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@@ -17,17 +17,46 @@
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#include "driver/i2c.h"
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#include "gpio_exp.h"
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+typedef struct gpio_exp_s {
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+ uint32_t first, last;
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+ union gpio_exp_phy_u phy;
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+ uint32_t shadow;
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+ TickType_t age;
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+ SemaphoreHandle_t mutex;
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+ uint32_t r_mask, w_mask;
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+ uint32_t pullup, pulldown;
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+ struct {
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+ gpio_exp_isr handler;
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+ void *arg;
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+ } isr[4];
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+ struct gpio_exp_model_s const *model;
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+} gpio_exp_t;
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+
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+typedef struct {
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+ enum { ASYNC_WRITE } type;
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+ int gpio;
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+ int level;
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+ gpio_exp_t *expander;
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+} async_request_t;
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+
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static const char TAG[] = "gpio expander";
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static void IRAM_ATTR intr_isr_handler(void* arg);
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-static struct gpio_exp_s* find_expander(struct gpio_exp_s *expander, int *gpio);
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+static gpio_exp_t* find_expander(gpio_exp_t *expander, int *gpio);
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-static void pca9535_set_direction(union gpio_exp_phy_u*, uint32_t, uint32_t);
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-static int pca9535_read(union gpio_exp_phy_u*);
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-static void pca9535_write(union gpio_exp_phy_u*, uint32_t, uint32_t);
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-static void pca85xx_set_direction(union gpio_exp_phy_u*, uint32_t, uint32_t);
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-static int pca85xx_read(union gpio_exp_phy_u*);
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-static void pca85xx_write(union gpio_exp_phy_u*, uint32_t, uint32_t);
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+static void pca9535_set_direction(gpio_exp_t* self);
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+static int pca9535_read(gpio_exp_t* self);
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+static void pca9535_write(gpio_exp_t* self);
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+
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+static void pca85xx_set_direction(gpio_exp_t* self);
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+static int pca85xx_read(gpio_exp_t* self);
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+static void pca85xx_write(gpio_exp_t* self);
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+
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+static void mcp23017_init(gpio_exp_t* self);
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+static void mcp23017_set_pull_mode(gpio_exp_t* self);
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+static void mcp23017_set_direction(gpio_exp_t* self);
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+static int mcp23017_read(gpio_exp_t* self);
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+static void mcp23017_write(gpio_exp_t* self);
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static void async_handler(void *arg);
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@@ -36,21 +65,14 @@ static uint8_t i2c_read_byte(uint8_t i2c_port, uint8_t i2c_addr, uint8_t reg);
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static uint16_t i2c_read_word(uint8_t i2c_port, uint8_t i2c_addr, uint8_t reg);
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static esp_err_t i2c_write_word(uint8_t i2c_port, uint8_t i2c_addr, uint8_t reg, uint16_t data);
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-typedef struct {
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- enum { ASYNC_WRITE } type;
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- int gpio;
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- int level;
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- struct gpio_exp_s *expander;
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-} async_request_t;
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-
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static const struct gpio_exp_model_s {
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char *model;
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gpio_int_type_t trigger;
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- void (*init)(union gpio_exp_phy_u*);
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- int (*read)(union gpio_exp_phy_u*);
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- void (*write)(union gpio_exp_phy_u*, uint32_t r_mask, uint32_t shadow);
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- void (*set_direction)(union gpio_exp_phy_u*, uint32_t r_mask, uint32_t w_mask);
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- void (*set_pull_mode)(int, gpio_pull_mode_t);
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+ void (*init)(gpio_exp_t* self);
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+ int (*read)(gpio_exp_t* self);
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+ void (*write)(gpio_exp_t* self);
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+ void (*set_direction)(gpio_exp_t* self);
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+ void (*set_pull_mode)(gpio_exp_t* self);
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} registered[] = {
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{ .model = "pca9535",
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.trigger = GPIO_INTR_NEGEDGE,
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@@ -61,37 +83,31 @@ static const struct gpio_exp_model_s {
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.trigger = GPIO_INTR_NEGEDGE,
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.set_direction = pca85xx_set_direction,
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.read = pca85xx_read,
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- .write = pca85xx_write, }
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+ .write = pca85xx_write, },
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+ { .model = "mcp23017",
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+ .trigger = GPIO_INTR_NEGEDGE,
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+ .init = mcp23017_init,
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+ .set_direction = mcp23017_set_direction,
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+ .set_pull_mode = mcp23017_set_pull_mode,
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+ .read = mcp23017_read,
