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Correctly map TX gain from dB to register value.

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This commit is contained in:
Jared Boone 2016-08-03 16:12:01 -07:00
parent 69173f5292
commit 45a1ccbc53
2 changed files with 23 additions and 3 deletions
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16
firmware/application/max2837.cpp
View File

@ -55,6 +55,18 @@ static uint_fast8_t gain_ordinal(const int8_t db) {
} /* namespace vga */
namespace tx {
static uint_fast8_t gain_ordinal(const int8_t db) {
const auto db_sat = gain_db_range.clip(db);
uint8_t value = db_sat & 0x0f;
value = (db_sat >= 16) ? (value | 0x20) : value;
value = (db_sat >= 32) ? (value | 0x10) : value;
return (value & 0b111111) ^ 0b111111;
}
} /* namespace tx */
namespace filter {
static uint_fast8_t bandwidth_ordinal(const uint32_t bandwidth) {
@ -170,8 +182,8 @@ reg_t MAX2837::read(const Register reg) {
return read(toUType(reg));
}
void MAX2837::set_tx_vga_gain(const int_fast8_t value) {
_map.r.tx_gain.TXVGA_GAIN_SPI = value;
void MAX2837::set_tx_vga_gain(const int_fast8_t db) {
_map.r.tx_gain.TXVGA_GAIN_SPI = tx::gain_ordinal(db);
_dirty[Register::TX_GAIN] = 1;
flush();
}

10
firmware/application/max2837.hpp
View File

@ -83,6 +83,14 @@ constexpr int8_t gain_db_step = 2;
/*************************************************************************/
namespace tx {
constexpr range_t<int8_t> gain_db_range { 0, 47 };
constexpr int8_t gain_db_step = 1;
}
/*************************************************************************/
namespace filter {
constexpr std::array<uint32_t, 16> bandwidths {
@ -829,7 +837,7 @@ public:
void init();
void set_mode(const Mode mode);
void set_tx_vga_gain(const int_fast8_t value);
void set_tx_vga_gain(const int_fast8_t db);
void set_lna_gain(const int_fast8_t db);
void set_vga_gain(const int_fast8_t db);
void set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum);