77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
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#include "infinity_ergodox.h"
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#include "ch.h"
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#include "hal.h"
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#include "serial_link/system/serial_link.h"
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#include "lcd_backlight.h"
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void init_serial_link_hal(void) {
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PORTA->PCR[1] = PORTx_PCRn_PE | PORTx_PCRn_PS | PORTx_PCRn_PFE | PORTx_PCRn_MUX(2);
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PORTA->PCR[2] = PORTx_PCRn_DSE | PORTx_PCRn_SRE | PORTx_PCRn_MUX(2);
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PORTE->PCR[0] = PORTx_PCRn_PE | PORTx_PCRn_PS | PORTx_PCRn_PFE | PORTx_PCRn_MUX(3);
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PORTE->PCR[1] = PORTx_PCRn_DSE | PORTx_PCRn_SRE | PORTx_PCRn_MUX(3);
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}
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#define RED_PIN 1
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#define GREEN_PIN 2
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#define BLUE_PIN 3
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#define CHANNEL_RED FTM0->CHANNEL[0]
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#define CHANNEL_GREEN FTM0->CHANNEL[1]
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#define CHANNEL_BLUE FTM0->CHANNEL[2]
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#define RGB_PORT PORTC
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#define RGB_PORT_GPIO GPIOC
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// Base FTM clock selection (72 MHz system clock)
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// @ 0xFFFF period, 72 MHz / (0xFFFF * 2) = Actual period
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// Higher pre-scalar will use the most power (also look the best)
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// Pre-scalar calculations
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// 0 - 72 MHz -> 549 Hz
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// 1 - 36 MHz -> 275 Hz
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// 2 - 18 MHz -> 137 Hz
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// 3 - 9 MHz -> 69 Hz (Slightly visible flicker)
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// 4 - 4 500 kHz -> 34 Hz (Visible flickering)
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// 5 - 2 250 kHz -> 17 Hz
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// 6 - 1 125 kHz -> 9 Hz
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// 7 - 562 500 Hz -> 4 Hz
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// Using a higher pre-scalar without flicker is possible but FTM0_MOD will need to be reduced
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// Which will reduce the brightness range
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#define PRESCALAR_DEFINE 0
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void lcd_backlight_hal_init(void) {
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// Setup Backlight
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SIM->SCGC6 |= SIM_SCGC6_FTM0;
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FTM0->CNT = 0; // Reset counter
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// PWM Period
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// 16-bit maximum
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FTM0->MOD = 0xFFFF;
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// Set FTM to PWM output - Edge Aligned, Low-true pulses
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#define CNSC_MODE FTM_SC_CPWMS | FTM_SC_PS(4) | FTM_SC_CLKS(0)
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CHANNEL_RED.CnSC = CNSC_MODE;
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CHANNEL_GREEN.CnSC = CNSC_MODE;
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CHANNEL_BLUE.CnSC = CNSC_MODE;
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// System clock, /w prescalar setting
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FTM0->SC = FTM_SC_CLKS(1) | FTM_SC_PS(PRESCALAR_DEFINE);
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CHANNEL_RED.CnV = 0;
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CHANNEL_GREEN.CnV = 0;
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CHANNEL_BLUE.CnV = 0;
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RGB_PORT_GPIO->PDDR |= (1 << RED_PIN);
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RGB_PORT_GPIO->PDDR |= (1 << GREEN_PIN);
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RGB_PORT_GPIO->PDDR |= (1 << BLUE_PIN);
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#define RGB_MODE PORTx_PCRn_SRE | PORTx_PCRn_DSE | PORTx_PCRn_MUX(4)
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RGB_PORT->PCR[RED_PIN] = RGB_MODE;
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RGB_PORT->PCR[GREEN_PIN] = RGB_MODE;
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RGB_PORT->PCR[BLUE_PIN] = RGB_MODE;
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}
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void lcd_backlight_hal_color(uint16_t r, uint16_t g, uint16_t b) {
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CHANNEL_RED.CnV = r;
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CHANNEL_GREEN.CnV = g;
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CHANNEL_BLUE.CnV = b;
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}
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