From 1613ad130bf86814f2540d258b31d5523e9b8f24 Mon Sep 17 00:00:00 2001 From: "(no author)" <(no author)@6dc7ffe9-61d6-0310-9af1-9938baff3ed1> Date: Sun, 10 Sep 2006 14:13:58 +0000 Subject: move PWM code to OS git-svn-id: https://svn.openpcd.org:2342/trunk@169 6dc7ffe9-61d6-0310-9af1-9938baff3ed1 --- openpcd/firmware/src/os/pwm.c | 165 +++++++++++++++++++++++++++++++++++++++++ openpcd/firmware/src/pcd/pwm.c | 165 ----------------------------------------- 2 files changed, 165 insertions(+), 165 deletions(-) create mode 100644 openpcd/firmware/src/os/pwm.c delete mode 100644 openpcd/firmware/src/pcd/pwm.c diff --git a/openpcd/firmware/src/os/pwm.c b/openpcd/firmware/src/os/pwm.c new file mode 100644 index 0000000..e05699b --- /dev/null +++ b/openpcd/firmware/src/os/pwm.c @@ -0,0 +1,165 @@ +/* AT91SAM7 PWM routines for OpenPCD / OpenPICC + * + * (C) 2006 by Harald Welte + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "../openpcd.h" + +#define Hz +#define kHz *1000 Hz +#define MHz *1000 kHz +#define MCLK (48 MHz) + +#if 1 +#define DEBUGPWM DEBUGPCRF +#else +#define DEBUGPWM(x, args...) +#endif + +static AT91PS_PWMC pwm = AT91C_BASE_PWMC; + +/* find highest bit set. returns bit (32..1) or 0 in case no bit set */ +static int fhs(u_int32_t val) +{ + int i; + + for (i = 32; i > 0; i--) { + if (val & (1 << (i-1))) + return i; + } + + return 0; +} + +/* set frequency of PWM signal to freq */ +int pwm_freq_set(int channel, u_int32_t freq) +{ + /* in order to get maximum resolution, the pre-scaler must be set to + * something like freq << 16. However, the mimimum pre-scaled frequency + * we can get is MCLK (48MHz), the minimum is MCLK/(1024*255) = + * 48MHz/261120 = 183Hz */ + u_int32_t overall_div; + u_int32_t presc_total; + u_int8_t cpre = 0; + u_int16_t cprd; + + if (freq > MCLK) + return -ERANGE; + + overall_div = MCLK / freq; + DEBUGPCRF("mclk=%u, freq=%u, overall_div=%u", MCLK, freq, overall_div); + + if (overall_div > 0x7fff) { + /* divisor is larger than half the maximum CPRD register, we + * have to configure prescalers */ + presc_total = overall_div >> 15; + + /* find highest 2^n fitting in prescaler (highest bit set) */ + cpre = fhs(presc_total); + if (cpre > 0) { + /* subtract one, because of fhs semantics */ + cpre--; + } + cprd = overall_div / (1 << cpre); + } else + cprd = overall_div; + + DEBUGPCRF("cpre=%u, cprd=%u", cpre, cprd); + AT91F_PWMC_CfgChannel(AT91C_BASE_PWMC, channel, + cpre|AT91C_PWMC_CPOL, cprd, 1); + + return 0; +} + +void pwm_start(int channel) +{ + AT91F_PWMC_StartChannel(AT91C_BASE_PWMC, (1 << channel)); +} + +void pwm_stop(int channel) +{ + AT91F_PWMC_StopChannel(AT91C_BASE_PWMC, (1 << channel)); +} + +void pwm_duty_set_percent(int channel, u_int16_t duty) +{ + u_int32_t tmp = pwm->PWMC_CH[channel].PWMC_CPRDR & 0xffff; + + tmp = tmp << 16; /* extend value by 2^16 */ + tmp = tmp / 100; /* tmp = 1 % of extended cprd */ + tmp = duty * tmp; /* tmp = 'duty' % of extended cprd */ + tmp = tmp >> 16; /* un-extend tmp (divide by 2^16) */ + + DEBUGPWM("Writing %u to Update register\n", tmp); + AT91F_PWMC_UpdateChannel(AT91C_BASE_PWMC, channel, tmp); +} + +static int pwm_usb_in(struct req_ctx *rctx) +{ + struct openpcd_hdr *poh = (struct openpcd_hdr *) &rctx->rx.data[0]; + /* struct openpcd_hdr *pih = (struct openpcd_hdr *) &rctx->tx.data[0]; */ + u_int32_t *freq; + + switch (poh->cmd) { + case OPENPCD_CMD_PWM_ENABLE: + if (poh->val) + pwm_start(0); + else + pwm_stop(0); + break; + case OPENPCD_CMD_PWM_DUTY_SET: + pwm_duty_set_percent(0, poh->val); + break; + case OPENPCD_CMD_PWM_DUTY_GET: + goto respond; + break; + case OPENPCD_CMD_PWM_FREQ_SET: + if (rctx->rx.tot_len < sizeof(*poh)+4) + break; + freq = (unsigned char *) poh + sizeof(*poh); + pwm_freq_set(0, *freq); + break; + case OPENPCD_CMD_PWM_FREQ_GET: + goto respond; + break; + default: + break; + } + + req_ctx_put(rctx); + return 0; +respond: + req_ctx_set_state(rctx, RCTX_STATE_UDP_EP2_PENDING); + udp_refill_ep(2, rctx); + return 1; +} + +void pwm_init(void) +{ + /* IMPORTANT: Disable PA17 (SSC TD) output */ + AT91F_PIO_CfgInput(AT91C_BASE_PIOA, AT91C_PIO_PA17); + + /* Set PA23 to Peripheral A (PWM0) */ + AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, OPENPCD_PIO_MFIN_PWM); + + /* Enable Clock for PWM controller */ + AT91F_PWMC_CfgPMC(); + + usb_hdlr_register(&pwm_usb_in, OPENPCD_CMD_CLS_PWM); +} + +void pwm_fini(void) +{ + usb_hdlr_unregister(OPENPCD_CMD_CLS_PWM); + AT91F_PMC_DisablePeriphClock(AT91C_BASE_PMC, (1 << AT91C_ID_PWMC)); +} diff --git a/openpcd/firmware/src/pcd/pwm.c b/openpcd/firmware/src/pcd/pwm.c deleted file mode 100644 index e05699b..0000000 --- a/openpcd/firmware/src/pcd/pwm.c +++ /dev/null @@ -1,165 +0,0 @@ -/* AT91SAM7 PWM routines for OpenPCD / OpenPICC - * - * (C) 2006 by Harald Welte - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "../openpcd.h" - -#define Hz -#define kHz *1000 Hz -#define MHz *1000 kHz -#define MCLK (48 MHz) - -#if 1 -#define DEBUGPWM DEBUGPCRF -#else -#define DEBUGPWM(x, args...) -#endif - -static AT91PS_PWMC pwm = AT91C_BASE_PWMC; - -/* find highest bit set. returns bit (32..1) or 0 in case no bit set */ -static int fhs(u_int32_t val) -{ - int i; - - for (i = 32; i > 0; i--) { - if (val & (1 << (i-1))) - return i; - } - - return 0; -} - -/* set frequency of PWM signal to freq */ -int pwm_freq_set(int channel, u_int32_t freq) -{ - /* in order to get maximum resolution, the pre-scaler must be set to - * something like freq << 16. However, the mimimum pre-scaled frequency - * we can get is MCLK (48MHz), the minimum is MCLK/(1024*255) = - * 48MHz/261120 = 183Hz */ - u_int32_t