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targets/hal/TARGET_Atmel/TARGET_SAM_CortexM4/pwmout_api.c@107:414e9c822e99, 2016-04-05 (annotated)
- Committer:
- mbed_official
- Date:
- Tue Apr 05 18:15:12 2016 +0100
- Revision:
- 107:414e9c822e99
Synchronized with git revision dd3c5f7fa8473776950ec6e15c0e4adedb21cf2f
Full URL: https://github.com/mbedmicro/mbed/commit/dd3c5f7fa8473776950ec6e15c0e4adedb21cf2f/
* * Base Commit for SAMG55J19. No errors and no implementations.
* * Added gpio files.
* * Added pinmap files.
* * Base commit for usticker implementation.
* * Added gcc_arm export functionality
* * added files for usticker.
* added template file for samd55j19
* * GPIO IRQ base commit.
* * updated with changes in gpio irq driver.
* * Reverted back unexpected commit in SAM0 gpio driver.
* * updated gpio_irq driver.
* * correction in gpio and gpio_irq drivers.
* added support for some test for gpio.
* * base commit for peripheralpins for usart.
* update in serial apis.
* * updated serial apis.
* * updated serial apis and test.
* * update serial apis for asynch apis.
* * updated peripheral pins for i2c and spi.
* added test support for serial flow control
* * Base commit for low power ticker implementation.
* * base commit for port apis.
* update in lp ticker apis.
* * Added test support for port.
* * base commit for sleep apis.
* * Base commit for spi.
* * updated with corrections in gpio irq.
* usticker file updated with latest source.
* * updated with corrections for unexpected board reset.
* updated gpio irq apis and added test for the same.
* * updated sleep api for deepsleep.
* * updated serial apis.
* Added uc_ticker and SPI api implementations
* Removed unused SPI pin map
* Updated review feedback
* * implemented lpticker with TC module.
* updated files for KnR Coding Statndard.
* updated serial and usticker apis.
* * Base commit for AnalogueIn apis.
* * RTC apis base commit without implementation.
* * Updated with corrections in lpticker implementations.
* * Added implementation for rtc apis.
* * updated with implementations for pwm.
* changed usticker from TC0 to TC1.
* Added I2C support
* * removed setvector usage from usticker and lpticker implementations
* added tests for SAMG55J19
* * Removed unwanted .o and .d files.
* Updated I2C files for KnR Coding Standards.
* Update for reducing compiler warnings in peripheralpins,c
* Updated with PWM free implementation.
* * Removed unwanted headers file inclusion.
* Compiler warning corrections in serial_api.c
* * Updated ADC with 16 bit mode initialization and code refinements.
* Updated PWM with code refinements.
* Updated I2C review feedback and fixed style
* Updated target name for SAMG55
* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter
* * Added Test Support for I2C with AT30TSE75X and Added Support for SAMG55J19 in atmelstudio project exporter
* Used NVIC_SetVector for interrupt callback
* Removed Target macro define in test
* Updated test cases to have SAMG55 support
* * Updated with corrections in Serial and SPI asynchronous implementations.
* Updated deepsleep api implementation
* Merged LP_Ticker with latest code from mbed 3.0 repository.
