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112 lines
3.3 KiB
112 lines
3.3 KiB
/* |
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u8x8cb.c |
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STM32L031 |
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PA9: Clock |
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PA10: 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_MODE10; /* clear mode for PA10 */ |
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//GPIOA->MODER |= GPIO_MODER_MODE10_0; /* Output mode for PA10 */ |
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_10; /* no open drain for PA10 */ |
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GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED10; /* low speed for PA10 */ |
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD10; /* no pullup/pulldown for PA10 */ |
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//GPIOA->BSRR = GPIO_BSRR_BS_10; /* atomic set PA10 */ |
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GPIOA->MODER &= ~GPIO_MODER_MODE9; /* clear mode for PA9 */ |
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//GPIOA->MODER |= GPIO_MODER_MODE9_0; /* Output mode for PA9 */ |
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_9; /* no open drain for PA9 */ |
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GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED9; /* low speed for PA9 */ |
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD9; /* no pullup/pulldown for PA9 */ |
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//GPIOA->BSRR = GPIO_BSRR_BS_9; /* 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_MODE9; /* clear mode for PA10 */ |
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GPIOA->MODER |= GPIO_MODER_MODE9_0; /* Output mode for PA10 */ |
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GPIOA->BSRR = GPIO_BSRR_BR_9; /* 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_9; /* atomic set PA9 */ |
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GPIOA->MODER &= ~GPIO_MODER_MODE9; /* 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_MODE10; /* clear mode for PA10 */ |
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GPIOA->MODER |= GPIO_MODER_MODE10_0; /* Output mode for PA10 */ |
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GPIOA->BSRR = GPIO_BSRR_BR_10; /* 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_10; /* atomic set PA10 */ |
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// input mode |
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GPIOA->MODER &= ~GPIO_MODER_MODE10; /* 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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