main: add LCD frame decoding
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66816abc9f
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main/main.c
185
main/main.c
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@ -6,8 +6,11 @@
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#include <sys/reent.h>
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#include "esp_log.h"
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#include "esp_mac.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "tinyusb.h"
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#include "tusb_cdc_acm.h"
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#include "tusb_dfu_rt.h"
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@ -41,6 +44,134 @@
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static const char *TAG = "main";
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/* the MCU sends 1 or 17 bytes frame the to LCD controller
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* the below described which bit corresponds to which segment
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* digit 1 is left most on the LCD, bit 7 is the most significant bit.
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*
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* byte 0:
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* - 0x80: initialize LCD controller (1 byte frame)
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* - 0xa0: set segments (17 bytes frame)
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*
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* byte 1:
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* - bit 7: no segment
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* - bit 6: no segment
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* - bit 5: battery low level
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* - bit 4: battery mid level
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* - bit 3: battery high level
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* - bit 2: OVER
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* - bit 1: USB
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* - bit 0: Bluetooth icon
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*
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* byte 2:
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* - bit 7: battery case
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* - bit 6: MAX
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* - bit 5: MIN
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* - bit 4: HOLD
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* - bit 3: digit 1, segment b and segment c
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* - bit 2: digit 2, segment f
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* - bit 1: digit 2, segment g
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* - bit 0: digit 2, segment e
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*
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* byte 3:
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* - bit 7: FAST
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* - bit 6: digit 2, segment a
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* - bit 5: digit 2, segment b
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* - bit 4: digit 2, segment c
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* - bit 3: digit 2, segment d
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* - bit 2: digit 3, segment f
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* - bit 1: digit 3, segment g
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* - bot 0: digit 3, segment e
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*
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* byte 4:
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* - bit 7: SLOW
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* - bit 6: digit 3, segment a
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* - bit 5: digit 3, segment b
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* - bit 4: digit 3, segment c
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* - bit 3: digit 3, segment d
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* - bit 2: no segment
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* - bit 1: no segment
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* - bit 0: digit 3, segment dp
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*
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* byte 5:
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* - bit 7: dBC
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* - bit 6: digit 4, segment f
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* - bit 5: digit 4, segment g
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* - bit 4: digit 4, segment e
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* - bit 3: dBA
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* - bit 2: digit 4, segment a
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* - bit 1: digit 4, segment b
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* - bit 0: digit 4, segment c
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*
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* byte 6:
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* - bit 7: digit 4, segment d
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*
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* all other bits can be set to any value
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*/
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// number of bytes in an LCD frame
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#define FRAME_SIZE (17U)
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/** which bit should be set to enable which segment in specific digits
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* @note 0 = byte 0 bit 0
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*/
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static const uint8_t digit_segments[4][8] = {
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{ // digit 1
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0, // a (segment does not exist)
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16 + 3, // b
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16 + 3, // c
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0, // d (segment does not exist)
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0, // e (segment does not exist)
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0, // f (segment does not exist)
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0, // g (segment does not exist)
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0, // dp (segment does not exist)
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},
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{ // digit 2
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24 + 6, // a
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24 + 5, // b
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24 + 4, // c
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24 + 3, // d
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16 + 0, // e
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16 + 2, // f
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16 + 1, // g
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0, // dp (segment does not exist)
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},
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{ // digit 3
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32 + 6, // a
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32 + 5, // b
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32 + 4, // c
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32 + 3, // d
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24 + 0, // e
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24 + 2, // f
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24 + 1, // g
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0, // dp (actually 24 + 0 but we don't use it)
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},