* * updated with corrections in I2C Asynch implementation.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 107:414e9c822e99 | 1 | /* mbed Microcontroller Library |
mbed_official | 107:414e9c822e99 | 2 | * Copyright (c) 2006-2015 ARM Limited |
mbed_official | 107:414e9c822e99 | 3 | * |
mbed_official | 107:414e9c822e99 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 107:414e9c822e99 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 107:414e9c822e99 | 6 | * You may obtain a copy of the License at |
mbed_official | 107:414e9c822e99 | 7 | * |
mbed_official | 107:414e9c822e99 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 107:414e9c822e99 | 9 | * |
mbed_official | 107:414e9c822e99 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 107:414e9c822e99 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 107:414e9c822e99 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 107:414e9c822e99 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 107:414e9c822e99 | 14 | * limitations under the License. |
mbed_official | 107:414e9c822e99 | 15 | */ |
mbed_official | 107:414e9c822e99 | 16 | #include "mbed_assert.h" |
mbed_official | 107:414e9c822e99 | 17 | #include "pwmout_api.h" |
mbed_official | 107:414e9c822e99 | 18 | |
mbed_official | 107:414e9c822e99 | 19 | #include "cmsis.h" |
mbed_official | 107:414e9c822e99 | 20 | #include "tc.h" |
mbed_official | 107:414e9c822e99 | 21 | #include "sysclk.h" |
mbed_official | 107:414e9c822e99 | 22 | #include "PeripheralPins.h" |
mbed_official | 107:414e9c822e99 | 23 | |
mbed_official | 107:414e9c822e99 | 24 | extern uint8_t g_sys_init; |
mbed_official | 107:414e9c822e99 | 25 | |
mbed_official | 107:414e9c822e99 | 26 | /** Use TC Peripheral 0 **/ |
mbed_official | 107:414e9c822e99 | 27 | #define TC TC0 |
mbed_official | 107:414e9c822e99 | 28 | |
mbed_official | 107:414e9c822e99 | 29 | static const uint32_t tc_prescalar[] = { |
mbed_official | 107:414e9c822e99 | 30 | TC_CMR_TCCLKS_TIMER_CLOCK1, // MCK/2 |
mbed_official | 107:414e9c822e99 | 31 | TC_CMR_TCCLKS_TIMER_CLOCK2, // MCK/8 |
mbed_official | 107:414e9c822e99 | 32 | TC_CMR_TCCLKS_TIMER_CLOCK3, // MCK/32 |
mbed_official | 107:414e9c822e99 | 33 | TC_CMR_TCCLKS_TIMER_CLOCK4, // MCK/128 |
mbed_official | 107:414e9c822e99 | 34 | }; |
mbed_official | 107:414e9c822e99 | 35 | static const uint32_t tc_prescalar_divider[] = { |
mbed_official | 107:414e9c822e99 | 36 | 2, // MCK/2 |
mbed_official | 107:414e9c822e99 | 37 | 8, // MCK/8 |
mbed_official | 107:414e9c822e99 | 38 | 32, // MCK/32 |
mbed_official | 107:414e9c822e99 | 39 | 128 // MCK/128 |
mbed_official | 107:414e9c822e99 | 40 | }; |
mbed_official | 107:414e9c822e99 | 41 | |
mbed_official | 107:414e9c822e99 | 42 | uint32_t getpwmchannelid (uint32_t channel) |
mbed_official | 107:414e9c822e99 | 43 | { |
mbed_official | 107:414e9c822e99 | 44 | switch (channel) { |
mbed_official | 107:414e9c822e99 | 45 | case 0 : |
mbed_official | 107:414e9c822e99 | 46 | return ID_TC0; |
mbed_official | 107:414e9c822e99 | 47 | case 1 : |
mbed_official | 107:414e9c822e99 | 48 | return ID_TC1; |
mbed_official | 107:414e9c822e99 | 49 | case 2 : |
mbed_official | 107:414e9c822e99 | 50 | return ID_TC2; |
mbed_official | 107:414e9c822e99 | 51 | default : |
mbed_official | 107:414e9c822e99 | 52 | MBED_ASSERT(false); |
mbed_official | 107:414e9c822e99 | 53 | break; |
