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/* arg_int is 1 or 4: 100KHz (5us) or 400KHz (1.25us) */
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delay_micro_seconds(arg_int<=2?5:1);
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break;
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case U8X8_MSG_GPIO_I2C_CLOCK:
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if ( arg_int == 0 )
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{
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GPIOA->MODER &= ~GPIO_MODER_MODE13; /* clear mode for PA10 */
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GPIOA->MODER |= GPIO_MODER_MODE13_0; /* Output mode for PA10 */
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GPIOA->BSRR = GPIO_BSRR_BR_3; /* atomic clr PA9 */
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}
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else
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{
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//GPIOA->BSRR = GPIO_BSRR_BS_13; /* atomic set PA9 */
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GPIOA->MODER &= ~GPIO_MODER_MODE13; /* clear mode for PA9: input mode */
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}
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break;
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case U8X8_MSG_GPIO_I2C_DATA:
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if ( arg_int == 0 )
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{
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GPIOA->MODER &= ~GPIO_MODER_MODE14; /* clear mode for PA10 */
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GPIOA->MODER |= GPIO_MODER_MODE14_0; /* Output mode for PA10 */
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GPIOA->BSRR = GPIO_BSRR_BR_14; /* atomic clr PA10 */
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}
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else
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{
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//GPIOA->BSRR = GPIO_BSRR_BS_14; /* atomic set PA10 */
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// input mode
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GPIOA->MODER &= ~GPIO_MODER_MODE14; /* clear mode for PA10: input mode */
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}
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break;
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/*
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case U8X8_MSG_GPIO_MENU_SELECT:
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u8x8_SetGPIOResult(u8x8, Chip_GPIO_GetPinState(LPC_GPIO, KEY_SELECT_PORT, KEY_SELECT_PIN));
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break;
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case U8X8_MSG_GPIO_MENU_NEXT:
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u8x8_SetGPIOResult(u8x8, Chip_GPIO_GetPinState(LPC_GPIO, KEY_NEXT_PORT, KEY_NEXT_PIN));
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break;
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case U8X8_MSG_GPIO_MENU_PREV:
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u8x8_SetGPIOResult(u8x8, Chip_GPIO_GetPinState(LPC_GPIO, KEY_PREV_PORT, KEY_PREV_PIN));
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break;
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case U8X8_MSG_GPIO_MENU_HOME:
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u8x8_SetGPIOResult(u8x8, Chip_GPIO_GetPinState(LPC_GPIO, KEY_HOME_PORT, KEY_HOME_PIN));
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break;
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*/
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default:
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u8x8_SetGPIOResult(u8x8, 1);
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break;
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}
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return 1;
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}
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