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hardened the ADB Host to spurious transmissions a little bit

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This commit is contained in:
demik 2021-08-09 22:48:08 +02:00
parent 08dc7fdbc7
commit 1481d25f42
1 changed files with 27 additions and 3 deletions
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30
main/adb.c
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@ -31,6 +31,9 @@
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "driver/rmt.h"
#include "driver/periph_ctrl.h"
#include "soc/periph_defs.h"
#include "soc/rmt_reg.h"
#include "adb.h"
#include "led.h"
@ -46,6 +49,7 @@ extern TaskHandle_t t_click, t_qx, t_qy;
/* static defines */
static void adb_handle_button(bool action);
static void adb_rmt_reset(void);
static bool adb_rx_isone(rmt_item32_t cell);
static bool adb_rx_isstop(rmt_item32_t cell);
static bool adb_rx_iszero(rmt_item32_t cell);
@ -87,7 +91,7 @@ void adb_init(void) {
gpio_set_level(GPIO_ADB, 1);
adb_tx_reset();
/* avoir console flood when installing/uninstalling RMT driver */
/* avoid console flood when installing/uninstalling RMT driver */
esp_log_level_set("intr_alloc", ESP_LOG_INFO);
/* init RMT RX driver with default values for ADB */
@ -159,6 +163,22 @@ void adb_probe(void) {
xTaskNotify(t_yellow, LED_OFF, eSetValueWithOverwrite);
}
/*
* sometimes the RMT device get stuck with a full RX buffer. On the Quack Mouse adapter,
* it prevends reading from the ADB if the receive buffer has been filled
*
* Somewhat a hack, but resetting the module sometimes help.
*/
void adb_rmt_reset() {
periph_module_reset(PERIPH_RMT_MODULE);
rmt_config(&adb_rmt_rx);
xTaskNotify(t_red, LED_ONCE, eSetValueWithOverwrite);
gpio_set_level(GPIO_ADB, 1);
adb_tx_reset();
}
void adb_task_host(void *pvParameters) {
/* Classic Apple Mouse Protocol is 16 bits long */
uint16_t data;
@ -172,7 +192,7 @@ void adb_task_host(void *pvParameters) {
ESP_LOGI(TAG, "host started on core %d", xPortGetCoreID());
/* poll the mouse like a maniac. It will answer only if there is user input */
ESP_ERROR_CHECK(rmt_driver_install(RMT_RX_CHANNEL, 200, 0));
ESP_ERROR_CHECK(rmt_driver_install(RMT_RX_CHANNEL, 256, 0));
while (true) {
/* Should give us a polling rate between 80-90 Hz */
@ -269,6 +289,7 @@ static bool adb_rx_iszero(rmt_item32_t cell) {
}
static uint16_t IRAM_ATTR adb_rx_mouse() {
uint32_t rmt_status;
uint16_t data = 0;
RingbufHandle_t rb = NULL;
rmt_item32_t* items = NULL;
@ -279,6 +300,9 @@ static uint16_t IRAM_ATTR adb_rx_mouse() {
configASSERT(rb != NULL);
rmt_rx_start(RMT_RX_CHANNEL, true);
items = (rmt_item32_t*)xRingbufferReceive(rb, &rx_size, pdMS_TO_TICKS(8));
rmt_status = RMT.status_ch[RMT_RX_CHANNEL];
if (((rmt_status >> RMT_STATE_CH0_S) & RMT_STATE_CH0_V) == 4)
adb_rmt_reset();
rmt_rx_stop(RMT_RX_CHANNEL);
if (items == NULL)
@ -294,7 +318,7 @@ static uint16_t IRAM_ATTR adb_rx_mouse() {
switch (rx_size) {
case 0:
return 0;
/* RMT giving back a buffer with a rx_size of 0… */
case 4:
/* single glitch or service request (keyboard), timeout/ignore */
rmt_memory_rw_rst(RMT_RX_CHANNEL);