mbed_official | 107:414e9c822e99 | 54 | } |
mbed_official | 107:414e9c822e99 | 55 | } |
mbed_official | 107:414e9c822e99 | 56 | |
mbed_official | 107:414e9c822e99 | 57 | uint32_t getprescalarindex (uint16_t frequency) |
mbed_official | 107:414e9c822e99 | 58 | { |
mbed_official | 107:414e9c822e99 | 59 | float time_period_ms; |
mbed_official | 107:414e9c822e99 | 60 | time_period_ms = (1.0 / (float)frequency) * 1000.0; |
mbed_official | 107:414e9c822e99 | 61 | if (time_period_ms <= 1.0) { |
mbed_official | 107:414e9c822e99 | 62 | return 0; |
mbed_official | 107:414e9c822e99 | 63 | } else if ((time_period_ms > 1.0) && (time_period_ms <= 4.0)) { |
mbed_official | 107:414e9c822e99 | 64 | return 1; |
mbed_official | 107:414e9c822e99 | 65 | } else if ((time_period_ms > 4.0) && (time_period_ms <= 16.0)) { |
mbed_official | 107:414e9c822e99 | 66 | return 2; |
mbed_official | 107:414e9c822e99 | 67 | } else { |
mbed_official | 107:414e9c822e99 | 68 | return 3; |
mbed_official | 107:414e9c822e99 | 69 | } |
mbed_official | 107:414e9c822e99 | 70 | } |
mbed_official | 107:414e9c822e99 | 71 | |
mbed_official | 107:414e9c822e99 | 72 | static void setregisterabc (pwmout_t* obj) |
mbed_official | 107:414e9c822e99 | 73 | { |
mbed_official | 107:414e9c822e99 | 74 | uint32_t ra, rb, rc; |
mbed_official | 107:414e9c822e99 | 75 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 76 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 77 | |
mbed_official | 107:414e9c822e99 | 78 | /* Configure waveform frequency and duty cycle. */ |
mbed_official | 107:414e9c822e99 | 79 | rc = (sysclk_get_peripheral_bus_hz(TC) / |
mbed_official | 107:414e9c822e99 | 80 | tc_prescalar_divider[obj->prescalarindex] )/ |
mbed_official | 107:414e9c822e99 | 81 | obj->waveconfig.us_frequency; |
mbed_official | 107:414e9c822e99 | 82 | tc_write_rc(TC, obj->channel, rc); |
mbed_official | 107:414e9c822e99 | 83 | switch (obj->ioline) { |
mbed_official | 107:414e9c822e99 | 84 | case 0 : |
mbed_official | 107:414e9c822e99 | 85 | ra = (100 - obj->waveconfig.us_dutycycle) * rc / 100; |
mbed_official | 107:414e9c822e99 | 86 | if(ra <= 0) ra = 1; /*non zero value only*/ |
mbed_official | 107:414e9c822e99 | 87 | tc_write_ra(TC, obj->channel, ra); |
mbed_official | 107:414e9c822e99 | 88 | break; |
mbed_official | 107:414e9c822e99 | 89 | case 1 : |
mbed_official | 107:414e9c822e99 | 90 | rb = (100 - obj->waveconfig.us_dutycycle) * rc / 100; |
mbed_official | 107:414e9c822e99 | 91 | if(rb <= 0) rb = 1; /*non zero value only*/ |
mbed_official | 107:414e9c822e99 | 92 | tc_write_rb(TC, obj->channel, rb); |
mbed_official | 107:414e9c822e99 | 93 | break; |
mbed_official | 107:414e9c822e99 | 94 | default : |
mbed_official | 107:414e9c822e99 | 95 | MBED_ASSERT(false); |
mbed_official | 107:414e9c822e99 | 96 | break; |
mbed_official | 107:414e9c822e99 | 97 | } |
mbed_official | 107:414e9c822e99 | 98 | } |
mbed_official | 107:414e9c822e99 | 99 | |
mbed_official | 107:414e9c822e99 | 100 | void pwmout_inithw(pwmout_t* obj) |
mbed_official | 107:414e9c822e99 | 101 | { |
mbed_official | 107:414e9c822e99 | 102 | uint32_t mode = 0; |
mbed_official | 107:414e9c822e99 | 103 | /* Configure the PMC to enable the TC module. */ |
mbed_official | 107:414e9c822e99 | 104 | sysclk_enable_peripheral_clock(getpwmchannelid(obj->channel)); |