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+ .write = mcp23017_write, },
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};
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static EXT_RAM_ATTR uint8_t n_expanders;
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static EXT_RAM_ATTR QueueHandle_t async_queue;
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-
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-static EXT_RAM_ATTR struct gpio_exp_s {
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- uint32_t first, last;
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- union gpio_exp_phy_u phy;
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- uint32_t shadow;
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- TickType_t age;
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- SemaphoreHandle_t mutex;
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- uint32_t r_mask, w_mask;
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- struct {
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- gpio_exp_isr handler;
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- void *arg;
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- } isr[4];
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- struct gpio_exp_model_s const *model;
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-} expanders[4];
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+static EXT_RAM_ATTR gpio_exp_t expanders[4];
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/******************************************************************************
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* Retrieve base from an expander reference
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*/
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-uint32_t gpio_exp_get_base(struct gpio_exp_s *expander) {
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+uint32_t gpio_exp_get_base(gpio_exp_t *expander) {
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return expander->first;
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}
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/******************************************************************************
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* Retrieve reference from a GPIO
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*/
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-struct gpio_exp_s *gpio_exp_get_expander(int gpio) {
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+gpio_exp_t *gpio_exp_get_expander(int gpio) {
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int _gpio = gpio;
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return find_expander(NULL, &_gpio);
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}
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@@ -99,10 +115,10 @@ struct gpio_exp_s *gpio_exp_get_expander(int gpio) {
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/******************************************************************************
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* Create an I2C expander
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*/
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-struct gpio_exp_s* gpio_exp_create(const gpio_exp_config_t *config) {
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- struct gpio_exp_s *expander = expanders + n_expanders;
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+gpio_exp_t* gpio_exp_create(const gpio_exp_config_t *config) {
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+ gpio_exp_t *expander = expanders + n_expanders;
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- if (config->base < GPIO_NUM_MAX || n_expanders == sizeof(expanders)/sizeof(struct gpio_exp_s)) {
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+ if (config->base < GPIO_NUM_MAX || n_expanders == sizeof(expanders)/sizeof(gpio_exp_t)) {
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ESP_LOGE(TAG, "Base %d GPIO must be at least %d for %s or too many expanders %d", config->base, GPIO_NUM_MAX, config->model, n_expanders);
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return NULL;
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}
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@@ -123,7 +139,7 @@ struct gpio_exp_s* gpio_exp_create(const gpio_exp_config_t *config) {
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expander->last = config->base + config->count - 1;
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expander->mutex = xSemaphoreCreateMutex();
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memcpy(&expander->phy, &config->phy, sizeof(union gpio_exp_phy_u));
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- if (expander->model->init) expander->model->init(&expander->phy);
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+ if (expander->model->init) expander->model->init(expander);
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// create a task to handle asynchronous requests (only write at this time)
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if (!async_queue) {
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@@ -166,7 +182,7 @@ struct gpio_exp_s* gpio_exp_create(const gpio_exp_config_t *config) {
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/******************************************************************************
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* Add ISR handler
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*/
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-bool gpio_exp_add_isr(gpio_exp_isr isr, void *arg, struct gpio_exp_s *expander) {
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+bool gpio_exp_add_isr(gpio_exp_isr isr, void *arg, gpio_exp_t *expander) {
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xSemaphoreTake(expander->mutex, pdMS_TO_TICKS(portMAX_DELAY));
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for (int i = 0; i < sizeof(expander->isr)/sizeof(*expander->isr); i++) {
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@@ -187,7 +203,7 @@ bool gpio_exp_add_isr(gpio_exp_isr isr, void *arg, struct gpio_exp_s *expander)
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/******************************************************************************
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* Set GPIO direction
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*/
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-esp_err_t gpio_exp_set_direction(int gpio, gpio_mode_t mode, struct gpio_exp_s *expander) {
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+esp_err_t gpio_exp_set_direction(int gpio, gpio_mode_t mode, gpio_exp_t *expander) {
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if ((expander = find_expander(expander, &gpio)) == NULL) return ESP_ERR_INVALID_ARG;
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xSemaphoreTake(expander->mutex, pdMS_TO_TICKS(portMAX_DELAY));
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@@ -206,7 +222,7 @@ esp_err_t gpio_exp_set_direction(int gpio, gpio_mode_t mode, struct gpio_exp_s *
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}
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// most expanders want unconfigured GPIO to be set to output
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- if (expander->model->set_direction) expander->model->set_direction(&expander->phy, expander->r_mask, expander->w_mask);
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+ if (expander->model->set_direction) expander->model->set_direction(expander);
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xSemaphoreGive(expander->mutex);
