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quack
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start of ADB stack: send reset command on startup

This commit is contained in:
demik 2021-03-21 22:01:43 +01:00
parent e242efe803
commit 4afacd14a4
3 changed files with 61 additions and 7 deletions
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BIN
EDA/Datasheet/ADB_Manager.pdf Normal file
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65
main/adb.c
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@ -33,9 +33,14 @@
#include "adb.h"
#include "gpio.h"
void adb_init(void) {
gpio_set_pull_mode(GPIO_ADB, GPIO_PULLUP_ONLY);
/* static defines */
static void adb_tx_async(void);
static void adb_tx_one(void);
static void adb_tx_zero(void);
/* functions */
void adb_init(void) {
/* If jumper is set, switch to ADB host mode */
if (gpio_get_level(GPIO_ADBSRC) == 0)
xTaskCreatePinnedToCore(&adb_task_host, "ADB_HOST", 6 * 1024, NULL, 4, NULL, 1);
@ -48,8 +53,10 @@ void adb_init(void) {
void adb_task_host(void *pvParameters) {
/* wait a little bit for H to set up, otherwise devices will not see the reset command */
gpio_set_level(GPIO_ADB, 1);
vTaskDelay(40 / portTICK_PERIOD_MS);
adb_send_reset();
vTaskDelay(20 / portTICK_PERIOD_MS);
adb_tx_reset();
adb_tx_cmd(ADB_MOUSE|ADB_TALK|ADB_REG0);
while (1) {
vTaskDelay(1000 / portTICK_PERIOD_MS);
@ -60,9 +67,57 @@ void adb_task_mouse(void *pvParameters) {
}
void adb_send_reset() {
static inline void adb_tx_async() {
/* send attention (800 µS low) + sync (70 µS high) */
gpio_set_level(GPIO_ADB, 0);
ets_delay_us(800);
gpio_set_level(GPIO_ADB, 1);
ets_delay_us(70);
}
void adb_tx_cmd(unsigned char cmd) {
adb_tx_async();
/* send actual byte (unrolled loop) */
cmd & 0x80 ? adb_tx_one() : adb_tx_zero();
cmd & 0x40 ? adb_tx_one() : adb_tx_zero();
cmd & 0x20 ? adb_tx_one() : adb_tx_zero();
cmd & 0x10 ? adb_tx_one() : adb_tx_zero();
cmd & 0x08 ? adb_tx_one() : adb_tx_zero();
cmd & 0x04 ? adb_tx_one() : adb_tx_zero();
cmd & 0x02 ? adb_tx_one() : adb_tx_zero();
cmd & 0x01 ? adb_tx_one() : adb_tx_zero();
/* stop bit */
adb_tx_zero();
gpio_set_direction(GPIO_ADB, GPIO_MODE_INPUT);
}
static inline void adb_tx_one() {
/* values from AN591 Datasheet minus the estimated call to ets_delay_us */
gpio_set_level(GPIO_ADB, 0);
ets_delay_us(30);
gpio_set_level(GPIO_ADB, 1);
ets_delay_us(60);
}
void adb_tx_reset() {
/*
* ADB spec says reset signal low for 3ms ±30%
* Note that the ADB Desktop Bus Mouse G5431 uses 4ms when plugged
*/
gpio_set_level(GPIO_ADB, 0);
ets_delay_us(3000);
gpio_set_level(GPIO_ADB, 1);
ets_delay_us(1000);
}
static inline void adb_tx_zero() {
/* values from AN591 Datasheet minus the estimated call to ets_delay_us */
gpio_set_level(GPIO_ADB, 0);
ets_delay_us(60);
gpio_set_level(GPIO_ADB, 1);
ets_delay_us(30);
}

3
main/gpio.c
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@ -54,7 +54,7 @@ void gpio_init(void) {
gpio_set_direction(GPIO_BTOFF, GPIO_MODE_INPUT);
/* ADB */
gpio_set_direction(GPIO_ADB, GPIO_MODE_INPUT|GPIO_MODE_OUTPUT);
gpio_set_direction(GPIO_ADB, GPIO_MODE_OUTPUT);
/* Quadrature mouse */
gpio_reset_pin(GPIO_CLICK);
@ -73,7 +73,6 @@ void gpio_init(void) {
gpio_set_direction(GPIO_QY1, GPIO_MODE_OUTPUT);
gpio_set_direction(GPIO_QY2, GPIO_MODE_OUTPUT);
gpio_set_level(GPIO_CLICK, 1);
}