mbed_official | 107:414e9c822e99 | 105 | #if SAMG55 |
mbed_official | 107:414e9c822e99 | 106 | /* Enable PCK output */ |
mbed_official | 107:414e9c822e99 | 107 | pmc_disable_pck(PMC_PCK_3); |
mbed_official | 107:414e9c822e99 | 108 | pmc_switch_pck_to_mck(PMC_PCK_3, PMC_PCK_PRES_CLK_1); |
mbed_official | 107:414e9c822e99 | 109 | pmc_enable_pck(PMC_PCK_3); |
mbed_official | 107:414e9c822e99 | 110 | #endif |
mbed_official | 107:414e9c822e99 | 111 | switch (obj->ioline) { |
mbed_official | 107:414e9c822e99 | 112 | case 0 : |
mbed_official | 107:414e9c822e99 | 113 | mode = TC_CMR_ACPA_SET | TC_CMR_ACPC_CLEAR; /* RA Compare Effect: set */ /* RC Compare Effect: clear */ |
mbed_official | 107:414e9c822e99 | 114 | break; |
mbed_official | 107:414e9c822e99 | 115 | case 1 : |
mbed_official | 107:414e9c822e99 | 116 | mode = TC_CMR_BCPB_SET | TC_CMR_BCPC_CLEAR | TC_CMR_ABETRG; /* RB Compare Effect: set */ /* RC Compare Effect: clear */ /*Change external event selection from TIOB*/ |
mbed_official | 107:414e9c822e99 | 117 | break; |
mbed_official | 107:414e9c822e99 | 118 | default : |
mbed_official | 107:414e9c822e99 | 119 | MBED_ASSERT(false); |
mbed_official | 107:414e9c822e99 | 120 | break; |
mbed_official | 107:414e9c822e99 | 121 | } |
mbed_official | 107:414e9c822e99 | 122 | /* Disable TC TC_CHANNEL_WAVEFORM. */ |
mbed_official | 107:414e9c822e99 | 123 | tc_stop(TC, obj->channel); |
mbed_official | 107:414e9c822e99 | 124 | /* Init TC to waveform mode. */ |
mbed_official | 107:414e9c822e99 | 125 | tc_init(TC, obj->channel, |
mbed_official | 107:414e9c822e99 | 126 | /* Waveform Clock Selection */ |
mbed_official | 107:414e9c822e99 | 127 | obj->waveconfig.ul_intclock |
mbed_official | 107:414e9c822e99 | 128 | | TC_CMR_WAVE /* Waveform mode is enabled */ |
mbed_official | 107:414e9c822e99 | 129 | | TC_CMR_CPCTRG /* UP mode with automatic trigger on RC Compare */ |
mbed_official | 107:414e9c822e99 | 130 | | mode |
mbed_official | 107:414e9c822e99 | 131 | ); |
mbed_official | 107:414e9c822e99 | 132 | } |
mbed_official | 107:414e9c822e99 | 133 | |
mbed_official | 107:414e9c822e99 | 134 | /** Initialize PWM Module |
mbed_official | 107:414e9c822e99 | 135 | * |
mbed_official | 107:414e9c822e99 | 136 | * @param[in][out] obj The PWM object to initialize |
mbed_official | 107:414e9c822e99 | 137 | * @return void |
mbed_official | 107:414e9c822e99 | 138 | */ |
mbed_official | 107:414e9c822e99 | 139 | void pwmout_init(pwmout_t* obj, PinName pin) |
mbed_official | 107:414e9c822e99 | 140 | { |
mbed_official | 107:414e9c822e99 | 141 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 142 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 143 | uint32_t ioline = NC; |
mbed_official | 107:414e9c822e99 | 144 | uint32_t channel = NC; |
mbed_official | 107:414e9c822e99 | 145 | |
mbed_official | 107:414e9c822e99 | 146 | if (g_sys_init == 0) { |
mbed_official | 107:414e9c822e99 | 147 | sysclk_init(); |
mbed_official | 107:414e9c822e99 | 148 | system_board_init(); |
mbed_official | 107:414e9c822e99 | 149 | g_sys_init = 1; |
mbed_official | 107:414e9c822e99 | 150 | } |
mbed_official | 107:414e9c822e99 | 151 | if(pin != NC) { |
mbed_official | 107:414e9c822e99 | 152 | pin_function(pin, pinmap_find_function(pin, PinMap_PWM)); |
mbed_official | 107:414e9c822e99 | 153 | ioport_disable_pin(pin); |
mbed_official | 107:414e9c822e99 | 154 | } |