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return ESP_OK;
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@@ -215,7 +231,7 @@ esp_err_t gpio_exp_set_direction(int gpio, gpio_mode_t mode, struct gpio_exp_s *
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/******************************************************************************
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* Get GPIO level with cache
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*/
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-int gpio_exp_get_level(int gpio, uint32_t age, struct gpio_exp_s *expander) {
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+int gpio_exp_get_level(int gpio, uint32_t age, gpio_exp_t *expander) {
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if ((expander = find_expander(expander, &gpio)) == NULL) return -1;
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uint32_t now = xTaskGetTickCount();
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@@ -223,7 +239,7 @@ int gpio_exp_get_level(int gpio, uint32_t age, struct gpio_exp_s *expander) {
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if (now - expander->age >= pdMS_TO_TICKS(age)) {
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if (xSemaphoreTake(expander->mutex, pdMS_TO_TICKS(50)) == pdFALSE) return -1;
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- expander->shadow = expander->model->read(&expander->phy);
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+ expander->shadow = expander->model->read(expander);
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expander->age = now;
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xSemaphoreGive(expander->mutex);
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@@ -237,7 +253,7 @@ int gpio_exp_get_level(int gpio, uint32_t age, struct gpio_exp_s *expander) {
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/******************************************************************************
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* Set GPIO level with cache
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*/
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-esp_err_t gpio_exp_set_level(int gpio, int level, bool direct, struct gpio_exp_s *expander) {
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+esp_err_t gpio_exp_set_level(int gpio, int level, bool direct, gpio_exp_t *expander) {
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if ((expander = find_expander(expander, &gpio)) == NULL) return ESP_ERR_INVALID_ARG;
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uint32_t mask = 1 << gpio;
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@@ -256,7 +272,7 @@ esp_err_t gpio_exp_set_level(int gpio, int level, bool direct, struct gpio_exp_s
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// only write if shadow not up to date
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if ((mask ^ level) && expander->model->write) {
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expander->shadow = (expander->shadow & ~(mask | level)) | level;
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- expander->model->write(&expander->phy, expander->r_mask, expander->shadow);
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+ expander->model->write(expander);
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}
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xSemaphoreGive(expander->mutex);
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@@ -272,9 +288,16 @@ esp_err_t gpio_exp_set_level(int gpio, int level, bool direct, struct gpio_exp_s
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/******************************************************************************
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* Set GPIO pullmode
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*/
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-esp_err_t gpio_exp_set_pull_mode(int gpio, gpio_pull_mode_t mode, struct gpio_exp_s *expander) {
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+esp_err_t gpio_exp_set_pull_mode(int gpio, gpio_pull_mode_t mode, gpio_exp_t *expander) {
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if ((expander = find_expander(expander, &gpio)) != NULL && expander->model->set_pull_mode) {
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- expander->model->set_pull_mode(gpio, mode);
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+
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+ expander->pullup &= ~(1 << gpio);
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+ expander->pulldown &= ~(1 << gpio);
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+
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+ if (mode == GPIO_PULLUP_ONLY || mode == GPIO_PULLUP_PULLDOWN) expander->pullup |= 1 << gpio;
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+ if (mode == GPIO_PULLDOWN_ONLY || mode == GPIO_PULLUP_PULLDOWN) expander->pulldown |= 1 << gpio;
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+
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+ expander->model->set_pull_mode(expander);
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return ESP_OK;
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}
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return ESP_ERR_INVALID_ARG;
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@@ -283,8 +306,8 @@ esp_err_t gpio_exp_set_pull_mode(int gpio, gpio_pull_mode_t mode, struct gpio_ex
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/******************************************************************************
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* Enumerate modified GPIO
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*/
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-void gpio_exp_enumerate(gpio_exp_enumerator enumerator, struct gpio_exp_s *expander) {
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- uint32_t value = expander->model->read(&expander->phy) ^ expander->shadow;
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+void gpio_exp_enumerate(gpio_exp_enumerator enumerator, gpio_exp_t *expander) {
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+ uint32_t value = expander->model->read(expander) ^ expander->shadow;
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uint8_t clz;
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// memorize newly read value and just update if requested
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@@ -327,7 +350,7 @@ esp_err_t gpio_set_level_u(int gpio, int level) {
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/****************************************************************************************
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* Find the expander related to base
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*/
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-static struct gpio_exp_s* find_expander(struct gpio_exp_s *expander, int *gpio) {
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+static gpio_exp_t* find_expander(gpio_exp_t *expander, int *gpio) {
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for (int i = 0; !expander && i < n_expanders; i++) {
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if (*gpio >= expanders[i].first && *gpio <= expanders[i].last) expander = expanders + i;
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}
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@@ -341,33 +364,68 @@ static struct gpio_exp_s* find_expander(struct gpio_exp_s *expander, int *gpio)
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/****************************************************************************************
