feature: added machine.PWM class

raspberrypi/bcm283x_clockmgr.c

@@ -0,0 +1,23 @@
+#include <stdint.h>
+#include "bcm283x_clockmgr.h"
+
+void clockmgr_pause(clockmgr_t *clk) {
+    if (clk->CTL & CM_CTL_ENAB) {
+        clockmgr_set_ctl(clk, (clk->CTL & ~CM_CTL_ENAB));
+        while(clk->CTL & CM_CTL_BUSY) {};
+    }
+}
+
+void clockmgr_config_ctl(clockmgr_t *clk, int32_t flags) {
+    clockmgr_pause(clk);
+    clk->CTL = CM_PASSWORD | flags;
+}
+
+void clockmgr_config_div(clockmgr_t *clk, int32_t divi, int32_t divf) {
+    uint32_t save = clk->CTL;
+    clockmgr_pause(clk);
+    clockmgr_set_div(clk, divi, divf);
+    if (save & CM_CTL_ENAB) {
+        clockmgr_set_ctl(clk, save);
+    }
+}

raspberrypi/bcm283x_clockmgr.h

@@ -0,0 +1,53 @@
+#ifndef MICROPY_INCLUDED_RPI_BCM283X_CLOCKMGR_H
+#define MICROPY_INCLUDED_RPI_BCM283X_CLOCKMGR_H
+
+#define CM_GP0     (IO_BASE + 0x101070)
+#define CM_GP1     (IO_BASE + 0x101078)
+#define CM_GP2     (IO_BASE + 0x101080)
+#define CM_PCM     (IO_BASE + 0x101098)
+#define CM_PWM     (IO_BASE + 0x1010a0)
+
+typedef volatile struct _clockmgr_t {
+    uint32_t CTL;
+    uint32_t DIV;
+} clockmgr_t;
+
+
+#define CM_PASSWORD       (0x5a000000)
+
+#define CM_CTL_MASH_MASK  (3U<<9)
+#define CM_CTL_MASH_IDIV  (0U<<9)
+#define CM_CTL_MASH_1STG  (1U<<9)
+#define CM_CTL_MASH_2STG  (2U<<9)
+#define CM_CTL_MASH_3STG  (3U<<9)
+
+#define CM_CTL_FLIP       (1U<<8)
+#define CM_CTL_BUSY       (1U<<7)
+#define CM_CTL_KILL       (1U<<5)
+#define CM_CTL_ENAB       (1U<<4)
+
+#define CM_CTL_SRC_MASK   (0xfU)
+#define CM_CTL_SRC_GND    (0U)
+#define CM_CTL_SRC_OSC    (1U)
+#define CM_CTL_SRC_PLLA   (4U)
+#define CM_CTL_SRC_PLLC   (5U)
+#define CM_CTL_SRC_PLLD   (6U)
+#define CM_CTL_SRC_HDMI   (7U)
+
+#define CM_DIV_MASK       (0x00ffffffU)
+
+__attribute__(( always_inline )) inline void clockmgr_set_ctl(clockmgr_t *clk, uint32_t ctl) {
+    clk->CTL = CM_PASSWORD | (ctl & 0xffffff);
+}
+
+__attribute__(( always_inline )) inline void clockmgr_set_div(clockmgr_t *clk, uint32_t divi, uint32_t divf) {
+    clk->DIV = CM_PASSWORD | (divi & 0xfff) << 12 | (divf & 0xfff);
+}
+
+void clockmgr_pause(clockmgr_t *clk);
+
+void clockmgr_config_ctl(clockmgr_t *clk, int32_t flags);
+
+void clockmgr_config_div(clockmgr_t *clk, int32_t divi, int32_t divf);
+
+#endif // MICROPY_INCLUDED_RPI_BCM283X_CLOCKMGR_H

raspberrypi/bcm283x_pwm.h

@@ -0,0 +1,53 @@
+#ifndef MICROPY_INCLUDED_RPI_BCM283X_PWM_H
+#define MICROPY_INCLUDED_RPI_BCM283X_PWM_H
+
+#define PWM (IO_BASE + 0x20C000)
+
+typedef volatile struct _pwm_t {
+    uint32_t CTL;
+    uint32_t STA;
+    uint32_t DMAC;
+    uint32_t undef1;
+    uint32_t RNG1;
+    uint32_t DAT1;
+    uint32_t FIF1;
+    uint32_t undef2;
+    uint32_t RNG2;
+    uint32_t DAT2;
+} pwm_t;
+
+#define CTL_MSEN2 (1<<15)
+#define CTL_USEF2 (1<<13)
+#define CTL_POLA2 (1<<12)
+#define CTL_SBIT2 (1<<11)
+#define CTL_RPTL2 (1<<10)
+#define CTL_MODE2 (1<<9)
+#define CTL_PWEN2 (1<<8)
+#define CTL_MSEN1 (1<<7)
+#define CTL_CLRF1 (1<<6)
+#define CTL_USEF1 (1<<5)
+#define CTL_POLA1 (1<<4)
+#define CTL_SBIT1 (1<<3)
+#define CTL_RPTL1 (1<<2)
+#define CTL_MODE1 (1<<1)
+#define CTL_PWEN1 (1)
+
+#define STA_STA4  (1<<12)
+#define STA_STA3  (1<<11)
+#define STA_STA2  (1<<10)
+#define STA_STA1  (1<<9)
+#define STA_BERR  (1<<8)
+#define STA_GAPO4 (1<<7)
+#define STA_GAPO3 (1<<6)
+#define STA_GAPO2 (1<<5)
+#define STA_GAPO1 (1<<4)
+#define STA_RERR1 (1<<3)
+#define STA_WERR1 (1<<2)
+#define STA_EMPT1 (1<<1)
+#define STA_FULL1 (1)
+
+#define DMAC_ENAB  (1<<31)
+#define DMAC_PANIC (255<<8)
+#define DMAC_DREQ  (255)
+
+#endif // MICROPY_INCLUDED_RPI_BCM283X_PWM_H