131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
// This is a woefully inadequate set of bindings for GPIO control, and
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// needs to be replaced with something much better.
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#include <stdio.h>
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#include <string.h>
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#include <stm32f4xx.h>
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#include <stm32f4xx_rcc.h>
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#include <stm32f4xx_syscfg.h>
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#include <stm32f4xx_gpio.h>
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#include <stm32f4xx_exti.h>
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#include <stm32f4xx_tim.h>
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#include <stm32f4xx_pwr.h>
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#include <stm32f4xx_rtc.h>
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#include <stm32f4xx_usart.h>
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#include <stm32f4xx_rng.h>
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#include <usbd_storage_msd.h>
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#include <stm_misc.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "misc.h"
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#include "parse.h"
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#include "obj.h"
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#include "compile.h"
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#include "runtime0.h"
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#include "runtime.h"
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#include "systick.h"
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#include "gpio.h"
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void parse_pin_name(mp_obj_t name, GPIO_TypeDef **port, uint *pin) {
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const char *pin_name = mp_obj_str_get_str(name);
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switch (pin_name[0]) {
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case 'A': case 'a': *port = GPIOA; break;
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case 'B': case 'b': *port = GPIOB; break;
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case 'C': case 'c': *port = GPIOC; break;
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case 'D': case 'd': *port = GPIOD; break;
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default: goto pin_error;
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}
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*pin = 0;
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for (const char *s = pin_name + 1; *s; s++) {
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if (!('0' <= *s && *s <= '9')) {
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goto pin_error;
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}
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*pin = 10 * (*pin) + *s - '0';
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}
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if (!(0 <= *pin && *pin <= 15)) {
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goto pin_error;
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}
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return;
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pin_error:
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nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin %s does not exist", pin_name));
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}
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mp_obj_t pyb_gpio(uint n_args, mp_obj_t *args) {
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//assert(1 <= n_args && n_args <= 2);
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GPIO_TypeDef *port;
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uint pin;
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parse_pin_name(args[0], &port, &pin);
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if (n_args == 1) {
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// get pin
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if ((port->IDR & (1 << pin)) != (uint32_t)Bit_RESET) {
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return MP_OBJ_NEW_SMALL_INT(1);
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} else {
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return MP_OBJ_NEW_SMALL_INT(0);
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}
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} else {
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// set pin
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if (rt_is_true(args[1])) {
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// set pin high
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port->BSRRL = 1 << pin;
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} else {
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// set pin low
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port->BSRRH = 1 << pin;
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}
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return mp_const_none;
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}
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_gpio_obj, 1, 2, pyb_gpio);
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mp_obj_t pyb_gpio_input(mp_obj_t arg_port_pin, mp_obj_t arg_mode) {
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GPIO_TypeDef *port;
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uint pin;
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parse_pin_name(arg_port_pin, &port, &pin);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = 1 << pin;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
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GPIO_InitStructure.GPIO_PuPd = mp_obj_get_int(arg_mode);
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GPIO_Init(port, &GPIO_InitStructure);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(pyb_gpio_input_obj, pyb_gpio_input);
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mp_obj_t pyb_gpio_output(mp_obj_t arg_port_pin, mp_obj_t arg_mode) {
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GPIO_TypeDef *port;
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uint pin;
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parse_pin_name(arg_port_pin, &port, &pin);
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = 1 << pin;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_Speed = GPIO_Fast_Speed;
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GPIO_InitStructure.GPIO_OType = mp_obj_get_int(arg_mode);
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(port, &GPIO_InitStructure);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(pyb_gpio_output_obj, pyb_gpio_output);
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void gpio_init(mp_obj_t mod) {
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rt_store_attr(mod, MP_QSTR_gpio, (mp_obj_t)&pyb_gpio_obj);
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rt_store_attr(mod, MP_QSTR_gpio_in, (mp_obj_t)&pyb_gpio_input_obj);
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rt_store_attr(mod, MP_QSTR_gpio_out, (mp_obj_t)&pyb_gpio_output_obj);
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rt_store_attr(mod, qstr_from_str("PULL_NONE"), MP_OBJ_NEW_SMALL_INT(GPIO_PuPd_NOPULL));
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rt_store_attr(mod, qstr_from_str("PULL_UP"), MP_OBJ_NEW_SMALL_INT(GPIO_PuPd_UP));
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rt_store_attr(mod, qstr_from_str("PULL_DOWN"), MP_OBJ_NEW_SMALL_INT(GPIO_PuPd_DOWN));
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rt_store_attr(mod, qstr_from_str("PUSH_PULL"), MP_OBJ_NEW_SMALL_INT(GPIO_OType_PP));
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rt_store_attr(mod, qstr_from_str("OPEN_DRAIN"), MP_OBJ_NEW_SMALL_INT(GPIO_OType_OD));
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}
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