overall_div; - u_int32_t presc_total; - u_int8_t cpre = 0; - u_int16_t cprd; - - if (freq > MCLK) - return -ERANGE; - - overall_div = MCLK / freq; - DEBUGPCRF("mclk=%u, freq=%u, overall_div=%u", MCLK, freq, overall_div); - - if (overall_div > 0x7fff) { - /* divisor is larger than half the maximum CPRD register, we - * have to configure prescalers */ - presc_total = overall_div >> 15; - - /* find highest 2^n fitting in prescaler (highest bit set) */ - cpre = fhs(presc_total); - if (cpre > 0) { - /* subtract one, because of fhs semantics */ - cpre--; - } - cprd = overall_div / (1 << cpre); - } else - cprd = overall_div; - - DEBUGPCRF("cpre=%u, cprd=%u", cpre, cprd); - AT91F_PWMC_CfgChannel(AT91C_BASE_PWMC, channel, - cpre|AT91C_PWMC_CPOL, cprd, 1); - - return 0; -} - -void pwm_start(int channel) -{ - AT91F_PWMC_StartChannel(AT91C_BASE_PWMC, (1 << channel)); -} - -void pwm_stop(int channel) -{ - AT91F_PWMC_StopChannel(AT91C_BASE_PWMC, (1 << channel)); -} - -void pwm_duty_set_percent(int channel, u_int16_t duty) -{ - u_int32_t tmp = pwm->PWMC_CH[channel].PWMC_CPRDR & 0xffff; - - tmp = tmp << 16; /* extend value by 2^16 */ - tmp = tmp / 100; /* tmp = 1 % of extended cprd */ - tmp = duty * tmp; /* tmp = 'duty' % of extended cprd */ - tmp = tmp >> 16; /* un-extend tmp (divide by 2^16) */ - - DEBUGPWM("Writing %u to Update register\n", tmp); - AT91F_PWMC_UpdateChannel(AT91C_BASE_PWMC, channel, tmp); -} - -static int pwm_usb_in(struct req_ctx *rctx) -{ - struct openpcd_hdr *poh = (struct openpcd_hdr *) &rctx->rx.data[0]; - /* struct openpcd_hdr *pih = (struct openpcd_hdr *) &rctx->tx.data[0]; */ - u_int32_t *freq; - - switch (poh->cmd) { - case OPENPCD_CMD_PWM_ENABLE: - if (poh->val) - pwm_start(0); - else - pwm_stop(0); - break; - case OPENPCD_CMD_PWM_DUTY_SET: - pwm_duty_set_percent(0, poh->val); - break; - case OPENPCD_CMD_PWM_DUTY_GET: - goto respond; - break; - case OPENPCD_CMD_PWM_FREQ_SET: - if (rctx->rx.tot_len < sizeof(*poh)+4) - break; - freq = (unsigned char *) poh + sizeof(*poh); - pwm_freq_set(0, *freq); - break; - case OPENPCD_CMD_PWM_FREQ_GET: - goto respond; - break; - default: - break; - } - - req_ctx_put(rctx); - return 0; -respond: - req_ctx_set_state(rctx, RCTX_STATE_UDP_EP2_PENDING); - udp_refill_ep(2, rctx); - return 1; -} - -void pwm_init(void) -{ - /* IMPORTANT: Disable PA17 (SSC TD) output */ - AT91F_PIO_CfgInput(AT91C_BASE_PIOA, AT91C_PIO_PA17); - - /* Set PA23 to Peripheral A (PWM0) */ - AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, OPENPCD_PIO_MFIN_PWM); - - /* Enable Clock for PWM controller */ - AT91F_PWMC_CfgPMC(); - - usb_hdlr_register(&pwm_usb_in, OPENPCD_CMD_CLS_PWM); -} - -void pwm_fini(void) -{ - usb_hdlr_unregister(OPENPCD_CMD_CLS_PWM); - AT91F_PMC_DisablePeriphClock(AT91C_BASE_PMC, (1 << AT91C_ID_PWMC)); -} -- cgit v1.2.3