mbed_official | 107:414e9c822e99 | 155 | obj->pin = pin; |
mbed_official | 107:414e9c822e99 | 156 | |
mbed_official | 107:414e9c822e99 | 157 | ioline = pinmap_find_function(pin, PinMap_PWM_IO_Line); /*To find out which IO Line is associated with the pin and initialise accordingly*/ /*pinmap_find_function reused to find out iolin used*/ |
mbed_official | 107:414e9c822e99 | 158 | MBED_ASSERT(ioline != NC); |
mbed_official | 107:414e9c822e99 | 159 | obj->ioline = ioline; |
mbed_official | 107:414e9c822e99 | 160 | |
mbed_official | 107:414e9c822e99 | 161 | channel = pinmap_find_peripheral(pin, PinMap_PWM_IO_Line); /* PinMap_PWM_IO_Line contains channel number and ioline to be used*/ /*pinmap_find_peripheral function reused to find out channel number*/ |
mbed_official | 107:414e9c822e99 | 162 | MBED_ASSERT(channel != NC); |
mbed_official | 107:414e9c822e99 | 163 | obj->channel = channel; |
mbed_official | 107:414e9c822e99 | 164 | obj->waveconfig.us_frequency = 500; |
mbed_official | 107:414e9c822e99 | 165 | obj->waveconfig.us_dutycycle = 50; |
mbed_official | 107:414e9c822e99 | 166 | |
mbed_official | 107:414e9c822e99 | 167 | obj->prescalarindex = getprescalarindex(obj->waveconfig.us_frequency); |
mbed_official | 107:414e9c822e99 | 168 | obj->waveconfig.ul_intclock = tc_prescalar[obj->prescalarindex]; |
mbed_official | 107:414e9c822e99 | 169 | pwmout_inithw(obj); |
mbed_official | 107:414e9c822e99 | 170 | |
mbed_official | 107:414e9c822e99 | 171 | /*Set the registers a,b,c*/ |
mbed_official | 107:414e9c822e99 | 172 | setregisterabc(obj); |
mbed_official | 107:414e9c822e99 | 173 | |
mbed_official | 107:414e9c822e99 | 174 | /* Enable TC TC_CHANNEL_WAVEFORM. */ |
mbed_official | 107:414e9c822e99 | 175 | tc_start(TC, channel); |
mbed_official | 107:414e9c822e99 | 176 | } |
mbed_official | 107:414e9c822e99 | 177 | |
mbed_official | 107:414e9c822e99 | 178 | /** Free the PWM Module |
mbed_official | 107:414e9c822e99 | 179 | * |
mbed_official | 107:414e9c822e99 | 180 | * @param[in] obj The PWM object to free |
mbed_official | 107:414e9c822e99 | 181 | * @return void |
mbed_official | 107:414e9c822e99 | 182 | */ |
mbed_official | 107:414e9c822e99 | 183 | void pwmout_free(pwmout_t* obj) |
mbed_official | 107:414e9c822e99 | 184 | { |
mbed_official | 107:414e9c822e99 | 185 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 186 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 187 | tc_stop(TC, obj->channel); |
mbed_official | 107:414e9c822e99 | 188 | } |
mbed_official | 107:414e9c822e99 | 189 | |
mbed_official | 107:414e9c822e99 | 190 | /** Set the duty cycle of PWM Waveform |
mbed_official | 107:414e9c822e99 | 191 | * |
mbed_official | 107:414e9c822e99 | 192 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 193 | * @param[in] value New duty cycle to be set |
mbed_official | 107:414e9c822e99 | 194 | * @return void |
mbed_official | 107:414e9c822e99 | 195 | */ |
mbed_official | 107:414e9c822e99 | 196 | void pwmout_write(pwmout_t* obj, float value) |
mbed_official | 107:414e9c822e99 | 197 | { |
mbed_official | 107:414e9c822e99 | 198 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 199 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 200 | if (value < 0.0f) { |
mbed_official | 107:414e9c822e99 | 201 | value = 0; |
mbed_official | 107:414e9c822e99 | 202 | } else if (value > 1.0f) { |