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{ // digit 4
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40 + 2, // a
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40 + 1, // b
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40 + 0, // c
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48 + 7, // d
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40 + 4, // e
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40 + 6, // f
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40 + 5, // g
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0, // dp (segment does not exist)
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},
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};
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/** the index corresponds to the digit to be displayed, the value represent the segments to be enabled
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* @note LSb = a, MSb = dp
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*/
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static const uint8_t number_segments[10] = {
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0x3f, // 0: a b c d e f
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0x06, // 1: b c
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0x5b, // 2: a b d e g
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0x4f, // 3: a b c d g
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0x66, // 4: b c f g
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0x6d, // 5: a c d f g
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0x7d, // 6: a c d e f g
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0x07, // 7: a b c
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0x7f, // 8: a b c d e f g
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0x6f, // 9; a c b d f g
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};
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/**
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* @brief USB string descriptor
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*/
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@ -49,11 +180,58 @@ static const char* usb_str_desc[USB_STRING_DESCRIPTOR_ARRAY_SIZE] = {
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CONFIG_TINYUSB_DESC_MANUFACTURER_STRING, // 1: Manufacturer
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CONFIG_TINYUSB_DESC_PRODUCT_STRING, // 2: Product
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CONFIG_TINYUSB_DESC_SERIAL_STRING, // 3: Serials, should use chip ID
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CONFIG_TINYUSB_DESC_CDC_STRING, // 4: CDC Interface
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"GM1532 measurements", // 4: CDC Interface
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"", // 5: MSC Interface
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"DFU (runtime mode)" // 6: DFU RT
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};
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static QueueHandle_t meas_queue; // queue for the measurement messages received
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#define MEAS_QUEUE_SIZE 4 // max number of control message received
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/* handle measurement received */
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static void meas_task(void *pvParameter)
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{
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spi_slave_transaction_t t;
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while (xQueueReceive(meas_queue, &t, portMAX_DELAY) == pdTRUE) {
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const uint8_t* rx_buffer = t.rx_buffer; // t.rx_buffer is type-less
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if (t.trans_len > 6 && 0xa0 == rx_buffer[0]) { // frame long enough for the LCD data
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// extract digit segments
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uint8_t segments[4] = {0}; // which digit segments are enabled
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for (uint8_t digit = 0; digit < LENGTH(segments); digit++) {
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segments[digit] = 0; // clear all segments
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for (uint8_t seg = 0; seg < 8; seg++) {
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if (rx_buffer[digit_segments[digit][seg] / 8] & (1 << (digit_segments[digit][seg] % 8))) {
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segments[digit] |= (1 << seg);
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}
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}
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}
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// figure out digit value
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uint8_t digits[4] = {0};
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for (uint8_t digit = 0; digit < LENGTH(digits); digit++) {
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for (uint8_t i = 0; i < LENGTH(number_segments); i++) {
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if (number_segments[i] == segments[digit]) {
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digits[digit] = i;
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}
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}
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}
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const uint16_t meas = digits[0] * 1000 + digits[1] * 100 + digits[2] * 10 + digits[3]; // in deci dBA
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if (meas < 1400) { // ignore all segments on out of range values
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printf("%u.%u dBA\n", meas / 10, meas % 10);
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}
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}
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}
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}
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// called after LCD frame (e.g. SPI transaction) is received
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static uint8_t timeout = 0;
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void post_trans_cb(spi_slave_transaction_t *t) {
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if (t) {
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ESP_ERROR_CHECK( xQueueSend(meas_queue, t, 512) != pdTRUE ); // send measurement to be displayed
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spi_slave_queue_trans(SPI2_HOST, t, portMAX_DELAY); // re-add transaction
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}
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timeout = 0; // reset timeout since we received data
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}
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void app_main(void)
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{
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// check DFU force
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@ -105,6 +283,11 @@ void app_main(void)
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ESP_ERROR_CHECK( tusb_dfu_rf_init() ); // configure DFU runtime (ensures we can use it)
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ESP_LOGI(TAG, "USB initialized");
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// task to decode and show the measurements
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meas_queue = xQueueCreate(MEAS_QUEUE_SIZE, sizeof(spi_slave_transaction_t));
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ESP_ERROR_CHECK( NULL == meas_queue );
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xTaskCreate(meas_task, "meas_task", 2048, NULL, 4, NULL);
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// configure SPI for GM1352 LCD data frame reading
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const spi_bus_config_t buscfg = { // SPI bus configuration
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.mosi_io_num = GPIO_MOSI,
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