feat: add bf20a6 output Only Y format support (#557)

Author: WangYuxin-esp

README.md

@@ -25,7 +25,7 @@ This repository hosts ESP32 series Soc compatible driver for image sensors. Addi
 | GC0308  | 640 x 480      | color      | YUV/YCbCr422<br/>RAW Bayer<br/>RGB565                        | 1/6.5"   |
 | GC2145  | 1600 x 1200    | color      | YUV/YCbCr422<br/>RAW Bayer<br/>RGB565                        | 1/5"     |
 | BF3005  | 640 x 480      | color      | YUV/YCbCr422<br/>RAW Bayer<br/>RGB565                        | 1/4"     |
-| BF20A6  | 640 x 480      | color      | YUV/YCbCr422<br/>RAW Bayer                                   | 1/10"    |
+| BF20A6  | 640 x 480      | color      | YUV/YCbCr422<br/>RAW Bayer<br/>Only Y                        | 1/10"    |
 | SC101IOT| 1280 x 720     | color      | YUV/YCbCr422<br/>Raw RGB                                     | 1/4.2"   |
 | SC030IOT| 640 x 480      | color      | YUV/YCbCr422<br/>RAW Bayer                                   | 1/6.5"   |
 | SC031GS | 640 x 480      | monochrome | RAW MONO<br/>Grayscale                                       | 1/6"     |

sensors/bf20a6.c

@@ -161,6 +161,12 @@ static int set_pixformat(sensor_t *sensor, pixformat_t pixformat)
     case PIXFORMAT_RAW:
         set_reg_bits(sensor, 0x12, 0, 1, 0x1);
         break;
+    case PIXFORMAT_GRAYSCALE:
+        write_reg(sensor->slv_addr, 0x12, 0x23);
+        write_reg(sensor->slv_addr, 0x3a, 0x00);
+        write_reg(sensor->slv_addr, 0xe1, 0x92);
+        write_reg(sensor->slv_addr, 0xe3, 0x02);
+        break;
     default:
         ESP_LOGW(TAG, "set_pix unsupport format");
         ret = -1;

target/esp32/ll_cam.c

@@ -491,7 +491,7 @@ size_t IRAM_ATTR ll_cam_memcpy(cam_obj_t *cam, uint8_t *out, const uint8_t *in,
 esp_err_t ll_cam_set_sample_mode(cam_obj_t *cam, pixformat_t pix_format, uint32_t xclk_freq_hz, uint16_t sensor_pid)
 {
     if (pix_format == PIXFORMAT_GRAYSCALE) {
-        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID) {
+        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID || sensor_pid == BF20A6_PID) {
             if (xclk_freq_hz > 10000000) {
                 sampling_mode = SM_0A00_0B00;
                 dma_filter = ll_cam_dma_filter_yuyv_highspeed;

target/esp32s2/ll_cam.c

@@ -394,7 +394,7 @@ size_t IRAM_ATTR ll_cam_memcpy(cam_obj_t *cam, uint8_t *out, const uint8_t *in,
 esp_err_t ll_cam_set_sample_mode(cam_obj_t *cam, pixformat_t pix_format, uint32_t xclk_freq_hz, uint16_t sensor_pid)
 {
     if (pix_format == PIXFORMAT_GRAYSCALE) {
-        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID) {
+        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID || sensor_pid == BF20A6_PID) {
             cam->in_bytes_per_pixel = 1;       // camera sends Y8
         } else {
             cam->in_bytes_per_pixel = 2;       // camera sends YU/YV

target/esp32s3/ll_cam.c

@@ -493,7 +493,7 @@ size_t IRAM_ATTR ll_cam_memcpy(cam_obj_t *cam, uint8_t *out, const uint8_t *in,
 esp_err_t ll_cam_set_sample_mode(cam_obj_t *cam, pixformat_t pix_format, uint32_t xclk_freq_hz, uint16_t sensor_pid)
 {
     if (pix_format == PIXFORMAT_GRAYSCALE) {
-        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID) {
+        if (sensor_pid == OV3660_PID || sensor_pid == OV5640_PID || sensor_pid == NT99141_PID || sensor_pid == SC031GS_PID || sensor_pid == BF20A6_PID) {
             cam->in_bytes_per_pixel = 1;       // camera sends Y8
         } else {
             cam->in_bytes_per_pixel = 2;       // camera sends YU/YV