mbed_official | 107:414e9c822e99 | 203 | value = 1; |
mbed_official | 107:414e9c822e99 | 204 | } |
mbed_official | 107:414e9c822e99 | 205 | obj->waveconfig.us_dutycycle = (uint16_t)(value * 100); |
mbed_official | 107:414e9c822e99 | 206 | tc_stop(TC, obj->channel); |
mbed_official | 107:414e9c822e99 | 207 | |
mbed_official | 107:414e9c822e99 | 208 | /*Set the registers a,b,c*/ |
mbed_official | 107:414e9c822e99 | 209 | setregisterabc(obj); |
mbed_official | 107:414e9c822e99 | 210 | |
mbed_official | 107:414e9c822e99 | 211 | /* Enable TC TC_CHANNEL_WAVEFORM. */ |
mbed_official | 107:414e9c822e99 | 212 | tc_start(TC, obj->channel); |
mbed_official | 107:414e9c822e99 | 213 | } |
mbed_official | 107:414e9c822e99 | 214 | |
mbed_official | 107:414e9c822e99 | 215 | /** Get the duty cycle of PWM Waveform |
mbed_official | 107:414e9c822e99 | 216 | * |
mbed_official | 107:414e9c822e99 | 217 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 218 | * @return Current duty cycle |
mbed_official | 107:414e9c822e99 | 219 | */ |
mbed_official | 107:414e9c822e99 | 220 | float pwmout_read(pwmout_t* obj) |
mbed_official | 107:414e9c822e99 | 221 | { |
mbed_official | 107:414e9c822e99 | 222 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 223 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 224 | return (obj->waveconfig.us_dutycycle / 100.0); |
mbed_official | 107:414e9c822e99 | 225 | } |
mbed_official | 107:414e9c822e99 | 226 | |
mbed_official | 107:414e9c822e99 | 227 | /** Set the period of PWM Waveform |
mbed_official | 107:414e9c822e99 | 228 | * |
mbed_official | 107:414e9c822e99 | 229 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 230 | * @param[in] seconds New period in seconds |
mbed_official | 107:414e9c822e99 | 231 | * @return void |
mbed_official | 107:414e9c822e99 | 232 | */ |
mbed_official | 107:414e9c822e99 | 233 | void pwmout_period(pwmout_t* obj, float seconds) |
mbed_official | 107:414e9c822e99 | 234 | { |
mbed_official | 107:414e9c822e99 | 235 | pwmout_period_us(obj, seconds * 1000000.0f); |
mbed_official | 107:414e9c822e99 | 236 | } |
mbed_official | 107:414e9c822e99 | 237 | |
mbed_official | 107:414e9c822e99 | 238 | /** Set the period of PWM Waveform |
mbed_official | 107:414e9c822e99 | 239 | * |
mbed_official | 107:414e9c822e99 | 240 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 241 | * @param[in] value New period in milliseconds |
mbed_official | 107:414e9c822e99 | 242 | * @return void |
mbed_official | 107:414e9c822e99 | 243 | */ |
mbed_official | 107:414e9c822e99 | 244 | void pwmout_period_ms(pwmout_t* obj, int ms) |
mbed_official | 107:414e9c822e99 | 245 | { |
mbed_official | 107:414e9c822e99 | 246 | pwmout_period_us(obj, ms * 1000); |
mbed_official | 107:414e9c822e99 | 247 | } |
mbed_official | 107:414e9c822e99 | 248 | |
mbed_official | 107:414e9c822e99 | 249 | /** Set the period of PWM Waveform |
mbed_official | 107:414e9c822e99 | 250 | * |
mbed_official | 107:414e9c822e99 | 251 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 252 | * @param[in] us New period in microseconds |
mbed_official | 107:414e9c822e99 | 253 | * @return void |
mbed_official | 107:414e9c822e99 | 254 | */ |
mbed_official | 107:414e9c822e99 | 255 | void pwmout_period_us(pwmout_t* obj, int us) |
mbed_official | 107:414e9c822e99 | 256 | { |
