firmware: gain control

firmware/common/max2837.c

@@ -369,6 +369,57 @@ bool max2837_set_lpf_bandwidth(const uint32_t bandwidth_hz) {
 	}
 }
 
+bool max2837_set_lna_gain(const uint32_t gain_db) {
+	uint16_t val;
+	switch(gain_db){
+		case 40:
+			val = MAX2837_LNAgain_MAX;
+			break;
+		case 32:
+			val = MAX2837_LNAgain_M8;
+			break;
+		case 24:
+			val = MAX2837_LNAgain_M16;
+			break;
+		case 16:
+			val = MAX2837_LNAgain_M24;
+			break;
+		case 8:
+			val = MAX2837_LNAgain_M32;
+			break;
+		case 0:
+			val = MAX2837_LNAgain_M40;
+			break;
+		default:
+			return false;
+	}
+	set_MAX2837_LNAgain(val);
+	max2837_reg_commit(1);
+	return true;
+}
+
+bool max2837_set_vga_gain(const uint32_t gain_db) {
+	if( (gain_db & 0x1) || gain_db > 62)/* 0b11111*2 */
+		return false;
+		
+	set_MAX2837_VGA( 31-(gain_db >> 1) );
+	max2837_reg_commit(5);
+	return true;
+}
+
+bool max2837_set_txvga_gain(const uint32_t gain_db, const uint32_t plus16) {
+	uint16_t val = 31-gain_db;
+	if(gain_db > 31)/* 0b111111 mind the bit 6 weigth*/
+		return false;
+	
+	if(plus16)
+		val |=  0x20; /* +16db */
+	
+	set_MAX2837_TXVGA_GAIN(val);
+	max2837_reg_commit(29);
+	return true;
+}
+
 #ifdef TEST
 int main(int ac, char **av)
 {

firmware/common/max2837.h

@@ -45,7 +45,10 @@ extern void max2837_stop(void);
  * where order of register writes matters. */
 extern void max2837_set_frequency(uint32_t freq);
 bool max2837_set_lpf_bandwidth(const uint32_t bandwidth_hz);
-
+bool max2837_set_lna_gain(const uint32_t gain_db);
+bool max2837_set_vga_gain(const uint32_t gain_db);
+bool max2837_set_txvga_gain(const uint32_t gain_db, const uint32_t plus16);
+	
 extern void max2837_tx(void);
 extern void max2837_rx(void);
 

firmware/common/max2837_regs.def

@@ -56,7 +56,7 @@ __MREG__(MAX2837_LNAgain,1,4,3)
 #define MAX2837_LNAgain_M8  0b100
 #define MAX2837_LNAgain_M16 0b010
 #define MAX2837_LNAgain_M24 0b110
-#define MAX2837_LNAgain_M32 0b001
+#define MAX2837_LNAgain_M32 0b011
 #define MAX2837_LNAgain_M40 0b111
 __MREG__(MAX2837_iqerr_trim,1,9,5)
 // 0b00000 = +4.0 degree phase error

firmware/hackrf_usb/hackrf_usb.c

@@ -760,6 +760,47 @@ usb_request_status_t usb_vendor_request_read_partid_serialno(
 	return USB_REQUEST_STATUS_OK;
 }
 
+usb_request_status_t usb_vendor_request_set_lna_gain(
+	usb_endpoint_t* const endpoint,	const usb_transfer_stage_t stage)
+{
+	if( stage == USB_TRANSFER_STAGE_SETUP ) {
+			const uint8_t value = max2837_set_lna_gain(endpoint->setup.index);
+			endpoint->buffer[0] = value;
+			usb_endpoint_schedule(endpoint->in, &endpoint->buffer, 1);
+			usb_endpoint_schedule_ack(endpoint->out);
+			return USB_REQUEST_STATUS_OK;
+	}
+	return USB_REQUEST_STATUS_OK;
+}
+
+usb_request_status_t usb_vendor_request_set_vga_gain(
+	usb_endpoint_t* const endpoint,	const usb_transfer_stage_t stage)
+{
+	if( stage == USB_TRANSFER_STAGE_SETUP ) {
+			const uint8_t value = max2837_set_vga_gain(endpoint->setup.index);
+			endpoint->buffer[0] = value;
+			usb_endpoint_schedule(endpoint->in, &endpoint->buffer, 1);
+			usb_endpoint_schedule_ack(endpoint->out);
+			return USB_REQUEST_STATUS_OK;
+	}
+	return USB_REQUEST_STATUS_OK;
+}
+
+usb_request_status_t usb_vendor_request_set_txvga_gain(
+	usb_endpoint_t* const endpoint,	const usb_transfer_stage_t stage)
+{
+	if( stage == USB_TRANSFER_STAGE_SETUP ) {
+			const uint8_t value = max2837_set_txvga_gain(
+				endpoint->setup.index, endpoint->setup.value);
+			
+			endpoint->buffer[0] = value;
+			usb_endpoint_schedule(endpoint->in, &endpoint->buffer, 1);
+			usb_endpoint_schedule_ack(endpoint->out);
+			return USB_REQUEST_STATUS_OK;
+	}
+	return USB_REQUEST_STATUS_OK;
+}
+
 static const usb_request_handler_fn vendor_request_handler[] = {
 	NULL,
 	usb_vendor_request_set_transceiver_mode,
@@ -779,7 +820,10 @@ static const usb_request_handler_fn vendor_request_handler[] = {
 	usb_vendor_request_read_version_string,
 	usb_vendor_request_set_freq,
 	usb_vendor_request_set_amp_enable,
-	usb_vendor_request_read_partid_serialno
+	usb_vendor_request_read_partid_serialno,
+	usb_vendor_request_set_lna_gain,
+	usb_vendor_request_set_vga_gain,
+	usb_vendor_request_set_txvga_gain
 };
 
 static const uint32_t vendor_request_handler_count =