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* PCA9535 family : direction, read and write
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*/
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-static void pca9535_set_direction(union gpio_exp_phy_u *phy, uint32_t r_mask, uint32_t w_mask) {
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- i2c_write_word(phy->port, phy->addr, 0x06, r_mask);
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+static void pca9535_set_direction(gpio_exp_t* self) {
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x06, self->r_mask);
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}
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-static int pca9535_read(union gpio_exp_phy_u *phy) {
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- return i2c_read_word(phy->port, phy->addr, 0x00);
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+static int pca9535_read(gpio_exp_t* self) {
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+ return i2c_read_word(self->phy.port, self->phy.addr, 0x00);
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}
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-static void pca9535_write(union gpio_exp_phy_u *phy, uint32_t r_mask, uint32_t shadow) {
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- i2c_write_word(phy->port, phy->addr, 0x02, shadow);
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+static void pca9535_write(gpio_exp_t* self) {
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x02, self->shadow);
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}
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/****************************************************************************************
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* PCA85xx family : read and write
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*/
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-static void pca85xx_set_direction(union gpio_exp_phy_u *phy, uint32_t r_mask, uint32_t w_mask) {
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+static void pca85xx_set_direction(gpio_exp_t* self) {
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// all inputs must be set to 1 (open drain) and output are left open as well
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- i2c_write_word(phy->port, phy->addr, 0xff, r_mask | w_mask);
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+ i2c_write_word(self->phy.port, self->phy.addr, 0xff, self->r_mask | self->w_mask);
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}
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-static int pca85xx_read(union gpio_exp_phy_u *phy) {
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- return i2c_read_word(phy->port, phy->addr, 0xff);
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+static int pca85xx_read(gpio_exp_t* self) {
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+ return i2c_read_word(self->phy.port, self->phy.addr, 0xff);
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}
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-static void pca85xx_write(union gpio_exp_phy_u *phy, uint32_t r_mask, uint32_t shadow) {
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+static void pca85xx_write(gpio_exp_t* self) {
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// all input must be set to 1 (open drain)
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- i2c_write_word(phy->port, phy->addr, 0xff, shadow | r_mask);
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+ i2c_write_word(self->phy.port, self->phy.addr, 0xff, self->shadow | self->r_mask);
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+}
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+
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+/****************************************************************************************
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+ * MCP23017 family : init, direction, read and write
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+ */
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+static void mcp23017_init(gpio_exp_t* self) {
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+ /*
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+ 0111 x10x = same bank, mirrot single int, no sequentµial, open drain, active low
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+ not sure about this funny change of mapping of the control register itself, really?
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+ */
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+ i2c_write_byte(self->phy.port, self->phy.addr, 0x05, 0x74);
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+ i2c_write_byte(self->phy.port, self->phy.addr, 0x0a, 0x74);
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+
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+ // no interrupt on comparison or on change
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x04, 0x00);
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x08, 0x00);
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+}
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+
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+static void mcp23017_set_direction(gpio_exp_t* self) {
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+ // default to input and set real input to generate interrupt
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x00, ~self->w_mask);
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x04, self->r_mask);
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+}
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+
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+static void mcp23017_set_pull_mode(gpio_exp_t* self) {
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x0c, self->pullup);
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+}
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+
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+static int mcp23017_read(gpio_exp_t* self) {
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+ // read the pin value, not the stored one @interrupt
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+ return i2c_read_word(self->phy.port, self->phy.addr, 0x12);
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+}
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+
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+static void mcp23017_write(gpio_exp_t* self) {
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+ i2c_write_word(self->phy.port, self->phy.addr, 0x12, self->shadow);
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}
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/****************************************************************************************
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@@ -375,7 +433,7 @@ static void pca85xx_write(union gpio_exp_phy_u *phy, uint32_t r_mask, uint32_t s
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*/
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static void IRAM_ATTR intr_isr_handler(void* arg)
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{
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- struct gpio_exp_s *expander = (struct gpio_exp_s*) arg;
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+ gpio_exp_t *expander = (gpio_exp_t*) arg;
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BaseType_t woken = pdFALSE;
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for (int i = 0; i < sizeof(expander->isr)/sizeof(*expander->isr); i++) {
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