mbed_official | 107:414e9c822e99 | 257 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 258 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 259 | float freq = ( 1.0 / us ) * 1000000.0; |
mbed_official | 107:414e9c822e99 | 260 | |
mbed_official | 107:414e9c822e99 | 261 | obj->waveconfig.us_frequency = (uint16_t) freq; |
mbed_official | 107:414e9c822e99 | 262 | obj->prescalarindex = getprescalarindex(obj->waveconfig.us_frequency); |
mbed_official | 107:414e9c822e99 | 263 | obj->waveconfig.ul_intclock = tc_prescalar[obj->prescalarindex]; |
mbed_official | 107:414e9c822e99 | 264 | pwmout_inithw(obj); |
mbed_official | 107:414e9c822e99 | 265 | |
mbed_official | 107:414e9c822e99 | 266 | /*Set the registers a,b,c*/ |
mbed_official | 107:414e9c822e99 | 267 | setregisterabc(obj); |
mbed_official | 107:414e9c822e99 | 268 | |
mbed_official | 107:414e9c822e99 | 269 | /* Enable TC TC_CHANNEL_WAVEFORM. */ |
mbed_official | 107:414e9c822e99 | 270 | tc_start(TC, obj->channel); |
mbed_official | 107:414e9c822e99 | 271 | } |
mbed_official | 107:414e9c822e99 | 272 | |
mbed_official | 107:414e9c822e99 | 273 | /** Set the pulse width of PWM Waveform |
mbed_official | 107:414e9c822e99 | 274 | * |
mbed_official | 107:414e9c822e99 | 275 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 276 | * @param[in] seconds New pulse width in seconds |
mbed_official | 107:414e9c822e99 | 277 | * @return void |
mbed_official | 107:414e9c822e99 | 278 | */ |
mbed_official | 107:414e9c822e99 | 279 | void pwmout_pulsewidth(pwmout_t* obj, float seconds) |
mbed_official | 107:414e9c822e99 | 280 | { |
mbed_official | 107:414e9c822e99 | 281 | pwmout_pulsewidth_us(obj, seconds * 1000000.0f); |
mbed_official | 107:414e9c822e99 | 282 | } |
mbed_official | 107:414e9c822e99 | 283 | |
mbed_official | 107:414e9c822e99 | 284 | /** Set the pulse width of PWM Waveform |
mbed_official | 107:414e9c822e99 | 285 | * |
mbed_official | 107:414e9c822e99 | 286 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 287 | * @param[in] ms New pulse width in milliseconds |
mbed_official | 107:414e9c822e99 | 288 | * @return void |
mbed_official | 107:414e9c822e99 | 289 | */ |
mbed_official | 107:414e9c822e99 | 290 | void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) |
mbed_official | 107:414e9c822e99 | 291 | { |
mbed_official | 107:414e9c822e99 | 292 | pwmout_pulsewidth_us(obj, ms * 1000); |
mbed_official | 107:414e9c822e99 | 293 | } |
mbed_official | 107:414e9c822e99 | 294 | |
mbed_official | 107:414e9c822e99 | 295 | /** Set the pulse width of PWM Waveform |
mbed_official | 107:414e9c822e99 | 296 | * |
mbed_official | 107:414e9c822e99 | 297 | * @param[in] obj The PWM object |
mbed_official | 107:414e9c822e99 | 298 | * @param[in] us New pulse width in microseconds |
mbed_official | 107:414e9c822e99 | 299 | * @return void |
mbed_official | 107:414e9c822e99 | 300 | */ |
mbed_official | 107:414e9c822e99 | 301 | void pwmout_pulsewidth_us(pwmout_t* obj, int us) |
mbed_official | 107:414e9c822e99 | 302 | { |
mbed_official | 107:414e9c822e99 | 303 | /* Sanity check arguments */ |
mbed_official | 107:414e9c822e99 | 304 | MBED_ASSERT(obj); |
mbed_official | 107:414e9c822e99 | 305 | float new_duty = (us / 1000000.0) * (float)obj->waveconfig.us_frequency; |
mbed_official | 107:414e9c822e99 | 306 | pwmout_write(obj, new_duty); |
mbed_official | 107:414e9c822e99 | 307 | } |