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First steps toward custom clocking

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Figuring out how to configure the clocks.
This commit is contained in:
finga 2021-10-18 16:39:20 +02:00
parent 56053c7f33
commit 73efd9348c
1 changed files with 90 additions and 11 deletions
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101
firmware/src/main.c
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@ -191,15 +191,20 @@ static const uint8_t m_si5351_regs_15to92_149to170[100][2] = {
{21, 0x80}, /* CLK5 Control: Not used ... clock powered down */
{22, 0x80}, /* CLK6 Control: Not used ... clock powered down */
{23, 0x80}, /* CLK7 Control: Not used ... clock powered down */
{24, 0x00}, /* Clock disable state 0..3 (low when disabled) */
{25, 0x00}, /* Clock disable state 4..7 (low when disabled) */
// PLL_A Setup (720MHz)
{26, 0x00},
{27, 0x05},
{28, 0x00},
{29, 0x0C},
{30, 0x66},
{31, 0x00},
{32, 0x00},
{33, 0x02},
// P1: 0x00C66 = 3174
// P2: 0x00002 = 2
// P3: 0x00005 = 5
{26, 0x00}, // D7 - D0: MSNA_P3 [15:8]
{27, 0x05}, // D7 - D0: MSNA_P3 [7:0]
{28, 0x00}, // D1 - D0: MSNA_P1 [17:16]
{29, 0x0C}, // D7 - D0: MSNA_P1 [15:8]
{30, 0x66}, // D7 - D0: MSNA_P1 [7:0]
{31, 0x00}, // D7 - D4: MSNA_P3 [19:16], D3 - D0: MSNA_P2 [19:16]
{32, 0x00}, // D7 - D0: MSNA_P2 [15:8]
{33, 0x02}, // D7 - D0: MSNA_P2 [7:0]
// PLL_B Setup (705MHz)
{34, 0x02},
{35, 0x71},
@ -237,6 +242,80 @@ static const uint8_t m_si5351_regs_15to92_149to170[100][2] = {
{64, 0x00},
{65, 0x00}};
static const uint8_t m_si5351_regs_custom[51][2] = {
// Init
{3, 0xFF},
{16, 0x4F}, /* CLK0 Control: 8mA drive, Multisynth 0 as CLK0 source, Clock
not inverted, Source = PLLA, Multisynth 0 in integer mode,
clock powered up */
{17, 0x4F}, /* CLK1 Control: 8mA drive, Multisynth 1 as CLK1 source, Clock
not inverted, Source = PLLA, Multisynth 1 in integer mode,
clock powered up */
{18, 0x6F}, /* CLK2 Control: 8mA drive, Multisynth 2 as CLK2 source, Clock
not inverted, Source = PLLB, Multisynth 2 in integer mode,
clock powered up */
{19, 0x80}, /* CLK3 Control: Not used ... clock powered down */
{20, 0x80}, /* CLK4 Control: Not used ... clock powered down */
{21, 0x80}, /* CLK5 Control: Not used ... clock powered down */
{22, 0x80}, /* CLK6 Control: Not used ... clock powered down */
{23, 0x80}, /* CLK7 Control: Not used ... clock powered down */
{24, 0x00}, /* Clock disable state 0..3 (low when disabled) */
{25, 0x00}, /* Clock disable state 4..7 (low when disabled) */
// PLL_A Setup (900MHz) (36 + 0/1)
// P1: 4096 => 0x01000
// P2: 0 => 0x00000
// P3: 1 => 0x00001
{26, 0x00}, // D7 - D0: MSNA_P3 [15:8]
{27, 0x01}, // D7 - D0: MSNA_P3 [7:0]
{28, 0x00}, // D1 - D0: MSNA_P1 [17:16]
{29, 0x10}, // D7 - D0: MSNA_P1 [15:8]
{30, 0x00}, // D7 - D0: MSNA_P1 [7:0]
{31, 0x00}, // D7 - D4: MSNA_P3 [19:16], D3 - D0: MSNA_P2 [19:16]
{32, 0x00}, // D7 - D0: MSNA_P2 [15:8]
{33, 0x00}, // D7 - D0: MSNA_P2 [7:0]
// PLL_B Setup (375MHz) (15 + 0/1)
/* // P1: 1408 => 0x00580 */
/* // P2: 0 => 0x00000 */
/* // P3: 1 => 0x00001 */
{34, 0x00}, // D7 - D0: MSNB_P3 [15:8] */
{35, 0x01}, // D7 - D0: MSNB_P3 [7:0] */
{36, 0x00}, // D1 - D0: MSNB_P1 [17:16] */
{37, 0x05}, // D7 - D0: MSNB_P1 [15:8] */
{38, 0x80}, // D7 - D0: MSNB_P1 [7:0] */
{39, 0x00}, // D7 - D4: MSNB_P3 [19:16], D3 - D0: MSNA_P2 [19:16] */
{40, 0x00}, // D7 - D0: MSNB_P2 [15:8] */
{41, 0x00}, // D7 - D0: MSNB_P2 [7:0] */
// Multisynth0 Setup (120MHz)
// P1: 1
// P2: 0
// P3: 1
{42, 0x00}, // D7 - D0: MS0_P3 [15:8]
{43, 0x01}, // D7 - D0: MS0_P3 [7:0]
{44, 0x00}, // D6 - D4: R0_DIV [2:0], D3 - D2: MS0_DIVBY4 [1:0], D1 -D0: MS0_P1 [17:16]
{45, 0x01}, // D7 - D0: MS0_P1 [15:8]
{46, 0x01}, // D7 - D0: MS0_P1 [7:0]
{47, 0x00}, // D7 - D4: MS0_P3 [19:16], D3 - D0: MS0_P2 [19:16]
{48, 0x00}, // D7 - D0: MS0_P2 [15:8]
{49, 0x00}, // D7 - D0: MS0_P2 [7:0]
// Multisynth1 Setup (12MHz)
{50, 0x00},
{51, 0x01},
{52, 0x00},
{53, 0x1C},
{54, 0x00},
{55, 0x00},
{56, 0x00},
{57, 0x00},
// Multisynth2 Setup (13.56MHz)
{58, 0x00},
{59, 0x01},
{60, 0x00},
{61, 0x18},
{62, 0x00},
{63, 0x00},
{64, 0x00},
{65, 0x00}};
static void spi_init(void) {
SPI_DDR |= (1 << SPI_SCK) | (1 << SPI_MOSI) | (1 << SPI_SS);
SPI_PORT |= (1 << SPI_SS);
@ -878,9 +957,9 @@ int main(void) {
(void) &twi_read_register;
(void) &twi_write_register;
for (uint16_t i = 0; i < sizeof(m_si5351_regs_15to92_149to170) / 2; i++)
twi_write_register(SI5351_ADDRESS, m_si5351_regs_15to92_149to170[i][0],
m_si5351_regs_15to92_149to170[i][1]);
for (uint16_t i = 0; i < sizeof(m_si5351_regs_custom) / 2; i++)
twi_write_register(SI5351_ADDRESS, m_si5351_regs_custom[i][0],
m_si5351_regs_custom[i][1]);
twi_write_register(SI5351_ADDRESS, SI5351_REGISTER_177_PLL_RESET, 0xAC);
twi_write_register(SI5351_ADDRESS, SI5351_REGISTER_3_OUTPUT_ENABLE_CONTROL, 0x00);